# -*- coding: UTF-8 -*- """ Created on Sun Dec 27 20:43:40 2020 @author: DJ2LS """ # pylint: disable=invalid-name, line-too-long, c-extension-no-member # pylint: disable=import-outside-toplevel, attribute-defined-outside-init # pylint: disable=fixme import os import base64 import sys import threading import time import uuid import lzma from random import randrange import hmac import hashlib import codec2 import helpers import modem import numpy as np import sock from static import ARQ, AudioParam, Beacon, Channel, Daemon, HamlibParam, ModemParam, Station, Statistics, TCIParam, TNC import structlog import stats import ujson as json from codec2 import FREEDV_MODE, FREEDV_MODE_USED_SLOTS from queues import DATA_QUEUE_RECEIVED, DATA_QUEUE_TRANSMIT, RX_BUFFER, MESH_RECEIVED_QUEUE from static import FRAME_TYPE as FR_TYPE import broadcast TESTMODE = False class DATA: """Terminal Node Controller for FreeDATA""" log = structlog.get_logger("DATA") def __init__(self) -> None: self.stats = stats.stats() # Initial call sign. Will be overwritten later self.mycallsign = Station.mycallsign self.dxcallsign = Station.dxcallsign self.data_queue_transmit = DATA_QUEUE_TRANSMIT self.data_queue_received = DATA_QUEUE_RECEIVED # length of signalling frame self.length_sig0_frame = 14 self.length_sig1_frame = 14 # duration of signalling frame self.duration_sig0_frame = 2.3 self.duration_sig1_frame = 2.3 self.longest_duration = 5.8 # datac5 # hold session id self.session_id = bytes(1) # ------- ARQ SESSION self.arq_file_transfer = False self.IS_ARQ_SESSION_MASTER = False self.arq_session_last_received = 0 self.arq_session_timeout = 30 self.session_connect_max_retries = 15 self.irs_buffer_position = 0 # actual n retries of burst self.tx_n_retry_of_burst = 0 self.transmission_uuid = "" self.burst_last_received = 0.0 # time of last "live sign" of a burst self.data_channel_last_received = 0.0 # time of last "live sign" of a frame self.burst_ack_snr = 0 # SNR from received burst ack frames # Flag to indicate if we received an ACK frame for a burst self.burst_ack = False # Flag to indicate if we received an ACK frame for a data frame self.data_frame_ack_received = False # Flag to indicate if we received a request for repeater frames self.rpt_request_received = False self.rpt_request_buffer = [] # requested frames, saved in a list self.burst_rpt_counter = 0 self.rx_start_of_transmission = 0 # time of transmission start # 3 bytes for the BOF Beginning of File indicator in a data frame self.data_frame_bof = b"BOF" # 3 bytes for the EOF End of File indicator in a data frame self.data_frame_eof = b"EOF" self.tx_n_max_retries_per_burst = 40 self.rx_n_max_retries_per_burst = 40 self.n_retries_per_burst = 0 self.rx_n_frame_of_burst = 0 self.rx_n_frames_per_burst = 0 self.max_n_frames_per_burst = 1 self.broadcast = broadcast.broadcastHandler() # Flag to indicate if we received a low bandwidth mode channel opener self.received_LOW_BANDWIDTH_MODE = False self.data_channel_max_retries = 15 self.datachannel_timeout = False # -------------- AVAILABLE MODES START----------- # IMPORTANT: LISTS MUST BE OF EQUAL LENGTH # --------------------- LOW BANDWIDTH # List of codec2 modes to use in "low bandwidth" mode. self.mode_list_low_bw = [ FREEDV_MODE.datac4.value, ] # List for minimum SNR operating level for the corresponding mode in self.mode_list self.snr_list_low_bw = [-100] # List for time to wait for corresponding mode in seconds self.time_list_low_bw = [6 + self.duration_sig0_frame + 1] # --------------------- HIGH BANDWIDTH # List of codec2 modes to use in "high bandwidth" mode. self.mode_list_high_bw = [ FREEDV_MODE.datac4.value, FREEDV_MODE.datac3.value, FREEDV_MODE.datac1.value, ] # List for minimum SNR operating level for the corresponding mode in self.mode_list self.snr_list_high_bw = [-100, 0, 3] # List for time to wait for corresponding mode in seconds # test with 6,7 --> caused sometimes a frame timeout if ack frame takes longer # TODO: Need to check why ACK frames needs more time # TODO: Adjust these times self.time_list_high_bw = [6 + self.duration_sig0_frame + 1, 6 + self.duration_sig0_frame + 1, 6 + self.duration_sig0_frame + 1] # -------------- AVAILABLE MODES END----------- # Mode list for selecting between low bandwidth ( 500Hz ) and modes with higher bandwidth # but ability to fall back to low bandwidth modes if needed. if TNC.low_bandwidth_mode: # List of codec2 modes to use in "low bandwidth" mode. self.mode_list = self.mode_list_low_bw # list of times to wait for corresponding mode in seconds self.time_list = self.time_list_low_bw else: # List of codec2 modes to use in "high bandwidth" mode. self.mode_list = self.mode_list_high_bw # list of times to wait for corresponding mode in seconds self.time_list = self.time_list_high_bw self.speed_level = len(self.mode_list) - 1 # speed level for selecting mode ARQ.arq_speed_level = self.speed_level # minimum payload for arq burst # import for avoiding byteorder bug and buffer search area self.arq_burst_header_size = 3 self.arq_burst_minimum_payload = 56 - self.arq_burst_header_size self.arq_burst_maximum_payload = 510 - self.arq_burst_header_size # save last used payload for optimising buffer search area self.arq_burst_last_payload = self.arq_burst_maximum_payload self.is_IRS = False self.burst_nack = False self.burst_nack_counter = 0 self.frame_nack_counter = 0 self.frame_received_counter = 0 self.rx_frame_bof_received = False self.rx_frame_eof_received = False # TIMEOUTS self.burst_ack_timeout_seconds = 4.5 # timeout for burst acknowledges self.data_frame_ack_timeout_seconds = 4.5 # timeout for data frame acknowledges self.rpt_ack_timeout_seconds = 4.5 # timeout for rpt frame acknowledges self.transmission_timeout = 180 # transmission timeout in seconds # Dictionary of functions and log messages used in process_data # instead of a long series of if-elif-else statements. self.rx_dispatcher = { FR_TYPE.ARQ_DC_OPEN_ACK_N.value: ( self.arq_received_channel_is_open, "ARQ OPEN ACK (Narrow)", ), FR_TYPE.ARQ_DC_OPEN_ACK_W.value: ( self.arq_received_channel_is_open, "ARQ OPEN ACK (Wide)", ), FR_TYPE.ARQ_DC_OPEN_N.value: ( self.arq_received_data_channel_opener, "ARQ Data Channel Open (Narrow)", ), FR_TYPE.ARQ_DC_OPEN_W.value: ( self.arq_received_data_channel_opener, "ARQ Data Channel Open (Wide)", ), FR_TYPE.ARQ_SESSION_CLOSE.value: ( self.received_session_close, "ARQ CLOSE SESSION", ), FR_TYPE.ARQ_SESSION_HB.value: ( self.received_session_heartbeat, "ARQ HEARTBEAT", ), FR_TYPE.ARQ_SESSION_OPEN.value: ( self.received_session_opener, "ARQ OPEN SESSION", ), FR_TYPE.ARQ_STOP.value: (self.received_stop_transmission, "ARQ STOP TX"), FR_TYPE.BEACON.value: (self.received_beacon, "BEACON"), FR_TYPE.BURST_ACK.value: (self.burst_ack_nack_received, "BURST ACK"), FR_TYPE.BURST_NACK.value: (self.burst_ack_nack_received, "BURST NACK"), FR_TYPE.CQ.value: (self.received_cq, "CQ"), FR_TYPE.FR_ACK.value: (self.frame_ack_received, "FRAME ACK"), FR_TYPE.FR_NACK.value: (self.frame_nack_received, "FRAME NACK"), FR_TYPE.FR_REPEAT.value: (self.burst_rpt_received, "REPEAT REQUEST"), FR_TYPE.PING_ACK.value: (self.received_ping_ack, "PING ACK"), FR_TYPE.PING.value: (self.received_ping, "PING"), FR_TYPE.QRV.value: (self.received_qrv, "QRV"), FR_TYPE.IS_WRITING.value: (self.received_is_writing, "IS_WRITING"), FR_TYPE.FEC.value: (self.broadcast.received_fec, "FEC"), FR_TYPE.FEC_WAKEUP.value: (self.broadcast.received_fec_wakeup, "FEC WAKEUP"), } self.command_dispatcher = { # "CONNECT": (self.arq_session_handler, "CONNECT"), "CQ": (self.transmit_cq, "CQ"), "DISCONNECT": (self.close_session, "DISCONNECT"), "SEND_TEST_FRAME": (self.send_test_frame, "TEST"), "STOP": (self.stop_transmission, "STOP"), } # Start worker and watchdog threads worker_thread_transmit = threading.Thread( target=self.worker_transmit, name="worker thread transmit", daemon=True ) worker_thread_transmit.start() worker_thread_receive = threading.Thread( target=self.worker_receive, name="worker thread receive", daemon=True ) worker_thread_receive.start() # START THE THREAD FOR THE TIMEOUT WATCHDOG watchdog_thread = threading.Thread( target=self.watchdog, name="watchdog", daemon=True ) watchdog_thread.start() arq_session_thread = threading.Thread( target=self.heartbeat, name="watchdog", daemon=True ) arq_session_thread.start() self.beacon_interval = 0 self.beacon_interval_timer = 0 self.beacon_thread = threading.Thread( target=self.run_beacon, name="watchdog", daemon=True ) self.beacon_thread.start() def worker_transmit(self) -> None: """Dispatch incoming UI instructions for transmitting operations""" while True: data = self.data_queue_transmit.get() # if we are already in ARQ_STATE, or we're receiving codec2 traffic # let's wait with processing data # this should avoid weird toggle states where both stations # stuck in IRS # # send transmission queued information once if ARQ.arq_state or ModemParam.is_codec2_traffic: self.log.debug( "[TNC] TX DISPATCHER - waiting with processing command ", arq_state=ARQ.arq_state, ) self.send_data_to_socket_queue( freedata="tnc-message", command=data[0], status="queued", ) # now stay in while loop until state released while ARQ.arq_state or ModemParam.is_codec2_traffic: threading.Event().wait(0.01) # and finally sleep some time threading.Event().wait(1.0) # Dispatch commands known to command_dispatcher if data[0] in self.command_dispatcher: self.log.debug(f"[TNC] TX {self.command_dispatcher[data[0]][1]}...") self.command_dispatcher[data[0]][0]() # Dispatch commands that need more arguments. elif data[0] == "CONNECT": # [1] mycallsign # [2] dxcallsign # [3] attempts self.arq_session_handler(data[1], data[2], data[3]) elif data[0] == "PING": # [1] mycallsign # [2] dxcallsign self.transmit_ping(data[1], data[2]) elif data[0] == "BEACON": # [1] INTERVAL int # [2] STATE bool if data[2]: self.beacon_interval = data[1] Beacon.beacon_state = True else: Beacon.beacon_state = False elif data[0] == "ARQ_RAW": # [1] DATA_OUT bytes # [2] self.transmission_uuid str # [3] mycallsign with ssid # [4] dxcallsign with ssid # [5] attempts # [6] hmac salt hash self.open_dc_and_transmit(data[1], data[2], data[3], data[4], data[5], data[6]) elif data[0] == "FEC_IS_WRITING": # [1] DATA_OUT bytes # [2] MODE str datac0/1/3... self.send_fec_is_writing(data[1]) elif data[0] == "FEC": # [1] WAKEUP bool # [2] MODE str datac0/1/3... # [3] PAYLOAD # [4] MYCALLSIGN self.send_fec(data[1], data[2], data[3], data[4]) else: self.log.error( "[TNC] worker_transmit: received invalid command:", data=data ) def worker_receive(self) -> None: """Queue received data for processing""" while True: data = self.data_queue_received.get() # [0] bytes # [1] freedv instance # [2] bytes_per_frame self.process_data( bytes_out=data[0], freedv=data[1], bytes_per_frame=data[2] ) def process_data(self, bytes_out, freedv, bytes_per_frame: int) -> None: """ Process incoming data and decide what to do with the frame. Args: bytes_out: freedv: bytes_per_frame: Returns: """ self.log.debug( "[TNC] process_data:", n_retries_per_burst=self.n_retries_per_burst ) # Process data only if broadcast or we are the receiver # bytes_out[1:4] == callsign check for signalling frames, # bytes_out[2:5] == transmission # we could also create an own function, which returns True. frametype = int.from_bytes(bytes(bytes_out[:1]), "big") # check for callsign CRC _valid1, _ = helpers.check_callsign(self.mycallsign, bytes(bytes_out[1:4])) _valid2, _ = helpers.check_callsign(self.mycallsign, bytes(bytes_out[2:5])) # check for session ID # signalling frames _valid3 = helpers.check_session_id(self.session_id, bytes(bytes_out[1:2])) # arq data frames _valid4 = helpers.check_session_id(self.session_id, bytes(bytes_out[2:3])) if ( _valid1 or _valid2 or _valid3 or _valid4 or frametype in [ FR_TYPE.CQ.value, FR_TYPE.QRV.value, FR_TYPE.PING.value, FR_TYPE.BEACON.value, FR_TYPE.IS_WRITING.value, FR_TYPE.FEC.value, FR_TYPE.FEC_WAKEUP.value, ] ): # CHECK IF FRAMETYPE IS BETWEEN 10 and 50 ------------------------ # frame = frametype - 10 # n_frames_per_burst = int.from_bytes(bytes(bytes_out[1:2]), "big") # Dispatch activity based on received frametype if frametype in self.rx_dispatcher: # Process frames "known" by rx_dispatcher # self.log.debug(f"[TNC] {self.rx_dispatcher[frametype][1]} RECEIVED....") self.rx_dispatcher[frametype][0](bytes_out[:-2]) # Process frametypes requiring a different set of arguments. elif FR_TYPE.BURST_51.value >= frametype >= FR_TYPE.BURST_01.value: # get snr of received data # FIXME: find a fix for this - after moving to classes, this no longer works # snr = self.calculate_snr(freedv) snr = ModemParam.snr self.log.debug("[TNC] RX SNR", snr=snr) # send payload data to arq checker without CRC16 self.arq_data_received( bytes(bytes_out[:-2]), bytes_per_frame, snr, freedv ) # if we received the last frame of a burst or the last remaining rpt frame, do a modem unsync # if ARQ.rx_burst_buffer.count(None) <= 1 or (frame+1) == n_frames_per_burst: # self.log.debug(f"[TNC] LAST FRAME OF BURST --> UNSYNC {frame+1}/{n_frames_per_burst}") # self.c_lib.freedv_set_sync(freedv, 0) # TESTFRAMES elif frametype == FR_TYPE.TEST_FRAME.value: self.log.debug("[TNC] TESTFRAME RECEIVED", frame=bytes_out[:]) # Unknown frame type else: self.log.warning( "[TNC] ARQ - other frame type", frametype=FR_TYPE(frametype).name ) else: # for debugging purposes to receive all data self.log.debug( "[TNC] Foreign frame received", frame=bytes_out[:-2].hex(), frame_type=FR_TYPE(int.from_bytes(bytes_out[:1], byteorder="big")).name, ) def enqueue_frame_for_tx( self, frame_to_tx, # : list[bytearray], # this causes a crash on python 3.7 c2_mode=FREEDV_MODE.sig0.value, copies=1, repeat_delay=0, ) -> None: """ Send (transmit) supplied frame to TNC :param frame_to_tx: Frame data to send :type frame_to_tx: list of bytearrays :param c2_mode: Codec2 mode to use, defaults to datac13 :type c2_mode: int, optional :param copies: Number of frame copies to send, defaults to 1 :type copies: int, optional :param repeat_delay: Delay time before sending repeat frame, defaults to 0 :type repeat_delay: int, optional """ #print(frame_to_tx[0]) #print(frame_to_tx) frame_type = FR_TYPE(int.from_bytes(frame_to_tx[0][:1], byteorder="big")).name self.log.debug("[TNC] enqueue_frame_for_tx", c2_mode=FREEDV_MODE(c2_mode).name, data=frame_to_tx, type=frame_type) # Set the TRANSMITTING flag before adding an object to the transmit queue # TODO: This is not that nice, we could improve this somehow TNC.transmitting = True modem.MODEM_TRANSMIT_QUEUE.put([c2_mode, copies, repeat_delay, frame_to_tx]) # Wait while transmitting while TNC.transmitting: threading.Event().wait(0.01) def send_data_to_socket_queue(self, **jsondata): """ Send information to the UI via JSON and the sock.SOCKET_QUEUE. Args: Dictionary containing the data to be sent, in the format: key=value, for each item. E.g.: self.send_data_to_socket_queue( freedata="tnc-message", arq="received", status="success", uuid=self.transmission_uuid, timestamp=timestamp, mycallsign=str(self.mycallsign, "UTF-8"), dxcallsign=str(Station.dxcallsign, "UTF-8"), dxgrid=str(Station.dxgrid, "UTF-8"), data=base64_data, ) """ # add mycallsign and dxcallsign to network message if they not exist # and make sure we are not overwrite them if they exist try: if "mycallsign" not in jsondata: jsondata["mycallsign"] = str(self.mycallsign, "UTF-8") if "dxcallsign" not in jsondata: jsondata["dxcallsign"] = str(Station.dxcallsign, "UTF-8") except Exception as e: self.log.debug("[TNC] error adding callsigns to network message", e=e) # run json dumps json_data_out = json.dumps(jsondata) self.log.debug("[TNC] send_data_to_socket_queue:", jsondata=json_data_out) # finally push data to our network queue sock.SOCKET_QUEUE.put(json_data_out) def send_ident_frame(self, transmit) -> None: """Build and send IDENT frame """ ident_frame = bytearray(self.length_sig1_frame) ident_frame[:1] = bytes([FR_TYPE.IDENT.value]) ident_frame[1:self.length_sig1_frame] = self.mycallsign # Transmit frame if transmit: self.enqueue_frame_for_tx([ident_frame], c2_mode=FREEDV_MODE.sig0.value) else: return ident_frame def send_burst_ack_frame(self, snr) -> None: """Build and send ACK frame for burst DATA frame""" ack_frame = bytearray(self.length_sig1_frame) ack_frame[:1] = bytes([FR_TYPE.BURST_ACK.value]) ack_frame[1:2] = self.session_id ack_frame[2:3] = helpers.snr_to_bytes(snr) ack_frame[3:4] = bytes([int(self.speed_level)]) ack_frame[4:8] = len(ARQ.rx_frame_buffer).to_bytes(4, byteorder="big") # wait while timeout not reached and our busy state is busy channel_busy_timeout = time.time() + 5 while ModemParam.channel_busy and time.time() < channel_busy_timeout and not self.check_if_mode_fits_to_busy_slot(): threading.Event().wait(0.01) # Transmit frame self.enqueue_frame_for_tx([ack_frame], c2_mode=FREEDV_MODE.sig1.value) def send_data_ack_frame(self, snr) -> None: """Build and send ACK frame for received DATA frame""" ack_frame = bytearray(self.length_sig1_frame) ack_frame[:1] = bytes([FR_TYPE.FR_ACK.value]) ack_frame[1:2] = self.session_id ack_frame[2:3] = helpers.snr_to_bytes(snr) # wait while timeout not reached and our busy state is busy channel_busy_timeout = time.time() + 5 while ModemParam.channel_busy and time.time() < channel_busy_timeout and not self.check_if_mode_fits_to_busy_slot(): threading.Event().wait(0.01) # reset burst timeout in case we had to wait too long self.burst_last_received = time.time() + channel_busy_timeout + 8 # Transmit frame # TODO: Do we have to send , self.send_ident_frame(False) ? # self.enqueue_frame_for_tx([ack_frame, self.send_ident_frame(False)], c2_mode=FREEDV_MODE.sig1.value, copies=3, repeat_delay=0) self.enqueue_frame_for_tx([ack_frame], c2_mode=FREEDV_MODE.sig1.value, copies=3, repeat_delay=0) def send_retransmit_request_frame(self) -> None: # check where a None is in our burst buffer and do frame+1, because lists start at 0 # FIXME: Check to see if there's a `frame - 1` in the receive portion. Remove both if there is. #print(ARQ.rx_burst_buffer) missing_frames = [ frame + 1 for frame, element in enumerate(ARQ.rx_burst_buffer) if element is None ] rpt_frame = bytearray(self.length_sig1_frame) rpt_frame[:1] = bytes([FR_TYPE.FR_REPEAT.value]) rpt_frame[1:2] = self.session_id rpt_frame[2:2 + len(missing_frames)] = missing_frames self.log.info("[TNC] ARQ | RX | Requesting", frames=missing_frames) # Transmit frame self.enqueue_frame_for_tx([rpt_frame], c2_mode=FREEDV_MODE.sig1.value, copies=1, repeat_delay=0) def send_burst_nack_frame(self, snr: bytes) -> None: """Build and send NACK frame for received DATA frame""" nack_frame = bytearray(self.length_sig1_frame) nack_frame[:1] = bytes([FR_TYPE.FR_NACK.value]) nack_frame[1:2] = self.session_id nack_frame[2:3] = helpers.snr_to_bytes(snr) nack_frame[3:4] = bytes([int(self.speed_level)]) nack_frame[4:8] = len(ARQ.rx_frame_buffer).to_bytes(4, byteorder="big") # TRANSMIT NACK FRAME FOR BURST # TODO: Do we have to send ident frame? # self.enqueue_frame_for_tx([ack_frame, self.send_ident_frame(False)], c2_mode=FREEDV_MODE.sig1.value, copies=3, repeat_delay=0) # wait while timeout not reached and our busy state is busy channel_busy_timeout = time.time() + 5 while ModemParam.channel_busy and time.time() < channel_busy_timeout and not self.check_if_mode_fits_to_busy_slot(): threading.Event().wait(0.01) self.enqueue_frame_for_tx([nack_frame], c2_mode=FREEDV_MODE.sig1.value, copies=3, repeat_delay=0) # reset burst timeout in case we had to wait too long self.burst_last_received = time.time() def send_burst_nack_frame_watchdog(self, snr: bytes, tx_n_frames_per_burst) -> None: """Build and send NACK frame for watchdog timeout""" # increment nack counter for transmission stats self.frame_nack_counter += 1 # we need to clear our rx burst buffer ARQ.rx_burst_buffer = [] # Create and send ACK frame self.log.info("[TNC] ARQ | RX | SENDING NACK") nack_frame = bytearray(self.length_sig1_frame) nack_frame[:1] = bytes([FR_TYPE.BURST_NACK.value]) nack_frame[1:2] = self.session_id nack_frame[2:3] = helpers.snr_to_bytes(snr) nack_frame[3:4] = bytes([int(self.speed_level)]) nack_frame[4:5] = bytes([int(tx_n_frames_per_burst)]) nack_frame[5:9] = len(ARQ.rx_frame_buffer).to_bytes(4, byteorder="big") # wait while timeout not reached and our busy state is busy channel_busy_timeout = time.time() + 5 + 5 while ModemParam.channel_busy and time.time() < channel_busy_timeout and not self.check_if_mode_fits_to_busy_slot(): threading.Event().wait(0.01) # TRANSMIT NACK FRAME FOR BURST self.enqueue_frame_for_tx([nack_frame], c2_mode=FREEDV_MODE.sig1.value, copies=1, repeat_delay=0) # reset frame counter for not increasing speed level self.frame_received_counter = 0 def send_disconnect_frame(self) -> None: """Build and send a disconnect frame""" disconnection_frame = bytearray(self.length_sig1_frame) disconnection_frame[:1] = bytes([FR_TYPE.ARQ_SESSION_CLOSE.value]) disconnection_frame[1:2] = self.session_id disconnection_frame[2:5] = Station.dxcallsign_crc # TODO: Needed? disconnection_frame[7:13] = helpers.callsign_to_bytes(self.mycallsign) # self.enqueue_frame_for_tx([disconnection_frame, self.send_ident_frame(False)], c2_mode=FREEDV_MODE.sig0.value, copies=5, repeat_delay=0) # TODO: We need to add the ident frame feature with a seperate PR after publishing latest protocol # TODO: We need to wait some time between last arq related signalling frame and ident frame # TODO: Maybe about 500ms - 1500ms to avoid confusion and too much PTT toggles # wait while timeout not reached and our busy state is busy channel_busy_timeout = time.time() + 5 while ModemParam.channel_busy and time.time() < channel_busy_timeout and not self.check_if_mode_fits_to_busy_slot(): threading.Event().wait(0.01) self.enqueue_frame_for_tx([disconnection_frame], c2_mode=FREEDV_MODE.sig0.value, copies=3, repeat_delay=0) def arq_data_received( self, data_in: bytes, bytes_per_frame: int, snr: float, freedv ) -> None: """ Args: data_in:bytes: bytes_per_frame:int: snr:float: freedv: Returns: """ # We've arrived here from process_data which already checked that the frame # is intended for this station. data_in = bytes(data_in) # only process data if we are in ARQ and BUSY state else return to quit if not ARQ.arq_state and TNC.tnc_state not in ["BUSY"]: self.log.warning("[TNC] wrong tnc state - dropping data", arq_state=ARQ.arq_state, tnc_state=TNC.tnc_state) return self.arq_file_transfer = True TNC.tnc_state = "BUSY" ARQ.arq_state = True # Update data_channel timestamp self.data_channel_last_received = int(time.time()) self.burst_last_received = int(time.time()) # Extract some important data from the frame # Get sequence number of burst frame self.rx_n_frame_of_burst = int.from_bytes(bytes(data_in[:1]), "big") - 10 # Get number of bursts from received frame self.rx_n_frames_per_burst = int.from_bytes(bytes(data_in[1:2]), "big") # The RX burst buffer needs to have a fixed length filled with "None". # We need this later for counting the "Nones" to detect missing data. # Check if burst buffer has expected length else create it if len(ARQ.rx_burst_buffer) != self.rx_n_frames_per_burst: ARQ.rx_burst_buffer = [None] * self.rx_n_frames_per_burst # Append data to rx burst buffer ARQ.rx_burst_buffer[self.rx_n_frame_of_burst] = data_in[self.arq_burst_header_size:] # type: ignore Station.dxgrid = b'------' helpers.add_to_heard_stations( Station.dxcallsign, Station.dxgrid, "DATA", snr, ModemParam.frequency_offset, HamlibParam.hamlib_frequency, ) # Check if we received all frames in the burst by checking if burst buffer has no more "Nones" # This is the ideal case because we received all data if None not in ARQ.rx_burst_buffer: # then iterate through burst buffer and stick the burst together # the temp burst buffer is needed for checking, if we already received data temp_burst_buffer = b"" for value in ARQ.rx_burst_buffer: # ARQ.rx_frame_buffer += ARQ.rx_burst_buffer[i] temp_burst_buffer += bytes(value) # type: ignore # free up burst buffer ARQ.rx_burst_buffer = [] # TODO: Needs to be removed as soon as mode error is fixed # catch possible modem error which leads into false byteorder # modem possibly decodes too late - data then is pushed to buffer # which leads into wrong byteorder # Lets put this in try/except so we are not crashing tnc as its highly experimental # This might only work for datac1 and datac3 try: # area_of_interest = (modem.get_bytes_per_frame(self.mode_list[speed_level] - 1) -3) * 2 if ARQ.rx_frame_buffer.endswith(temp_burst_buffer[:246]) and len(temp_burst_buffer) >= 246: self.log.warning( "[TNC] ARQ | RX | wrong byteorder received - dropping data" ) # we need to run a return here, so we are not sending an ACK # return except Exception as e: self.log.warning( "[TNC] ARQ | RX | wrong byteorder check failed", e=e ) self.log.debug("[TNC] temp_burst_buffer", buffer=temp_burst_buffer) self.log.debug("[TNC] ARQ.rx_frame_buffer", buffer=ARQ.rx_frame_buffer) # if frame buffer ends not with the current frame, we are going to append new data # if data already exists, we received the frame correctly, # but the ACK frame didn't receive its destination (ISS) if ARQ.rx_frame_buffer.endswith(temp_burst_buffer): self.log.info( "[TNC] ARQ | RX | Frame already received - sending ACK again" ) else: # Here we are going to search for our data in the last received bytes. # This reduces the chance we will lose the entire frame in the case of signalling frame loss # ARQ.rx_frame_buffer --> existing data # temp_burst_buffer --> new data # search_area --> area where we want to search search_area = self.arq_burst_last_payload * self.rx_n_frames_per_burst search_position = len(ARQ.rx_frame_buffer) - search_area # if search position < 0, then search position = 0 search_position = max(0, search_position) # find position of data. returns -1 if nothing found in area else >= 0 # we are beginning from the end, so if data exists twice or more, # only the last one should be replaced # we are going to only check position against minimum data frame payload # use case: receive data, which already contains received data # while the payload of data received before is shorter than actual payload get_position = ARQ.rx_frame_buffer[search_position:].rfind( temp_burst_buffer[:self.arq_burst_minimum_payload] ) # if we find data, replace it at this position with the new data and strip it if get_position >= 0: ARQ.rx_frame_buffer = ARQ.rx_frame_buffer[ : search_position + get_position ] self.log.warning( "[TNC] ARQ | RX | replacing existing buffer data", area=search_area, pos=get_position, ) else: self.log.debug("[TNC] ARQ | RX | appending data to buffer") ARQ.rx_frame_buffer += temp_burst_buffer self.arq_burst_last_payload = len(temp_burst_buffer) # Check if we didn't receive a BOF and EOF yet to avoid sending # ack frames if we already received all data if ( not self.rx_frame_bof_received and not self.rx_frame_eof_received and data_in.find(self.data_frame_eof) < 0 ): self.arq_calculate_speed_level(snr) self.data_channel_last_received = int(time.time()) + 6 + 6 self.burst_last_received = int(time.time()) + 6 + 6 # Create and send ACK frame self.log.info("[TNC] ARQ | RX | SENDING ACK", finished=ARQ.arq_seconds_until_finish, bytesperminute=ARQ.bytes_per_minute) self.send_burst_ack_frame(snr) # Reset n retries per burst counter self.n_retries_per_burst = 0 # calculate statistics self.calculate_transfer_rate_rx( self.rx_start_of_transmission, len(ARQ.rx_frame_buffer) ) # send a network message with information self.send_data_to_socket_queue( freedata="tnc-message", arq="transmission", status="receiving", uuid=self.transmission_uuid, percent=ARQ.arq_transmission_percent, bytesperminute=ARQ.bytes_per_minute, compression=ARQ.arq_compression_factor, mycallsign=str(self.mycallsign, 'UTF-8'), dxcallsign=str(self.dxcallsign, 'UTF-8'), finished=ARQ.arq_seconds_until_finish, irs=helpers.bool_to_string(self.is_IRS) ) # elif self.rx_n_frame_of_burst == self.rx_n_frames_per_burst: # # We have "Nones" in our rx buffer, # # Check if we received last frame of burst - this is an indicator for missed frames. # # With this way of doing this, we always MUST receive the last # # frame of a burst otherwise the entire burst is lost # # TODO: See if a timeout on the send side with re-transmit last burst would help. # self.log.debug( # "[TNC] last frames of burst received:", # frame=self.rx_n_frame_of_burst, # frames=self.rx_n_frames_per_burst, # # ) # self.calculate_transfer_rate_rx( # self.rx_start_of_transmission, len(ARQ.rx_frame_buffer) # ) # elif self.rx_n_frame_of_burst not in [self.rx_n_frames_per_burst - 1]: # self.log.info( # "[TNC] data_handler: received burst", # frame=self.rx_n_frame_of_burst + 1, # frames=self.rx_n_frames_per_burst, # ) # else: # self.log.error( # "[TNC] data_handler: Should not reach this point...", # frame=self.rx_n_frame_of_burst + 1, # frames=self.rx_n_frames_per_burst, # ) else: self.log.warning( "[TNC] data_handler: missing data in burst buffer...", frame=self.rx_n_frame_of_burst + 1, frames=self.rx_n_frames_per_burst ) # We have a BOF and EOF flag in our data. If we received both we received our frame. # In case of loosing data, but we received already a BOF and EOF we need to make sure, we # received the complete last burst by checking it for Nones bof_position = ARQ.rx_frame_buffer.find(self.data_frame_bof) eof_position = ARQ.rx_frame_buffer.find(self.data_frame_eof) # get total bytes per transmission information as soon we received a frame with a BOF if bof_position >= 0: self.arq_extract_statistics_from_data_frame(bof_position, eof_position) if ( bof_position >= 0 and eof_position > 0 and None not in ARQ.rx_burst_buffer ): self.log.debug( "[TNC] arq_data_received:", bof_position=bof_position, eof_position=eof_position, ) self.rx_frame_bof_received = True self.rx_frame_eof_received = True # Extract raw data from buffer payload = ARQ.rx_frame_buffer[ bof_position + len(self.data_frame_bof): eof_position ] # Get the data frame crc data_frame_crc = payload[:4] # 0:4 = 4 bytes # Get the data frame length frame_length = int.from_bytes(payload[4:8], "big") # 4:8 = 4 bytes ARQ.total_bytes = frame_length # 8:9 = compression factor data_frame = payload[9:] data_frame_crc_received = helpers.get_crc_32(data_frame) # check if hmac signing enabled if TNC.enable_hmac: self.log.info( "[TNC] [HMAC] Enabled", ) # now check if we have valid hmac signature - returns salt or bool salt_found = helpers.search_hmac_salt(self.dxcallsign, self.mycallsign, data_frame_crc, data_frame, token_iters=100) if salt_found: # hmac digest received self.arq_process_received_data_frame(data_frame, snr, signed=True) else: # hmac signature wrong self.arq_process_received_data_frame(data_frame, snr, signed=False) elif data_frame_crc == data_frame_crc_received: self.log.warning( "[TNC] [HMAC] Disabled, using CRC", ) self.arq_process_received_data_frame(data_frame, snr, signed=False) else: self.send_data_to_socket_queue( freedata="tnc-message", arq="transmission", status="failed", uuid=self.transmission_uuid, mycallsign=str(self.mycallsign, 'UTF-8'), dxcallsign=str(self.dxcallsign, 'UTF-8'), irs=helpers.bool_to_string(self.is_IRS) ) duration = time.time() - self.rx_start_of_transmission self.log.warning( "[TNC] ARQ | RX | DATA FRAME NOT SUCCESSFULLY RECEIVED!", e="wrong crc", expected=data_frame_crc.hex(), received=data_frame_crc_received.hex(), overflows=AudioParam.buffer_overflow_counter, nacks=self.frame_nack_counter, duration=duration, bytesperminute=ARQ.bytes_per_minute, compression=ARQ.arq_compression_factor, data=data_frame, ) if TNC.enable_stats: self.stats.push(frame_nack_counter=self.frame_nack_counter, status="wrong_crc", duration=duration) self.log.info("[TNC] ARQ | RX | Sending NACK", finished=ARQ.arq_seconds_until_finish, bytesperminute=ARQ.bytes_per_minute) self.send_burst_nack_frame(snr) # Update arq_session timestamp self.arq_session_last_received = int(time.time()) # Finally cleanup our buffers and states, self.arq_cleanup() def arq_extract_statistics_from_data_frame(self, bof_position, eof_position): payload = ARQ.rx_frame_buffer[ bof_position + len(self.data_frame_bof): eof_position ] frame_length = int.from_bytes(payload[4:8], "big") # 4:8 4bytes ARQ.total_bytes = frame_length compression_factor = int.from_bytes(payload[8:9], "big") # 4:8 4bytes # limit to max value of 255 compression_factor = np.clip(compression_factor, 0, 255) ARQ.arq_compression_factor = compression_factor / 10 self.calculate_transfer_rate_rx( self.rx_start_of_transmission, len(ARQ.rx_frame_buffer) ) def check_if_mode_fits_to_busy_slot(self): """ Check if actual mode is fitting into given busy state Returns: """ mode_name = FREEDV_MODE(self.mode_list[self.speed_level]).name mode_slots = FREEDV_MODE_USED_SLOTS[mode_name].value if mode_slots in [ModemParam.channel_busy_slot]: self.log.warning( "[TNC] busy slot detection", slots=ModemParam.channel_busy_slot, mode_slots=mode_slots, ) return False else: return True def arq_calculate_speed_level(self, snr): current_speed_level = self.speed_level self.frame_received_counter += 1 # try increasing speed level only if we had two successful decodes if self.frame_received_counter >= 2: self.frame_received_counter = 0 # make sure new speed level isn't higher than available modes new_speed_level = min(self.speed_level + 1, len(self.mode_list) - 1) # check if actual snr is higher than minimum snr for next mode if ModemParam.snr >= self.snr_list[new_speed_level]: self.speed_level = new_speed_level else: self.log.info("[TNC] ARQ | increasing speed level not possible because of SNR limit", given_snr=ModemParam.snr, needed_snr=self.snr_list[new_speed_level] ) # calculate if speed level fits to busy condition if not self.check_if_mode_fits_to_busy_slot(): self.speed_level = current_speed_level ARQ.arq_speed_level = self.speed_level # Update modes we are listening to self.set_listening_modes(False, True, self.mode_list[self.speed_level]) def arq_process_received_data_frame(self, data_frame, snr, signed): """ """ # transmittion duration signed = "True" if signed else "False" duration = time.time() - self.rx_start_of_transmission self.calculate_transfer_rate_rx( self.rx_start_of_transmission, len(ARQ.rx_frame_buffer) ) self.log.info("[TNC] ARQ | RX | DATA FRAME SUCCESSFULLY RECEIVED", nacks=self.frame_nack_counter, bytesperminute=ARQ.bytes_per_minute, total_bytes=ARQ.total_bytes, duration=duration, hmac_signed=signed) # Decompress the data frame data_frame_decompressed = lzma.decompress(data_frame) ARQ.arq_compression_factor = len(data_frame_decompressed) / len( data_frame ) data_frame = data_frame_decompressed self.transmission_uuid = str(uuid.uuid4()) timestamp = int(time.time()) # Re-code data_frame in base64, UTF-8 for JSON UI communication. base64_data = base64.b64encode(data_frame).decode("UTF-8") # check if RX_BUFFER isn't full if not RX_BUFFER.full(): # make sure we have always the correct buffer size RX_BUFFER.maxsize = int(ARQ.rx_buffer_size) else: # if full, free space by getting an item self.log.info( "[TNC] ARQ | RX | RX_BUFFER FULL - dropping old data", buffer_size=RX_BUFFER.qsize(), maxsize=int(ARQ.rx_buffer_size) ) RX_BUFFER.get() # add item to RX_BUFFER self.log.info( "[TNC] ARQ | RX | saving data to rx buffer", buffer_size=RX_BUFFER.qsize() + 1, maxsize=RX_BUFFER.maxsize ) try: # RX_BUFFER[0] = transmission uuid # RX_BUFFER[1] = timestamp # RX_BUFFER[2] = dxcallsign # RX_BUFFER[3] = dxgrid # RX_BUFFER[4] = data # RX_BUFFER[5] = hmac signed # RX_BUFFER[6] = compression factor # RX_BUFFER[7] = bytes per minute # RX_BUFFER[8] = duration # RX_BUFFER[9] = self.frame_nack_counter # RX_BUFFER[10] = speed list stats RX_BUFFER.put( [ self.transmission_uuid, timestamp, Station.dxcallsign, Station.dxgrid, base64_data, signed, ARQ.arq_compression_factor, ARQ.bytes_per_minute, duration, self.frame_nack_counter, ARQ.speed_list ] ) except Exception as e: # File "/usr/lib/python3.7/queue.py", line 133, in put # if self.maxsize > 0 # TypeError: '>' not supported between instances of 'str' and 'int' # # Occurs on Raspberry Pi and Python 3.7 self.log.error( "[TNC] ARQ | RX | error occurred when saving data!", e=e, uuid=self.transmission_uuid, timestamp=timestamp, dxcall=Station.dxcallsign, dxgrid=Station.dxgrid, data=base64_data ) if ARQ.arq_save_to_folder: try: self.save_data_to_folder( self.transmission_uuid, timestamp, self.mycallsign, Station.dxcallsign, Station.dxgrid, data_frame ) except Exception as e: self.log.error( "[TNC] ARQ | RX | can't save file to folder", e=e, uuid=self.transmission_uuid, timestamp=timestamp, dxcall=Station.dxcallsign, dxgrid=Station.dxgrid, data=base64_data ) self.send_data_to_socket_queue( freedata="tnc-message", arq="transmission", status="received", uuid=self.transmission_uuid, percent=ARQ.arq_transmission_percent, bytesperminute=ARQ.bytes_per_minute, compression=ARQ.arq_compression_factor, timestamp=timestamp, finished=0, mycallsign=str(self.mycallsign, "UTF-8"), dxcallsign=str(Station.dxcallsign, "UTF-8"), dxgrid=str(Station.dxgrid, "UTF-8"), data=base64_data, irs=helpers.bool_to_string(self.is_IRS), hmac_signed=signed, duration=duration, nacks=self.frame_nack_counter, speed_list=ARQ.speed_list ) if TNC.enable_stats: duration = time.time() - self.rx_start_of_transmission self.stats.push(frame_nack_counter=self.frame_nack_counter, status="received", duration=duration) self.log.info( "[TNC] ARQ | RX | SENDING DATA FRAME ACK") self.send_data_ack_frame(snr) # Update statistics AFTER the frame ACK is sent self.calculate_transfer_rate_rx( self.rx_start_of_transmission, len(ARQ.rx_frame_buffer) ) self.log.info( "[TNC] | RX | DATACHANNEL [" + str(self.mycallsign, "UTF-8") + "]<< >>[" + str(Station.dxcallsign, "UTF-8") + "]", snr=snr, ) def arq_transmit(self, data_out: bytes, hmac_salt: bytes): """ Transmit ARQ frame Args: data_out:bytes: """ # set signalling modes we want to listen to # we are in an ongoing arq transmission, so we don't need sig0 actually modem.RECEIVE_SIG0 = False modem.RECEIVE_SIG1 = True self.tx_n_retry_of_burst = 0 # retries we already sent data # Maximum number of retries to send before declaring a frame is lost # save len of data_out to TOTAL_BYTES for our statistics ARQ.total_bytes = len(data_out) self.arq_file_transfer = True frame_total_size = len(data_out).to_bytes(4, byteorder="big") # Compress data frame data_frame_compressed = lzma.compress(data_out) compression_factor = len(data_out) / len(data_frame_compressed) ARQ.arq_compression_factor = np.clip(compression_factor, 0, 255) compression_factor = bytes([int(ARQ.arq_compression_factor * 10)]) self.send_data_to_socket_queue( freedata="tnc-message", arq="transmission", status="transmitting", uuid=self.transmission_uuid, percent=ARQ.arq_transmission_percent, bytesperminute=ARQ.bytes_per_minute, compression=ARQ.arq_compression_factor, finished=ARQ.arq_seconds_until_finish, mycallsign=str(self.mycallsign, 'UTF-8'), dxcallsign=str(self.dxcallsign, 'UTF-8'), irs=helpers.bool_to_string(self.is_IRS) ) self.log.info( "[TNC] | TX | DATACHANNEL", Bytes=ARQ.total_bytes, ) data_out = data_frame_compressed # Reset data transfer statistics tx_start_of_transmission = time.time() self.calculate_transfer_rate_tx(tx_start_of_transmission, 0, len(data_out)) # check if hmac signature is available if hmac_salt not in ['', False]: print(data_out) # create hmac digest hmac_digest = hmac.new(hmac_salt, data_out, hashlib.sha256).digest() # truncate to 32bit frame_payload_crc = hmac_digest[:4] self.log.debug("[TNC] frame payload HMAC:", crc=frame_payload_crc.hex()) else: # Append a crc at the beginning and end of file indicators frame_payload_crc = helpers.get_crc_32(data_out) self.log.debug("[TNC] frame payload CRC:", crc=frame_payload_crc.hex()) # Assemble the data frame data_out = ( self.data_frame_bof + frame_payload_crc + frame_total_size + compression_factor + data_out + self.data_frame_eof ) self.log.debug("[TNC] frame raw data:", data=data_out) # Initial bufferposition is 0 bufferposition = 0 bufferposition_end = 0 bufferposition_burst_start = 0 # Iterate through data_out buffer while not self.data_frame_ack_received and ARQ.arq_state: # we have self.tx_n_max_retries_per_burst attempts for sending a burst for self.tx_n_retry_of_burst in range(self.tx_n_max_retries_per_burst): # Bound speed level to: # - minimum of either the speed or the length of mode list - 1 # - maximum of either the speed or zero self.speed_level = min(self.speed_level, len(self.mode_list) - 1) self.speed_level = max(self.speed_level, 0) ARQ.arq_speed_level = self.speed_level data_mode = self.mode_list[self.speed_level] self.log.debug( "[TNC] Speed-level:", level=self.speed_level, retry=self.tx_n_retry_of_burst, mode=FREEDV_MODE(data_mode).name, ) # Payload information payload_per_frame = modem.get_bytes_per_frame(data_mode) - 2 self.log.info("[TNC] early buffer info", bufferposition=bufferposition, bufferposition_end=bufferposition_end, bufferposition_burst_start=bufferposition_burst_start ) # check for maximum frames per burst for remaining data n_frames_per_burst = 1 if self.max_n_frames_per_burst > 1: while (payload_per_frame * n_frames_per_burst) % len(data_out[bufferposition_burst_start:]) == ( payload_per_frame * n_frames_per_burst): threading.Event().wait(0.01) #print((payload_per_frame * n_frames_per_burst) % len(data_out)) n_frames_per_burst += 1 if n_frames_per_burst == self.max_n_frames_per_burst: break else: n_frames_per_burst = 1 self.log.info("[TNC] calculated frames_per_burst:", n=n_frames_per_burst) tempbuffer = [] self.rpt_request_buffer = [] # Append data frames with n_frames_per_burst to tempbuffer for n_frame in range(n_frames_per_burst): arqheader = bytearray() arqheader[:1] = bytes([FR_TYPE.BURST_01.value + n_frame]) #####arqheader[:1] = bytes([FR_TYPE.BURST_01.value]) arqheader[1:2] = bytes([n_frames_per_burst]) arqheader[2:3] = self.session_id # only check for buffer position if at least one NACK received self.log.info("[TNC] ----- data buffer position:", iss_buffer_pos=bufferposition, irs_bufferposition=self.irs_buffer_position) if self.frame_nack_counter > 0 and self.irs_buffer_position != bufferposition: self.log.error("[TNC] ----- data buffer offset:", iss_buffer_pos=bufferposition, irs_bufferposition=self.irs_buffer_position) # only adjust buffer position for experimental versions if 'exp' in TNC.version: self.log.warning("[TNC] ----- data adjustment disabled!") # bufferposition = self.irs_buffer_position bufferposition_end = bufferposition + payload_per_frame - len(arqheader) # Normal condition if bufferposition_end <= len(data_out): frame = data_out[bufferposition:bufferposition_end] frame = arqheader + frame # Pad the last bytes of a frame else: extended_data_out = data_out[bufferposition:] extended_data_out += bytes([0]) * ( payload_per_frame - len(extended_data_out) - len(arqheader) ) frame = arqheader + extended_data_out ######tempbuffer = frame # [frame] tempbuffer.append(frame) # add data to our repeat request buffer for easy access if we received a request self.rpt_request_buffer.append(frame) # set new buffer position bufferposition = bufferposition_end self.log.debug("[TNC] tempbuffer:", tempbuffer=tempbuffer) self.log.info( "[TNC] ARQ | TX | FRAMES", mode=FREEDV_MODE(data_mode).name, fpb=n_frames_per_burst, retry=self.tx_n_retry_of_burst, ) self.enqueue_frame_for_tx(tempbuffer, c2_mode=data_mode) # After transmission finished, wait for an ACK or RPT frame while ( ARQ.arq_state and not self.burst_ack and not self.burst_nack and not self.rpt_request_received and not self.data_frame_ack_received ): threading.Event().wait(0.01) # Once we receive a burst ack, reset its state and break the RETRIES loop if self.burst_ack: self.burst_ack = False # reset ack state self.tx_n_retry_of_burst = 0 # reset retries self.log.debug( "[TNC] arq_transmit: Received BURST ACK. Sending next chunk." , irs_snr=self.burst_ack_snr) # update temp bufferposition for n frames per burst early calculation bufferposition_burst_start = bufferposition_end break # break retry loop if self.data_frame_ack_received: self.log.debug( "[TNC] arq_transmit: Received FRAME ACK. Braking retry loop." ) break # break retry loop if self.burst_nack: self.tx_n_retry_of_burst += 1 self.log.warning( "[TNC] arq_transmit: Received BURST NACK. Resending data", bufferposition_burst_start=bufferposition_burst_start, bufferposition=bufferposition ) bufferposition = bufferposition_burst_start self.burst_nack = False # reset nack state # We need this part for leaving the repeat loop # ARQ.arq_state == "DATA" --> when stopping transmission manually if not ARQ.arq_state: self.log.debug( "[TNC] arq_transmit: ARQ State changed to FALSE. Breaking retry loop." ) break self.calculate_transfer_rate_tx( tx_start_of_transmission, bufferposition_end, len(data_out) ) # NEXT ATTEMPT self.log.debug( "[TNC] ATTEMPT:", retry=self.tx_n_retry_of_burst, maxretries=self.tx_n_max_retries_per_burst, overflows=AudioParam.buffer_overflow_counter, ) # update buffer position bufferposition = bufferposition_end # update stats self.calculate_transfer_rate_tx( tx_start_of_transmission, bufferposition_end, len(data_out) ) self.send_data_to_socket_queue( freedata="tnc-message", arq="transmission", status="transmitting", uuid=self.transmission_uuid, percent=ARQ.arq_transmission_percent, bytesperminute=ARQ.bytes_per_minute, compression=ARQ.arq_compression_factor, finished=ARQ.arq_seconds_until_finish, irs_snr=self.burst_ack_snr, mycallsign=str(self.mycallsign, 'UTF-8'), dxcallsign=str(self.dxcallsign, 'UTF-8'), irs=helpers.bool_to_string(self.is_IRS) ) # Stay in the while loop until we receive a data_frame_ack. Otherwise, # the loop exits after sending the last frame only once and doesn't # wait for an acknowledgement. if self.data_frame_ack_received and bufferposition > len(data_out): self.log.debug("[TNC] arq_tx: Last fragment sent and acknowledged.") break # GOING TO NEXT ITERATION if self.data_frame_ack_received: self.arq_transmit_success() else: self.arq_transmit_failed() if TESTMODE: # Quit after transmission self.log.debug("[TNC] TESTMODE: arq_transmit exiting.") sys.exit(0) def arq_transmit_success(self): """ will be called if we successfully transmitted all of queued data """ # we need to wait until sending "transmitted" state # gui database is too slow for handling this within 0.001 seconds # so let's sleep a little threading.Event().wait(0.2) self.send_data_to_socket_queue( freedata="tnc-message", arq="transmission", status="transmitted", uuid=self.transmission_uuid, percent=ARQ.arq_transmission_percent, bytesperminute=ARQ.bytes_per_minute, compression=ARQ.arq_compression_factor, finished=ARQ.arq_seconds_until_finish, mycallsign=str(self.mycallsign, 'UTF-8'), dxcallsign=str(self.dxcallsign, 'UTF-8'), irs=helpers.bool_to_string(self.is_IRS), nacks=self.frame_nack_counter, speed_list=ARQ.speed_list ) self.log.info( "[TNC] ARQ | TX | DATA TRANSMITTED!", BytesPerMinute=ARQ.bytes_per_minute, total_bytes=ARQ.total_bytes, BitsPerSecond=ARQ.arq_bits_per_second, overflows=AudioParam.buffer_overflow_counter, ) # finally do an arq cleanup self.arq_cleanup() def arq_transmit_failed(self): """ will be called if we not successfully transmitted all of queued data """ self.send_data_to_socket_queue( freedata="tnc-message", arq="transmission", status="failed", uuid=self.transmission_uuid, percent=ARQ.arq_transmission_percent, bytesperminute=ARQ.bytes_per_minute, compression=ARQ.arq_compression_factor, mycallsign=str(self.mycallsign, 'UTF-8'), dxcallsign=str(self.dxcallsign, 'UTF-8'), irs=helpers.bool_to_string(self.is_IRS), nacks=self.frame_nack_counter, speed_list=ARQ.speed_list ) self.log.info( "[TNC] ARQ | TX | TRANSMISSION FAILED OR TIME OUT!", overflows=AudioParam.buffer_overflow_counter, ) self.stop_transmission() def burst_ack_nack_received(self, data_in: bytes) -> None: """ Received an ACK/NACK for a transmitted frame, keep track and make adjustments to speed level if needed. Args: data_in:bytes: Returns: """ # Process data only if we are in ARQ and BUSY state if ARQ.arq_state: Station.dxgrid = b'------' helpers.add_to_heard_stations( self.dxcallsign, Station.dxgrid, "DATA", ModemParam.snr, ModemParam.frequency_offset, HamlibParam.hamlib_frequency, ) frametype = int.from_bytes(bytes(data_in[:1]), "big") if frametype == FR_TYPE.BURST_ACK.value: # Increase speed level if we received a burst ack # self.speed_level = min(self.speed_level + 1, len(self.mode_list) - 1) # Force data retry loops of TX TNC to stop and continue with next frame self.burst_ack = True # Reset burst nack counter self.burst_nack_counter = 0 # Reset n retries per burst counter self.n_retries_per_burst = 0 self.irs_buffer_position = int.from_bytes(data_in[4:8], "big") self.burst_ack_snr = helpers.snr_from_bytes(data_in[2:3]) else: # Decrease speed level if we received a burst nack # self.speed_level = max(self.speed_level - 1, 0) # Set flag to retry frame again. self.burst_nack = True # Increment burst nack counter self.burst_nack_counter += 1 self.burst_ack_snr = 'NaN' self.irs_buffer_position = int.from_bytes(data_in[5:9], "big") self.log.warning( "[TNC] ARQ | TX | Burst NACK received", burst_nack_counter=self.burst_nack_counter, irs_buffer_position=self.irs_buffer_position, ) # Update data_channel timestamp self.data_channel_last_received = int(time.time()) # self.burst_ack_snr = int.from_bytes(bytes(data_in[2:3]), "big") self.burst_ack_snr = helpers.snr_from_bytes(data_in[2:3]) # self.log.info("SNR ON IRS", snr=self.burst_ack_snr) self.speed_level = int.from_bytes(bytes(data_in[3:4]), "big") ARQ.arq_speed_level = self.speed_level def frame_ack_received( self, data_in: bytes # pylint: disable=unused-argument ) -> None: """Received an ACK for a transmitted frame""" # Process data only if we are in ARQ and BUSY state if ARQ.arq_state: Station.dxgrid = b'------' helpers.add_to_heard_stations( Station.dxcallsign, Station.dxgrid, "DATA", ModemParam.snr, ModemParam.frequency_offset, HamlibParam.hamlib_frequency, ) # Force data loops of TNC to stop and continue with next frame self.data_frame_ack_received = True # Update arq_session and data_channel timestamp self.data_channel_last_received = int(time.time()) self.arq_session_last_received = int(time.time()) def frame_nack_received( self, data_in: bytes # pylint: disable=unused-argument ) -> None: """ Received a NACK for a transmitted frame Args: data_in:bytes: """ self.log.warning("[TNC] ARQ FRAME NACK RECEIVED - cleanup!", arq="transmission", status="failed", uuid=self.transmission_uuid, percent=ARQ.arq_transmission_percent, bytesperminute=ARQ.bytes_per_minute, mycallsign=str(self.mycallsign, 'UTF-8'), dxcallsign=str(self.dxcallsign, 'UTF-8'), irs=helpers.bool_to_string(self.is_IRS), nacks=self.frame_nack_counter, speed_list=ARQ.speed_list ) Station.dxgrid = b'------' helpers.add_to_heard_stations( Station.dxcallsign, Station.dxgrid, "DATA", ModemParam.snr, ModemParam.frequency_offset, HamlibParam.hamlib_frequency, ) self.send_data_to_socket_queue( freedata="tnc-message", arq="transmission", status="failed", uuid=self.transmission_uuid, percent=ARQ.arq_transmission_percent, bytesperminute=ARQ.bytes_per_minute, compression=ARQ.arq_compression_factor, mycallsign=str(self.mycallsign, 'UTF-8'), dxcallsign=str(self.dxcallsign, 'UTF-8'), irs=helpers.bool_to_string(self.is_IRS), nacks=self.frame_nack_counter, speed_list=ARQ.speed_list ) # Update data_channel timestamp self.arq_session_last_received = int(time.time()) self.arq_cleanup() def burst_rpt_received(self, data_in: bytes): """ Repeat request frame received for transmitted frame Args: data_in:bytes: """ # Only process data if we are in ARQ and BUSY state if not ARQ.arq_state or TNC.tnc_state != "BUSY": return Station.dxgrid = b'------' helpers.add_to_heard_stations( Station.dxcallsign, Station.dxgrid, "DATA", ModemParam.snr, ModemParam.frequency_offset, HamlibParam.hamlib_frequency, ) self.log.info("[TNC] ARQ REPEAT RECEIVED") # self.rpt_request_received = True # Update data_channel timestamp self.data_channel_last_received = int(time.time()) # self.rpt_request_buffer = [] missing_area = bytes(data_in[2:12]) # 1:9 missing_area = missing_area.strip(b"\x00") print(missing_area) print(self.rpt_request_buffer) tempbuffer_rptframes = [] for i in range(len(missing_area)): print(missing_area[i]) missing_frames_buffer_position = missing_area[i] - 1 tempbuffer_rptframes.append(self.rpt_request_buffer[missing_frames_buffer_position]) self.log.info("[TNC] SENDING REPEAT....") data_mode = self.mode_list[self.speed_level] self.enqueue_frame_for_tx(tempbuffer_rptframes, c2_mode=data_mode) # for i in range(0, 6, 2): # if not missing_area[i: i + 2].endswith(b"\x00\x00"): # self.rpt_request_buffer.insert(0, missing_area[i: i + 2]) ############################################################################################################ # ARQ SESSION HANDLER ############################################################################################################ def arq_session_handler(self, mycallsign, dxcallsign, attempts) -> bool: """ Create a session with `Station.dxcallsign` and wait until the session is open. Returns: True if the session was opened successfully False if the session open request failed """ # override connection attempts self.session_connect_max_retries = attempts self.mycallsign = mycallsign self.dxcallsign = dxcallsign Station.dxcallsign = self.dxcallsign Station.dxcallsign_crc = helpers.get_crc_24(self.dxcallsign) # TODO: we need to check this, maybe placing it to class init self.datachannel_timeout = False self.log.info( "[TNC] SESSION [" + str(self.mycallsign, "UTF-8") + "]>> <<[" + str(self.dxcallsign, "UTF-8") + "]", state=ARQ.arq_session_state, ) # Let's check if we have a busy channel if ModemParam.channel_busy: self.log.warning("[TNC] Channel busy, waiting until free...") self.send_data_to_socket_queue( freedata="tnc-message", arq="session", status="waiting", mycallsign=str(self.mycallsign, 'UTF-8'), dxcallsign=str(self.dxcallsign, 'UTF-8'), ) # wait while timeout not reached and our busy state is busy channel_busy_timeout = time.time() + 15 while ModemParam.channel_busy and time.time() < channel_busy_timeout and not self.check_if_mode_fits_to_busy_slot(): threading.Event().wait(0.01) # if channel busy timeout reached stop connecting if time.time() > channel_busy_timeout: self.log.warning("[TNC] Channel busy, try again later...") ARQ.arq_session_state = "failed" self.send_data_to_socket_queue( freedata="tnc-message", arq="session", status="failed", reason="busy", mycallsign=str(self.mycallsign, 'UTF-8'), dxcallsign=str(self.dxcallsign, 'UTF-8'), ) return False self.open_session() # wait until data channel is open while not ARQ.arq_session and not self.arq_session_timeout: threading.Event().wait(0.01) ARQ.arq_session_state = "connecting" self.send_data_to_socket_queue( freedata="tnc-message", arq="session", status="connecting", mycallsign=str(self.mycallsign, 'UTF-8'), dxcallsign=str(self.dxcallsign, 'UTF-8'), ) if ARQ.arq_session and ARQ.arq_session_state == "connected": # ARQ.arq_session_state = "connected" self.send_data_to_socket_queue( freedata="tnc-message", arq="session", status="connected", mycallsign=str(self.mycallsign, 'UTF-8'), dxcallsign=str(self.dxcallsign, 'UTF-8'), ) return True self.log.warning( "[TNC] SESSION FAILED [" + str(self.mycallsign, "UTF-8") + "]>>X<<[" + str(self.dxcallsign, "UTF-8") + "]", attempts=self.session_connect_max_retries, # Adjust for 0-based for user display reason="maximum connection attempts reached", state=ARQ.arq_session_state, ) ARQ.arq_session_state = "failed" self.send_data_to_socket_queue( freedata="tnc-message", arq="session", status="failed", reason="timeout", mycallsign=str(self.mycallsign, 'UTF-8'), dxcallsign=str(self.dxcallsign, 'UTF-8'), ) return False def open_session(self) -> bool: """ Create and send the frame to request a connection. Returns: True if the session was opened successfully False if the session open request failed """ self.IS_ARQ_SESSION_MASTER = True ARQ.arq_session_state = "connecting" # create a random session id self.session_id = np.random.bytes(1) connection_frame = bytearray(self.length_sig0_frame) connection_frame[:1] = bytes([FR_TYPE.ARQ_SESSION_OPEN.value]) connection_frame[1:2] = self.session_id connection_frame[2:5] = Station.dxcallsign_crc connection_frame[5:8] = Station.mycallsign_crc connection_frame[8:14] = helpers.callsign_to_bytes(self.mycallsign) while not ARQ.arq_session: threading.Event().wait(0.01) for attempt in range(self.session_connect_max_retries): self.log.info( "[TNC] SESSION [" + str(self.mycallsign, "UTF-8") + "]>>?<<[" + str(self.dxcallsign, "UTF-8") + "]", a=f"{str(attempt + 1)}/{str(self.session_connect_max_retries)}", state=ARQ.arq_session_state, ) self.send_data_to_socket_queue( freedata="tnc-message", arq="session", status="connecting", attempt=attempt + 1, maxattempts=self.session_connect_max_retries, mycallsign=str(self.mycallsign, 'UTF-8'), dxcallsign=str(self.dxcallsign, 'UTF-8'), ) self.enqueue_frame_for_tx([connection_frame], c2_mode=FREEDV_MODE.sig0.value, copies=1, repeat_delay=0) # Wait for a time, looking to see if `ARQ.arq_session` # indicates we've received a positive response from the far station. timeout = time.time() + 3 while time.time() < timeout: threading.Event().wait(0.01) # Stop waiting if data channel is opened if ARQ.arq_session: return True # Stop waiting and interrupt if data channel is getting closed while opening if ARQ.arq_session_state == "disconnecting": # disabled this session close as its called twice # self.close_session() return False # Session connect timeout, send close_session frame to # attempt to clean up the far-side, if it received the # open_session frame and can still hear us. if not ARQ.arq_session: self.close_session() return False # Given the while condition, it will only exit when `ARQ.arq_session` is True self.send_data_to_socket_queue( freedata="tnc-message", arq="session", status="connected", mycallsign=str(self.mycallsign, 'UTF-8'), dxcallsign=str(self.dxcallsign, 'UTF-8'), ) return True def received_session_opener(self, data_in: bytes) -> None: """ Received a session open request packet. Args: data_in:bytes: """ # if we don't want to respond to calls, return False if not TNC.respond_to_call: return False # ignore channel opener if already in ARQ STATE # use case: Station A is connecting to Station B while # Station B already tries connecting to Station A. # For avoiding ignoring repeated connect request in case of packet loss # we are only ignoring packets in case we are ISS if ARQ.arq_session and self.IS_ARQ_SESSION_MASTER: return False self.IS_ARQ_SESSION_MASTER = False ARQ.arq_session_state = "connecting" # Update arq_session timestamp self.arq_session_last_received = int(time.time()) self.session_id = bytes(data_in[1:2]) Station.dxcallsign_crc = bytes(data_in[5:8]) self.dxcallsign = helpers.bytes_to_callsign(bytes(data_in[8:14])) Station.dxcallsign = self.dxcallsign # check if callsign ssid override valid, mycallsign = helpers.check_callsign(self.mycallsign, data_in[2:5]) self.mycallsign = mycallsign Station.dxgrid = b'------' helpers.add_to_heard_stations( Station.dxcallsign, Station.dxgrid, "DATA", ModemParam.snr, ModemParam.frequency_offset, HamlibParam.hamlib_frequency, ) self.log.info( "[TNC] SESSION [" + str(self.mycallsign, "UTF-8") + "]>>|<<[" + str(self.dxcallsign, "UTF-8") + "]", state=ARQ.arq_session_state, ) ARQ.arq_session = True TNC.tnc_state = "BUSY" self.send_data_to_socket_queue( freedata="tnc-message", arq="session", status="connected", mycallsign=str(self.mycallsign, 'UTF-8'), dxcallsign=str(self.dxcallsign, 'UTF-8'), ) self.transmit_session_heartbeat() def close_session(self) -> None: """Close the ARQ session""" ARQ.arq_session_state = "disconnecting" self.log.info( "[TNC] SESSION [" + str(self.mycallsign, "UTF-8") + "]<>[" + str(self.dxcallsign, "UTF-8") + "]", state=ARQ.arq_session_state, ) self.send_data_to_socket_queue( freedata="tnc-message", arq="session", status="close", mycallsign=str(self.mycallsign, 'UTF-8'), dxcallsign=str(self.dxcallsign, 'UTF-8'), ) self.IS_ARQ_SESSION_MASTER = False ARQ.arq_session = False # we need to send disconnect frame before doing arq cleanup # we would lose our session id then self.send_disconnect_frame() self.arq_cleanup() def received_session_close(self, data_in: bytes): """ Closes the session when a close session frame is received and the DXCALLSIGN_CRC matches the remote station participating in the session. Args: data_in:bytes: """ # We've arrived here from process_data which already checked that the frame # is intended for this station. # Close the session if the CRC matches the remote station in static. _valid_crc, mycallsign = helpers.check_callsign(self.mycallsign, bytes(data_in[2:5])) _valid_session = helpers.check_session_id(self.session_id, bytes(data_in[1:2])) if (_valid_crc or _valid_session) and ARQ.arq_session_state not in ["disconnected"]: ARQ.arq_session_state = "disconnected" Station.dxgrid = b'------' helpers.add_to_heard_stations( Station.dxcallsign, Station.dxgrid, "DATA", ModemParam.snr, ModemParam.frequency_offset, HamlibParam.hamlib_frequency, ) self.log.info( "[TNC] SESSION [" + str(mycallsign, "UTF-8") + "]<>[" + str(self.dxcallsign, "UTF-8") + "]", state=ARQ.arq_session_state, ) self.send_data_to_socket_queue( freedata="tnc-message", arq="session", status="close", mycallsign=str(mycallsign, 'UTF-8'), dxcallsign=str(self.dxcallsign, 'UTF-8'), ) self.IS_ARQ_SESSION_MASTER = False ARQ.arq_session = False self.arq_cleanup() def transmit_session_heartbeat(self) -> None: """Send ARQ sesion heartbeat while connected""" # ARQ.arq_session = True # TNC.tnc_state = "BUSY" # ARQ.arq_session_state = "connected" connection_frame = bytearray(self.length_sig0_frame) connection_frame[:1] = bytes([FR_TYPE.ARQ_SESSION_HB.value]) connection_frame[1:2] = self.session_id self.send_data_to_socket_queue( freedata="tnc-message", arq="session", status="connected", heartbeat="transmitting", mycallsign=str(self.mycallsign, 'UTF-8'), dxcallsign=str(self.dxcallsign, 'UTF-8'), ) self.enqueue_frame_for_tx([connection_frame], c2_mode=FREEDV_MODE.sig0.value, copies=1, repeat_delay=0) def received_session_heartbeat(self, data_in: bytes) -> None: """ Received an ARQ session heartbeat, record and update state accordingly. Args: data_in:bytes: """ # Accept session data if the DXCALLSIGN_CRC matches the station in static or session id. _valid_crc, _ = helpers.check_callsign(self.dxcallsign, bytes(data_in[4:7])) _valid_session = helpers.check_session_id(self.session_id, bytes(data_in[1:2])) if _valid_crc or _valid_session and ARQ.arq_session_state in ["connected", "connecting"]: self.log.debug("[TNC] Received session heartbeat") Station.dxgrid = b'------' helpers.add_to_heard_stations( self.dxcallsign, Station.dxgrid, "SESSION-HB", ModemParam.snr, ModemParam.frequency_offset, HamlibParam.hamlib_frequency, ) self.send_data_to_socket_queue( freedata="tnc-message", arq="session", status="connected", heartbeat="received", mycallsign=str(self.mycallsign, 'UTF-8'), dxcallsign=str(self.dxcallsign, 'UTF-8'), ) ARQ.arq_session = True ARQ.arq_session_state = "connected" TNC.tnc_state = "BUSY" # Update the timeout timestamps self.arq_session_last_received = int(time.time()) self.data_channel_last_received = int(time.time()) # transmit session heartbeat only # -> if not session master # --> this will be triggered by heartbeat watchdog # -> if not during a file transfer # -> if ARQ_SESSION_STATE != disconnecting, disconnected, failed # --> to avoid heartbeat toggle loops while disconnecting if ( not self.IS_ARQ_SESSION_MASTER and not self.arq_file_transfer and ARQ.arq_session_state != 'disconnecting' and ARQ.arq_session_state != 'disconnected' and ARQ.arq_session_state != 'failed' ): self.transmit_session_heartbeat() ########################################################################################################## # ARQ DATA CHANNEL HANDLER ########################################################################################################## def open_dc_and_transmit( self, data_out: bytes, transmission_uuid: str, mycallsign, dxcallsign, attempts: int, hmac_salt: str ) -> bool: """ Open data channel and transmit data Args: data_out:bytes: transmission_uuid:str: mycallsign:bytes: attempts:int: Overriding number of attempts initiating a connection Returns: True if the data session was opened and the data was sent False if the data session was not opened """ # overwrite mycallsign in case of different SSID self.mycallsign = mycallsign self.dxcallsign = dxcallsign Station.dxcallsign = dxcallsign Station.dxcallsign_crc = helpers.get_crc_24(Station.dxcallsign) # override session connection attempts self.data_channel_max_retries = attempts TNC.tnc_state = "BUSY" self.arq_file_transfer = True self.transmission_uuid = transmission_uuid # wait a moment for the case, a heartbeat is already on the way back to us # this makes channel establishment more clean if ARQ.arq_session: threading.Event().wait(2.5) self.datachannel_timeout = False # we need to compress data for getting a compression factor. # so we are compressing twice. This is not that nice and maybe there is another way # for calculating transmission statistics # ARQ.arq_compression_factor = len(data_out) / len(lzma.compress(data_out)) self.arq_open_data_channel(mycallsign) # wait until data channel is open while not ARQ.arq_state and not self.datachannel_timeout and TNC.tnc_state in ["BUSY"]: threading.Event().wait(0.01) if ARQ.arq_state: self.arq_transmit(data_out, hmac_salt) return True return False def arq_open_data_channel( self, mycallsign ) -> bool: """ Open an ARQ data channel. Args: mycallsign:bytes: Returns: True if the data channel was opened successfully False if the data channel failed to open """ self.is_IRS = False # init a new random session id if we are not in an arq session if not ARQ.arq_session: self.session_id = np.random.bytes(1) # Update data_channel timestamp self.data_channel_last_received = int(time.time()) if TNC.low_bandwidth_mode: frametype = bytes([FR_TYPE.ARQ_DC_OPEN_N.value]) self.log.debug("[TNC] Requesting low bandwidth mode") else: frametype = bytes([FR_TYPE.ARQ_DC_OPEN_W.value]) self.log.debug("[TNC] Requesting high bandwidth mode") connection_frame = bytearray(self.length_sig0_frame) connection_frame[:1] = frametype connection_frame[1:4] = Station.dxcallsign_crc connection_frame[4:7] = Station.mycallsign_crc connection_frame[7:13] = helpers.callsign_to_bytes(mycallsign) connection_frame[13:14] = self.session_id while not ARQ.arq_state: threading.Event().wait(0.01) for attempt in range(self.data_channel_max_retries): self.send_data_to_socket_queue( freedata="tnc-message", arq="transmission", status="opening", mycallsign=str(mycallsign, 'UTF-8'), dxcallsign=str(self.dxcallsign, 'UTF-8'), irs=helpers.bool_to_string(self.is_IRS) ) self.log.info( "[TNC] ARQ | DATA | TX | [" + str(mycallsign, "UTF-8") + "]>> <<[" + str(self.dxcallsign, "UTF-8") + "]", attempt=f"{str(attempt + 1)}/{str(self.data_channel_max_retries)}", ) # Let's check if we have a busy channel and if we are not in a running arq session. if ModemParam.channel_busy and not ARQ.arq_state: self.log.warning("[TNC] Channel busy, waiting until free...") self.send_data_to_socket_queue( freedata="tnc-message", arq="transmission", status="waiting", mycallsign=str(self.mycallsign, 'UTF-8'), dxcallsign=str(self.dxcallsign, 'UTF-8'), irs=helpers.bool_to_string(self.is_IRS) ) # wait while timeout not reached and our busy state is busy channel_busy_timeout = time.time() + 5 while ModemParam.channel_busy and time.time() < channel_busy_timeout and not self.check_if_mode_fits_to_busy_slot(): threading.Event().wait(0.01) self.enqueue_frame_for_tx([connection_frame], c2_mode=FREEDV_MODE.sig0.value, copies=1, repeat_delay=0) timeout = time.time() + self.duration_sig1_frame * 3 + (ModemParam.tx_delay / 1000 * 2) while time.time() < timeout: threading.Event().wait(0.01) # Stop waiting if data channel is opened if ARQ.arq_state: return True if TNC.tnc_state in ["IDLE"]: return False # `data_channel_max_retries` attempts have been sent. Aborting attempt & cleaning up self.log.debug( "[TNC] arq_open_data_channel:", transmission_uuid=self.transmission_uuid ) self.send_data_to_socket_queue( freedata="tnc-message", arq="transmission", status="failed", reason="unknown", uuid=self.transmission_uuid, percent=ARQ.arq_transmission_percent, bytesperminute=ARQ.bytes_per_minute, compression=ARQ.arq_compression_factor, mycallsign=str(self.mycallsign, 'UTF-8'), dxcallsign=str(self.dxcallsign, 'UTF-8'), irs=helpers.bool_to_string(self.is_IRS), nacks=self.frame_nack_counter, speed_list=ARQ.speed_list ) self.log.warning( "[TNC] ARQ | TX | DATA [" + str(mycallsign, "UTF-8") + "]>>X<<[" + str(self.dxcallsign, "UTF-8") + "]" ) self.datachannel_timeout = True # Attempt to clean up the far-side, if it received the # open_session frame and can still hear us. self.close_session() return False # Shouldn't get here... return True def arq_received_data_channel_opener(self, data_in: bytes): """ Received request to open data channel frame Args: data_in:bytes: """ # We've arrived here from process_data which already checked that the frame # is intended for this station. # stop processing if we don't want to respond to a call when not in a arq session if not TNC.respond_to_call and not ARQ.arq_session: return False # stop processing if not in arq session, but tnc state is busy and we have a different session id # use-case we get a connection request while connecting to another station if not ARQ.arq_session and TNC.tnc_state in ["BUSY"] and data_in[13:14] != self.session_id: return False self.arq_file_transfer = True # check if callsign ssid override _, self.mycallsign = helpers.check_callsign(self.mycallsign, data_in[1:4]) # ignore channel opener if already in ARQ STATE # use case: Station A is connecting to Station B while # Station B already tries connecting to Station A. # For avoiding ignoring repeated connect request in case of packet loss # we are only ignoring packets in case we are ISS if ARQ.arq_state and not self.is_IRS: return False self.is_IRS = True Station.dxcallsign_crc = bytes(data_in[4:7]) self.dxcallsign = helpers.bytes_to_callsign(bytes(data_in[7:13])) Station.dxcallsign = self.dxcallsign self.send_data_to_socket_queue( freedata="tnc-message", arq="transmission", status="opening", mycallsign=str(self.mycallsign, 'UTF-8'), dxcallsign=str(self.dxcallsign, 'UTF-8'), irs=helpers.bool_to_string(self.is_IRS) ) # n_frames_per_burst is currently unused # n_frames_per_burst = int.from_bytes(bytes(data_in[13:14]), "big") frametype = int.from_bytes(bytes(data_in[:1]), "big") # check if we received low bandwidth mode # possible channel constellations # ISS(w) <-> IRS(w) # ISS(w) <-> IRS(n) # ISS(n) <-> IRS(w) # ISS(n) <-> IRS(n) if frametype == FR_TYPE.ARQ_DC_OPEN_W.value and not TNC.low_bandwidth_mode: # ISS(w) <-> IRS(w) constellation = "ISS(w) <-> IRS(w)" self.received_LOW_BANDWIDTH_MODE = False self.mode_list = self.mode_list_high_bw self.time_list = self.time_list_high_bw self.snr_list = self.snr_list_high_bw elif frametype == FR_TYPE.ARQ_DC_OPEN_W.value: # ISS(w) <-> IRS(n) constellation = "ISS(w) <-> IRS(n)" self.received_LOW_BANDWIDTH_MODE = False self.mode_list = self.mode_list_low_bw self.time_list = self.time_list_low_bw self.snr_list = self.snr_list_low_bw elif frametype == FR_TYPE.ARQ_DC_OPEN_N.value and not TNC.low_bandwidth_mode: # ISS(n) <-> IRS(w) constellation = "ISS(n) <-> IRS(w)" self.received_LOW_BANDWIDTH_MODE = True self.mode_list = self.mode_list_low_bw self.time_list = self.time_list_low_bw self.snr_list = self.snr_list_low_bw elif frametype == FR_TYPE.ARQ_DC_OPEN_N.value: # ISS(n) <-> IRS(n) constellation = "ISS(n) <-> IRS(n)" self.received_LOW_BANDWIDTH_MODE = True self.mode_list = self.mode_list_low_bw self.time_list = self.time_list_low_bw self.snr_list = self.snr_list_low_bw else: constellation = "not matched" self.received_LOW_BANDWIDTH_MODE = True self.mode_list = self.mode_list_low_bw self.time_list = self.time_list_low_bw self.snr_list = self.snr_list_low_bw # get mode which fits to given SNR # initially set speed_level 0 in case of bad SNR and no matching mode self.speed_level = 0 # TODO: MOVE THIS TO arq_calculate_speed_level() # calculate speed level in correlation to latest known SNR for i in range(len(self.mode_list)): if ModemParam.snr >= self.snr_list[i]: self.speed_level = i # calculate if speed level fits to busy condition mode_name = codec2.FREEDV_MODE(self.mode_list[self.speed_level]).name mode_slots = codec2.FREEDV_MODE_USED_SLOTS[mode_name].value if mode_slots in [ModemParam.channel_busy_slot]: self.speed_level = 0 self.log.warning( "[TNC] busy slot detection", slots=ModemParam.channel_busy_slot, mode_slots=mode_slots, ) self.log.debug( "[TNC] calculated speed level", speed_level=self.speed_level, given_snr=ModemParam.snr, min_snr=self.snr_list[self.speed_level], ) # Update modes we are listening to self.set_listening_modes(True, True, self.mode_list[self.speed_level]) Station.dxgrid = b'------' helpers.add_to_heard_stations( Station.dxcallsign, Station.dxgrid, "DATA", ModemParam.snr, ModemParam.frequency_offset, HamlibParam.hamlib_frequency, ) self.session_id = data_in[13:14] # check again if callsign ssid override _, self.mycallsign = helpers.check_callsign(self.mycallsign, data_in[1:4]) self.log.info( "[TNC] ARQ | DATA | RX | [" + str(self.mycallsign, "UTF-8") + "]>> <<[" + str(self.dxcallsign, "UTF-8") + "]", channel_constellation=constellation, ) # Reset data_channel/burst timestamps self.data_channel_last_received = int(time.time()) self.burst_last_received = int(time.time() + 10) # we might need some more time so lets increase this # Set ARQ State AFTER resetting timeouts # this avoids timeouts starting too early ARQ.arq_state = True TNC.tnc_state = "BUSY" self.reset_statistics() # Select the frame type based on the current TNC mode if TNC.low_bandwidth_mode or self.received_LOW_BANDWIDTH_MODE: frametype = bytes([FR_TYPE.ARQ_DC_OPEN_ACK_N.value]) self.log.debug("[TNC] Responding with low bandwidth mode") else: frametype = bytes([FR_TYPE.ARQ_DC_OPEN_ACK_W.value]) self.log.debug("[TNC] Responding with high bandwidth mode") connection_frame = bytearray(self.length_sig0_frame) connection_frame[:1] = frametype connection_frame[1:2] = self.session_id connection_frame[8:9] = bytes([self.speed_level]) connection_frame[13:14] = bytes([ARQ.arq_protocol_version]) self.enqueue_frame_for_tx([connection_frame], c2_mode=FREEDV_MODE.sig0.value, copies=1, repeat_delay=0) self.send_data_to_socket_queue( freedata="tnc-message", arq="transmission", status="opened", mycallsign=str(self.mycallsign, 'UTF-8'), dxcallsign=str(self.dxcallsign, 'UTF-8'), irs=helpers.bool_to_string(self.is_IRS) ) self.log.info( "[TNC] ARQ | DATA | RX | [" + str(self.mycallsign, "UTF-8") + "]>>|<<[" + str(self.dxcallsign, "UTF-8") + "]", bandwidth="wide", snr=ModemParam.snr, ) # set start of transmission for our statistics self.rx_start_of_transmission = time.time() # Reset data_channel/burst timestamps once again for avoiding running into timeout self.data_channel_last_received = int(time.time()) self.burst_last_received = int(time.time() + 10) # we might need some more time so lets increase this def arq_received_channel_is_open(self, data_in: bytes) -> None: """ Called if we received a data channel opener Args: data_in:bytes: """ protocol_version = int.from_bytes(bytes(data_in[13:14]), "big") if protocol_version == ARQ.arq_protocol_version: self.send_data_to_socket_queue( freedata="tnc-message", arq="transmission", status="opened", mycallsign=str(self.mycallsign, 'UTF-8'), dxcallsign=str(self.dxcallsign, 'UTF-8'), irs=helpers.bool_to_string(self.is_IRS) ) frametype = int.from_bytes(bytes(data_in[:1]), "big") if frametype == FR_TYPE.ARQ_DC_OPEN_ACK_N.value: self.received_LOW_BANDWIDTH_MODE = True self.mode_list = self.mode_list_low_bw self.time_list = self.time_list_low_bw self.log.debug("[TNC] low bandwidth mode", modes=self.mode_list) else: self.received_LOW_BANDWIDTH_MODE = False self.mode_list = self.mode_list_high_bw self.time_list = self.time_list_high_bw self.log.debug("[TNC] high bandwidth mode", modes=self.mode_list) # set speed level from session opener frame which is selected by SNR measurement self.speed_level = int.from_bytes(bytes(data_in[8:9]), "big") self.log.debug("[TNC] speed level selected for given SNR", speed_level=self.speed_level) # self.speed_level = len(self.mode_list) - 1 Station.dxgrid = b'------' helpers.add_to_heard_stations( Station.dxcallsign, Station.dxgrid, "DATA", ModemParam.snr, ModemParam.frequency_offset, HamlibParam.hamlib_frequency, ) self.log.info( "[TNC] ARQ | DATA | TX | [" + str(self.mycallsign, "UTF-8") + "]>>|<<[" + str(self.dxcallsign, "UTF-8") + "]", snr=ModemParam.snr, ) # as soon as we set ARQ_STATE to DATA, transmission starts ARQ.arq_state = True # Update data_channel timestamp self.data_channel_last_received = int(time.time()) else: TNC.tnc_state = "IDLE" ARQ.arq_state = False self.send_data_to_socket_queue( freedata="tnc-message", arq="transmission", status="failed", reason="protocol version missmatch", mycallsign=str(self.mycallsign, 'UTF-8'), dxcallsign=str(self.dxcallsign, 'UTF-8'), irs=helpers.bool_to_string(self.is_IRS) ) # TODO: We should display a message to this effect on the UI. self.log.warning( "[TNC] protocol version mismatch:", received=protocol_version, own=ARQ.arq_protocol_version, ) self.stop_transmission() # ---------- PING def transmit_ping(self, mycallsign: bytes, dxcallsign: bytes) -> None: """ Funktion for controlling pings Args: mycallsign:bytes: dxcallsign:bytes: """ if not str(dxcallsign).strip(): # TODO: We should display a message to this effect on the UI. self.log.warning("[TNC] Missing required callsign", dxcallsign=dxcallsign) return Station.dxcallsign = dxcallsign Station.dxcallsign_crc = helpers.get_crc_24(Station.dxcallsign) self.send_data_to_socket_queue( freedata="tnc-message", ping="transmitting", dxcallsign=str(dxcallsign, "UTF-8"), mycallsign=str(mycallsign, "UTF-8"), snr=str(ModemParam.snr), ) self.log.info( "[TNC] PING REQ [" + str(mycallsign, "UTF-8") + "] >>> [" + str(dxcallsign, "UTF-8") + "]" ) ping_frame = bytearray(self.length_sig0_frame) ping_frame[:1] = bytes([FR_TYPE.PING.value]) ping_frame[1:4] = Station.dxcallsign_crc ping_frame[4:7] = helpers.get_crc_24(mycallsign) ping_frame[7:13] = helpers.callsign_to_bytes(mycallsign) if TNC.enable_fsk: self.log.info("[TNC] ENABLE FSK", state=TNC.enable_fsk) self.enqueue_frame_for_tx([ping_frame], c2_mode=FREEDV_MODE.fsk_ldpc_0.value) else: self.enqueue_frame_for_tx([ping_frame], c2_mode=FREEDV_MODE.sig0.value) def received_ping(self, data_in: bytes) -> None: """ Called if we received a ping Args: data_in:bytes: """ dxcallsign_crc = bytes(data_in[4:7]) dxcallsign = helpers.bytes_to_callsign(bytes(data_in[7:13])) # check if callsign ssid override valid, mycallsign = helpers.check_callsign(self.mycallsign, data_in[1:4]) if not valid: # PING packet not for me. self.log.debug("[TNC] received_ping: ping not for this station.") return Station.dxcallsign_crc = dxcallsign_crc Station.dxcallsign = dxcallsign self.log.info( "[TNC] PING REQ [" + str(mycallsign, "UTF-8") + "] <<< [" + str(dxcallsign, "UTF-8") + "]", snr=ModemParam.snr, ) Station.dxgrid = b'------' helpers.add_to_heard_stations( dxcallsign, Station.dxgrid, "PING", ModemParam.snr, ModemParam.frequency_offset, HamlibParam.hamlib_frequency, ) self.send_data_to_socket_queue( freedata="tnc-message", ping="received", uuid=str(uuid.uuid4()), timestamp=int(time.time()), dxgrid=str(Station.dxgrid, "UTF-8"), dxcallsign=str(dxcallsign, "UTF-8"), mycallsign=str(mycallsign, "UTF-8"), snr=str(ModemParam.snr), ) if TNC.respond_to_call: self.transmit_ping_ack() def transmit_ping_ack(self): """ transmit a ping ack frame called by def received_ping """ ping_frame = bytearray(self.length_sig0_frame) ping_frame[:1] = bytes([FR_TYPE.PING_ACK.value]) ping_frame[1:4] = Station.dxcallsign_crc ping_frame[4:7] = Station.mycallsign_crc ping_frame[7:11] = helpers.encode_grid(Station.mygrid.decode("UTF-8")) ping_frame[13:14] = helpers.snr_to_bytes(ModemParam.snr) if TNC.enable_fsk: self.enqueue_frame_for_tx([ping_frame], c2_mode=FREEDV_MODE.fsk_ldpc_0.value) else: self.enqueue_frame_for_tx([ping_frame], c2_mode=FREEDV_MODE.sig0.value) def received_ping_ack(self, data_in: bytes) -> None: """ Called if a PING ack has been received Args: data_in:bytes: """ # check if we received correct ping # check if callsign ssid override _valid, mycallsign = helpers.check_callsign(self.mycallsign, data_in[1:4]) if _valid: Station.dxgrid = bytes(helpers.decode_grid(data_in[7:11]), "UTF-8") dxsnr = helpers.snr_from_bytes(data_in[13:14]) self.send_data_to_socket_queue( freedata="tnc-message", ping="acknowledge", uuid=str(uuid.uuid4()), timestamp=int(time.time()), dxgrid=str(Station.dxgrid, "UTF-8"), dxcallsign=str(Station.dxcallsign, "UTF-8"), mycallsign=str(mycallsign, "UTF-8"), snr=str(ModemParam.snr), dxsnr=str(dxsnr) ) # combined_snr = own rx snr / snr on dx side combined_snr = f"{ModemParam.snr}/{dxsnr}" helpers.add_to_heard_stations( Station.dxcallsign, Station.dxgrid, "PING-ACK", combined_snr, ModemParam.frequency_offset, HamlibParam.hamlib_frequency, ) self.log.info( "[TNC] PING ACK [" + str(mycallsign, "UTF-8") + "] >|< [" + str(Station.dxcallsign, "UTF-8") + "]", snr=ModemParam.snr, dxsnr=dxsnr, ) TNC.tnc_state = "IDLE" else: self.log.info( "[TNC] FOREIGN PING ACK [" + str(self.mycallsign, "UTF-8") + "] ??? [" + str(bytes(data_in[4:7]), "UTF-8") + "]", snr=ModemParam.snr, ) def stop_transmission(self) -> None: """ Force a stop of the running transmission """ self.log.warning("[TNC] Stopping transmission!") TNC.tnc_state = "IDLE" ARQ.arq_state = False self.send_data_to_socket_queue( freedata="tnc-message", arq="transmission", status="stopped", mycallsign=str(self.mycallsign, 'UTF-8'), dxcallsign=str(self.dxcallsign, 'UTF-8') ) stop_frame = bytearray(self.length_sig0_frame) stop_frame[:1] = bytes([FR_TYPE.ARQ_STOP.value]) stop_frame[1:4] = Station.dxcallsign_crc stop_frame[4:7] = Station.mycallsign_crc # TODO: Not sure if we really need the session id when disconnecting # stop_frame[1:2] = self.session_id stop_frame[7:13] = helpers.callsign_to_bytes(self.mycallsign) self.enqueue_frame_for_tx([stop_frame], c2_mode=FREEDV_MODE.sig1.value, copies=3, repeat_delay=0) self.arq_cleanup() def received_stop_transmission( self, data_in: bytes ) -> None: # pylint: disable=unused-argument """ Received a transmission stop """ self.log.warning("[TNC] Stopping transmission!") TNC.tnc_state = "IDLE" ARQ.arq_state = False self.send_data_to_socket_queue( freedata="tnc-message", arq="transmission", status="stopped", mycallsign=str(self.mycallsign, 'UTF-8'), dxcallsign=str(self.dxcallsign, 'UTF-8'), uuid=self.transmission_uuid ) self.arq_cleanup() # ----------- BROADCASTS def run_beacon(self) -> None: """ Controlling function for running a beacon Args: self: arq class Returns: """ try: while True: threading.Event().wait(0.5) while Beacon.beacon_state: if ( not ARQ.arq_session and not self.arq_file_transfer and not Beacon.beacon_pause #and not ModemParam.channel_busy and TNC.tnc_state not in ["BUSY"] and not ARQ.arq_state ): self.send_data_to_socket_queue( freedata="tnc-message", beacon="transmitting", dxcallsign="None", interval=self.beacon_interval, ) self.log.info( "[TNC] Sending beacon!", interval=self.beacon_interval ) beacon_frame = bytearray(self.length_sig0_frame) beacon_frame[:1] = bytes([FR_TYPE.BEACON.value]) beacon_frame[1:7] = helpers.callsign_to_bytes(self.mycallsign) beacon_frame[7:11] = helpers.encode_grid(Station.mygrid.decode("UTF-8")) if TNC.enable_fsk: self.log.info("[TNC] ENABLE FSK", state=TNC.enable_fsk) self.enqueue_frame_for_tx( [beacon_frame], c2_mode=FREEDV_MODE.fsk_ldpc_0.value, ) else: self.enqueue_frame_for_tx([beacon_frame], c2_mode=FREEDV_MODE.sig0.value, copies=1, repeat_delay=0) self.beacon_interval_timer = time.time() + self.beacon_interval while ( time.time() < self.beacon_interval_timer and Beacon.beacon_state and not Beacon.beacon_pause ): threading.Event().wait(0.01) except Exception as err: self.log.debug("[TNC] run_beacon: ", exception=err) def received_beacon(self, data_in: bytes) -> None: """ Called if we received a beacon Args: data_in:bytes: """ # here we add the received station to the heard stations buffer beacon_callsign = helpers.bytes_to_callsign(bytes(data_in[1:7])) Station.dxgrid = bytes(helpers.decode_grid(data_in[7:11]), "UTF-8") self.send_data_to_socket_queue( freedata="tnc-message", beacon="received", uuid=str(uuid.uuid4()), timestamp=int(time.time()), dxcallsign=str(beacon_callsign, "UTF-8"), dxgrid=str(Station.dxgrid, "UTF-8"), snr=str(ModemParam.snr), ) self.log.info( "[TNC] BEACON RCVD [" + str(beacon_callsign, "UTF-8") + "][" + str(Station.dxgrid, "UTF-8") + "] ", snr=ModemParam.snr, ) helpers.add_to_heard_stations( beacon_callsign, Station.dxgrid, "BEACON", ModemParam.snr, ModemParam.frequency_offset, HamlibParam.hamlib_frequency, ) def transmit_cq(self) -> None: """ Transmit a CQ Args: self Returns: Nothing """ self.log.info("[TNC] CQ CQ CQ") self.send_data_to_socket_queue( freedata="tnc-message", cq="transmitting", mycallsign=str(self.mycallsign, "UTF-8"), dxcallsign="None", ) cq_frame = bytearray(self.length_sig0_frame) cq_frame[:1] = bytes([FR_TYPE.CQ.value]) cq_frame[1:7] = helpers.callsign_to_bytes(self.mycallsign) cq_frame[7:11] = helpers.encode_grid(Station.mygrid.decode("UTF-8")) self.log.debug("[TNC] CQ Frame:", data=[cq_frame]) if TNC.enable_fsk: self.log.info("[TNC] ENABLE FSK", state=TNC.enable_fsk) self.enqueue_frame_for_tx([cq_frame], c2_mode=FREEDV_MODE.fsk_ldpc_0.value) else: self.enqueue_frame_for_tx([cq_frame], c2_mode=FREEDV_MODE.sig0.value, copies=1, repeat_delay=0) # FIXME: Remove or change this in later versions for full CW support # TNC.transmitting = True # modem.MODEM_TRANSMIT_QUEUE.put(["morse", 1, 0, "123"]) def received_cq(self, data_in: bytes) -> None: """ Called when we receive a CQ frame Args: data_in:bytes: Returns: Nothing """ # here we add the received station to the heard stations buffer dxcallsign = helpers.bytes_to_callsign(bytes(data_in[1:7])) self.log.debug("[TNC] received_cq:", dxcallsign=dxcallsign) Station.dxgrid = bytes(helpers.decode_grid(data_in[7:11]), "UTF-8") self.send_data_to_socket_queue( freedata="tnc-message", cq="received", mycallsign=str(self.mycallsign, "UTF-8"), dxcallsign=str(dxcallsign, "UTF-8"), dxgrid=str(Station.dxgrid, "UTF-8"), ) self.log.info( "[TNC] CQ RCVD [" + str(dxcallsign, "UTF-8") + "][" + str(Station.dxgrid, "UTF-8") + "] ", snr=ModemParam.snr, ) helpers.add_to_heard_stations( dxcallsign, Station.dxgrid, "CQ CQ CQ", ModemParam.snr, ModemParam.frequency_offset, HamlibParam.hamlib_frequency, ) if TNC.respond_to_cq and TNC.respond_to_call: self.transmit_qrv(dxcallsign) def transmit_qrv(self, dxcallsign: bytes) -> None: """ Called when we send a QRV frame Args: self, dxcallsign """ # Sleep a random amount of time before responding to make it more likely to be # heard when many stations respond. Each DATAC0 frame is 0.44 sec (440ms) in # duration, plus overhead. Set the wait interval to be random between 0 and # self.duration_sig1_frame * 4 == 4 slots # in self.duration_sig1_frame increments. # FIXME: This causes problems when running ctests - we need to figure out why if not TESTMODE: self.log.info("[TNC] Waiting for QRV slot...") helpers.wait(randrange(0, int(self.duration_sig1_frame * 4), self.duration_sig1_frame * 10 // 10.0)) self.send_data_to_socket_queue( freedata="tnc-message", qrv="transmitting", dxcallsign=str(dxcallsign, "UTF-8"), ) self.log.info("[TNC] Sending QRV!") qrv_frame = bytearray(self.length_sig0_frame) qrv_frame[:1] = bytes([FR_TYPE.QRV.value]) qrv_frame[1:7] = helpers.callsign_to_bytes(self.mycallsign) qrv_frame[7:11] = helpers.encode_grid(Station.mygrid.decode("UTF-8")) qrv_frame[11:12] = helpers.snr_to_bytes(ModemParam.snr) if TNC.enable_fsk: self.log.info("[TNC] ENABLE FSK", state=TNC.enable_fsk) self.enqueue_frame_for_tx([qrv_frame], c2_mode=FREEDV_MODE.fsk_ldpc_0.value) else: self.enqueue_frame_for_tx([qrv_frame], c2_mode=FREEDV_MODE.sig0.value, copies=1, repeat_delay=0) def received_qrv(self, data_in: bytes) -> None: """ Called when we receive a QRV frame Args: data_in:bytes: """ # here we add the received station to the heard stations buffer dxcallsign = helpers.bytes_to_callsign(bytes(data_in[1:7])) Station.dxgrid = bytes(helpers.decode_grid(data_in[7:11]), "UTF-8") dxsnr = helpers.snr_from_bytes(data_in[11:12]) combined_snr = f"{ModemParam.snr}/{dxsnr}" self.send_data_to_socket_queue( freedata="tnc-message", qrv="received", dxcallsign=str(dxcallsign, "UTF-8"), dxgrid=str(Station.dxgrid, "UTF-8"), snr=str(ModemParam.snr), dxsnr=str(dxsnr) ) self.log.info( "[TNC] QRV RCVD [" + str(dxcallsign, "UTF-8") + "][" + str(Station.dxgrid, "UTF-8") + "] ", snr=ModemParam.snr, dxsnr=dxsnr ) helpers.add_to_heard_stations( dxcallsign, Station.dxgrid, "QRV", combined_snr, ModemParam.frequency_offset, HamlibParam.hamlib_frequency, ) def received_is_writing(self, data_in: bytes) -> None: """ Called when we receive a IS WRITING frame Args: data_in:bytes: """ # here we add the received station to the heard stations buffer dxcallsign = helpers.bytes_to_callsign(bytes(data_in[1:7])) self.send_data_to_socket_queue( freedata="tnc-message", fec="is_writing", dxcallsign=str(dxcallsign, "UTF-8") ) self.log.info( "[TNC] IS_WRITING RCVD [" + str(dxcallsign, "UTF-8") + "] ", ) # ------------ CALCULATE TRANSFER RATES def calculate_transfer_rate_rx( self, rx_start_of_transmission: float, receivedbytes: int ) -> list: """ Calculate transfer rate for received data Args: rx_start_of_transmission:float: receivedbytes:int: Returns: List of: bits_per_second: float, bytes_per_minute: float, transmission_percent: float """ try: if ARQ.total_bytes == 0: ARQ.total_bytes = 1 ARQ.arq_transmission_percent = min( int( ( receivedbytes * ARQ.arq_compression_factor / ARQ.total_bytes ) * 100 ), 100, ) transmissiontime = time.time() - self.rx_start_of_transmission if receivedbytes > 0: ARQ.arq_bits_per_second = int((receivedbytes * 8) / transmissiontime) ARQ.bytes_per_minute = int( receivedbytes / (transmissiontime / 60) ) ARQ.arq_seconds_until_finish = int(((ARQ.total_bytes - receivedbytes) / ( ARQ.bytes_per_minute * ARQ.arq_compression_factor)) * 60) - 20 # offset because of frame ack/nack speed_chart = {"snr": ModemParam.snr, "bpm": ARQ.bytes_per_minute, "timestamp": int(time.time())} # check if data already in list if speed_chart not in ARQ.speed_list: ARQ.speed_list.append(speed_chart) else: ARQ.arq_bits_per_second = 0 ARQ.bytes_per_minute = 0 ARQ.arq_seconds_until_finish = 0 except Exception as err: self.log.error(f"[TNC] calculate_transfer_rate_rx: Exception: {err}") ARQ.arq_transmission_percent = 0.0 ARQ.arq_bits_per_second = 0 ARQ.bytes_per_minute = 0 return [ ARQ.arq_bits_per_second, ARQ.bytes_per_minute, ARQ.arq_transmission_percent, ] def reset_statistics(self) -> None: """ Reset statistics """ # reset ARQ statistics ARQ.bytes_per_minute_burst = 0 ARQ.bytes_per_minute = 0 ARQ.arq_bits_per_second_burst = 0 ARQ.arq_bits_per_second = 0 ARQ.arq_transmission_percent = 0 ARQ.total_bytes = 0 ARQ.arq_seconds_until_finish = 0 def calculate_transfer_rate_tx( self, tx_start_of_transmission: float, sentbytes: int, tx_buffer_length: int ) -> list: """ Calculate transfer rate for transmission Args: tx_start_of_transmission:float: sentbytes:int: tx_buffer_length:int: Returns: List of: bits_per_second: float, bytes_per_minute: float, transmission_percent: float """ try: ARQ.arq_transmission_percent = min( int((sentbytes / tx_buffer_length) * 100), 100 ) transmissiontime = time.time() - tx_start_of_transmission if sentbytes > 0: ARQ.arq_bits_per_second = int((sentbytes * 8) / transmissiontime) ARQ.bytes_per_minute = int(sentbytes / (transmissiontime / 60)) ARQ.arq_seconds_until_finish = int(((tx_buffer_length - sentbytes) / ( ARQ.bytes_per_minute * ARQ.arq_compression_factor)) * 60) speed_chart = {"snr": self.burst_ack_snr, "bpm": ARQ.bytes_per_minute, "timestamp": int(time.time())} # check if data already in list if speed_chart not in ARQ.speed_list: ARQ.speed_list.append(speed_chart) else: ARQ.arq_bits_per_second = 0 ARQ.bytes_per_minute = 0 ARQ.arq_seconds_until_finish = 0 except Exception as err: self.log.error(f"[TNC] calculate_transfer_rate_tx: Exception: {err}") ARQ.arq_transmission_percent = 0.0 ARQ.arq_bits_per_second = 0 ARQ.bytes_per_minute = 0 return [ ARQ.arq_bits_per_second, ARQ.bytes_per_minute, ARQ.arq_transmission_percent, ] # ----------------------CLEANUP AND RESET FUNCTIONS def arq_cleanup(self) -> None: """ Cleanup function which clears all ARQ states """ if TESTMODE: self.log.debug("[TNC] TESTMODE: arq_cleanup: Not performing cleanup.") return self.log.debug("[TNC] arq_cleanup") # wait a second for smoother arq behaviour helpers.wait(1.0) self.rx_frame_bof_received = False self.rx_frame_eof_received = False self.burst_ack = False self.rpt_request_received = False self.burst_rpt_counter = 0 self.data_frame_ack_received = False ARQ.rx_burst_buffer = [] ARQ.rx_frame_buffer = b"" self.burst_ack_snr = 0 self.arq_burst_last_payload = 0 self.rx_n_frame_of_burst = 0 self.rx_n_frames_per_burst = 0 # reset modem receiving state to reduce cpu load modem.RECEIVE_SIG0 = True modem.RECEIVE_SIG1 = False modem.RECEIVE_DATAC1 = False modem.RECEIVE_DATAC3 = False modem.RECEIVE_DATAC4 = False # modem.RECEIVE_FSK_LDPC_0 = False modem.RECEIVE_FSK_LDPC_1 = False # reset buffer overflow counter AudioParam.buffer_overflow_counter = [0, 0, 0, 0, 0] self.is_IRS = False self.burst_nack = False self.burst_nack_counter = 0 self.frame_nack_counter = 0 self.frame_received_counter = 0 self.speed_level = len(self.mode_list) - 1 ARQ.arq_speed_level = self.speed_level # low bandwidth mode indicator self.received_LOW_BANDWIDTH_MODE = False # reset retry counter for rx channel / burst self.n_retries_per_burst = 0 # reset max retries possibly overriden by api self.session_connect_max_retries = 10 self.data_channel_max_retries = 10 # we need to keep these values if in ARQ_SESSION if not ARQ.arq_session: TNC.tnc_state = "IDLE" self.dxcallsign = b"AA0AA-0" self.mycallsign = Station.mycallsign self.session_id = bytes(1) ARQ.arq_session_state = "disconnected" ARQ.speed_list = [] ARQ.arq_state = False self.arq_file_transfer = False Beacon.beacon_pause = False # reset beacon interval timer for not directly starting beacon after ARQ self.beacon_interval_timer = time.time() + self.beacon_interval def arq_reset_ack(self, state: bool) -> None: """ Funktion for resetting acknowledge states Args: state:bool: """ self.burst_ack = state self.rpt_request_received = state self.data_frame_ack_received = state def set_listening_modes(self, enable_sig0: bool, enable_sig1: bool, mode: int) -> None: # sourcery skip: extract-duplicate-method """ Function for setting the data modes we are listening to for saving cpu power Args: enable_sig0:int: Enable/Disable signalling mode 0 enable_sig1:int: Enable/Disable signalling mode 1 mode:int: Codec2 mode to listen for """ # set modes we want to listen to modem.RECEIVE_SIG0 = enable_sig0 modem.RECEIVE_SIG1 = enable_sig1 if mode == codec2.FREEDV_MODE.datac1.value: modem.RECEIVE_DATAC1 = True modem.RECEIVE_DATAC3 = False modem.RECEIVE_DATAC4 = False modem.RECEIVE_FSK_LDPC_1 = False self.log.debug("[TNC] Changing listening data mode", mode="datac1") elif mode == codec2.FREEDV_MODE.datac3.value: modem.RECEIVE_DATAC1 = False modem.RECEIVE_DATAC3 = True modem.RECEIVE_DATAC4 = False modem.RECEIVE_FSK_LDPC_1 = False self.log.debug("[TNC] Changing listening data mode", mode="datac3") elif mode == codec2.FREEDV_MODE.datac4.value: modem.RECEIVE_DATAC1 = False modem.RECEIVE_DATAC3 = False modem.RECEIVE_DATAC4 = True modem.RECEIVE_FSK_LDPC_1 = False self.log.debug("[TNC] Changing listening data mode", mode="datac4") elif mode == codec2.FREEDV_MODE.fsk_ldpc_1.value: modem.RECEIVE_DATAC1 = False modem.RECEIVE_DATAC3 = False modem.RECEIVE_DATAC4 = False modem.RECEIVE_FSK_LDPC_1 = True self.log.debug("[TNC] Changing listening data mode", mode="fsk_ldpc_1") else: modem.RECEIVE_DATAC1 = True modem.RECEIVE_DATAC3 = True modem.RECEIVE_DATAC4 = True modem.RECEIVE_FSK_LDPC_1 = True self.log.debug( "[TNC] Changing listening data mode", mode="datac1/datac3/fsk_ldpc" ) # ------------------------- WATCHDOG FUNCTIONS FOR TIMER def watchdog(self) -> None: """Author: DJ2LS Watchdog master function. From here, "pet" the watchdogs """ while True: threading.Event().wait(0.1) self.data_channel_keep_alive_watchdog() self.burst_watchdog() self.arq_session_keep_alive_watchdog() def burst_watchdog(self) -> None: """ Watchdog which checks if we are running into a connection timeout DATA BURST """ # IRS SIDE # TODO: We need to redesign this part for cleaner state handling # Return if not ARQ STATE and not ARQ SESSION STATE as they are different use cases if ( not ARQ.arq_state and ARQ.arq_session_state != "connected" or not self.is_IRS ): return # get modem error state modem_error_state = modem.get_modem_error_state() # We want to reach this state only if connected ( == return above not called ) if self.rx_n_frames_per_burst > 1: # uses case for IRS: reduce time for waiting by counting "None" in burst buffer frames_left = ARQ.rx_burst_buffer.count(None) elif self.rx_n_frame_of_burst == 0 and self.rx_n_frames_per_burst == 0: # use case for IRS: We didn't receive a burst yet, because the first one got lost # in this case we don't have any information about the expected burst length # we must assume, we are getting a burst with max_n_frames_per_burst frames_left = self.max_n_frames_per_burst else: frames_left = 1 # make sure we don't have a 0 here for avoiding too short timeouts if frames_left == 0: frames_left = 1 timeout = self.burst_last_received + (self.time_list[self.speed_level] * frames_left) # TODO: Enable this for development # print(f"timeout expected in:{round(timeout - time.time())} | frames left: {frames_left} of {self.rx_n_frames_per_burst} | speed level: {self.speed_level}") if timeout <= time.time() or modem_error_state: self.log.warning( "[TNC] Burst decoding error or timeout", attempt=self.n_retries_per_burst, max_attempts=self.rx_n_max_retries_per_burst, speed_level=self.speed_level, modem_error_state=modem_error_state ) print( f"frames_per_burst {self.rx_n_frame_of_burst} / {self.rx_n_frames_per_burst}, Repeats: {self.burst_rpt_counter} Nones: {ARQ.rx_burst_buffer.count(None)}") if self.rx_n_frames_per_burst > 1 and self.burst_rpt_counter < 3 and ARQ.rx_burst_buffer.count(None) > 0: # reset self.burst_last_received self.burst_last_received = time.time() + self.time_list[self.speed_level] * frames_left self.burst_rpt_counter += 1 self.send_retransmit_request_frame() else: # reset self.burst_last_received self.burst_last_received = time.time() + self.time_list[self.speed_level] # reduce speed level if nack counter increased self.frame_received_counter = 0 self.burst_nack_counter += 1 if self.burst_nack_counter >= 2: self.burst_nack_counter = 0 self.speed_level = max(self.speed_level - 1, 0) ARQ.arq_speed_level = self.speed_level # TODO: Create better mechanisms for handling n frames per burst for bad channels # reduce frames per burst if self.burst_rpt_counter >= 2: tx_n_frames_per_burst = max(self.rx_n_frames_per_burst - 1, 1) else: tx_n_frames_per_burst = self.rx_n_frames_per_burst # Update modes we are listening to self.set_listening_modes(True, True, self.mode_list[self.speed_level]) # TODO: Does SNR make sense for NACK if we dont have an actual SNR information? self.send_burst_nack_frame_watchdog(0, tx_n_frames_per_burst) # Update data_channel timestamp # TODO: Disabled this one for testing. # self.data_channel_last_received = time.time() self.n_retries_per_burst += 1 else: # print((self.data_channel_last_received + self.time_list[self.speed_level])-time.time()) pass if self.n_retries_per_burst >= self.rx_n_max_retries_per_burst: self.stop_transmission() def data_channel_keep_alive_watchdog(self) -> None: """ watchdog which checks if we are running into a connection timeout DATA CHANNEL """ # and not static.ARQ_SEND_KEEP_ALIVE: if ARQ.arq_state and TNC.tnc_state == "BUSY": threading.Event().wait(0.01) if ( self.data_channel_last_received + self.transmission_timeout > time.time() ): timeleft = int((self.data_channel_last_received + self.transmission_timeout) - time.time()) ARQ.arq_seconds_until_timeout = timeleft if timeleft % 10 == 0: self.log.debug("Time left until channel timeout", seconds=timeleft) # threading.Event().wait(5) # print(self.data_channel_last_received + self.transmission_timeout - time.time()) # pass else: # Clear the timeout timestamp self.data_channel_last_received = 0 self.log.info( "[TNC] DATA [" + str(self.mycallsign, "UTF-8") + "]<>[" + str(Station.dxcallsign, "UTF-8") + "]" ) self.send_data_to_socket_queue( freedata="tnc-message", arq="transmission", status="failed", uuid=self.transmission_uuid, mycallsign=str(self.mycallsign, 'UTF-8'), dxcallsign=str(self.dxcallsign, 'UTF-8'), irs=helpers.bool_to_string(self.is_IRS) ) self.arq_cleanup() def arq_session_keep_alive_watchdog(self) -> None: """ watchdog which checks if we are running into a connection timeout ARQ SESSION """ if ( ARQ.arq_session and TNC.tnc_state == "BUSY" and not self.arq_file_transfer ): if self.arq_session_last_received + self.arq_session_timeout > time.time(): threading.Event().wait(0.01) else: self.log.info( "[TNC] SESSION [" + str(self.mycallsign, "UTF-8") + "]<>[" + str(self.dxcallsign, "UTF-8") + "]" ) self.send_data_to_socket_queue( freedata="tnc-message", arq="session", status="failed", reason="timeout", mycallsign=str(self.mycallsign, 'UTF-8'), dxcallsign=str(self.dxcallsign, 'UTF-8'), ) self.close_session() def heartbeat(self) -> None: """ Heartbeat thread which auto pauses and resumes the heartbeat signal when in an arq session """ while True: threading.Event().wait(0.01) # additional check for smoother stopping if heartbeat transmission while not self.arq_file_transfer: threading.Event().wait(0.01) if ( ARQ.arq_session and self.IS_ARQ_SESSION_MASTER and ARQ.arq_session_state == "connected" # and not self.arq_file_transfer ): threading.Event().wait(1) self.transmit_session_heartbeat() threading.Event().wait(2) def send_test_frame(self) -> None: """Send an empty test frame""" test_frame = bytearray(126) test_frame[:1] = bytes([FR_TYPE.TEST_FRAME.value]) self.enqueue_frame_for_tx( frame_to_tx=[test_frame], c2_mode=FREEDV_MODE.datac13.value ) def send_fec(self, mode, wakeup, payload, mycallsign): """Send an empty test frame""" print(wakeup) print(payload) print(mycallsign) mode_int = codec2.freedv_get_mode_value_by_name(mode) payload_per_frame = modem.get_bytes_per_frame(mode_int) - 2 fec_payload_length = payload_per_frame - 1 if wakeup: mode_int_wakeup = codec2.freedv_get_mode_value_by_name("sig0") payload_per_wakeup_frame = modem.get_bytes_per_frame(mode_int_wakeup) - 2 fec_wakeup_frame = bytearray(payload_per_wakeup_frame) fec_wakeup_frame[:1] = bytes([FR_TYPE.FEC_WAKEUP.value]) fec_wakeup_frame[1:7] = helpers.callsign_to_bytes(mycallsign) fec_wakeup_frame[7:8] = bytes([mode_int]) fec_wakeup_frame[8:9] = bytes([1]) # n payload bursts print(mode_int_wakeup) self.enqueue_frame_for_tx( frame_to_tx=[fec_wakeup_frame], c2_mode=codec2.FREEDV_MODE["sig1"].value ) time.sleep(1) fec_frame = bytearray(payload_per_frame) fec_frame[:1] = bytes([FR_TYPE.FEC.value]) fec_frame[1:payload_per_frame] = bytes(payload[:fec_payload_length]) self.enqueue_frame_for_tx( frame_to_tx=[fec_frame], c2_mode=codec2.FREEDV_MODE[mode].value ) def send_fec_is_writing(self, mycallsign) -> None: """Send an fec is writing frame""" fec_frame = bytearray(14) fec_frame[:1] = bytes([FR_TYPE.IS_WRITING.value]) fec_frame[1:7] = helpers.callsign_to_bytes(mycallsign) # send burst only if channel not busy - but without waiting # otherwise burst will be dropped if not ModemParam.channel_busy and not TNC.transmitting: self.enqueue_frame_for_tx( frame_to_tx=[fec_frame], c2_mode=codec2.FREEDV_MODE["sig0"].value ) else: return False def save_data_to_folder(self, transmission_uuid, timestamp, mycallsign, dxcallsign, dxgrid, data_frame ): """ Save received data to folder Also supports chat messages """ try: self.log.info("[TNC] ARQ | RX | saving data to folder") mycallsign = str(mycallsign, "UTF-8") dxcallsign = str(dxcallsign, "UTF-8") folder_path = "received" if not os.path.exists(folder_path): os.makedirs(folder_path) callsign_path = f"{mycallsign}_{dxcallsign}" if not os.path.exists(f"{folder_path}/{callsign_path}"): os.makedirs(f"{folder_path}/{callsign_path}") split_char = b"\0;\1;" n_objects = 9 decoded_data = data_frame.split(split_char) # if we have a false positive in case our split_char is available in data # lets stick the data together, so we are not loosing it if len(decoded_data) > n_objects: file_data = b''.join(decoded_data[n_objects:]) # slice is crashing nuitka # decoded_data = [*decoded_data[:n_objects], file_data] decoded_data = decoded_data[:n_objects] + [file_data] if decoded_data[0] in [b'm']: checksum_delivered = str(decoded_data[2], "utf-8").lower() # transmission_uuid = decoded_data[3] message = decoded_data[5] filename = decoded_data[6] # filetype = decoded_data[7] # timestamp = decoded_data[4] data = decoded_data[8] else: message = b'' filename = b'' # save file to folder if filename not in [b'', b'undefined']: # doing crc check crc = helpers.get_crc_32(data).hex().lower() validity = checksum_delivered == crc self.log.info( "[TNC] ARQ | RX | checking data crc", crc_delivered=checksum_delivered, crc_calculated=crc, valid=validity, ) filename = str(filename, "UTF-8") filename_complex = f"{timestamp}_{transmission_uuid}_{filename}" with open(f"{folder_path}/{callsign_path}/{filename_complex}", "wb") as file: file.write(data) if message not in [b'', b'undefined']: # save message to folder message_name = f"{timestamp}_{transmission_uuid}_msg.txt" with open(f"{folder_path}/{callsign_path}/{message_name}", "wb") as file: file.write(message) except Exception as e: self.log.error("[TNC] error saving data to folder", e=e)