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FreeDATA/modem/data_handler.py

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# -*- 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 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 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
from modem_frametypes 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, config, event_queue, states) -> None:
self.states = states
self.stats = stats.stats(config, event_queue, states)
self.event_queue = event_queue
self.mycallsign = config['STATION']['mycall']
self.ssid_list = config['STATION']['ssid_list']
self.mycallsign_crc = helpers.get_crc_24(self.mycallsign)
self.mygrid = config['STATION']['mygrid']
self.enable_fsk = config['MODEM']['enable_fsk']
self.respond_to_cq = config['MODEM']['respond_to_cq']
self.enable_hmac = config['MODEM']['enable_hmac']
self.enable_stats = config['STATION']['enable_stats']
self.enable_morse_identifier = config['MODEM']['enable_morse_identifier']
self.arq_rx_buffer_size = config['MODEM']['rx_buffer_size']
self.enable_experimental_features = False
# Enable general responding to channel openers for example
# this can be combined with a callsign blacklist for example
self.respond_to_call = True
# ARQ PROTOCOL VERSION
# v.5 - signalling frame uses datac0
# v.6 - signalling frame uses datac13
# v.7 - adjusting ARQ timeouts, not done yet
self.arq_protocol_version = 8
self.modem_frequency_offset = 0
self.dxcallsign = b"ZZ9YY-0"
self.dxcallsign_crc = b''
self.dxgrid = b''
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 frames
self.duration_datac4 = 5.17
self.duration_datac13 = 2.0
self.duration_datac1 = 4.18
self.duration_datac3 = 3.19
self.duration_sig0_frame = self.duration_datac13
self.duration_sig1_frame = self.duration_datac13
self.longest_duration = self.duration_datac4
# 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
self.arq_compression_factor = 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.arq_rx_burst_buffer = []
self.arq_rx_frame_buffer = b""
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(config, self.event_queue)
# Flag to indicate if we received a low bandwidth mode channel opener
self.received_LOW_BANDWIDTH_MODE = False
# flag to indicate if modem running in low bandwidth mode
self.low_bandwidth_mode = config["MODEM"]["enable_low_bandwidth_mode"]
self.data_channel_max_retries = 15
# event for checking arq_state_event
self.arq_state_event = threading.Event()
# -------------- 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 = [self.duration_datac4]
# --------------------- 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 = [self.duration_datac4, self.duration_datac3, self.duration_datac1]
# -------------- 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 self.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
self.states.set("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
self.channel_busy_timeout = 3 # time how long we want to wait until channel busy state overrides
self.datachannel_opening_interval = self.duration_sig1_frame + self.channel_busy_timeout + 1 # time between attempts when opening data channel
# 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_paused = False
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()
print(data)
# 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 self.states.is_arq_state or self.states.is_codec2_traffic:
self.log.debug(
"[Modem] TX DISPATCHER - waiting with processing command ",
is_arq_state=self.states.is_arq_state,
)
self.send_data_to_socket_queue(
freedata="modem-message",
command=data[0],
status="queued",
)
# now stay in while loop until state released
while self.states.is_arq_state or self.states.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"[Modem] 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]
self.states.set("is_beacon_running", True)
else:
self.states.set("is_beacon_running", 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(
"[Modem] 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
# [3] snr
self.process_data(
bytes_out=data[0], freedv=data[1], bytes_per_frame=data[2], snr=data[3]
)
def process_data(self, bytes_out, freedv, bytes_per_frame: int, snr) -> None:
"""
Process incoming data and decide what to do with the frame.
Args:
bytes_out:
freedv:
bytes_per_frame:
snr:
Returns:
"""
self.log.debug(
"[Modem] 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]), self.ssid_list)
_valid2, _ = helpers.check_callsign(self.mycallsign, bytes(bytes_out[2:5]), self.ssid_list)
# 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"[Modem] {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)
self.log.debug("[Modem] 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 self.arq_rx_burst_buffer.count(None) <= 1 or (frame+1) == n_frames_per_burst:
# self.log.debug(f"[Modem] 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("[Modem] TESTFRAME RECEIVED", frame=bytes_out[:])
# Unknown frame type
else:
self.log.warning(
"[Modem] ARQ - other frame type", frametype=FR_TYPE(frametype).name
)
else:
# for debugging purposes to receive all data
self.log.debug(
"[Modem] 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 Modem
: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
"""
frame_type = FR_TYPE(int.from_bytes(frame_to_tx[0][:1], byteorder="big")).name
self.log.debug("[Modem] enqueue_frame_for_tx", c2_mode=FREEDV_MODE(c2_mode).name, data=frame_to_tx,
type=frame_type)
modem.MODEM_TRANSMIT_QUEUE.put([c2_mode, copies, repeat_delay, frame_to_tx])
# Wait while transmitting
while self.states.is_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="modem-message",
arq="received",
status="success",
uuid=self.transmission_uuid,
timestamp=timestamp,
mycallsign=str(self.mycallsign, "UTF-8"),
dxcallsign=str(self.dxcallsign, "UTF-8"),
dxgrid=str(self.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(self.dxcallsign, "UTF-8")
except Exception as e:
self.log.debug("[Modem] error adding callsigns to network message", e=e)
# run json dumps
json_data_out = json.dumps(jsondata)
self.log.debug("[Modem] send_data_to_socket_queue:", jsondata=json_data_out)
# finally push data to our network queue
# sock.SOCKET_QUEUE.put(json_data_out)
self.event_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(self.arq_rx_frame_buffer).to_bytes(4, byteorder="big")
# wait if we have a channel busy condition
if self.states.channel_busy:
self.channel_busy_handler()
# 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 if we have a channel busy condition
if self.states.channel_busy:
self.channel_busy_handler()
# Transmit frame
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.
missing_frames = [
frame + 1
for frame, element in enumerate(self.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("[Modem] 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(self.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 if we have a channel busy condition
if self.states.channel_busy:
self.channel_busy_handler()
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, 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
self.arq_rx_burst_buffer = []
# Create and send ACK frame
self.log.info("[Modem] 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(0)
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(self.arq_rx_frame_buffer).to_bytes(4, byteorder="big")
# wait if we have a channel busy condition
if self.states.channel_busy:
self.channel_busy_handler()
# 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] = self.dxcallsign_crc
# wait if we have a channel busy condition
if self.states.channel_busy:
self.channel_busy_handler()
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 self.states.is_arq_state and not self.states.is_modem_busy:
self.log.warning("[Modem] wrong modem state - dropping data", is_arq_state=self.states.is_arq_state,
modem_state=self.states.is_modem_busy)
return
self.arq_file_transfer = True
self.states.set("is_modem_busy", True)
self.states.set("is_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(self.arq_rx_burst_buffer) != self.rx_n_frames_per_burst:
self.arq_rx_burst_buffer = [None] * self.rx_n_frames_per_burst
# Append data to rx burst buffer
self.arq_rx_burst_buffer[self.rx_n_frame_of_burst] = data_in[self.arq_burst_header_size:] # type: ignore
self.dxgrid = b'------'
helpers.add_to_heard_stations(
self.dxcallsign,
self.dxgrid,
"DATA",
snr,
self.modem_frequency_offset,
self.states.radio_frequency,
self.states.heard_stations
)
# 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 self.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 self.arq_rx_burst_buffer:
# self.arq_rx_frame_buffer += self.arq_rx_burst_buffer[i]
temp_burst_buffer += bytes(value) # type: ignore
# free up burst buffer
self.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 modem 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 self.arq_rx_frame_buffer.endswith(temp_burst_buffer[:246]) and len(temp_burst_buffer) >= 246:
self.log.warning(
"[Modem] 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(
"[Modem] ARQ | RX | wrong byteorder check failed", e=e
)
self.log.debug("[Modem] temp_burst_buffer", buffer=temp_burst_buffer)
self.log.debug("[Modem] self.arq_rx_frame_buffer", buffer=self.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 self.arq_rx_frame_buffer.endswith(temp_burst_buffer):
self.log.info(
"[Modem] 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
# self.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(self.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 = self.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:
self.arq_rx_frame_buffer = self.arq_rx_frame_buffer[
: search_position + get_position
]
self.log.warning(
"[Modem] ARQ | RX | replacing existing buffer data",
area=search_area,
pos=get_position,
)
else:
self.log.debug("[Modem] ARQ | RX | appending data to buffer")
self.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)
# TIMING TEST
#self.data_channel_last_received = int(time.time()) + 6 + 6
#self.burst_last_received = int(time.time()) + 6 + 6
self.data_channel_last_received = int(time.time())
self.burst_last_received = int(time.time())
# Create and send ACK frame
self.log.info("[Modem] ARQ | RX | SENDING ACK", finished=self.states.arq_seconds_until_finish,
bytesperminute=self.states.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(self.arq_rx_frame_buffer), snr
)
# send a network message with information
self.send_data_to_socket_queue(
freedata="modem-message",
arq="transmission",
status="receiving",
uuid=self.transmission_uuid,
percent=self.states.arq_transmission_percent,
bytesperminute=self.states.arq_bytes_per_minute,
compression=self.arq_compression_factor,
mycallsign=str(self.mycallsign, 'UTF-8'),
dxcallsign=str(self.dxcallsign, 'UTF-8'),
finished=self.states.arq_seconds_until_finish,
irs=helpers.bool_to_string(self.is_IRS)
)
else:
self.log.warning(
"[Modem] 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 = self.arq_rx_frame_buffer.find(self.data_frame_bof)
eof_position = self.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, snr)
if (
bof_position >= 0
and eof_position > 0
and None not in self.arq_rx_burst_buffer
):
self.log.debug(
"[Modem] 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 = self.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
self.states.set("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 self.enable_hmac:
self.log.info(
"[Modem] [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(
"[Modem] [HMAC] Disabled, using CRC",
)
self.arq_process_received_data_frame(data_frame, snr, signed=False)
else:
self.send_data_to_socket_queue(
freedata="modem-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(
"[Modem] ARQ | RX | DATA FRAME NOT SUCCESSFULLY RECEIVED!",
e="wrong crc",
expected=data_frame_crc.hex(),
received=data_frame_crc_received.hex(),
nacks=self.frame_nack_counter,
duration=duration,
bytesperminute=self.states.arq_bytes_per_minute,
compression=self.arq_compression_factor,
data=data_frame,
)
if self.enable_stats:
self.stats.push(frame_nack_counter=self.frame_nack_counter, status="wrong_crc", duration=duration)
self.log.info("[Modem] ARQ | RX | Sending NACK", finished=self.states.arq_seconds_until_finish,
bytesperminute=self.states.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, snr):
payload = self.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
self.states.set("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)
self.arq_compression_factor = compression_factor / 10
self.calculate_transfer_rate_rx(
self.rx_start_of_transmission, len(self.arq_rx_frame_buffer), snr
)
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 [self.states.channel_busy_slot]:
self.log.warning(
"[Modem] busy slot detection",
slots=self.states.channel_busy_slot,
mode_slots=mode_slots,
)
return False
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 snr >= self.snr_list[new_speed_level]:
self.speed_level = new_speed_level
else:
self.log.info("[Modem] ARQ | increasing speed level not possible because of SNR limit",
given_snr=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
self.states.set("arq_speed_level", self.speed_level)
# Update modes we are listening to
self.set_listening_modes(False, True, self.mode_list[self.speed_level])
self.log.debug(
"[Modem] calculated speed level",
speed_level=self.speed_level,
given_snr=snr,
min_snr=self.snr_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(self.arq_rx_frame_buffer), snr
)
self.log.info("[Modem] ARQ | RX | DATA FRAME SUCCESSFULLY RECEIVED", nacks=self.frame_nack_counter,
bytesperminute=self.states.arq_bytes_per_minute, total_bytes=self.states.arq_total_bytes, duration=duration, hmac_signed=signed)
# Decompress the data frame
data_frame_decompressed = lzma.decompress(data_frame)
self.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(self.arq_rx_buffer_size)
else:
# if full, free space by getting an item
self.log.info(
"[Modem] ARQ | RX | RX_BUFFER FULL - dropping old data",
buffer_size=RX_BUFFER.qsize(),
maxsize=int(self.arq_rx_buffer_size)
)
RX_BUFFER.get()
# add item to RX_BUFFER
self.log.info(
"[Modem] 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,
self.dxcallsign,
self.dxgrid,
base64_data,
signed,
self.arq_compression_factor,
self.states.arq_bytes_per_minute,
duration,
self.frame_nack_counter,
self.states.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(
"[Modem] ARQ | RX | error occurred when saving data!",
e=e,
uuid=self.transmission_uuid,
timestamp=timestamp,
dxcall=self.dxcallsign,
dxgrid=self.dxgrid,
data=base64_data
)
self.send_data_to_socket_queue(
freedata="modem-message",
arq="transmission",
status="received",
uuid=self.transmission_uuid,
percent=self.states.arq_transmission_percent,
bytesperminute=self.states.arq_bytes_per_minute,
compression=self.arq_compression_factor,
timestamp=timestamp,
finished=0,
mycallsign=str(self.mycallsign, "UTF-8"),
dxcallsign=str(self.dxcallsign, "UTF-8"),
dxgrid=str(self.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=self.states.arq_speed_list
)
if self.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(
"[Modem] 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(self.arq_rx_frame_buffer), snr
)
self.log.info(
"[Modem] | RX | DATACHANNEL ["
+ str(self.mycallsign, "UTF-8")
+ "]<< >>["
+ str(self.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
self.states.set("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)
self.arq_compression_factor = np.clip(compression_factor, 0, 255)
compression_factor = bytes([int(self.arq_compression_factor * 10)])
self.send_data_to_socket_queue(
freedata="modem-message",
arq="transmission",
status="transmitting",
uuid=self.transmission_uuid,
percent=self.states.arq_transmission_percent,
bytesperminute=self.states.arq_bytes_per_minute,
compression=self.arq_compression_factor,
finished=self.states.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(
"[Modem] | TX | DATACHANNEL",
Bytes=self.states.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("[Modem] 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("[Modem] 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("[Modem] 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 self.states.is_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)
self.states.set("arq_speed_level", self.speed_level)
data_mode = self.mode_list[self.speed_level]
self.log.debug(
"[Modem] 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("[Modem] 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("[Modem] 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("[Modem] ----- 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("[Modem] ----- data buffer offset:", iss_buffer_pos=bufferposition,
irs_bufferposition=self.irs_buffer_position)
# only adjust buffer position for experimental versions
if self.enable_experimental_features:
self.log.warning("[Modem] ----- data adjustment enabled!")
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("[Modem] tempbuffer:", tempbuffer=tempbuffer)
self.log.info(
"[Modem] 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 (
self.states.is_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(
"[Modem] 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(
"[Modem] 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(
"[Modem] 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
# self.states.is_arq_state == "DATA" --> when stopping transmission manually
if not self.states.is_arq_state:
self.log.debug(
"[Modem] 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(
"[Modem] ATTEMPT:",
retry=self.tx_n_retry_of_burst,
maxretries=self.tx_n_max_retries_per_burst,
)
# 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="modem-message",
arq="transmission",
status="transmitting",
uuid=self.transmission_uuid,
percent=self.states.arq_transmission_percent,
bytesperminute=self.states.arq_bytes_per_minute,
compression=self.arq_compression_factor,
finished=self.states.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("[Modem] 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("[Modem] 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="modem-message",
arq="transmission",
status="transmitted",
uuid=self.transmission_uuid,
percent=self.states.arq_transmission_percent,
bytesperminute=self.states.arq_bytes_per_minute,
compression=self.arq_compression_factor,
finished=self.states.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=self.states.arq_speed_list
)
self.log.info(
"[Modem] ARQ | TX | DATA TRANSMITTED!",
BytesPerMinute=self.states.arq_bytes_per_minute,
total_bytes=self.states.arq_total_bytes,
BitsPerSecond=self.states.arq_bits_per_second,
)
# 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="modem-message",
arq="transmission",
status="failed",
uuid=self.transmission_uuid,
percent=self.states.arq_transmission_percent,
bytesperminute=self.states.arq_bytes_per_minute,
compression=self.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=self.states.arq_speed_list
)
self.log.info(
"[Modem] ARQ | TX | TRANSMISSION FAILED OR TIME OUT!")
self.stop_transmission()
def burst_ack_nack_received(self, data_in: bytes, snr) -> 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 self.states.is_arq_state:
self.dxgrid = b'------'
helpers.add_to_heard_stations(
self.dxcallsign,
self.dxgrid,
"DATA",
snr,
self.modem_frequency_offset,
self.states.radio_frequency,
self.states.heard_stations
)
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 Modem 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(
"[Modem] 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")
self.states.set("arq_speed_level", self.speed_level)
def frame_ack_received(
self, data_in: bytes, snr # pylint: disable=unused-argument,
) -> None:
"""Received an ACK for a transmitted frame"""
# Process data only if we are in ARQ and BUSY state
if self.states.is_arq_state:
self.dxgrid = b'------'
helpers.add_to_heard_stations(
self.dxcallsign,
self.dxgrid,
"DATA",
snr,
self.modem_frequency_offset,
self.states.radio_frequency,
self.states.heard_stations
)
# Force data loops of Modem 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, snr # pylint: disable=unused-argument
) -> None:
"""
Received a NACK for a transmitted frame
Args:
data_in:bytes:
"""
self.log.warning("[Modem] ARQ FRAME NACK RECEIVED - cleanup!",
arq="transmission",
status="failed",
uuid=self.transmission_uuid,
percent=self.states.arq_transmission_percent,
bytesperminute=self.states.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=self.states.arq_speed_list
)
self.dxgrid = b'------'
helpers.add_to_heard_stations(
self.dxcallsign,
self.dxgrid,
"DATA",
snr,
self.modem_frequency_offset,
self.states.radio_frequency,
self.states.heard_stations
)
self.send_data_to_socket_queue(
freedata="modem-message",
arq="transmission",
status="failed",
uuid=self.transmission_uuid,
percent=self.states.arq_transmission_percent,
bytesperminute=self.states.arq_bytes_per_minute,
compression=self.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=self.states.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, snr):
"""
Repeat request frame received for transmitted frame
Args:
data_in:bytes:
"""
# Only process data if we are in ARQ and BUSY state
if not self.states.is_arq_state or not self.states.is_modem_busy:
return
self.dxgrid = b'------'
helpers.add_to_heard_stations(
self.dxcallsign,
self.dxgrid,
"DATA",
snr,
self.modem_frequency_offset,
self.states.radio_frequency,
self.states.heard_stations
)
self.log.info("[Modem] 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("[Modem] 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 `self.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
self.states.set("dxcallsign", self.dxcallsign)
self.dxcallsign_crc = helpers.get_crc_24(self.dxcallsign)
self.log.info(
"[Modem] SESSION ["
+ str(self.mycallsign, "UTF-8")
+ "]>> <<["
+ str(self.dxcallsign, "UTF-8")
+ "]",
self.states.arq_session_state,
)
# wait if we have a channel busy condition
if self.states.channel_busy:
self.channel_busy_handler()
self.open_session()
# wait until data channel is open
while not self.states.is_arq_session and not self.arq_session_timeout:
threading.Event().wait(0.01)
self.states.set("arq_session_state", "connecting")
self.send_data_to_socket_queue(
freedata="modem-message",
arq="session",
status="connecting",
mycallsign=str(self.mycallsign, 'UTF-8'),
dxcallsign=str(self.dxcallsign, 'UTF-8'),
)
if self.states.is_arq_session and self.states.arq_session_state == "connected":
# self.states.set("arq_session_state", "connected")
self.send_data_to_socket_queue(
freedata="modem-message",
arq="session",
status="connected",
mycallsign=str(self.mycallsign, 'UTF-8'),
dxcallsign=str(self.dxcallsign, 'UTF-8'),
)
return True
self.log.warning(
"[Modem] 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=self.states.arq_session_state,
)
self.states.set("arq_session_state", "failed")
self.send_data_to_socket_queue(
freedata="modem-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
self.states.set("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] = self.dxcallsign_crc
connection_frame[5:8] = self.mycallsign_crc
connection_frame[8:14] = helpers.callsign_to_bytes(self.mycallsign)
while not self.states.is_arq_session:
threading.Event().wait(0.01)
for attempt in range(self.session_connect_max_retries):
self.log.info(
"[Modem] SESSION ["
+ str(self.mycallsign, "UTF-8")
+ "]>>?<<["
+ str(self.dxcallsign, "UTF-8")
+ "]",
a=f"{str(attempt + 1)}/{str(self.session_connect_max_retries)}",
state=self.states.arq_session_state,
)
self.send_data_to_socket_queue(
freedata="modem-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 `self.states.is_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 self.states.is_arq_session:
return True
# Stop waiting and interrupt if data channel is getting closed while opening
if self.states.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 self.states.is_arq_session:
self.close_session()
return False
# Given the while condition, it will only exit when `self.states.is_arq_session` is True
self.send_data_to_socket_queue(
freedata="modem-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, snr) -> None:
"""
Received a session open request packet.
Args:
data_in:bytes:
"""
# if we don't want to respond to calls, return False
if not self.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 self.states.is_arq_session and self.IS_ARQ_SESSION_MASTER:
return False
self.IS_ARQ_SESSION_MASTER = False
self.states.set("arq_session_state", "connecting")
# Update arq_session timestamp
self.arq_session_last_received = int(time.time())
self.session_id = bytes(data_in[1:2])
self.dxcallsign_crc = bytes(data_in[5:8])
self.dxcallsign = helpers.bytes_to_callsign(bytes(data_in[8:14]))
self.states.set("dxcallsign", self.dxcallsign)
# check if callsign ssid override
valid, mycallsign = helpers.check_callsign(self.mycallsign, data_in[2:5], self.ssid_list)
self.mycallsign = mycallsign
self.dxgrid = b'------'
helpers.add_to_heard_stations(
self.dxcallsign,
self.dxgrid,
"DATA",
snr,
self.modem_frequency_offset,
self.states.radio_frequency,
self.states.heard_stations
)
self.log.info(
"[Modem] SESSION ["
+ str(self.mycallsign, "UTF-8")
+ "]>>|<<["
+ str(self.dxcallsign, "UTF-8")
+ "]",
self.states.arq_session_state,
)
self.states.is_arq_session = True
self.states.set("is_modem_busy", True)
self.send_data_to_socket_queue(
freedata="modem-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"""
self.states.set("arq_session_state", "disconnecting")
self.log.info(
"[Modem] SESSION ["
+ str(self.mycallsign, "UTF-8")
+ "]<<X>>["
+ str(self.dxcallsign, "UTF-8")
+ "]",
self.states.arq_session_state,
)
self.send_data_to_socket_queue(
freedata="modem-message",
arq="session",
status="close",
mycallsign=str(self.mycallsign, 'UTF-8'),
dxcallsign=str(self.dxcallsign, 'UTF-8'),
)
self.IS_ARQ_SESSION_MASTER = False
self.states.is_arq_session = False
# we need to send disconnect frame before doing arq cleanup
# we would lose our session id then
self.send_disconnect_frame()
# transmit morse identifier if configured
if self.enable_morse_identifier:
modem.MODEM_TRANSMIT_QUEUE.put(["morse", 1, 0, self.mycallsign])
self.arq_cleanup()
def received_session_close(self, data_in: bytes, snr):
"""
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]), self.ssid_list)
_valid_session = helpers.check_session_id(self.session_id, bytes(data_in[1:2]))
if (_valid_crc or _valid_session) and self.states.arq_session_state not in ["disconnected"]:
self.states.set("arq_session_state", "disconnected")
self.dxgrid = b'------'
helpers.add_to_heard_stations(
self.dxcallsign,
self.dxgrid,
"DATA",
snr,
self.modem_frequency_offset,
self.states.radio_frequency,
self.states.heard_stations
)
self.log.info(
"[Modem] SESSION ["
+ str(mycallsign, "UTF-8")
+ "]<<X>>["
+ str(self.dxcallsign, "UTF-8")
+ "]",
self.states.arq_session_state,
)
self.send_data_to_socket_queue(
freedata="modem-message",
arq="session",
status="close",
mycallsign=str(mycallsign, 'UTF-8'),
dxcallsign=str(self.dxcallsign, 'UTF-8'),
)
self.IS_ARQ_SESSION_MASTER = False
self.states.is_arq_session = False
self.arq_cleanup()
def transmit_session_heartbeat(self) -> None:
"""Send ARQ sesion heartbeat while connected"""
# self.states.is_arq_session = True
# self.states.set("is_modem_busy", True)
# self.states.set("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="modem-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, snr) -> 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]), self.ssid_list)
_valid_session = helpers.check_session_id(self.session_id, bytes(data_in[1:2]))
if _valid_crc or _valid_session and self.states.arq_session_state in ["connected", "connecting"]:
self.log.debug("[Modem] Received session heartbeat")
self.dxgrid = b'------'
helpers.add_to_heard_stations(
self.dxcallsign,
self.dxgrid,
"SESSION-HB",
snr,
self.modem_frequency_offset,
self.states.radio_frequency,
self.states.heard_stations
)
self.send_data_to_socket_queue(
freedata="modem-message",
arq="session",
status="connected",
heartbeat="received",
mycallsign=str(self.mycallsign, 'UTF-8'),
dxcallsign=str(self.dxcallsign, 'UTF-8'),
)
self.states.is_arq_session = True
self.states.set("arq_session_state", "connected")
self.states.set("is_modem_busy", True)
# 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 self.states.arq_session_state != 'disconnecting'
and self.states.arq_session_state != 'disconnected'
and self.states.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
self.dxcallsign_crc = helpers.get_crc_24(self.dxcallsign)
# override session connection attempts
self.data_channel_max_retries = attempts
self.states.set("is_modem_busy", True)
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 self.states.is_arq_session:
threading.Event().wait(2.5)
# init arq state event
self.arq_state_event = threading.Event()
# finally start the channel opening procedure
self.arq_open_data_channel(mycallsign)
# if data channel is open, return true else false
if self.states.is_arq_state_event.is_set():
# start arq transmission
self.arq_transmit(data_out, hmac_salt)
return True
else:
self.log.debug(
"[Modem] arq_open_data_channel:", transmission_uuid=self.transmission_uuid
)
self.send_data_to_socket_queue(
freedata="modem-message",
arq="transmission",
status="failed",
reason="unknown",
uuid=self.transmission_uuid,
percent=self.states.arq_transmission_percent,
bytesperminute=self.states.arq_bytes_per_minute,
compression=self.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=self.states.arq_speed_list
)
self.log.warning(
"[Modem] ARQ | TX | DATA ["
+ str(mycallsign, "UTF-8")
+ "]>>X<<["
+ str(self.dxcallsign, "UTF-8")
+ "]"
)
# Attempt to clean up the far-side, if it received the
# open_session frame and can still hear us.
self.close_session()
# otherwise return false
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
"""
# set IRS indicator to false, because we are IRS
self.is_IRS = False
# init a new random session id if we are not in an arq session
if not self.states.is_arq_session:
self.session_id = np.random.bytes(1)
# Update data_channel timestamp
self.data_channel_last_received = int(time.time())
# check if the Modem is running in low bandwidth mode
# then set the corresponding frametype and build frame
if self.low_bandwidth_mode:
frametype = bytes([FR_TYPE.ARQ_DC_OPEN_N.value])
self.log.debug("[Modem] Requesting low bandwidth mode")
else:
frametype = bytes([FR_TYPE.ARQ_DC_OPEN_W.value])
self.log.debug("[Modem] Requesting high bandwidth mode")
connection_frame = bytearray(self.length_sig0_frame)
connection_frame[:1] = frametype
connection_frame[1:4] = self.dxcallsign_crc
connection_frame[4:7] = self.mycallsign_crc
connection_frame[7:13] = helpers.callsign_to_bytes(mycallsign)
connection_frame[13:14] = self.session_id
for attempt in range(self.data_channel_max_retries):
self.send_data_to_socket_queue(
freedata="modem-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(
"[Modem] 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 self.states.channel_busy and not self.arq_state_event.is_set() or self.states.is_codec2_traffic:
self.channel_busy_handler()
# if channel free, enqueue frame for tx
if not self.states.is_arq_state_event.is_set():
self.enqueue_frame_for_tx([connection_frame], c2_mode=FREEDV_MODE.sig0.value, copies=1, repeat_delay=0)
# wait until timeout or event set
random_wait_time = randrange(int(self.duration_sig1_frame * 10), int(self.datachannel_opening_interval * 10), 1) / 10
self.arq_state_event.wait(timeout=random_wait_time)
if self.states.is_arq_state_event.is_set():
return True
if not self.states.is_modem_busy:
return False
# `data_channel_max_retries` attempts have been sent. Aborting attempt & cleaning up
return False
def arq_received_data_channel_opener(self, data_in: bytes, snr):
"""
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 self.respond_to_call and not self.states.is_arq_session:
return False
# stop processing if not in arq session, but modem state is busy and we have a different session id
# use-case we get a connection request while connecting to another station
if not self.states.is_arq_session and self.states.is_modem_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], self.ssid_list)
# 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 self.states.is_arq_state_event.is_set() and not self.is_IRS:
return False
self.is_IRS = True
self.dxcallsign_crc = bytes(data_in[4:7])
self.dxcallsign = helpers.bytes_to_callsign(bytes(data_in[7:13]))
self.states.set("dxcallsign", self.dxcallsign)
self.send_data_to_socket_queue(
freedata="modem-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)
)
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 self.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 self.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
# calculate initial speed level in correlation to latest known SNR
for i in range(len(self.mode_list)):
if snr >= self.snr_list[i]:
self.speed_level = i
# check if speed level fits to busy condition
if not self.check_if_mode_fits_to_busy_slot():
self.speed_level = 0
# Update modes we are listening to
self.set_listening_modes(True, True, self.mode_list[self.speed_level])
self.dxgrid = b'------'
helpers.add_to_heard_stations(
self.dxcallsign,
self.dxgrid,
"DATA",
snr,
self.modem_frequency_offset,
self.states.radio_frequency,
self.states.heard_stations
)
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.ssid_list)
self.log.info(
"[Modem] ARQ | DATA | RX | ["
+ str(self.mycallsign, "UTF-8")
+ "]>> <<["
+ str(self.dxcallsign, "UTF-8")
+ "]",
channel_constellation=constellation,
)
# Reset data_channel/burst timestamps
# TIMING TEST
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
self.states.set("is_arq_state", True)
self.states.set("is_modem_busy", True)
self.reset_statistics()
# Select the frame type based on the current Modem mode
if self.low_bandwidth_mode or self.received_LOW_BANDWIDTH_MODE:
frametype = bytes([FR_TYPE.ARQ_DC_OPEN_ACK_N.value])
self.log.debug("[Modem] Responding with low bandwidth mode")
else:
frametype = bytes([FR_TYPE.ARQ_DC_OPEN_ACK_W.value])
self.log.debug("[Modem] 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([self.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="modem-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(
"[Modem] ARQ | DATA | RX | ["
+ str(self.mycallsign, "UTF-8")
+ "]>>|<<["
+ str(self.dxcallsign, "UTF-8")
+ "]",
bandwidth="wide",
snr=snr,
)
# set start of transmission for our statistics
self.rx_start_of_transmission = time.time()
# TIMING TEST
# Reset data_channel/burst timestamps once again for avoiding running into timeout
# and therefore sending a NACK
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, snr) -> 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 == self.arq_protocol_version:
self.send_data_to_socket_queue(
freedata="modem-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("[Modem] 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("[Modem] high bandwidth mode", modes=self.mode_list)
# set speed level from session opener frame delegation
self.speed_level = int.from_bytes(bytes(data_in[8:9]), "big")
self.log.debug("[Modem] speed level selected for given SNR", speed_level=self.speed_level)
self.dxgrid = b'------'
helpers.add_to_heard_stations(
self.dxcallsign,
self.dxgrid,
"DATA",
snr,
self.modem_frequency_offset,
self.states.radio_frequency,
self.states.heard_stations
)
self.log.info(
"[Modem] ARQ | DATA | TX | ["
+ str(self.mycallsign, "UTF-8")
+ "]>>|<<["
+ str(self.dxcallsign, "UTF-8")
+ "]",
snr=snr,
)
# as soon as we set ARQ_STATE to True, transmission starts
self.states.set("is_arq_state", True)
# also set the ARQ event
self.arq_state_event.set()
# Update data_channel timestamp
self.data_channel_last_received = int(time.time())
else:
self.send_data_to_socket_queue(
freedata="modem-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)
)
self.log.warning(
"[Modem] protocol version mismatch:",
received=protocol_version,
own=self.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:
"""
# check if specific callsign is set with different SSID than the Modem is initialized
try:
mycallsign = helpers.callsign_to_bytes(mycallsign)
mycallsign = helpers.bytes_to_callsign(mycallsign)
except Exception:
mycallsign = self.mycallsign
if not str(dxcallsign).strip():
self.log.warning("[Modem] Missing required callsign", dxcallsign=dxcallsign)
return
# additional step for being sure our callsign is correctly
# in case we are not getting a station ssid
# then we are forcing a station ssid = 0
dxcallsign = helpers.callsign_to_bytes(dxcallsign)
dxcallsign = helpers.bytes_to_callsign(dxcallsign)
self.dxcallsign = dxcallsign
self.dxcallsign_crc = helpers.get_crc_24(self.dxcallsign)
self.send_data_to_socket_queue(
freedata="modem-message",
ping="transmitting",
dxcallsign=str(dxcallsign, "UTF-8"),
mycallsign=str(mycallsign, "UTF-8"),
)
self.log.info(
"[Modem] 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] = self.dxcallsign_crc
ping_frame[4:7] = helpers.get_crc_24(mycallsign)
ping_frame[7:13] = helpers.callsign_to_bytes(mycallsign)
if self.enable_fsk:
self.log.info("[Modem] ENABLE FSK", state=self.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, snr) -> 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], self.ssid_list)
if not valid:
# PING packet not for me.
self.log.debug("[Modem] received_ping: ping not for this station.")
return
self.dxcallsign_crc = dxcallsign_crc
self.dxcallsign = dxcallsign
self.log.info(
"[Modem] PING REQ ["
+ str(mycallsign, "UTF-8")
+ "] <<< ["
+ str(dxcallsign, "UTF-8")
+ "]",
snr=snr,
)
self.dxgrid = b'------'
helpers.add_to_heard_stations(
dxcallsign,
self.dxgrid,
"PING",
snr,
self.modem_frequency_offset,
self.states.radio_frequency,
self.states.heard_stations
)
self.send_data_to_socket_queue(
freedata="modem-message",
ping="received",
uuid=str(uuid.uuid4()),
timestamp=int(time.time()),
dxgrid=str(self.dxgrid, "UTF-8"),
dxcallsign=str(dxcallsign, "UTF-8"),
mycallsign=str(mycallsign, "UTF-8"),
snr=str(snr),
)
if self.respond_to_call:
self.transmit_ping_ack(snr)
def transmit_ping_ack(self, snr):
"""
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] = self.dxcallsign_crc
ping_frame[4:7] = self.mycallsign_crc
ping_frame[7:11] = helpers.encode_grid(self.mygrid)
ping_frame[13:14] = helpers.snr_to_bytes(snr)
if self.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, snr) -> 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], self.ssid_list)
if _valid:
self.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="modem-message",
ping="acknowledge",
uuid=str(uuid.uuid4()),
timestamp=int(time.time()),
dxgrid=str(self.dxgrid, "UTF-8"),
dxcallsign=str(self.dxcallsign, "UTF-8"),
mycallsign=str(mycallsign, "UTF-8"),
snr=str(snr),
dxsnr=str(dxsnr)
)
# combined_snr = own rx snr / snr on dx side
combined_snr = f"{snr}/{dxsnr}"
helpers.add_to_heard_stations(
self.dxcallsign,
self.dxgrid,
"PING-ACK",
combined_snr,
self.modem_frequency_offset,
self.states.radio_frequency,
self.states.heard_stations
)
self.log.info(
"[Modem] PING ACK ["
+ str(mycallsign, "UTF-8")
+ "] >|< ["
+ str(self.dxcallsign, "UTF-8")
+ "]",
snr=snr,
dxsnr=dxsnr,
)
self.states.set("is_modem_busy", False)
else:
self.log.info(
"[Modem] FOREIGN PING ACK ["
+ str(self.mycallsign, "UTF-8")
+ "] ??? ["
+ str(bytes(data_in[4:7]), "UTF-8")
+ "]",
snr=snr,
)
def stop_transmission(self) -> None:
"""
Force a stop of the running transmission
"""
self.log.warning("[Modem] Stopping transmission!")
self.send_data_to_socket_queue(
freedata="modem-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] = self.dxcallsign_crc
stop_frame[4:7] = self.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("[Modem] Stopping transmission!")
self.states.set("is_modem_busy", False)
self.states.set("is_arq_state", False)
self.send_data_to_socket_queue(
freedata="modem-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 self.states.is_beacon_running:
if (
not self.states.is_arq_session
and not self.arq_file_transfer
and not self.beacon_paused
#and not self.states.channel_busy
and not self.states.is_modem_busy
and not self.states.is_arq_state
):
self.send_data_to_socket_queue(
freedata="modem-message",
beacon="transmitting",
dxcallsign="None",
interval=self.beacon_interval,
)
self.log.info(
"[Modem] 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(self.mygrid)
if self.enable_fsk:
self.log.info("[Modem] ENABLE FSK", state=self.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)
if self.enable_morse_identifier:
modem.MODEM_TRANSMIT_QUEUE.put(["morse", 1, 0, self.mycallsign])
self.beacon_interval_timer = time.time() + self.beacon_interval
while (
time.time() < self.beacon_interval_timer
and self.states.is_beacon_running
and not self.beacon_paused
):
threading.Event().wait(0.01)
except Exception as err:
self.log.debug("[Modem] run_beacon: ", exception=err)
def received_beacon(self, data_in: bytes, snr) -> 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]))
self.dxgrid = bytes(helpers.decode_grid(data_in[7:11]), "UTF-8")
self.send_data_to_socket_queue(
freedata="modem-message",
beacon="received",
uuid=str(uuid.uuid4()),
timestamp=int(time.time()),
dxcallsign=str(beacon_callsign, "UTF-8"),
dxgrid=str(self.dxgrid, "UTF-8"),
snr=str(snr),
)
self.log.info(
"[Modem] BEACON RCVD ["
+ str(beacon_callsign, "UTF-8")
+ "]["
+ str(self.dxgrid, "UTF-8")
+ "] ",
snr=snr,
)
helpers.add_to_heard_stations(
beacon_callsign,
self.dxgrid,
"BEACON",
snr,
self.modem_frequency_offset,
self.states.radio_frequency,
self.states.heard_stations
)
def transmit_cq(self) -> None:
"""
Transmit a CQ
Args:
self
Returns:
Nothing
"""
self.log.info("[Modem] CQ CQ CQ")
self.send_data_to_socket_queue(
freedata="modem-message",
cq="transmitting",
mycallsign=self.mycallsign,
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(self.mygrid)
self.log.debug("[Modem] CQ Frame:", data=[cq_frame])
if self.enable_fsk:
self.log.info("[Modem] ENABLE FSK", state=self.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)
def received_cq(self, data_in: bytes, snr) -> 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("[Modem] received_cq:", dxcallsign=dxcallsign)
self.dxgrid = bytes(helpers.decode_grid(data_in[7:11]), "UTF-8")
self.send_data_to_socket_queue(
freedata="modem-message",
cq="received",
mycallsign=str(self.mycallsign, "UTF-8"),
dxcallsign=str(dxcallsign, "UTF-8"),
dxgrid=str(self.dxgrid, "UTF-8"),
)
self.log.info(
"[Modem] CQ RCVD ["
+ str(dxcallsign, "UTF-8")
+ "]["
+ str(self.dxgrid, "UTF-8")
+ "] ",
snr=snr,
)
helpers.add_to_heard_stations(
dxcallsign,
self.dxgrid,
"CQ CQ CQ",
snr,
self.modem_frequency_offset,
self.states.radio_frequency,
self.states.heard_stations
)
if self.respond_to_cq and self.respond_to_call:
self.transmit_qrv(dxcallsign, snr)
def transmit_qrv(self, dxcallsign: bytes, snr) -> 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("[Modem] 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="modem-message",
qrv="transmitting",
dxcallsign=str(dxcallsign, "UTF-8"),
)
self.log.info("[Modem] 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(self.mygrid)
qrv_frame[11:12] = helpers.snr_to_bytes(snr)
if self.enable_fsk:
self.log.info("[Modem] ENABLE FSK", state=self.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, snr) -> 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]))
self.dxgrid = bytes(helpers.decode_grid(data_in[7:11]), "UTF-8")
dxsnr = helpers.snr_from_bytes(data_in[11:12])
combined_snr = f"{snr}/{dxsnr}"
self.send_data_to_socket_queue(
freedata="modem-message",
qrv="received",
dxcallsign=str(dxcallsign, "UTF-8"),
dxgrid=str(self.dxgrid, "UTF-8"),
snr=str(snr),
dxsnr=str(dxsnr)
)
self.log.info(
"[Modem] QRV RCVD ["
+ str(dxcallsign, "UTF-8")
+ "]["
+ str(self.dxgrid, "UTF-8")
+ "] ",
snr=snr,
dxsnr=dxsnr
)
helpers.add_to_heard_stations(
dxcallsign,
self.dxgrid,
"QRV",
combined_snr,
self.modem_frequency_offset,
self.states.radio_frequency,
self.states.heard_stations
)
def received_is_writing(self, data_in: bytes, snr) -> 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="modem-message",
fec="is_writing",
dxcallsign=str(dxcallsign, "UTF-8")
)
self.log.info(
"[Modem] IS_WRITING RCVD ["
+ str(dxcallsign, "UTF-8")
+ "] ",
)
def channel_busy_handler(self):
"""
function for handling the channel busy situation
Args:
Returns:
"""
self.log.warning("[Modem] Channel busy, waiting until free...")
self.send_data_to_socket_queue(
freedata="modem-message",
channel="busy",
status="waiting",
)
# wait while timeout not reached and our busy state is busy
channel_busy_timeout = time.time() + self.channel_busy_timeout
while self.states.channel_busy and time.time() < channel_busy_timeout and not self.check_if_mode_fits_to_busy_slot():
threading.Event().wait(0.01)
# ------------ CALCULATE TRANSFER RATES
def calculate_transfer_rate_rx(
self, rx_start_of_transmission: float, receivedbytes: int, snr
) -> 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 self.states.arq_total_bytes == 0:
self.states.set("arq_total_bytes", 1)
arq_transmission_percent = min(
int(
(
receivedbytes
* self.arq_compression_factor
/ self.states.arq_total_bytes
)
* 100
),
100,
)
transmissiontime = time.time() - self.rx_start_of_transmission
if receivedbytes > 0:
arq_bits_per_second = int((receivedbytes * 8) / transmissiontime)
bytes_per_minute = int(
receivedbytes / (transmissiontime / 60)
)
arq_seconds_until_finish = int(((self.states.arq_total_bytes - receivedbytes) / (
bytes_per_minute * self.arq_compression_factor)) * 60) - 20 # offset because of frame ack/nack
speed_chart = {"snr": snr, "bpm": bytes_per_minute, "timestamp": int(time.time())}
# check if data already in list
if speed_chart not in self.states.arq_speed_list:
self.states.arq_speed_list.append(speed_chart)
else:
arq_bits_per_second = 0
bytes_per_minute = 0
arq_seconds_until_finish = 0
except Exception as err:
self.log.error(f"[Modem] calculate_transfer_rate_rx: Exception: {err}")
arq_transmission_percent = 0.0
arq_bits_per_second = 0
bytes_per_minute = 0
self.states.set("arq_bits_per_second", arq_bits_per_second)
self.states.set("bytes_per_minute", bytes_per_minute)
self.states.set("arq_transmission_percent", arq_transmission_percent)
self.states.set("arq_compression_factor", self.arq_compression_factor)
return [
arq_bits_per_second,
bytes_per_minute,
arq_transmission_percent,
]
def reset_statistics(self) -> None:
"""
Reset statistics
"""
# reset ARQ statistics
self.states.set("bytes_per_minute_burst", 0)
self.states.set("arq_total_bytes", 0)
self.states.set("self.states.arq_seconds_until_finish", 0)
self.states.set("arq_bits_per_second", 0)
self.states.set("bytes_per_minute", 0)
self.states.set("arq_transmission_percent", 0)
self.states.set("arq_compression_factor", 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_transmission_percent = min(
int((sentbytes / tx_buffer_length) * 100), 100
)
transmissiontime = time.time() - tx_start_of_transmission
if sentbytes > 0:
arq_bits_per_second = int((sentbytes * 8) / transmissiontime)
bytes_per_minute = int(sentbytes / (transmissiontime / 60))
arq_seconds_until_finish = int(((tx_buffer_length - sentbytes) / (
bytes_per_minute * self.arq_compression_factor)) * 60)
speed_chart = {"snr": self.burst_ack_snr, "bpm": bytes_per_minute,
"timestamp": int(time.time())}
# check if data already in list
if speed_chart not in self.states.arq_speed_list:
self.states.arq_speed_list.append(speed_chart)
else:
arq_bits_per_second = 0
bytes_per_minute = 0
arq_seconds_until_finish = 0
except Exception as err:
self.log.error(f"[Modem] calculate_transfer_rate_tx: Exception: {err}")
arq_transmission_percent = 0.0
arq_bits_per_second = 0
bytes_per_minute = 0
self.states.set("arq_bits_per_second", arq_bits_per_second)
self.states.set("bytes_per_minute", bytes_per_minute)
self.states.set("arq_transmission_percent", arq_transmission_percent)
self.states.set("arq_compression_factor", self.arq_compression_factor)
# ----------------------CLEANUP AND RESET FUNCTIONS
def arq_cleanup(self) -> None:
"""
Cleanup function which clears all ARQ states
"""
if TESTMODE:
self.log.debug("[Modem] TESTMODE: arq_cleanup: Not performing cleanup.")
return
self.log.debug("[Modem] 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
self.arq_rx_burst_buffer = []
self.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
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
self.states.set("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 self.states.is_arq_session:
self.states.set("is_modem_busy", False)
self.dxcallsign = b"AA0AA-0"
self.mycallsign = self.mycallsign
self.session_id = bytes(1)
self.states.set("arq_session_state", "disconnected")
self.states.arq_speed_list = []
self.states.set("is_arq_state", False)
self.arq_state_event = threading.Event()
self.arq_file_transfer = False
self.beacon_paused = 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("[Modem] 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("[Modem] 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("[Modem] 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("[Modem] 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(
"[Modem] 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 self.states.is_arq_state
and self.states.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 = self.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 is reached, if we didnt receive data, while we waited
# for the corresponding data frame + the transmitted signalling frame of ack/nack
# + a small offset of about 1 second
timeout = \
(
self.burst_last_received
+ (self.time_list[self.speed_level] * frames_left)
+ self.duration_sig0_frame
+ self.channel_busy_timeout
+ 1
)
# override calculation
# if we reached 2/3 of the waiting time and didnt received a signal
# then send NACK earlier
time_left = timeout - time.time()
waiting_time = (self.time_list[self.speed_level] * frames_left) + self.duration_sig0_frame + self.channel_busy_timeout + 1
timeout_percent = 100 - (time_left / waiting_time * 100)
#timeout_percent = 0
if timeout_percent >= 75 and not self.states.is_codec2_traffic and not self.states.is_transmitting:
override = True
else:
override = False
# TODO Enable this for development
print(f"timeout expected in:{round(timeout - time.time())} | timeout percent: {timeout_percent} | frames left: {frames_left} of {self.rx_n_frames_per_burst} | speed level: {self.speed_level}")
# if timeout is expired, but we are receivingt codec2 data,
# better wait some more time because data might be important for us
# reason for this situation can be delays on IRS and ISS, maybe because both had a busy channel condition.
# Nevertheless, we need to keep timeouts short for efficiency
if timeout <= time.time() or modem_error_state and not self.states.is_codec2_traffic and not self.states.is_transmitting or override:
self.log.warning(
"[Modem] 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: {self.arq_rx_burst_buffer.count(None)}")
# check if we have N frames per burst > 1
if self.rx_n_frames_per_burst > 1 and self.burst_rpt_counter < 3 and self.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 counter
self.burst_last_received = time.time()
# 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)
self.states.set("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(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:
# debugging output
# 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 self.states.is_arq_state and self.states.is_modem_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())
self.states.set("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(
"[Modem] DATA ["
+ str(self.mycallsign, "UTF-8")
+ "]<<T>>["
+ str(self.dxcallsign, "UTF-8")
+ "]"
)
self.send_data_to_socket_queue(
freedata="modem-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 (
self.states.is_arq_session
and self.states.is_modem_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(
"[Modem] SESSION ["
+ str(self.mycallsign, "UTF-8")
+ "]<<T>>["
+ str(self.dxcallsign, "UTF-8")
+ "]"
)
self.send_data_to_socket_queue(
freedata="modem-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 (
self.states.is_arq_session
and self.IS_ARQ_SESSION_MASTER
and self.states.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"""
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
# check callsign
if mycallsign in [None]:
mycallsign = self.mycallsign
mycallsign = helpers.callsign_to_bytes(mycallsign)
mycallsign = helpers.bytes_to_callsign(mycallsign)
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 self.states.channel_busy and not self.states.is_transmitting:
self.enqueue_frame_for_tx(
frame_to_tx=[fec_frame], c2_mode=codec2.FREEDV_MODE["sig0"].value
)
else:
return False
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