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FreeDATA/tnc/data_handler.py
DJ2LS 443d7931b7 small ctest adjustments
2022-12-24 23:13:21 +01:00

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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
import base64
import sys
import threading
import time
import uuid
import lzma
from random import randrange# , randbytes
import codec2
import helpers
import modem
import numpy as np
import sock
import static
import structlog
import ujson as json
from codec2 import FREEDV_MODE
from exceptions import NoCallsign
from queues import DATA_QUEUE_RECEIVED, DATA_QUEUE_TRANSMIT, RX_BUFFER
from static import FRAME_TYPE as FR_TYPE
TESTMODE = False
class DATA:
"""Terminal Node Controller for FreeDATA"""
log = structlog.get_logger("DATA")
def __init__(self) -> None:
# Initial call sign. Will be overwritten later
self.mycallsign = static.MYCALLSIGN
self.dxcallsign = static.DXCALLSIGN
self.data_queue_transmit = DATA_QUEUE_TRANSMIT
self.data_queue_received = DATA_QUEUE_RECEIVED
# length of signalling frame
self.length_sig0_frame = 14
self.length_sig1_frame = 14
# 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
# actual n retries of burst
self.tx_n_retry_of_burst = 0
self.transmission_uuid = ""
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 acknowledge frame for a burst
self.burst_ack = False
# Flag to indicate if we received an acknowledge frame for a data frame
self.data_frame_ack_received = False
# Flag to indicate if we received an request for repeater frames
self.rpt_request_received = False
self.rpt_request_buffer = [] # requested frames, saved in a list
self.rx_start_of_transmission = 0 # time of transmission start
# 3 bytes for the BOF Beginning of File indicator in a data frame
self.data_frame_bof = b"BOF"
# 3 bytes for the EOF End of File indicator in a data frame
self.data_frame_eof = b"EOF"
self.tx_n_max_retries_per_burst = 40
self.rx_n_max_retries_per_burst = 40
self.n_retries_per_burst = 0
# Flag to indicate if we recevied a low bandwidth mode channel opener
self.received_LOW_BANDWIDTH_MODE = False
self.data_channel_max_retries = 15
self.datachannel_timeout = False
# -------------- AVAILABLE MODES START-----------
# IMPORTANT: LISTS MUST BE OF EQUAL LENGTH
# --------------------- LOW BANDWIDTH
# List of codec2 modes to use in "low bandwidth" mode.
self.mode_list_low_bw = [
FREEDV_MODE.datac3.value,
]
# List for minimum SNR operating level for the corresponding mode in self.mode_list
self.snr_list_low_bw = [0]
# List for time to wait for corresponding mode in seconds
self.time_list_low_bw = [6]
# --------------------- HIGH BANDWIDTH
# List of codec2 modes to use in "high bandwidth" mode.
self.mode_list_high_bw = [
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 = [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
self.time_list_high_bw = [7, 8]
# -------------- 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 static.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
static.ARQ_SPEED_LEVEL = self.speed_level
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 = 3.0 # timeout for burst acknowledges
self.data_frame_ack_timeout_seconds = 3.0 # timeout for data frame acknowledges
self.rpt_ack_timeout_seconds = 3.0 # timeout for rpt frame acknowledges
self.transmission_timeout = 180 # transmission timeout in seconds
# Dictionary of functions and log messages used in process_data
# instead of a long series of if-elif-else statements.
self.rx_dispatcher = {
FR_TYPE.ARQ_DC_OPEN_ACK_N.value: (
self.arq_received_channel_is_open,
"ARQ OPEN ACK (Narrow)",
),
FR_TYPE.ARQ_DC_OPEN_ACK_W.value: (
self.arq_received_channel_is_open,
"ARQ OPEN ACK (Wide)",
),
FR_TYPE.ARQ_DC_OPEN_N.value: (
self.arq_received_data_channel_opener,
"ARQ Data Channel Open (Narrow)",
),
FR_TYPE.ARQ_DC_OPEN_W.value: (
self.arq_received_data_channel_opener,
"ARQ Data Channel Open (Wide)",
),
FR_TYPE.ARQ_SESSION_CLOSE.value: (
self.received_session_close,
"ARQ CLOSE SESSION",
),
FR_TYPE.ARQ_SESSION_HB.value: (
self.received_session_heartbeat,
"ARQ HEARTBEAT",
),
FR_TYPE.ARQ_SESSION_OPEN.value: (
self.received_session_opener,
"ARQ OPEN SESSION",
),
FR_TYPE.ARQ_STOP.value: (self.received_stop_transmission, "ARQ STOP TX"),
FR_TYPE.BEACON.value: (self.received_beacon, "BEACON"),
FR_TYPE.BURST_ACK.value: (self.burst_ack_nack_received, "BURST ACK"),
FR_TYPE.BURST_NACK.value: (self.burst_ack_nack_received, "BURST NACK"),
FR_TYPE.CQ.value: (self.received_cq, "CQ"),
FR_TYPE.FR_ACK.value: (self.frame_ack_received, "FRAME ACK"),
FR_TYPE.FR_NACK.value: (self.frame_nack_received, "FRAME NACK"),
FR_TYPE.FR_REPEAT.value: (self.burst_rpt_received, "REPEAT REQUEST"),
FR_TYPE.PING_ACK.value: (self.received_ping_ack, "PING ACK"),
FR_TYPE.PING.value: (self.received_ping, "PING"),
FR_TYPE.QRV.value: (self.received_qrv, "QRV"),
}
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_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()
# Dispatch commands known to command_dispatcher
if data[0] in self.command_dispatcher:
self.log.debug(f"[TNC] TX {self.command_dispatcher[data[0]][1]}...")
self.command_dispatcher[data[0]][0]()
# Dispatch commands that need more arguments.
elif data[0] == "CONNECT":
# [1] mycallsign
# [2] dxcallsign
# [3] attempts
self.arq_session_handler(data[1], data[2], data[3])
elif data[0] == "PING":
# [1] mycallsign
# [2] dxcallsign
self.transmit_ping(data[1], data[2])
elif data[0] == "BEACON":
# [1] INTERVAL int
# [2] STATE bool
if data[2]:
self.beacon_interval = data[1]
static.BEACON_STATE = True
else:
static.BEACON_STATE = False
elif data[0] == "ARQ_RAW":
# [1] DATA_OUT bytes
# [2] MODE int
# [3] N_FRAMES_PER_BURST int
# [4] self.transmission_uuid str
# [5] mycallsign with ssid
# [6] dxcallsign with ssid
# [7] attempts
self.open_dc_and_transmit(data[1], data[2], data[3], data[4], data[5], data[6], data[7])
else:
self.log.error(
"[TNC] worker_transmit: received invalid command:", data=data
)
def worker_receive(self) -> None:
"""Queue received data for processing"""
while True:
data = self.data_queue_received.get()
# [0] bytes
# [1] freedv instance
# [2] bytes_per_frame
self.process_data(
bytes_out=data[0], freedv=data[1], bytes_per_frame=data[2]
)
def process_data(self, bytes_out, freedv, bytes_per_frame: int) -> None:
"""
Process incoming data and decide what to do with the frame.
Args:
bytes_out:
freedv:
bytes_per_frame:
Returns:
"""
self.log.debug(
"[TNC] process_data:", n_retries_per_burst=self.n_retries_per_burst
)
# Process data only if broadcast or we are the receiver
# bytes_out[1:4] == callsign check for signalling frames,
# bytes_out[2:5] == transmission
# we could also create an own function, which returns True.
frametype = int.from_bytes(bytes(bytes_out[:1]), "big")
# check for callsign CRC
_valid1, _ = helpers.check_callsign(self.mycallsign, bytes(bytes_out[1:4]))
_valid2, _ = helpers.check_callsign(self.mycallsign, bytes(bytes_out[2:5]))
# check for session ID
# signalling frames
_valid3 = helpers.check_session_id(self.session_id, bytes(bytes_out[1:2]))
# arq data frames
_valid4 = helpers.check_session_id(self.session_id, bytes(bytes_out[2:3]))
if (
_valid1
or _valid2
or _valid3
or _valid4
or frametype
in [
FR_TYPE.CQ.value,
FR_TYPE.QRV.value,
FR_TYPE.PING.value,
FR_TYPE.BEACON.value,
]
):
# CHECK IF FRAMETYPE IS BETWEEN 10 and 50 ------------------------
# frame = frametype - 10
# n_frames_per_burst = int.from_bytes(bytes(bytes_out[1:2]), "big")
# Dispatch activity based on received frametype
if frametype in self.rx_dispatcher:
# Process frames "known" by rx_dispatcher
# self.log.debug(f"[TNC] {self.rx_dispatcher[frametype][1]} RECEIVED....")
self.rx_dispatcher[frametype][0](bytes_out[:-2])
# Process frametypes requiring a different set of arguments.
elif FR_TYPE.BURST_51.value >= frametype >= FR_TYPE.BURST_01.value:
# get snr of received data
# FIXME: find a fix for this - after moving to classes, this no longer works
# snr = self.calculate_snr(freedv)
snr = static.SNR
self.log.debug("[TNC] RX SNR", snr=snr)
# send payload data to arq checker without CRC16
self.arq_data_received(
bytes(bytes_out[:-2]), bytes_per_frame, snr, freedv
)
# if we received the last frame of a burst or the last remaining rpt frame, do a modem unsync
# if static.RX_BURST_BUFFER.count(None) <= 1 or (frame+1) == n_frames_per_burst:
# self.log.debug(f"[TNC] LAST FRAME OF BURST --> UNSYNC {frame+1}/{n_frames_per_burst}")
# self.c_lib.freedv_set_sync(freedv, 0)
# TESTFRAMES
elif frametype == FR_TYPE.TEST_FRAME.value:
self.log.debug("[TNC] TESTFRAME RECEIVED", frame=bytes_out[:])
# Unknown frame type
else:
self.log.warning(
"[TNC] ARQ - other frame type", frametype=FR_TYPE(frametype).name
)
else:
# for debugging purposes to receive all data
self.log.debug(
"[TNC] Foreign frame received",
frame=bytes_out[:-2].hex(),
frame_type=FR_TYPE(int.from_bytes(bytes_out[:1], byteorder="big")).name,
)
def enqueue_frame_for_tx(
self,
frame_to_tx,# : list[bytearray], # this causes a crash on python 3.7
c2_mode=FREEDV_MODE.datac0.value,
copies=1,
repeat_delay=0,
) -> None:
"""
Send (transmit) supplied frame to TNC
:param frame_to_tx: Frame data to send
:type frame_to_tx: list of bytearrays
:param c2_mode: Codec2 mode to use, defaults to 14 (datac0)
: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
"""
self.log.debug("[TNC] enqueue_frame_for_tx", c2_mode=FREEDV_MODE(c2_mode).name)
# Set the TRANSMITTING flag before adding an object to the transmit queue
# TODO: This is not that nice, we could improve this somehow
static.TRANSMITTING = True
modem.MODEM_TRANSMIT_QUEUE.put([c2_mode, copies, repeat_delay, frame_to_tx])
# Wait while transmitting
while static.TRANSMITTING:
threading.Event().wait(0.01)
def send_data_to_socket_queue(self, **jsondata):
"""
Send information to the UI via JSON and the sock.SOCKET_QUEUE.
Args:
Dictionary containing the data to be sent, in the format:
key=value, for each item. E.g.:
self.send_data_to_socket_queue(
freedata="tnc-message",
arq="received",
status="success",
uuid=self.transmission_uuid,
timestamp=timestamp,
mycallsign=str(self.mycallsign, "UTF-8"),
dxcallsign=str(static.DXCALLSIGN, "UTF-8"),
dxgrid=str(static.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(static.DXCALLSIGN, "UTF-8")
except Exception as e:
self.log.debug("[TNC] error adding callsigns to network message", e=e)
# run json dumps
json_data_out = json.dumps(jsondata)
self.log.debug("[TNC] send_data_to_socket_queue:", jsondata=json_data_out)
# finally push data to our network queue
sock.SOCKET_QUEUE.put(json_data_out)
def send_ident_frame(self, transmit) -> None:
"""Build and send IDENT frame """
ident_frame = bytearray(self.length_sig1_frame)
ident_frame[:1] = bytes([FR_TYPE.IDENT.value])
ident_frame[1:self.length_sig1_frame] = self.mycallsign
# Transmit frame
if transmit:
self.enqueue_frame_for_tx([ident_frame], c2_mode=FREEDV_MODE.datac0.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[1:4] = static.DXCALLSIGN_CRC
# ack_frame[4:7] = static.MYCALLSIGN_CRC
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)])
# 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)
# ack_frame[1:4] = static.DXCALLSIGN_CRC
# ack_frame[4:7] = static.MYCALLSIGN_CRC
# ack_frame[7:8] = bytes([int(snr)])
# ack_frame[8:9] = bytes([int(self.speed_level)])
# Transmit frame
# TODO: Do we have to send , self.send_ident_frame(False) ?
# self.enqueue_frame_for_tx([ack_frame, self.send_ident_frame(False)], c2_mode=FREEDV_MODE.sig1.value, copies=3, repeat_delay=0)
self.enqueue_frame_for_tx([ack_frame], c2_mode=FREEDV_MODE.sig1.value, copies=6, repeat_delay=0)
def send_retransmit_request_frame(self, freedv) -> 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(static.RX_BURST_BUFFER)
if element is None
]
# set n frames per burst to modem
# this is an idea, so it's not getting lost....
# we need to work on this
codec2.api.freedv_set_frames_per_burst(freedv, len(missing_frames))
# TODO: Trim `missing_frames` bytesarray to [7:13] (6) frames, if it's larger.
# TODO: Instead of using int we could use a binary flag
# then create a repeat frame
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[1:4] = static.DXCALLSIGN_CRC
# rpt_frame[4:7] = static.MYCALLSIGN_CRC
# rpt_frame[7:13] = missing_frames
self.log.info("[TNC] ARQ | RX | Requesting", frames=missing_frames)
# Transmit frame
self.enqueue_frame_for_tx([rpt_frame], c2_mode=FREEDV_MODE.sig1.value, copies=1, repeat_delay=0)
def send_burst_nack_frame(self, snr: bytes) -> None:
"""Build and send NACK frame for received DATA frame"""
nack_frame = bytearray(self.length_sig1_frame)
nack_frame[:1] = bytes([FR_TYPE.FR_NACK.value])
nack_frame[1:2] = self.session_id
# nack_frame[1:4] = static.DXCALLSIGN_CRC
# nack_frame[4:7] = static.MYCALLSIGN_CRC
nack_frame[2:3] = helpers.snr_to_bytes(snr)
nack_frame[3:4] = bytes([int(self.speed_level)])
# 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)
self.enqueue_frame_for_tx([nack_frame], c2_mode=FREEDV_MODE.sig1.value, copies=6, repeat_delay=0)
def send_burst_nack_frame_watchdog(self, snr: bytes) -> None:
"""Build and send NACK frame for watchdog timeout"""
# increment nack counter for transmission stats
self.frame_nack_counter += 1
# Create and send ACK frame
self.log.info("[TNC] ARQ | RX | SENDING NACK")
nack_frame = bytearray(self.length_sig1_frame)
nack_frame[:1] = bytes([FR_TYPE.BURST_NACK.value])
nack_frame[1:2] = self.session_id
# nack_frame[1:4] = static.DXCALLSIGN_CRC
# nack_frame[4:7] = static.MYCALLSIGN_CRC
nack_frame[2:3] = helpers.snr_to_bytes(snr)
nack_frame[3:4] = bytes([int(self.speed_level)])
# TRANSMIT NACK FRAME FOR BURST
self.enqueue_frame_for_tx([nack_frame], c2_mode=FREEDV_MODE.sig1.value, copies=1, repeat_delay=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] = static.DXCALLSIGN_CRC
# TODO: Needed? disconnection_frame[7:13] = helpers.callsign_to_bytes(self.mycallsign)
# self.enqueue_frame_for_tx([disconnection_frame, self.send_ident_frame(False)], c2_mode=FREEDV_MODE.sig0.value, copies=5, repeat_delay=0)
# TODO: We need to add the ident frame feature with a seperate PR after publishing latest protocol
# TODO: We need to wait some time between last arq related signalling frame and ident frame
# TODO: Maybe about 500ms - 1500ms to avoid confusion and too much PTT toggles
self.enqueue_frame_for_tx([disconnection_frame], c2_mode=FREEDV_MODE.sig0.value, copies=6, 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)
# TODO: this seems not to work anymore
# get received crc for different mycall ssids
# check if callsign ssid override
# _, mycallsign = helpers.check_callsign(
# self.mycallsign, data_in[2:5]
# )
# attempt fixing this
mycallsign = self.mycallsign
# only process data if we are in ARQ and BUSY state else return to quit
if not static.ARQ_STATE and static.TNC_STATE not in ["BUSY"]:
self.log.warning("[TNC] wrong tnc state - dropping data", arq_state=static.ARQ_STATE, tnc_state=static.TNC_STATE)
return
self.arq_file_transfer = True
static.TNC_STATE = "BUSY"
static.ARQ_STATE = True
# Update data_channel timestamp
self.data_channel_last_received = int(time.time())
# Extract some important data from the frame
# Get sequence number of burst frame
rx_n_frame_of_burst = int.from_bytes(bytes(data_in[:1]), "big") - 10
# Get number of bursts from received frame
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(static.RX_BURST_BUFFER) != rx_n_frames_per_burst:
static.RX_BURST_BUFFER = [None] * rx_n_frames_per_burst
# Append data to rx burst buffer
# [frame_type][n_frames_per_burst][CRC24][CRC24]
# static.RX_BURST_BUFFER[rx_n_frame_of_burst] = data_in[8:] # type: ignore
static.RX_BURST_BUFFER[rx_n_frame_of_burst] = data_in[3:] # type: ignore
self.log.debug("[TNC] static.RX_BURST_BUFFER", buffer=static.RX_BURST_BUFFER)
helpers.add_to_heard_stations(
static.DXCALLSIGN,
static.DXGRID,
"DATA-CHANNEL",
snr,
static.FREQ_OFFSET,
static.HAMLIB_FREQUENCY,
)
# Check if we received all frames in the burst by checking if burst buffer has no more "Nones"
# This is the ideal case because we received all data
if None not in static.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 static.RX_BURST_BUFFER:
# static.RX_FRAME_BUFFER += static.RX_BURST_BUFFER[i]
temp_burst_buffer += bytes(value) # type: ignore
# 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 static.RX_FRAME_BUFFER.endswith(temp_burst_buffer):
self.log.info(
"[TNC] ARQ | RX | Frame already received - sending ACK again"
)
static.RX_BURST_BUFFER = []
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
# static.RX_FRAME_BUFFER --> existing data
# temp_burst_buffer --> new data
# search_area --> area where we want to search
search_area = 510 - 3 # (3 bytes arq frame header)
search_position = len(static.RX_FRAME_BUFFER) - search_area
# 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
get_position = static.RX_FRAME_BUFFER[search_position:].rfind(
temp_burst_buffer
)
# if we find data, replace it at this position with the new data and strip it
if get_position >= 0:
static.RX_FRAME_BUFFER = static.RX_FRAME_BUFFER[
: search_position + get_position
]
static.RX_FRAME_BUFFER += temp_burst_buffer
self.log.warning(
"[TNC] ARQ | RX | replacing existing buffer data",
area=search_area,
pos=get_position,
)
# If we don't find data in this range, we really have new data and going to replace it
else:
static.RX_FRAME_BUFFER += temp_burst_buffer
self.log.debug("[TNC] ARQ | RX | appending data to 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.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 static.SNR >= self.snr_list[new_speed_level]:
self.speed_level = new_speed_level
else:
self.log.info("[TNC] ARQ | increasing speed level not possible because of SNR limit",
given_snr=static.SNR,
needed_snr=self.snr_list[new_speed_level]
)
static.ARQ_SPEED_LEVEL = self.speed_level
# Update modes we are listening to
self.set_listening_modes(False, True, self.mode_list[self.speed_level])
# Create and send ACK frame
self.log.info("[TNC] ARQ | RX | SENDING ACK")
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(static.RX_FRAME_BUFFER)
)
# send a network message with information
self.send_data_to_socket_queue(
freedata="tnc-message",
arq="transmission",
status="receiving",
uuid=self.transmission_uuid,
percent=static.ARQ_TRANSMISSION_PERCENT,
bytesperminute=static.ARQ_BYTES_PER_MINUTE,
mycallsign=str(self.mycallsign, 'UTF-8'),
dxcallsign=str(self.dxcallsign, 'UTF-8'),
)
elif rx_n_frame_of_burst == rx_n_frames_per_burst - 1:
# We have "Nones" in our rx buffer,
# Check if we received last frame of burst - this is an indicator for missed frames.
# With this way of doing this, we always MUST receive the last
# frame of a burst otherwise the entire burst is lost
# TODO: See if a timeout on the send side with re-transmit last burst would help.
self.log.debug(
"[TNC] all frames in burst received:",
frame=rx_n_frame_of_burst,
frames=rx_n_frames_per_burst,
)
self.send_retransmit_request_frame(freedv)
self.calculate_transfer_rate_rx(
self.rx_start_of_transmission, len(static.RX_FRAME_BUFFER)
)
# Should never reach this point
else:
self.log.error(
"[TNC] data_handler: Should not reach this point...",
frame=rx_n_frame_of_burst,
frames=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 = static.RX_FRAME_BUFFER.find(self.data_frame_bof)
eof_position = static.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:
payload = static.RX_FRAME_BUFFER[
bof_position + len(self.data_frame_bof): eof_position
]
frame_length = int.from_bytes(payload[4:8], "big") # 4:8 4bytes
static.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)
static.ARQ_COMPRESSION_FACTOR = compression_factor / 10
self.calculate_transfer_rate_rx(
self.rx_start_of_transmission, len(static.RX_FRAME_BUFFER)
)
if (
bof_position >= 0
and eof_position > 0
and None not in static.RX_BURST_BUFFER
):
self.log.debug(
"[TNC] arq_data_received:",
bof_position=bof_position,
eof_position=eof_position,
)
self.rx_frame_bof_received = True
self.rx_frame_eof_received = True
# Extract raw data from buffer
payload = static.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
static.TOTAL_BYTES = frame_length
# 8:9 = compression factor
data_frame = payload[9:]
data_frame_crc_received = helpers.get_crc_32(data_frame)
# Check if data_frame_crc is equal with received crc
if data_frame_crc == data_frame_crc_received:
# transmittion duration
duration = time.time() - self.rx_start_of_transmission
self.log.info("[TNC] ARQ | RX | DATA FRAME SUCCESSFULLY RECEIVED", nacks=self.frame_nack_counter,bytesperminute=static.ARQ_BYTES_PER_MINUTE, duration=duration
)
# Decompress the data frame
data_frame_decompressed = lzma.decompress(data_frame)
static.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(static.RX_BUFFER_SIZE)
else:
# if full, free space by getting an item
self.log.info(
"[TNC] ARQ | RX | RX_BUFFER FULL - dropping old data",
buffer_size=RX_BUFFER.qsize(),
maxsize=int(static.RX_BUFFER_SIZE)
)
RX_BUFFER.get()
# add item to RX_BUFFER
self.log.info(
"[TNC] ARQ | RX | saving data to rx buffer",
buffer_size=RX_BUFFER.qsize() + 1,
maxsize=RX_BUFFER.maxsize
)
try:
RX_BUFFER.put(
[
self.transmission_uuid,
timestamp,
static.DXCALLSIGN,
static.DXGRID,
base64_data,
]
)
except Exception as e:
# File "/usr/lib/python3.7/queue.py", line 133, in put
# if self.maxsize > 0
# TypeError: '>' not supported between instances of 'str' and 'int'
#
# Occurs on Raspberry Pi and Python 3.7
self.log.error(
"[TNC] ARQ | RX | error occurred when saving data!",
e=e,
uuid = self.transmission_uuid,
timestamp = timestamp,
dxcall = static.DXCALLSIGN,
dxgrid = static.DXGRID,
data = base64_data
)
self.send_data_to_socket_queue(
freedata="tnc-message",
arq="transmission",
status="received",
uuid=self.transmission_uuid,
timestamp=timestamp,
mycallsign=str(mycallsign, "UTF-8"),
dxcallsign=str(static.DXCALLSIGN, "UTF-8"),
dxgrid=str(static.DXGRID, "UTF-8"),
data=base64_data,
)
self.log.info(
"[TNC] ARQ | RX | SENDING DATA FRAME ACK",
snr=snr,
crc=data_frame_crc.hex(),
)
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(static.RX_FRAME_BUFFER)
)
self.log.info(
"[TNC] | RX | DATACHANNEL ["
+ str(self.mycallsign, "UTF-8")
+ "]<< >>["
+ str(static.DXCALLSIGN, "UTF-8")
+ "]",
snr=snr,
)
else:
self.send_data_to_socket_queue(
freedata="tnc-message",
arq="transmission",
status="failed",
uuid=self.transmission_uuid,
mycallsign=str(self.mycallsign, 'UTF-8'),
dxcallsign=str(self.dxcallsign, 'UTF-8'),
)
duration = time.time() - self.rx_start_of_transmission
self.log.warning(
"[TNC] ARQ | RX | DATA FRAME NOT SUCCESSFULLY RECEIVED!",
e="wrong crc",
expected=data_frame_crc.hex(),
received=data_frame_crc_received.hex(),
overflows=static.BUFFER_OVERFLOW_COUNTER,
nacks=self.frame_nack_counter,
duration=duration,
bytesperminute=static.ARQ_BYTES_PER_MINUTE
)
self.log.info("[TNC] ARQ | RX | Sending NACK")
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_transmit(self, data_out: bytes, mode: int, n_frames_per_burst: int):
"""
Transmit ARQ frame
Args:
data_out:bytes:
mode:int:
n_frames_per_burst:int:
"""
self.arq_file_transfer = True
# 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 --> kBytes
# static.TOTAL_BYTES = round(len(data_out) / 1024, 2)
static.TOTAL_BYTES = len(data_out)
frame_total_size = len(data_out).to_bytes(4, byteorder="big")
self.send_data_to_socket_queue(
freedata="tnc-message",
arq="transmission",
status="transmitting",
uuid=self.transmission_uuid,
percent=static.ARQ_TRANSMISSION_PERCENT,
bytesperminute=static.ARQ_BYTES_PER_MINUTE,
mycallsign=str(self.mycallsign, 'UTF-8'),
dxcallsign=str(self.dxcallsign, 'UTF-8'),
)
self.log.info(
"[TNC] | TX | DATACHANNEL",
Bytes=static.TOTAL_BYTES,
)
# Compress data frame
data_frame_compressed = lzma.compress(data_out)
compression_factor = len(data_out) / len(data_frame_compressed)
static.ARQ_COMPRESSION_FACTOR = np.clip(compression_factor, 0, 255)
compression_factor = bytes([int(static.ARQ_COMPRESSION_FACTOR * 10)])
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))
# Append a crc at the beginning and end of file indicators
frame_payload_crc = helpers.get_crc_32(data_out)
self.log.debug("[TNC] frame payload CRC:", crc=frame_payload_crc.hex())
# Assemble the data frame
data_out = (
self.data_frame_bof
+ frame_payload_crc
+ frame_total_size
+ compression_factor
+ data_out
+ self.data_frame_eof
)
# Initial bufferposition is 0
bufferposition = bufferposition_end = 0
# Iterate through data_out buffer
while not self.data_frame_ack_received and static.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):
# data_mode = mode
# self.log.debug("[TNC] FIXED MODE:", mode=FREEDV_MODE(data_mode).name)
# we are doing a modulo check of transmission retries of the actual burst
# every 2nd retry which fails, decreases speedlevel by 1.
# as soon as we received an ACK for the current burst, speed_level will increase
# by 1.
# The intent is to optimize speed by adapting to the current RF conditions.
# if not self.tx_n_retry_of_burst % 2 and self.tx_n_retry_of_burst > 0:
# self.speed_level = max(self.speed_level - 1, 0)
# if self.tx_n_retry_of_burst <= 1:
# self.speed_level += 1
# self.speed_level = max(self.speed_level + 1, len(self.mode_list) - 1)
# 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)
static.ARQ_SPEED_LEVEL = self.speed_level
data_mode = self.mode_list[self.speed_level]
self.log.debug(
"[TNC] Speed-level:",
level=self.speed_level,
retry=self.tx_n_retry_of_burst,
mode=FREEDV_MODE(data_mode).name,
)
# Payload information
payload_per_frame = modem.get_bytes_per_frame(data_mode) - 2
# Tempbuffer list for storing our data frames
tempbuffer = []
# Append data frames with n_frames_per_burst to tempbuffer
# TODO: this part needs a complete rewrite!
# n_frames_per_burst = 1 is working
arqheader = bytearray()
# arqheader[:1] = bytes([FR_TYPE.BURST_01.value + i])
arqheader[:1] = bytes([FR_TYPE.BURST_01.value])
arqheader[1:2] = bytes([n_frames_per_burst])
arqheader[2:3] = self.session_id
# arqheader[2:5] = static.DXCALLSIGN_CRC
# arqheader[5:8] = static.MYCALLSIGN_CRC
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
# Append frame to tempbuffer for transmission
tempbuffer.append(frame)
self.log.debug("[TNC] tempbuffer:", tempbuffer=tempbuffer)
self.log.info(
"[TNC] ARQ | TX | FRAMES",
mode=FREEDV_MODE(data_mode).name,
fpb=n_frames_per_burst,
retry=self.tx_n_retry_of_burst,
)
for t_buf_item in tempbuffer:
self.enqueue_frame_for_tx([t_buf_item], c2_mode=data_mode)
# After transmission finished, wait for an ACK or RPT frame
# burstacktimeout = time.time() + self.burst_ack_timeout_seconds + 100
# while (not self.burst_ack and not self.burst_nack and
# not self.rpt_request_received and not self.data_frame_ack_received and
# time.time() < burstacktimeout and static.ARQ_STATE):
# threading.Event().wait(0.01)
# burstacktimeout = time.time() + self.burst_ack_timeout_seconds + 100
while static.ARQ_STATE and not (
self.burst_ack
or self.burst_nack
or self.rpt_request_received
or self.data_frame_ack_received
):
threading.Event().wait(0.01)
# Once we receive a burst ack, reset its state and break the RETRIES loop
if self.burst_ack:
self.burst_ack = False # reset ack state
self.tx_n_retry_of_burst = 0 # reset retries
self.log.debug(
"[TNC] arq_transmit: Received BURST ACK. Sending next chunk."
, irs_snr=self.burst_ack_snr)
break # break retry loop
if self.burst_nack:
self.burst_nack = False # reset nack state
# not yet implemented
if self.rpt_request_received:
pass
if self.data_frame_ack_received:
self.log.debug(
"[TNC] arq_transmit: Received FRAME ACK. Sending next chunk."
)
break # break retry loop
# We need this part for leaving the repeat loop
# static.ARQ_STATE == "DATA" --> when stopping transmission manually
if not static.ARQ_STATE:
# print("not ready for data...leaving loop....")
self.log.debug(
"[TNC] arq_transmit: ARQ State changed to FALSE. Breaking retry loop."
)
break
self.calculate_transfer_rate_tx(
tx_start_of_transmission, bufferposition_end, len(data_out)
)
# NEXT ATTEMPT
self.log.debug(
"[TNC] ATTEMPT:",
retry=self.tx_n_retry_of_burst,
maxretries=self.tx_n_max_retries_per_burst,
overflows=static.BUFFER_OVERFLOW_COUNTER,
)
# End of FOR loop
# update buffer position
bufferposition = bufferposition_end
# update stats
self.calculate_transfer_rate_tx(
tx_start_of_transmission, bufferposition_end, len(data_out)
)
self.send_data_to_socket_queue(
freedata="tnc-message",
arq="transmission",
status="transmitting",
uuid=self.transmission_uuid,
percent=static.ARQ_TRANSMISSION_PERCENT,
bytesperminute=static.ARQ_BYTES_PER_MINUTE,
irs_snr=self.burst_ack_snr,
mycallsign=str(self.mycallsign, 'UTF-8'),
dxcallsign=str(self.dxcallsign, 'UTF-8'),
)
# Stay in the while loop until we receive a data_frame_ack. Otherwise,
# the loop exits after sending the last frame only once and doesn't
# wait for an acknowledgement.
if self.data_frame_ack_received and bufferposition > len(data_out):
self.log.debug("[TNC] arq_tx: Last fragment sent and acknowledged.")
break
# GOING TO NEXT ITERATION
if self.data_frame_ack_received:
# we need to wait until sending "transmitted" state
# gui database is too slow for handling this within 0.001 seconds
# so let's sleep a little
threading.Event().wait(0.2)
self.send_data_to_socket_queue(
freedata="tnc-message",
arq="transmission",
status="transmitted",
uuid=self.transmission_uuid,
percent=static.ARQ_TRANSMISSION_PERCENT,
bytesperminute=static.ARQ_BYTES_PER_MINUTE,
mycallsign=str(self.mycallsign, 'UTF-8'),
dxcallsign=str(self.dxcallsign, 'UTF-8'),
)
self.log.info(
"[TNC] ARQ | TX | DATA TRANSMITTED!",
BytesPerMinute=static.ARQ_BYTES_PER_MINUTE,
BitsPerSecond=static.ARQ_BITS_PER_SECOND,
overflows=static.BUFFER_OVERFLOW_COUNTER,
)
else:
self.send_data_to_socket_queue(
freedata="tnc-message",
arq="transmission",
status="failed",
uuid=self.transmission_uuid,
percent=static.ARQ_TRANSMISSION_PERCENT,
bytesperminute=static.ARQ_BYTES_PER_MINUTE,
mycallsign=str(self.mycallsign, 'UTF-8'),
dxcallsign=str(self.dxcallsign, 'UTF-8'),
)
self.log.info(
"[TNC] ARQ | TX | TRANSMISSION FAILED OR TIME OUT!",
overflows=static.BUFFER_OVERFLOW_COUNTER,
)
self.stop_transmission()
# Last but not least do a state cleanup
self.arq_cleanup()
if TESTMODE:
# Quit after transmission
self.log.debug("[TNC] TESTMODE: arq_transmit exiting.")
sys.exit(0)
def burst_ack_nack_received(self, data_in: bytes) -> None:
"""
Received an ACK/NACK for a transmitted frame, keep track and
make adjustments to speed level if needed.
Args:
data_in:bytes:
Returns:
"""
# Process data only if we are in ARQ and BUSY state
if static.ARQ_STATE:
helpers.add_to_heard_stations(
static.DXCALLSIGN,
static.DXGRID,
"DATA-CHANNEL",
static.SNR,
static.FREQ_OFFSET,
static.HAMLIB_FREQUENCY,
)
frametype = int.from_bytes(bytes(data_in[:1]), "big")
desc = "ack"
if frametype == FR_TYPE.BURST_ACK.value:
# Increase speed level if we received a burst ack
# self.speed_level = min(self.speed_level + 1, len(self.mode_list) - 1)
# Force data retry loops of TX TNC to stop and continue with next frame
self.burst_ack = True
# Reset burst nack counter
self.burst_nack_counter = 0
# Reset n retries per burst counter
self.n_retries_per_burst = 0
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
desc = "nack"
# 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")
static.ARQ_SPEED_LEVEL = self.speed_level
#self.log.debug(
# f"[TNC] burst_{desc}_received:",
# speed_level=self.speed_level,
# c2_mode=FREEDV_MODE(self.mode_list[self.speed_level]).name,
#)
def frame_ack_received(
self, data_in: bytes # pylint: disable=unused-argument
) -> None:
"""Received an ACK for a transmitted frame"""
# Process data only if we are in ARQ and BUSY state
if static.ARQ_STATE:
helpers.add_to_heard_stations(
static.DXCALLSIGN,
static.DXGRID,
"DATA-CHANNEL",
static.SNR,
static.FREQ_OFFSET,
static.HAMLIB_FREQUENCY,
)
# Force data loops of TNC to stop and continue with next frame
self.data_frame_ack_received = True
# Update arq_session and data_channel timestamp
self.data_channel_last_received = int(time.time())
self.arq_session_last_received = int(time.time())
def frame_nack_received(
self, data_in: bytes # pylint: disable=unused-argument
) -> None:
"""
Received a NACK for a transmitted frame
Args:
data_in:bytes:
"""
self.log.warning("[TNC] ARQ FRAME NACK RECEIVED - cleanup!",
arq="transmission",
status="failed",
uuid=self.transmission_uuid,
percent=static.ARQ_TRANSMISSION_PERCENT,
bytesperminute=static.ARQ_BYTES_PER_MINUTE,
mycallsign=str(self.mycallsign, 'UTF-8'),
dxcallsign=str(self.dxcallsign, 'UTF-8'),
)
helpers.add_to_heard_stations(
static.DXCALLSIGN,
static.DXGRID,
"DATA-CHANNEL",
static.SNR,
static.FREQ_OFFSET,
static.HAMLIB_FREQUENCY,
)
self.send_data_to_socket_queue(
freedata="tnc-message",
arq="transmission",
status="failed",
uuid=self.transmission_uuid,
percent=static.ARQ_TRANSMISSION_PERCENT,
bytesperminute=static.ARQ_BYTES_PER_MINUTE,
mycallsign=str(self.mycallsign, 'UTF-8'),
dxcallsign=str(self.dxcallsign, 'UTF-8'),
)
# Update data_channel timestamp
self.arq_session_last_received = int(time.time())
self.arq_cleanup()
def burst_rpt_received(self, data_in: bytes):
"""
Repeat request frame received for transmitted frame
Args:
data_in:bytes:
"""
# Only process data if we are in ARQ and BUSY state
if static.ARQ_STATE and static.TNC_STATE == "BUSY":
helpers.add_to_heard_stations(
static.DXCALLSIGN,
static.DXGRID,
"DATA-CHANNEL",
static.SNR,
static.FREQ_OFFSET,
static.HAMLIB_FREQUENCY,
)
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[3:12]) # 1:9
for i in range(0, 6, 2):
if not missing_area[i: i + 2].endswith(b"\x00\x00"):
missing = missing_area[i: i + 2]
self.rpt_request_buffer.insert(0, missing)
############################################################################################################
# ARQ SESSION HANDLER
############################################################################################################
def arq_session_handler(self, mycallsign, dxcallsign, attempts) -> bool:
"""
Create a session with `static.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
static.DXCALLSIGN = self.dxcallsign
static.DXCALLSIGN_CRC = helpers.get_crc_24(self.dxcallsign)
# TODO: we need to check this, maybe placing it to class init
self.datachannel_timeout = False
self.log.info(
"[TNC] SESSION ["
+ str(self.mycallsign, "UTF-8")
+ "]>> <<["
+ str(self.dxcallsign, "UTF-8")
+ "]",
state=static.ARQ_SESSION_STATE,
)
# Let's check if we have a busy channel
if static.CHANNEL_BUSY:
self.log.warning("[TNC] Channel busy, waiting until free...")
self.send_data_to_socket_queue(
freedata="tnc-message",
arq="session",
status="waiting",
mycallsign=str(self.mycallsign, 'UTF-8'),
dxcallsign=str(self.dxcallsign, 'UTF-8'),
)
# wait while timeout not reached and our busy state is busy
channel_busy_timeout = time.time() + 30
while static.CHANNEL_BUSY and time.time() < channel_busy_timeout:
threading.Event().wait(0.01)
# if channel busy timeout reached stop connecting
if time.time() > channel_busy_timeout:
self.log.warning("[TNC] Channel busy, try again later...")
static.ARQ_SESSION_STATE = "failed"
self.send_data_to_socket_queue(
freedata="tnc-message",
arq="session",
status="failed",
reason="busy",
mycallsign=str(self.mycallsign, 'UTF-8'),
dxcallsign=str(self.dxcallsign, 'UTF-8'),
)
return False
self.open_session()
# wait until data channel is open
while not static.ARQ_SESSION and not self.arq_session_timeout:
threading.Event().wait(0.01)
static.ARQ_SESSION_STATE = "connecting"
self.send_data_to_socket_queue(
freedata="tnc-message",
arq="session",
status="connecting",
mycallsign=str(self.mycallsign, 'UTF-8'),
dxcallsign=str(self.dxcallsign, 'UTF-8'),
)
if static.ARQ_SESSION and static.ARQ_SESSION_STATE == "connected":
# static.ARQ_SESSION_STATE = "connected"
self.send_data_to_socket_queue(
freedata="tnc-message",
arq="session",
status="connected",
mycallsign=str(self.mycallsign, 'UTF-8'),
dxcallsign=str(self.dxcallsign, 'UTF-8'),
)
return True
self.log.warning(
"[TNC] SESSION FAILED ["
+ str(self.mycallsign, "UTF-8")
+ "]>>X<<["
+ str(self.dxcallsign, "UTF-8")
+ "]",
attempts=self.session_connect_max_retries, # Adjust for 0-based for user display
reason="maximum connection attempts reached",
state=static.ARQ_SESSION_STATE,
)
static.ARQ_SESSION_STATE = "failed"
self.send_data_to_socket_queue(
freedata="tnc-message",
arq="session",
status="failed",
reason="timeout",
mycallsign=str(self.mycallsign, 'UTF-8'),
dxcallsign=str(self.dxcallsign, 'UTF-8'),
)
return False
def open_session(self) -> bool:
"""
Create and send the frame to request a connection.
Returns:
True if the session was opened successfully
False if the session open request failed
"""
self.IS_ARQ_SESSION_MASTER = True
static.ARQ_SESSION_STATE = "connecting"
# create a random session id
# self.session_id = randbytes(1)
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] = static.DXCALLSIGN_CRC
connection_frame[5:8] = static.MYCALLSIGN_CRC
connection_frame[8:14] = helpers.callsign_to_bytes(self.mycallsign)
while not static.ARQ_SESSION:
threading.Event().wait(0.01)
for attempt in range(self.session_connect_max_retries):
self.log.info(
"[TNC] SESSION ["
+ str(self.mycallsign, "UTF-8")
+ "]>>?<<["
+ str(self.dxcallsign, "UTF-8")
+ "]",
a=str(attempt + 1) + "/" + str(self.session_connect_max_retries), # Adjust for 0-based for user display
state=static.ARQ_SESSION_STATE,
)
self.send_data_to_socket_queue(
freedata="tnc-message",
arq="session",
status="connecting",
attempt=attempt + 1,
maxattempts=self.session_connect_max_retries,
mycallsign=str(self.mycallsign, 'UTF-8'),
dxcallsign=str(self.dxcallsign, 'UTF-8'),
)
self.enqueue_frame_for_tx([connection_frame], c2_mode=FREEDV_MODE.datac0.value, copies=1, repeat_delay=0)
# Wait for a time, looking to see if `static.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 static.ARQ_SESSION:
return True
# Stop waiting and interrupt if data channel is getting closed while opening
if static.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 static.ARQ_SESSION:
self.close_session()
return False
# Given the while condition, it will only exit when `static.ARQ_SESSION` is True
self.send_data_to_socket_queue(
freedata="tnc-message",
arq="session",
status="connected",
mycallsign=str(self.mycallsign, 'UTF-8'),
dxcallsign=str(self.dxcallsign, 'UTF-8'),
)
return True
def received_session_opener(self, data_in: bytes) -> None:
"""
Received a session open request packet.
Args:
data_in:bytes:
"""
# if we don't want to respond to calls, return False
if not static.RESPOND_TO_CALL:
return False
self.IS_ARQ_SESSION_MASTER = False
static.ARQ_SESSION_STATE = "connecting"
# Update arq_session timestamp
self.arq_session_last_received = int(time.time())
self.session_id = bytes(data_in[1:2])
static.DXCALLSIGN_CRC = bytes(data_in[5:8])
self.dxcallsign = helpers.bytes_to_callsign(bytes(data_in[8:14]))
static.DXCALLSIGN = self.dxcallsign
# check if callsign ssid override
valid, mycallsign = helpers.check_callsign(self.mycallsign, data_in[2:5])
self.mycallsign = mycallsign
helpers.add_to_heard_stations(
static.DXCALLSIGN,
static.DXGRID,
"DATA-CHANNEL",
static.SNR,
static.FREQ_OFFSET,
static.HAMLIB_FREQUENCY,
)
self.log.info(
"[TNC] SESSION ["
+ str(self.mycallsign, "UTF-8")
+ "]>>|<<["
+ str(self.dxcallsign, "UTF-8")
+ "]",
state=static.ARQ_SESSION_STATE,
)
static.ARQ_SESSION = True
static.TNC_STATE = "BUSY"
self.send_data_to_socket_queue(
freedata="tnc-message",
arq="session",
status="connected",
mycallsign=str(self.mycallsign, 'UTF-8'),
dxcallsign=str(self.dxcallsign, 'UTF-8'),
)
self.transmit_session_heartbeat()
def close_session(self) -> None:
"""Close the ARQ session"""
static.ARQ_SESSION_STATE = "disconnecting"
self.log.info(
"[TNC] SESSION ["
+ str(self.mycallsign, "UTF-8")
+ "]<<X>>["
+ str(self.dxcallsign, "UTF-8")
+ "]",
state=static.ARQ_SESSION_STATE,
)
self.send_data_to_socket_queue(
freedata="tnc-message",
arq="session",
status="close",
mycallsign=str(self.mycallsign, 'UTF-8'),
dxcallsign=str(self.dxcallsign, 'UTF-8'),
)
self.IS_ARQ_SESSION_MASTER = False
static.ARQ_SESSION = False
# we need to send disconnect frame before doing arq cleanup
# we would lose our session id then
self.send_disconnect_frame()
self.arq_cleanup()
static.ARQ_SESSION_STATE = "disconnected"
def received_session_close(self, data_in: bytes):
"""
Closes the session when a close session frame is received and
the DXCALLSIGN_CRC matches the remote station participating in the session.
Args:
data_in:bytes:
"""
print(static.ARQ_SESSION_STATE)
# We've arrived here from process_data which already checked that the frame
# is intended for this station.
# Close the session if the CRC matches the remote station in static.
_valid_crc, mycallsign = helpers.check_callsign(self.mycallsign, bytes(data_in[2:5]))
_valid_session = helpers.check_session_id(self.session_id, bytes(data_in[1:2]))
if (_valid_crc or _valid_session) and static.ARQ_SESSION_STATE not in ["disconnected"]:
static.ARQ_SESSION_STATE = "disconnected"
helpers.add_to_heard_stations(
static.DXCALLSIGN,
static.DXGRID,
"DATA-CHANNEL",
static.SNR,
static.FREQ_OFFSET,
static.HAMLIB_FREQUENCY,
)
self.log.info(
"[TNC] SESSION ["
+ str(mycallsign, "UTF-8")
+ "]<<X>>["
+ str(self.dxcallsign, "UTF-8")
+ "]",
state=static.ARQ_SESSION_STATE,
)
self.send_data_to_socket_queue(
freedata="tnc-message",
arq="session",
status="close",
mycallsign=str(mycallsign, 'UTF-8'),
dxcallsign=str(self.dxcallsign, 'UTF-8'),
)
self.IS_ARQ_SESSION_MASTER = False
static.ARQ_SESSION = False
self.arq_cleanup()
def transmit_session_heartbeat(self) -> None:
"""Send ARQ sesion heartbeat while connected"""
# static.ARQ_SESSION = True
# static.TNC_STATE = "BUSY"
# static.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
# connection_frame[1:4] = static.DXCALLSIGN_CRC
# connection_frame[4:7] = static.MYCALLSIGN_CRC
self.send_data_to_socket_queue(
freedata="tnc-message",
arq="session",
status="connected",
heartbeat="transmitting",
mycallsign=str(self.mycallsign, 'UTF-8'),
dxcallsign=str(self.dxcallsign, 'UTF-8'),
)
self.enqueue_frame_for_tx([connection_frame], c2_mode=FREEDV_MODE.datac0.value, copies=1, repeat_delay=0)
def received_session_heartbeat(self, data_in: bytes) -> None:
"""
Received an ARQ session heartbeat, record and update state accordingly.
Args:
data_in:bytes:
"""
# Accept session data if the DXCALLSIGN_CRC matches the station in static or session id.
_valid_crc, _ = helpers.check_callsign(self.dxcallsign, bytes(data_in[4:7]))
_valid_session = helpers.check_session_id(self.session_id, bytes(data_in[1:2]))
if _valid_crc or _valid_session and static.ARQ_SESSION_STATE in ["connected", "connecting"]:
self.log.debug("[TNC] Received session heartbeat")
helpers.add_to_heard_stations(
self.dxcallsign,
static.DXGRID,
"SESSION-HB",
static.SNR,
static.FREQ_OFFSET,
static.HAMLIB_FREQUENCY,
)
self.send_data_to_socket_queue(
freedata="tnc-message",
arq="session",
status="connected",
heartbeat="received",
mycallsign=str(self.mycallsign, 'UTF-8'),
dxcallsign=str(self.dxcallsign, 'UTF-8'),
)
static.ARQ_SESSION = True
static.ARQ_SESSION_STATE = "connected"
static.TNC_STATE = "BUSY"
# Update the timeout timestamps
self.arq_session_last_received = int(time.time())
self.data_channel_last_received = int(time.time())
# transmit session heartbeat only
# -> if not session master
# --> this will be triggered by heartbeat watchdog
# -> if not during a file transfer
# -> if ARQ_SESSION_STATE != disconnecting, disconnected, failed
# --> to avoid heartbeat toggle loops while disconnecting
if (
not self.IS_ARQ_SESSION_MASTER
and not self.arq_file_transfer
and static.ARQ_SESSION_STATE != 'disconnecting'
and static.ARQ_SESSION_STATE != 'disconnected'
and static.ARQ_SESSION_STATE != 'failed'
):
self.transmit_session_heartbeat()
##########################################################################################################
# ARQ DATA CHANNEL HANDLER
##########################################################################################################
def open_dc_and_transmit(
self,
data_out: bytes,
mode: int,
n_frames_per_burst: int,
transmission_uuid: str,
mycallsign,
dxcallsign,
attempts: int,
) -> bool:
"""
Open data channel and transmit data
Args:
data_out:bytes:
mode:int:
n_frames_per_burst:int:
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
# override session connection attempts
self.data_channel_max_retries = attempts
static.TNC_STATE = "BUSY"
self.arq_file_transfer = True
self.transmission_uuid = transmission_uuid
# wait a moment for the case, a heartbeat is already on the way back to us
# this makes channel establishment more clean
if static.ARQ_SESSION:
threading.Event().wait(2)
self.datachannel_timeout = False
# we need to compress data for getting a compression factor.
# so we are compressing twice. This is not that nice and maybe there is another way
# for calculating transmission statistics
# static.ARQ_COMPRESSION_FACTOR = len(data_out) / len(lzma.compress(data_out))
# Let's check if we have a busy channel and if we are not in a running arq session.
if static.CHANNEL_BUSY and not static.ARQ_SESSION:
self.log.warning("[TNC] Channel busy, waiting until free...")
self.send_data_to_socket_queue(
freedata="tnc-message",
arq="transmission",
status="waiting",
mycallsign=str(self.mycallsign, 'UTF-8'),
dxcallsign=str(self.dxcallsign, 'UTF-8'),
)
# wait while timeout not reached and our busy state is busy
channel_busy_timeout = time.time() + 30
while static.CHANNEL_BUSY and time.time() < channel_busy_timeout:
threading.Event().wait(0.01)
# if channel busy timeout reached, stop connecting
if time.time() > channel_busy_timeout:
self.log.warning("[TNC] Channel busy, try again later...")
static.ARQ_SESSION_STATE = "failed"
self.send_data_to_socket_queue(
freedata="tnc-message",
arq="transmission",
status="failed",
reason="busy",
mycallsign=str(self.mycallsign, 'UTF-8'),
dxcallsign=str(self.dxcallsign, 'UTF-8'),
)
static.ARQ_SESSION_STATE = "disconnected"
return False
self.arq_open_data_channel(mode, n_frames_per_burst, mycallsign)
# wait until data channel is open
while not static.ARQ_STATE and not self.datachannel_timeout:
threading.Event().wait(0.01)
if static.ARQ_STATE:
self.arq_transmit(data_out, mode, n_frames_per_burst)
return True
return False
def arq_open_data_channel(
self, mode: int, n_frames_per_burst: int, mycallsign
) -> bool:
"""
Open an ARQ data channel.
Args:
mode:int:
n_frames_per_burst:int:
mycallsign:bytes:
Returns:
True if the data channel was opened successfully
False if the data channel failed to open
"""
self.is_IRS = False
# init a new random session id if we are not in an arq session
if not static.ARQ_SESSION:
# self.session_id = randbytes(1)
self.session_id = np.random.bytes(1)
# Update data_channel timestamp
self.data_channel_last_received = int(time.time())
if static.LOW_BANDWIDTH_MODE:
frametype = bytes([FR_TYPE.ARQ_DC_OPEN_N.value])
self.log.debug("[TNC] Requesting low bandwidth mode")
else:
frametype = bytes([FR_TYPE.ARQ_DC_OPEN_W.value])
self.log.debug("[TNC] Requesting high bandwidth mode")
connection_frame = bytearray(self.length_sig0_frame)
connection_frame[:1] = frametype
connection_frame[1:4] = static.DXCALLSIGN_CRC
connection_frame[4:7] = static.MYCALLSIGN_CRC
connection_frame[7:13] = helpers.callsign_to_bytes(mycallsign)
# connection_frame[13:14] = bytes([n_frames_per_burst])
connection_frame[13:14] = self.session_id
while not static.ARQ_STATE:
threading.Event().wait(0.01)
for attempt in range(self.data_channel_max_retries):
self.send_data_to_socket_queue(
freedata="tnc-message",
arq="transmission",
status="opening",
mycallsign=str(mycallsign, 'UTF-8'),
dxcallsign=str(self.dxcallsign,'UTF-8'),
)
self.log.info(
"[TNC] ARQ | DATA | TX | ["
+ str(mycallsign, "UTF-8")
+ "]>> <<["
+ str(self.dxcallsign, "UTF-8")
+ "]",
attempt=f"{str(attempt + 1)}/{str(self.data_channel_max_retries)}",
)
self.enqueue_frame_for_tx([connection_frame], c2_mode=FREEDV_MODE.datac0.value, copies=1, repeat_delay=0)
timeout = time.time() + 3
while time.time() < timeout:
threading.Event().wait(0.01)
# Stop waiting if data channel is opened
if static.ARQ_STATE:
return True
# `data_channel_max_retries` attempts have been sent. Aborting attempt & cleaning up
self.log.debug(
"[TNC] arq_open_data_channel:", transmission_uuid=self.transmission_uuid
)
self.send_data_to_socket_queue(
freedata="tnc-message",
arq="transmission",
status="failed",
reason="unknown",
uuid=self.transmission_uuid,
percent=static.ARQ_TRANSMISSION_PERCENT,
bytesperminute=static.ARQ_BYTES_PER_MINUTE,
mycallsign=str(self.mycallsign, 'UTF-8'),
dxcallsign=str(self.dxcallsign, 'UTF-8'),
)
self.log.warning(
"[TNC] ARQ | TX | DATA ["
+ str(mycallsign, "UTF-8")
+ "]>>X<<["
+ str(self.dxcallsign, "UTF-8")
+ "]"
)
self.datachannel_timeout = True
# Attempt to clean up the far-side, if it received the
# open_session frame and can still hear us.
self.close_session()
self.arq_cleanup()
return False
# Shouldn't get here...
return True
def arq_received_data_channel_opener(self, data_in: bytes):
"""
Received request to open data channel frame
Args:
data_in:bytes:
"""
# We've arrived here from process_data which already checked that the frame
# is intended for this station.
# stop processing if we don't want to respond to a call when not in a arq session
if not static.RESPOND_TO_CALL and not static.ARQ_SESSION:
return False
self.arq_file_transfer = True
self.is_IRS = True
# check if callsign ssid override
_, self.mycallsign = helpers.check_callsign(self.mycallsign, data_in[1:4])
static.DXCALLSIGN_CRC = bytes(data_in[4:7])
self.dxcallsign = helpers.bytes_to_callsign(bytes(data_in[7:13]))
static.DXCALLSIGN = self.dxcallsign
self.send_data_to_socket_queue(
freedata="tnc-message",
arq="transmission",
status="opening",
mycallsign=str(self.mycallsign, 'UTF-8'),
dxcallsign=str(self.dxcallsign, 'UTF-8'),
)
# n_frames_per_burst is currently unused
# n_frames_per_burst = int.from_bytes(bytes(data_in[13:14]), "big")
frametype = int.from_bytes(bytes(data_in[:1]), "big")
# check if we received low bandwidth mode
# possible channel constellations
# ISS(w) <-> IRS(w)
# ISS(w) <-> IRS(n)
# ISS(n) <-> IRS(w)
# ISS(n) <-> IRS(n)
if frametype == FR_TYPE.ARQ_DC_OPEN_W.value and not static.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 and static.LOW_BANDWIDTH_MODE:
# 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 static.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 and static.LOW_BANDWIDTH_MODE:
# 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 really bad SNR and no matching mode
self.speed_level = 0
for i in range(len(self.mode_list)):
if static.SNR >= self.snr_list[i]:
self.speed_level = i
self.log.debug(
"[TNC] calculated speed level",
speed_level=self.speed_level,
given_snr=static.SNR,
min_snr=self.snr_list[self.speed_level],
)
# Update modes we are listening to
self.set_listening_modes(True, True, self.mode_list[self.speed_level])
helpers.add_to_heard_stations(
static.DXCALLSIGN,
static.DXGRID,
"DATA-CHANNEL",
static.SNR,
static.FREQ_OFFSET,
static.HAMLIB_FREQUENCY,
)
self.session_id = data_in[13:14]
print(self.session_id)
# check again if callsign ssid override
_, self.mycallsign = helpers.check_callsign(self.mycallsign, data_in[1:4])
self.log.info(
"[TNC] ARQ | DATA | RX | ["
+ str(self.mycallsign, "UTF-8")
+ "]>> <<["
+ str(self.dxcallsign, "UTF-8")
+ "]",
channel_constellation=constellation,
)
static.ARQ_STATE = True
static.TNC_STATE = "BUSY"
self.reset_statistics()
# Update data_channel timestamp
self.data_channel_last_received = int(time.time())
# Select the frame type based on the current TNC mode
if static.LOW_BANDWIDTH_MODE or self.received_LOW_BANDWIDTH_MODE:
frametype = bytes([FR_TYPE.ARQ_DC_OPEN_ACK_N.value])
self.log.debug("[TNC] Responding with low bandwidth mode")
else:
frametype = bytes([FR_TYPE.ARQ_DC_OPEN_ACK_W.value])
self.log.debug("[TNC] Responding with high bandwidth mode")
connection_frame = bytearray(self.length_sig0_frame)
connection_frame[:1] = frametype
connection_frame[1:2] = self.session_id
# connection_frame[1:4] = static.DXCALLSIGN_CRC
# connection_frame[4:7] = static.MYCALLSIGN_CRC
connection_frame[8:9] = bytes([self.speed_level])
# For checking protocol version on the receiving side
connection_frame[13:14] = bytes([static.ARQ_PROTOCOL_VERSION])
self.enqueue_frame_for_tx([connection_frame], c2_mode=FREEDV_MODE.datac0.value, copies=1, repeat_delay=0)
self.send_data_to_socket_queue(
freedata="tnc-message",
arq="transmission",
status="opened",
mycallsign=str(self.mycallsign, 'UTF-8'),
dxcallsign=str(self.dxcallsign, 'UTF-8'),
)
self.log.info(
"[TNC] ARQ | DATA | RX | ["
+ str(self.mycallsign, "UTF-8")
+ "]>>|<<["
+ str(self.dxcallsign, "UTF-8")
+ "]",
bandwidth="wide",
snr=static.SNR,
)
# set start of transmission for our statistics
self.rx_start_of_transmission = time.time()
# Update data_channel timestamp
self.data_channel_last_received = int(time.time())
def arq_received_channel_is_open(self, data_in: bytes) -> None:
"""
Called if we received a data channel opener
Args:
data_in:bytes:
"""
protocol_version = int.from_bytes(bytes(data_in[13:14]), "big")
if protocol_version == static.ARQ_PROTOCOL_VERSION:
self.send_data_to_socket_queue(
freedata="tnc-message",
arq="transmission",
status="opened",
mycallsign=str(self.mycallsign, 'UTF-8'),
dxcallsign=str(self.dxcallsign, 'UTF-8'),
)
frametype = int.from_bytes(bytes(data_in[:1]), "big")
if frametype == FR_TYPE.ARQ_DC_OPEN_ACK_N.value:
self.received_LOW_BANDWIDTH_MODE = True
self.mode_list = self.mode_list_low_bw
self.time_list = self.time_list_low_bw
self.log.debug("[TNC] low bandwidth mode", modes=self.mode_list)
else:
self.received_LOW_BANDWIDTH_MODE = False
self.mode_list = self.mode_list_high_bw
self.time_list = self.time_list_high_bw
self.log.debug("[TNC] high bandwidth mode", modes=self.mode_list)
# set speed level from session opener frame which is selected by SNR measurement
self.speed_level = int.from_bytes(bytes(data_in[8:9]), "big")
self.log.debug("[TNC] speed level selected for given SNR", speed_level=self.speed_level)
# self.speed_level = len(self.mode_list) - 1
helpers.add_to_heard_stations(
static.DXCALLSIGN,
static.DXGRID,
"DATA-CHANNEL",
static.SNR,
static.FREQ_OFFSET,
static.HAMLIB_FREQUENCY,
)
self.log.info(
"[TNC] ARQ | DATA | TX | ["
+ str(self.mycallsign, "UTF-8")
+ "]>>|<<["
+ str(self.dxcallsign, "UTF-8")
+ "]",
snr=static.SNR,
)
# as soon as we set ARQ_STATE to DATA, transmission starts
static.ARQ_STATE = True
# Update data_channel timestamp
self.data_channel_last_received = int(time.time())
else:
static.TNC_STATE = "IDLE"
static.ARQ_STATE = False
self.send_data_to_socket_queue(
freedata="tnc-message",
arq="transmission",
status="failed",
reason="protocol version missmatch",
mycallsign=str(self.mycallsign, 'UTF-8'),
dxcallsign=str(self.dxcallsign, 'UTF-8'),
)
# TODO: We should display a message to this effect on the UI.
self.log.warning(
"[TNC] protocol version mismatch:",
received=protocol_version,
own=static.ARQ_PROTOCOL_VERSION,
)
self.arq_cleanup()
# ---------- PING
def transmit_ping(self, mycallsign: bytes, dxcallsign: bytes) -> None:
"""
Funktion for controlling pings
Args:
mycallsign:bytes:
dxcallsign:bytes:
"""
if not str(dxcallsign).strip():
# TODO: We should display a message to this effect on the UI.
self.log.warning("[TNC] Missing required callsign", dxcallsign=dxcallsign)
return
static.DXCALLSIGN = dxcallsign
static.DXCALLSIGN_CRC = helpers.get_crc_24(static.DXCALLSIGN)
self.send_data_to_socket_queue(
freedata="tnc-message",
ping="transmitting",
dxcallsign=str(dxcallsign, "UTF-8"),
mycallsign=str(mycallsign, "UTF-8"),
snr=str(static.SNR),
)
self.log.info(
"[TNC] PING REQ ["
+ str(mycallsign, "UTF-8")
+ "] >>> ["
+ str(dxcallsign, "UTF-8")
+ "]"
)
ping_frame = bytearray(self.length_sig0_frame)
ping_frame[:1] = bytes([FR_TYPE.PING.value])
ping_frame[1:4] = static.DXCALLSIGN_CRC
ping_frame[4:7] = helpers.get_crc_24(mycallsign)
ping_frame[7:13] = helpers.callsign_to_bytes(mycallsign)
self.log.info("[TNC] ENABLE FSK", state=static.ENABLE_FSK)
if static.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.datac0.value)
def received_ping(self, data_in: bytes) -> None:
"""
Called if we received a ping
Args:
data_in:bytes:
"""
dxcallsign_crc = bytes(data_in[4:7])
dxcallsign = helpers.bytes_to_callsign(bytes(data_in[7:13]))
# check if callsign ssid override
valid, mycallsign = helpers.check_callsign(self.mycallsign, data_in[1:4])
if not valid:
# PING packet not for me.
self.log.debug("[TNC] received_ping: ping not for this station.")
return
static.DXCALLSIGN_CRC = dxcallsign_crc
static.DXCALLSIGN = dxcallsign
self.log.info(
"[TNC] PING REQ ["
+ str(mycallsign, "UTF-8")
+ "] <<< ["
+ str(dxcallsign, "UTF-8")
+ "]",
snr=static.SNR,
)
helpers.add_to_heard_stations(
dxcallsign,
static.DXGRID,
"PING",
static.SNR,
static.FREQ_OFFSET,
static.HAMLIB_FREQUENCY,
)
self.send_data_to_socket_queue(
freedata="tnc-message",
ping="received",
uuid=str(uuid.uuid4()),
timestamp=int(time.time()),
dxgrid=str(static.DXGRID, "UTF-8"),
dxcallsign = str(dxcallsign, "UTF-8"),
mycallsign=str(mycallsign, "UTF-8"),
snr=str(static.SNR),
)
if static.RESPOND_TO_CALL:
ping_frame = bytearray(self.length_sig0_frame)
ping_frame[:1] = bytes([FR_TYPE.PING_ACK.value])
ping_frame[1:4] = static.DXCALLSIGN_CRC
ping_frame[4:7] = static.MYCALLSIGN_CRC
ping_frame[7:13] = static.MYGRID
ping_frame[13:14] = helpers.snr_to_bytes(static.SNR)
if static.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.datac0.value)
def received_ping_ack(self, data_in: bytes) -> None:
"""
Called if a PING ack has been received
Args:
data_in:bytes:
"""
# check if we received correct ping
# check if callsign ssid override
_valid, mycallsign = helpers.check_callsign(self.mycallsign, data_in[1:4])
if _valid:
# static.DXCALLSIGN_CRC = bytes(data_in[4:7])
static.DXGRID = bytes(data_in[7:13]).rstrip(b"\x00")
dxsnr = helpers.snr_from_bytes(data_in[13:14])
self.send_data_to_socket_queue(
freedata="tnc-message",
ping="acknowledge",
uuid=str(uuid.uuid4()),
timestamp=int(time.time()),
dxgrid=str(static.DXGRID, "UTF-8"),
dxcallsign = str(self.dxcallsign, "UTF-8"),
mycallsign=str(mycallsign, "UTF-8"),
snr=str(static.SNR),
dxsnr=str(dxsnr)
)
# combined_snr = own rx snr / snr on dx side
combined_snr = f"{static.SNR}/{dxsnr}"
helpers.add_to_heard_stations(
static.DXCALLSIGN,
static.DXGRID,
"PING-ACK",
combined_snr,
static.FREQ_OFFSET,
static.HAMLIB_FREQUENCY,
)
self.log.info(
"[TNC] PING ACK ["
+ str(mycallsign, "UTF-8")
+ "] >|< ["
+ str(static.DXCALLSIGN, "UTF-8")
+ "]",
snr=static.SNR,
dxsnr=dxsnr,
)
static.TNC_STATE = "IDLE"
else:
self.log.info(
"[TNC] FOREIGN PING ACK ["
+ str(self.mycallsign, "UTF-8")
+ "] ??? ["
+ str(bytes(data_in[4:7]), "UTF-8")
+ "]",
snr=static.SNR,
)
def stop_transmission(self) -> None:
"""
Force a stop of the running transmission
"""
self.log.warning("[TNC] Stopping transmission!")
static.TNC_STATE = "IDLE"
static.ARQ_STATE = False
self.send_data_to_socket_queue(
freedata="tnc-message",
arq="transmission",
status="stopped",
mycallsign=str(self.mycallsign, 'UTF-8'),
dxcallsign=str(self.dxcallsign, 'UTF-8'),
)
stop_frame = bytearray(self.length_sig0_frame)
stop_frame[:1] = bytes([FR_TYPE.ARQ_STOP.value])
stop_frame[1:4] = static.DXCALLSIGN_CRC
stop_frame[4:7] = static.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=6, repeat_delay=0)
self.arq_cleanup()
def received_stop_transmission(
self, data_in: bytes
) -> None: # pylint: disable=unused-argument
"""
Received a transmission stop
"""
self.log.warning("[TNC] Stopping transmission!")
static.TNC_STATE = "IDLE"
static.ARQ_STATE = False
self.send_data_to_socket_queue(
freedata="tnc-message",
arq="transmission",
status="stopped",
mycallsign=str(self.mycallsign, 'UTF-8'),
dxcallsign=str(self.dxcallsign, 'UTF-8'),
uuid=self.transmission_uuid,
)
self.arq_cleanup()
# ----------- BROADCASTS
def run_beacon(self) -> None:
"""
Controlling function for running a beacon
Args:
self: arq class
Returns:
"""
try:
while True:
threading.Event().wait(0.5)
while static.BEACON_STATE:
if (
not static.ARQ_SESSION
and not self.arq_file_transfer
and not static.BEACON_PAUSE
):
self.send_data_to_socket_queue(
freedata="tnc-message",
beacon="transmitting",
dxcallsign="None",
interval=self.beacon_interval,
)
self.log.info(
"[TNC] Sending beacon!", interval=self.beacon_interval
)
beacon_frame = bytearray(self.length_sig0_frame)
beacon_frame[:1] = bytes([FR_TYPE.BEACON.value])
beacon_frame[1:7] = helpers.callsign_to_bytes(self.mycallsign)
beacon_frame[9:13] = static.MYGRID[:4]
self.log.info("[TNC] ENABLE FSK", state=static.ENABLE_FSK)
if static.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.datac0.value, copies=1,
repeat_delay=0)
interval_timer = time.time() + self.beacon_interval
while (
time.time() < interval_timer
and static.BEACON_STATE
and not static.BEACON_PAUSE
):
threading.Event().wait(0.01)
except Exception as err:
self.log.debug("[TNC] run_beacon: ", exception=err)
def received_beacon(self, data_in: bytes) -> None:
"""
Called if we received a beacon
Args:
data_in:bytes:
"""
# here we add the received station to the heard stations buffer
beacon_callsign = helpers.bytes_to_callsign(bytes(data_in[1:7]))
dxgrid = bytes(data_in[9:13]).rstrip(b"\x00")
self.send_data_to_socket_queue(
freedata="tnc-message",
beacon="received",
uuid=str(uuid.uuid4()),
timestamp=int(time.time()),
dxcallsign=str(beacon_callsign, "UTF-8"),
dxgrid=str(dxgrid, "UTF-8"),
snr=str(static.SNR),
)
self.log.info(
"[TNC] BEACON RCVD ["
+ str(beacon_callsign, "UTF-8")
+ "]["
+ str(dxgrid, "UTF-8")
+ "] ",
snr=static.SNR,
)
helpers.add_to_heard_stations(
beacon_callsign,
dxgrid,
"BEACON",
static.SNR,
static.FREQ_OFFSET,
static.HAMLIB_FREQUENCY,
)
def transmit_cq(self) -> None:
"""
Transmit a CQ
Args:
self
Returns:
Nothing
"""
self.log.info("[TNC] CQ CQ CQ")
self.send_data_to_socket_queue(
freedata="tnc-message",
cq="transmitting",
mycallsign=str(self.mycallsign, "UTF-8"),
dxcallsign="None",
)
cq_frame = bytearray(self.length_sig0_frame)
cq_frame[:1] = bytes([FR_TYPE.CQ.value])
cq_frame[1:7] = helpers.callsign_to_bytes(self.mycallsign)
cq_frame[7:11] = helpers.encode_grid(static.MYGRID.decode("UTF-8"))
self.log.info("[TNC] ENABLE FSK", state=static.ENABLE_FSK)
self.log.debug("[TNC] CQ Frame:", data=[cq_frame])
if static.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.datac0.value, copies=1, repeat_delay=0)
def received_cq(self, data_in: bytes) -> None:
"""
Called when we receive a CQ frame
Args:
data_in:bytes:
Returns:
Nothing
"""
# here we add the received station to the heard stations buffer
dxcallsign = helpers.bytes_to_callsign(bytes(data_in[1:7]))
self.log.debug("[TNC] received_cq:", dxcallsign=dxcallsign)
dxgrid = bytes(helpers.decode_grid(data_in[7:11]), "UTF-8")
self.send_data_to_socket_queue(
freedata="tnc-message",
cq="received",
mycallsign=str(self.mycallsign, "UTF-8"),
dxcallsign=str(dxcallsign, "UTF-8"),
dxgrid=str(static.DXGRID, "UTF-8"),
)
self.log.info(
"[TNC] CQ RCVD ["
+ str(dxcallsign, "UTF-8")
+ "]["
+ str(dxgrid, "UTF-8")
+ "] ",
snr=static.SNR,
)
helpers.add_to_heard_stations(
dxcallsign,
dxgrid,
"CQ CQ CQ",
static.SNR,
static.FREQ_OFFSET,
static.HAMLIB_FREQUENCY,
)
if static.RESPOND_TO_CQ and static.RESPOND_TO_CALL:
self.transmit_qrv(dxcallsign)
def transmit_qrv(self, dxcallsign: bytes) -> None:
"""
Called when we send a QRV frame
Args:
self,
dxcallsign
"""
# Sleep a random amount of time before responding to make it more likely to be
# heard when many stations respond. Each DATAC0 frame is 0.44 sec (440ms) in
# duration, plus overhead. Set the wait interval to be random between 0 and 2s
# in 0.5s increments.
helpers.wait(randrange(0, 20, 5) / 10.0)
self.send_data_to_socket_queue(
freedata="tnc-message",
qrv="transmitting",
dxcallsign=str(dxcallsign, "UTF-8"),
)
self.log.info("[TNC] Sending QRV!")
qrv_frame = bytearray(self.length_sig0_frame)
qrv_frame[:1] = bytes([FR_TYPE.QRV.value])
qrv_frame[1:7] = helpers.callsign_to_bytes(self.mycallsign)
qrv_frame[7:11] = helpers.encode_grid(static.MYGRID.decode("UTF-8"))
qrv_frame[11:12] = helpers.snr_to_bytes(static.SNR)
if static.ENABLE_FSK:
self.log.info("[TNC] ENABLE FSK", state=static.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.datac0.value, copies=1, repeat_delay=0)
def received_qrv(self, data_in: bytes) -> None:
"""
Called when we receive a QRV frame
Args:
data_in:bytes:
"""
# here we add the received station to the heard stations buffer
dxcallsign = helpers.bytes_to_callsign(bytes(data_in[1:7]))
dxgrid = bytes(helpers.decode_grid(data_in[7:11]), "UTF-8")
dxsnr = helpers.snr_from_bytes(data_in[11:12])
combined_snr = f"{static.SNR}/{dxsnr}"
self.send_data_to_socket_queue(
freedata="tnc-message",
qrv="received",
dxcallsign=str(dxcallsign, "UTF-8"),
dxgrid=str(dxgrid, "UTF-8"),
snr=str(static.SNR),
dxsnr=str(dxsnr)
)
self.log.info(
"[TNC] QRV RCVD ["
+ str(dxcallsign, "UTF-8")
+ "]["
+ str(dxgrid, "UTF-8")
+ "] ",
snr=static.SNR,
dxsnr=dxsnr
)
helpers.add_to_heard_stations(
dxcallsign,
dxgrid,
"QRV",
combined_snr,
static.FREQ_OFFSET,
static.HAMLIB_FREQUENCY,
)
# ------------ CALCULATE TRANSFER RATES
def calculate_transfer_rate_rx(
self, rx_start_of_transmission: float, receivedbytes: int
) -> list:
"""
Calculate transfer rate for received data
Args:
rx_start_of_transmission:float:
receivedbytes:int:
Returns: List of:
bits_per_second: float,
bytes_per_minute: float,
transmission_percent: float
"""
try:
if static.TOTAL_BYTES == 0:
static.TOTAL_BYTES = 1
static.ARQ_TRANSMISSION_PERCENT = min(
int(
(
receivedbytes
* static.ARQ_COMPRESSION_FACTOR
/ static.TOTAL_BYTES
)
* 100
),
100,
)
transmissiontime = time.time() - self.rx_start_of_transmission
if receivedbytes > 0:
static.ARQ_BITS_PER_SECOND = int((receivedbytes * 8) / transmissiontime)
static.ARQ_BYTES_PER_MINUTE = int(
receivedbytes / (transmissiontime / 60)
)
else:
static.ARQ_BITS_PER_SECOND = 0
static.ARQ_BYTES_PER_MINUTE = 0
except Exception as err:
self.log.error(f"[TNC] calculate_transfer_rate_rx: Exception: {err}")
static.ARQ_TRANSMISSION_PERCENT = 0.0
static.ARQ_BITS_PER_SECOND = 0
static.ARQ_BYTES_PER_MINUTE = 0
return [
static.ARQ_BITS_PER_SECOND,
static.ARQ_BYTES_PER_MINUTE,
static.ARQ_TRANSMISSION_PERCENT,
]
def reset_statistics(self) -> None:
"""
Reset statistics
"""
# reset ARQ statistics
static.ARQ_BYTES_PER_MINUTE_BURST = 0
static.ARQ_BYTES_PER_MINUTE = 0
static.ARQ_BITS_PER_SECOND_BURST = 0
static.ARQ_BITS_PER_SECOND = 0
static.ARQ_TRANSMISSION_PERCENT = 0
static.TOTAL_BYTES = 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:
static.ARQ_TRANSMISSION_PERCENT = min(
int((sentbytes / tx_buffer_length) * 100), 100
)
transmissiontime = time.time() - tx_start_of_transmission
if sentbytes > 0:
static.ARQ_BITS_PER_SECOND = int((sentbytes * 8) / transmissiontime)
static.ARQ_BYTES_PER_MINUTE = int(sentbytes / (transmissiontime / 60))
else:
static.ARQ_BITS_PER_SECOND = 0
static.ARQ_BYTES_PER_MINUTE = 0
except Exception as err:
self.log.error(f"[TNC] calculate_transfer_rate_tx: Exception: {err}")
static.ARQ_TRANSMISSION_PERCENT = 0.0
static.ARQ_BITS_PER_SECOND = 0
static.ARQ_BYTES_PER_MINUTE = 0
return [
static.ARQ_BITS_PER_SECOND,
static.ARQ_BYTES_PER_MINUTE,
static.ARQ_TRANSMISSION_PERCENT,
]
# ----------------------CLEANUP AND RESET FUNCTIONS
def arq_cleanup(self) -> None:
"""
Cleanup function which clears all ARQ states
"""
if TESTMODE:
self.log.debug("[TNC] TESTMODE: arq_cleanup: Not performing cleanup.")
return
self.log.debug("[TNC] arq_cleanup")
self.session_id = bytes(1)
self.rx_frame_bof_received = False
self.rx_frame_eof_received = False
self.burst_ack = False
self.rpt_request_received = False
self.data_frame_ack_received = False
static.RX_BURST_BUFFER = []
static.RX_FRAME_BUFFER = b""
self.burst_ack_snr = 255
# 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_FSK_LDPC_0 = False
modem.RECEIVE_FSK_LDPC_1 = False
# reset buffer overflow counter
static.BUFFER_OVERFLOW_COUNTER = [0, 0, 0, 0, 0]
self.is_IRS = False
self.burst_nack = False
self.burst_nack_counter = 0
self.frame_nack_counter = 0
self.frame_received_counter = 0
self.speed_level = len(self.mode_list) - 1
static.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 = 15
self.data_channel_max_retries = 15
if not static.ARQ_SESSION:
static.TNC_STATE = "IDLE"
self.dxcallsign = b"AA0AA-0"
self.mycallsign = static.MYCALLSIGN
static.ARQ_STATE = False
self.arq_file_transfer = False
static.BEACON_PAUSE = False
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:
"""
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 == FREEDV_MODE.datac1.value:
modem.RECEIVE_DATAC1 = True
modem.RECEIVE_DATAC3 = False
modem.RECEIVE_FSK_LDPC_1 = False
self.log.debug("[TNC] Changing listening data mode", mode="datac1")
elif mode == FREEDV_MODE.datac3.value:
modem.RECEIVE_DATAC1 = False
modem.RECEIVE_DATAC3 = True
modem.RECEIVE_FSK_LDPC_1 = False
self.log.debug("[TNC] Changing listening data mode", mode="datac3")
elif mode == FREEDV_MODE.fsk_ldpc_1.value:
modem.RECEIVE_DATAC1 = False
modem.RECEIVE_DATAC3 = False
modem.RECEIVE_FSK_LDPC_1 = True
self.log.debug("[TNC] Changing listening data mode", mode="fsk_ldpc_1")
else:
modem.RECEIVE_DATAC1 = True
modem.RECEIVE_DATAC3 = True
modem.RECEIVE_FSK_LDPC_1 = True
self.log.debug(
"[TNC] Changing listening data mode", mode="datac1/datac3/fsk_ldpc"
)
# ------------------------- WATCHDOG FUNCTIONS FOR TIMER
def watchdog(self) -> None:
"""Author: DJ2LS
Watchdog master function. From here, "pet" the watchdogs
"""
while True:
threading.Event().wait(0.1)
self.data_channel_keep_alive_watchdog()
self.burst_watchdog()
self.arq_session_keep_alive_watchdog()
def burst_watchdog(self) -> None:
"""
Watchdog which checks if we are running into a connection timeout
DATA BURST
"""
# IRS SIDE
# TODO: We need to redesign this part for cleaner state handling
# Return if not ARQ STATE and not ARQ SESSION STATE as they are different use cases
if (
not static.ARQ_STATE
and static.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.data_channel_last_received + self.time_list[self.speed_level]
<= time.time() or modem_error_state
):
if modem_error_state:
self.log.warning(
"[TNC] Decoding Error",
attempt=self.n_retries_per_burst,
max_attempts=self.rx_n_max_retries_per_burst,
speed_level=self.speed_level,
)
else:
self.log.warning(
"[TNC] Frame timeout",
attempt=self.n_retries_per_burst,
max_attempts=self.rx_n_max_retries_per_burst,
speed_level=self.speed_level,
)
# reduce speed level if nack counter increased
self.frame_received_counter = 0
self.burst_nack_counter += 1
if self.burst_nack_counter >= 2:
self.burst_nack_counter = 0
self.speed_level = max(self.speed_level - 1, 0)
static.ARQ_SPEED_LEVEL = self.speed_level
# Update modes we are listening to
self.set_listening_modes(True, True, self.mode_list[self.speed_level])
# Why not pass `snr` or `static.SNR`?
self.send_burst_nack_frame_watchdog(0)
# Update data_channel timestamp
# TODO: Disabled this one for testing.
# self.data_channel_last_received = time.time()
self.n_retries_per_burst += 1
else:
# print((self.data_channel_last_received + self.time_list[self.speed_level])-time.time())
pass
if self.n_retries_per_burst >= self.rx_n_max_retries_per_burst:
self.stop_transmission()
self.arq_cleanup()
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 static.ARQ_STATE and static.TNC_STATE == "BUSY":
threading.Event().wait(0.01)
if (
self.data_channel_last_received + self.transmission_timeout
> time.time()
):
timeleft = (self.data_channel_last_received + self.transmission_timeout) - time.time()
self.log.debug("Time left until timeout", seconds=timeleft)
threading.Event().wait(5)
# print(self.data_channel_last_received + self.transmission_timeout - time.time())
# pass
else:
# Clear the timeout timestamp
self.data_channel_last_received = 0
self.log.info(
"[TNC] DATA ["
+ str(self.mycallsign, "UTF-8")
+ "]<<T>>["
+ str(static.DXCALLSIGN, "UTF-8")
+ "]"
)
self.send_data_to_socket_queue(
freedata="tnc-message",
arq="transmission",
status="failed",
uuid=self.transmission_uuid,
mycallsign=str(self.mycallsign, 'UTF-8'),
dxcallsign=str(self.dxcallsign, 'UTF-8'),
)
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 (
static.ARQ_SESSION
and static.TNC_STATE == "BUSY"
and not self.arq_file_transfer
):
if self.arq_session_last_received + self.arq_session_timeout > time.time():
threading.Event().wait(0.01)
else:
self.log.info(
"[TNC] SESSION ["
+ str(self.mycallsign, "UTF-8")
+ "]<<T>>["
+ str(self.dxcallsign, "UTF-8")
+ "]"
)
self.send_data_to_socket_queue(
freedata="tnc-message",
arq="session",
status="failed",
reason="timeout",
mycallsign=str(self.mycallsign, 'UTF-8'),
dxcallsign=str(self.dxcallsign, 'UTF-8'),
)
self.close_session()
def heartbeat(self) -> None:
"""
Heartbeat thread which auto pauses and resumes the heartbeat signal when in an arq session
"""
while True:
threading.Event().wait(0.01)
# additional check for smoother stopping if heartbeat transmission
while not self.arq_file_transfer:
threading.Event().wait(0.01)
if (
static.ARQ_SESSION
and self.IS_ARQ_SESSION_MASTER
and static.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"""
self.enqueue_frame_for_tx(
frame_to_tx=[bytearray(126)], c2_mode=FREEDV_MODE.datac3.value
)
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