FreeDATA/tnc/data_handler.py

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# -*- coding: UTF-8 -*-
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"""
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
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import threading
import time
import uuid
import zlib
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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
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from exceptions import NoCallsign
from queues import DATA_QUEUE_RECEIVED, DATA_QUEUE_TRANSMIT, RX_BUFFER
from static import FRAME_TYPE as FR_TYPE
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TESTMODE = False
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class DATA:
"""Terminal Node Controller for FreeDATA"""
log = structlog.get_logger("DATA")
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def __init__(self) -> None:
# Initial call sign. Will be overwritten later
self.mycallsign = static.MYCALLSIGN
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self.data_queue_transmit = DATA_QUEUE_TRANSMIT
self.data_queue_received = DATA_QUEUE_RECEIVED
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# length of signalling frame
self.length_sig_frame = 14
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# 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
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# actual n retries of burst
self.tx_n_retry_of_burst = 0
self.transmission_uuid = ""
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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
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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"
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self.tx_n_max_retries_per_burst = 50
self.rx_n_max_retries_per_burst = 50
self.n_retries_per_burst = 0
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# 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
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# 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
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self.time_list_low_bw = [8]
# 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, 5]
# List for time to wait for corresponding mode in seconds
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self.time_list_high_bw = [8, 9]
# 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
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self.speed_level = len(self.mode_list) - 1 # speed level for selecting mode
static.ARQ_SPEED_LEVEL = self.speed_level
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self.is_IRS = False
self.burst_nack = False
self.burst_nack_counter = 0
self.frame_received_counter = 0
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self.rx_frame_bof_received = False
self.rx_frame_eof_received = False
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# 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 = 360 # transmission timeout in seconds
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# 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()
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worker_thread_receive = threading.Thread(
target=self.worker_receive, name="worker thread receive", daemon=True
)
worker_thread_receive.start()
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# START THE THREAD FOR THE TIMEOUT WATCHDOG
watchdog_thread = threading.Thread(
target=self.watchdog, name="watchdog", daemon=True
)
watchdog_thread.start()
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arq_session_thread = threading.Thread(
target=self.heartbeat, name="watchdog", daemon=True
)
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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()
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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] == "PING":
# [1] dxcallsign
self.transmit_ping(data[1])
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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
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elif data[0] == "ARQ_RAW":
# [1] DATA_OUT bytes
# [2] MODE int
# [3] N_FRAMES_PER_BURST int
# [4] self.transmission_uuid str
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# [5] mycallsign with ssid
self.open_dc_and_transmit(data[1], data[2], data[3], data[4], data[5])
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:
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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
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# bytes_out[1:4] == callsign check for signalling frames,
# bytes_out[2:5] == transmission
# we could also create an own function, which returns True.
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frametype = int.from_bytes(bytes(bytes_out[:1]), "big")
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# 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]))
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# check for session ID
_valid3 = helpers.check_session_id(self.session_id, bytes(bytes_out[1:2]))
if (
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_valid1
or _valid2
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or _valid3
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or frametype
in [
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FR_TYPE.CQ.value,
FR_TYPE.QRV.value,
FR_TYPE.PING.value,
FR_TYPE.BEACON.value,
]
):
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# CHECK IF FRAMETYPE IS BETWEEN 10 and 50 ------------------------
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# 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
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# snr = self.calculate_snr(freedv)
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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
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# 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}")
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# 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[:])
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# Unknown frame type
else:
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self.log.warning(
"[TNC] ARQ - other frame type", frametype=FR_TYPE(frametype).name
)
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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(
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self,
frame_to_tx: bytearray,
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: bytearray
: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:
time.sleep(0.01)
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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(
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freedata="tnc-message",
arq="received",
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status="success",
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uuid=self.transmission_uuid,
timestamp=timestamp,
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mycallsign=str(self.mycallsign, "UTF-8"),
dxcallsign=str(static.DXCALLSIGN, "UTF-8"),
dxgrid=str(static.DXGRID, "UTF-8"),
data=base64_data,
)
"""
self.log.debug("[TNC] send_data_to_socket_queue:", jsondata=jsondata)
json_data_out = json.dumps(jsondata)
sock.SOCKET_QUEUE.put(json_data_out)
def send_burst_ack_frame(self, snr) -> None:
"""Build and send ACK frame for burst DATA frame"""
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ack_frame = bytearray(self.length_sig_frame)
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ack_frame[:1] = bytes([FR_TYPE.BURST_ACK.value])
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# ack_frame[1:4] = static.DXCALLSIGN_CRC
# ack_frame[4:7] = static.MYCALLSIGN_CRC
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ack_frame[1:2] = self.session_id
ack_frame[7:8] = bytes([int(snr)])
ack_frame[8:9] = bytes([int(self.speed_level)])
# Transmit frame
self.enqueue_frame_for_tx(ack_frame)
def send_data_ack_frame(self, snr) -> None:
"""Build and send ACK frame for received DATA frame"""
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ack_frame = bytearray(self.length_sig_frame)
ack_frame[:1] = bytes([FR_TYPE.FR_ACK.value])
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ack_frame[1:2] = self.session_id
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# 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
self.enqueue_frame_for_tx(ack_frame, copies=3, repeat_delay=100)
def send_retransmit_request_frame(self, freedv) -> None:
# check where a None is in our burst buffer and do frame+1, beacuse 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
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# this is an idea, so it's not getting lost....
# we need to work on this
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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.
# then create a repeat frame
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rpt_frame = bytearray(self.length_sig_frame)
rpt_frame[:1] = bytes([FR_TYPE.FR_REPEAT.value])
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rpt_frame[1:2] = self.session_id
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# 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)
def send_burst_nack_frame(self, snr: float = 0) -> None:
"""Build and send NACK frame for received DATA frame"""
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nack_frame = bytearray(self.length_sig_frame)
nack_frame[:1] = bytes([FR_TYPE.FR_NACK.value])
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nack_frame[1:2] = self.session_id
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# nack_frame[1:4] = static.DXCALLSIGN_CRC
# nack_frame[4:7] = static.MYCALLSIGN_CRC
nack_frame[7:8] = bytes([int(snr)])
nack_frame[8:9] = bytes([int(self.speed_level)])
# TRANSMIT NACK FRAME FOR BURST
self.enqueue_frame_for_tx(nack_frame)
def send_burst_nack_frame_watchdog(self, snr: float = 0) -> None:
"""Build and send NACK frame for watchdog timeout"""
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nack_frame = bytearray(self.length_sig_frame)
nack_frame[:1] = bytes([FR_TYPE.BURST_NACK.value])
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nack_frame[1:2] = self.session_id
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# nack_frame[1:4] = static.DXCALLSIGN_CRC
# nack_frame[4:7] = static.MYCALLSIGN_CRC
nack_frame[7:8] = bytes([int(snr)])
nack_frame[8:9] = bytes([int(self.speed_level)])
# TRANSMIT NACK FRAME FOR BURST
self.enqueue_frame_for_tx(nack_frame)
def send_disconnect_frame(self) -> None:
"""Build and send a disconnect frame"""
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disconnection_frame = bytearray(self.length_sig_frame)
disconnection_frame[:1] = bytes([FR_TYPE.ARQ_SESSION_CLOSE.value])
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disconnection_frame[1:2] = self.session_id
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# disconnection_frame[1:4] = static.DXCALLSIGN_CRC
# disconnection_frame[4:7] = static.MYCALLSIGN_CRC
disconnection_frame[7:13] = helpers.callsign_to_bytes(self.mycallsign)
self.enqueue_frame_for_tx(disconnection_frame, copies=5, repeat_delay=250)
def arq_data_received(
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self, data_in: bytes, bytes_per_frame: int, snr: float, freedv
) -> None:
"""
Args:
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data_in:bytes:
bytes_per_frame:int:
snr:float:
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freedv:
Returns:
"""
# We've arrived here from process_data which already checked that the frame
# is intended for this station.
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data_in = bytes(data_in)
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# get received crc for different mycall ssids
# check if callsign ssid override
_, mycallsign = helpers.check_callsign(
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self.mycallsign, data_in[2:5]
)
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# only process data if we are in ARQ and BUSY state else return to quit
if not static.ARQ_STATE and static.TNC_STATE != "BUSY":
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())
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# Extract some important data from the frame
# Get sequence number of burst frame
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rx_n_frame_of_burst = int.from_bytes(bytes(data_in[:1]), "big") - 10
# Get number of bursts from received frame
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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
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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]
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static.RX_BURST_BUFFER[rx_n_frame_of_burst] = data_in[8:] # type: ignore
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self.log.debug("[TNC] static.RX_BURST_BUFFER", buffer=static.RX_BURST_BUFFER)
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helpers.add_to_heard_stations(
static.DXCALLSIGN,
static.DXGRID,
"DATA-CHANNEL",
snr,
static.FREQ_OFFSET,
static.HAMLIB_FREQUENCY,
)
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# 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 recevied data
temp_burst_buffer = b""
for value in static.RX_BURST_BUFFER:
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# 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 = []
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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
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# static.RX_FRAME_BUFFER --> existing data
# temp_burst_buffer --> new data
# search_area --> area where we want to search
search_area = 510
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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[
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: 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")
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# Check if we didn't receive a BOF and EOF yet to avoid sending
# ack frames if we already received all data
if (
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not self.rx_frame_bof_received
and not self.rx_frame_eof_received
and data_in.find(self.data_frame_eof) < 0
):
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self.frame_received_counter += 1
if self.frame_received_counter >= 2:
self.frame_received_counter = 0
self.speed_level = min(
self.speed_level + 1, len(self.mode_list) - 1
)
static.ARQ_SPEED_LEVEL = self.speed_level
# Update modes we are listening to
self.set_listening_modes(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
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self.n_retries_per_burst = 0
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# calculate statistics
self.calculate_transfer_rate_rx(
self.rx_start_of_transmission, len(static.RX_FRAME_BUFFER)
)
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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:",
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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)
)
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# Should never reach this point
else:
self.log.error(
"[TNC] data_handler: Should not reach this point...",
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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.
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# In case of loosing data, but we received already a BOF and EOF we need to make sure, we
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# 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 recevied a frame with a BOF
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if bof_position >= 0:
payload = static.RX_FRAME_BUFFER[
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bof_position + len(self.data_frame_bof): eof_position
]
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frame_length = int.from_bytes(payload[4:8], "big") # 4:8 4bytes
static.TOTAL_BYTES = frame_length
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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 (
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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,
)
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self.rx_frame_bof_received = True
self.rx_frame_eof_received = True
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# Extract raw data from buffer
payload = static.RX_FRAME_BUFFER[
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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)
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# Check if data_frame_crc is equal with received crc
if data_frame_crc == data_frame_crc_received:
self.log.info("[TNC] ARQ | RX | DATA FRAME SUCESSFULLY RECEIVED")
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# Decompress the data frame
data_frame_decompressed = zlib.decompress(data_frame)
static.ARQ_COMPRESSION_FACTOR = len(data_frame_decompressed) / len(
data_frame
)
data_frame = data_frame_decompressed
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self.transmission_uuid = str(uuid.uuid4())
timestamp = int(time.time())
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# 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 = 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=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
)
RX_BUFFER.put(
[
self.transmission_uuid,
timestamp,
static.DXCALLSIGN,
static.DXGRID,
base64_data,
]
)
self.send_data_to_socket_queue(
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freedata="tnc-message",
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arq="transmission",
status="received",
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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,
)
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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:
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self.send_data_to_socket_queue(
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freedata="tnc-message",
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arq="transmission",
status="failed",
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uuid=self.transmission_uuid,
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)
self.log.warning(
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"[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,
)
self.log.info("[TNC] ARQ | RX | Sending NACK")
self.send_burst_nack_frame(snr)
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# Update arq_session timestamp
self.arq_session_last_received = int(time.time())
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# Finally cleanup our buffers and states,
self.arq_cleanup()
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def arq_transmit(self, data_out: bytes, mode: int, n_frames_per_burst: int):
"""
Transmit ARQ frame
Args:
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data_out:bytes:
mode:int:
n_frames_per_burst:int:
"""
self.arq_file_transfer = True
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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
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# 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")
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self.send_data_to_socket_queue(
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freedata="tnc-message",
arq="transmission",
status="transmitting",
uuid=self.transmission_uuid,
percent=static.ARQ_TRANSMISSION_PERCENT,
bytesperminute=static.ARQ_BYTES_PER_MINUTE,
)
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self.log.info(
"[TNC] | TX | DATACHANNEL",
Bytes=static.TOTAL_BYTES,
)
# Compress data frame
data_frame_compressed = zlib.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)])
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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))
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# 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 = (
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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:
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# 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
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# self.log.debug("[TNC] FIXED MODE:", mode=FREEDV_MODE(data_mode).name)
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# 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)
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static.ARQ_SPEED_LEVEL = self.speed_level
data_mode = self.mode_list[self.speed_level]
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self.log.debug(
"[TNC] Speed-level:",
level=self.speed_level,
retry=self.tx_n_retry_of_burst,
mode=FREEDV_MODE(data_mode).name,
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)
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# Payload information
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payload_per_frame = modem.get_bytes_per_frame(data_mode) - 2
# Tempbuffer list for storing our data frames
tempbuffer = []
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# Append data frames with n_frames_per_burst to tempbuffer
# TODO: this part needs a complete rewrite!
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# n_frames_per_burst = 1 is working
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arqheader = bytearray()
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# arqheader[:1] = bytes([FR_TYPE.BURST_01.value + i])
arqheader[:1] = bytes([FR_TYPE.BURST_01.value])
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arqheader[1:2] = bytes([n_frames_per_burst])
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arqheader[2:3] = self.session_id
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# arqheader[2:5] = static.DXCALLSIGN_CRC
# arqheader[5:8] = static.MYCALLSIGN_CRC
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bufferposition_end = bufferposition + payload_per_frame - len(arqheader)
# Normal condition
if bufferposition_end <= len(data_out):
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frame = data_out[bufferposition:bufferposition_end]
frame = arqheader + frame
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# Pad the last bytes of a frame
else:
extended_data_out = data_out[bufferposition:]
extended_data_out += bytes([0]) * (
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payload_per_frame - len(extended_data_out) - len(arqheader)
)
frame = arqheader + extended_data_out
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# Append frame to tempbuffer for transmission
tempbuffer.append(frame)
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self.log.debug("[TNC] tempbuffer:", tempbuffer=tempbuffer)
self.log.info(
"[TNC] ARQ | TX | FRAMES",
mode=FREEDV_MODE(data_mode).name,
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fpb=n_frames_per_burst,
retry=self.tx_n_retry_of_burst,
)
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for t_buf_item in tempbuffer:
self.enqueue_frame_for_tx(t_buf_item, c2_mode=data_mode)
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# After transmission finished, wait for an ACK or RPT frame
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# 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):
# time.sleep(0.01)
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# burstacktimeout = time.time() + self.burst_ack_timeout_seconds + 100
while static.ARQ_STATE and not (
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self.burst_ack
or self.burst_nack
or self.rpt_request_received
or self.data_frame_ack_received
):
time.sleep(0.01)
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# Once we receive a burst ack, reset its state and break the RETRIES loop
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if self.burst_ack:
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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."
)
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break # break retry loop
if self.burst_nack:
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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."
)
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break # break retry loop
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# We need this part for leaving the repeat loop
# static.ARQ_STATE == "DATA" --> when stopping transmission manually
if not static.ARQ_STATE:
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# print("not ready for data...leaving loop....")
self.log.debug(
"[TNC] arq_transmit: ARQ State changed to FALSE. Breaking retry loop."
)
break
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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,
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maxretries=self.tx_n_max_retries_per_burst,
overflows=static.BUFFER_OVERFLOW_COUNTER,
)
# End of FOR loop
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# update buffer position
bufferposition = bufferposition_end
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# update stats
self.calculate_transfer_rate_tx(
tx_start_of_transmission, bufferposition_end, len(data_out)
)
self.send_data_to_socket_queue(
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freedata="tnc-message",
arq="transmission",
status="transmitting",
uuid=self.transmission_uuid,
percent=static.ARQ_TRANSMISSION_PERCENT,
bytesperminute=static.ARQ_BYTES_PER_MINUTE,
)
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# 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
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# GOING TO NEXT ITERATION
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if self.data_frame_ack_received:
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# 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
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time.sleep(0.2)
self.send_data_to_socket_queue(
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freedata="tnc-message",
arq="transmission",
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status="transmitted",
uuid=self.transmission_uuid,
percent=static.ARQ_TRANSMISSION_PERCENT,
bytesperminute=static.ARQ_BYTES_PER_MINUTE,
)
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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,
)
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else:
self.send_data_to_socket_queue(
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freedata="tnc-message",
arq="transmission",
status="failed",
uuid=self.transmission_uuid,
percent=static.ARQ_TRANSMISSION_PERCENT,
bytesperminute=static.ARQ_BYTES_PER_MINUTE,
)
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self.log.info(
"[TNC] ARQ | TX | TRANSMISSION FAILED OR TIME OUT!",
overflows=static.BUFFER_OVERFLOW_COUNTER,
)
self.stop_transmission()
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# 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 a ACK/NACK for a transmitted frame, keep track and
make adjustments to speed level if needed.
Args:
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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)
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# 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:
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# Decrease speed level if we received a burst nack
# self.speed_level = max(self.speed_level - 1, 0)
# Set flag to retry frame again.
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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())
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self.burst_ack_snr = int.from_bytes(bytes(data_in[7:8]), "big")
self.speed_level = int.from_bytes(bytes(data_in[8:9]), "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,
)
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def frame_ack_received(
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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
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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(
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self, data_in: bytes # pylint: disable=unused-argument
) -> None:
"""
Received a NACK for a transmitted frame
Args:
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data_in:bytes:
"""
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(
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freedata="tnc-message",
arq="transmission",
status="failed",
uuid=self.transmission_uuid,
percent=static.ARQ_TRANSMISSION_PERCENT,
bytesperminute=static.ARQ_BYTES_PER_MINUTE,
)
# Update data_channel timestamp
self.arq_session_last_received = int(time.time())
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self.arq_cleanup()
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def burst_rpt_received(self, data_in: bytes):
"""
Repeat request frame received for transmitted frame
Args:
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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,
)
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self.rpt_request_received = True
# Update data_channel timestamp
self.data_channel_last_received = int(time.time())
self.rpt_request_buffer = []
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missing_area = bytes(data_in[3:12]) # 1:9
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for i in range(0, 6, 2):
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if not missing_area[i: i + 2].endswith(b"\x00\x00"):
missing = missing_area[i: i + 2]
self.rpt_request_buffer.insert(0, missing)
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############################################################################################################
# ARQ SESSION HANDLER
############################################################################################################
def arq_session_handler(self) -> 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
"""
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# 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(static.DXCALLSIGN, "UTF-8")
+ "]",
state=static.ARQ_SESSION_STATE,
)
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self.open_session()
# wait until data channel is open
while not static.ARQ_SESSION and not self.arq_session_timeout:
time.sleep(0.01)
static.ARQ_SESSION_STATE = "connecting"
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self.send_data_to_socket_queue(
freedata="tnc-message",
arq="session",
status="connecting",
)
if static.ARQ_SESSION and static.ARQ_SESSION_STATE == "connected":
# static.ARQ_SESSION_STATE = "connected"
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self.send_data_to_socket_queue(
freedata="tnc-message",
arq="session",
status="connected",
)
return True
static.ARQ_SESSION_STATE = "failed"
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self.send_data_to_socket_queue(
freedata="tnc-message",
arq="session",
status="failed",
reason="timeout",
)
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"
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# create a random session id
self.session_id = randbytes(1)
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connection_frame = bytearray(self.length_sig_frame)
connection_frame[:1] = bytes([FR_TYPE.ARQ_SESSION_OPEN.value])
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connection_frame[1:2] = self.session_id
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# connection_frame[1:4] = static.DXCALLSIGN_CRC
# connection_frame[4:7] = static.MYCALLSIGN_CRC
connection_frame[7:13] = helpers.callsign_to_bytes(self.mycallsign)
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while not static.ARQ_SESSION:
time.sleep(0.01)
for attempt in range(self.session_connect_max_retries):
self.log.info(
"[TNC] SESSION ["
+ str(self.mycallsign, "UTF-8")
+ "]>>?<<["
+ str(static.DXCALLSIGN, "UTF-8")
+ "]",
a=attempt + 1, # Adjust for 0-based for user display
state=static.ARQ_SESSION_STATE,
)
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self.enqueue_frame_for_tx(connection_frame)
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# Wait for a time, looking to see if `static.ARQ_SESSION`
# indicates we've received a positive response from the far station.
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timeout = time.time() + 3
while time.time() < timeout:
time.sleep(0.01)
# Stop waiting if data channel is opened
if static.ARQ_SESSION:
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return True
# Session connect timeout, send close_session frame to
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# attempt to clean up the far-side, if it received the
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# open_session frame and can still hear us.
if not static.ARQ_SESSION:
self.close_session()
return False
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# Given the while condition, it will only exit when `static.ARQ_SESSION` is True
return True
def received_session_opener(self, data_in: bytes) -> None:
"""
Received a session open request packet.
Args:
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data_in:bytes:
"""
self.IS_ARQ_SESSION_MASTER = False
static.ARQ_SESSION_STATE = "connecting"
# Update arq_session timestamp
self.arq_session_last_received = int(time.time())
static.DXCALLSIGN_CRC = bytes(data_in[4:7])
static.DXCALLSIGN = helpers.bytes_to_callsign(bytes(data_in[7:13]))
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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(static.DXCALLSIGN, "UTF-8")
+ "]",
state=static.ARQ_SESSION_STATE,
)
static.ARQ_SESSION = True
static.TNC_STATE = "BUSY"
self.transmit_session_heartbeat()
def close_session(self) -> None:
"""Close the ARQ session"""
static.ARQ_SESSION_STATE = "disconnecting"
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")
+ "]<<X>>["
+ str(static.DXCALLSIGN, "UTF-8")
+ "]",
state=static.ARQ_SESSION_STATE,
)
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self.send_data_to_socket_queue(
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freedata="tnc-message",
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arq="session",
status="close",
)
self.IS_ARQ_SESSION_MASTER = False
static.ARQ_SESSION = False
self.arq_cleanup()
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self.send_disconnect_frame()
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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:
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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, _ = helpers.check_callsign(static.DXCALLSIGN, bytes(data_in[4:7]))
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_valid_session = helpers.check_session_id(self.session_id, bytes(data_in[1:2]))
if _valid_crc or _valid_session:
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(self.mycallsign, "UTF-8")
+ "]<<X>>["
+ str(static.DXCALLSIGN, "UTF-8")
+ "]",
state=static.ARQ_SESSION_STATE,
)
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self.send_data_to_socket_queue(
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freedata="tnc-message",
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arq="session",
status="close",
)
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"""
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# static.ARQ_SESSION = True
# static.TNC_STATE = "BUSY"
# static.ARQ_SESSION_STATE = "connected"
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connection_frame = bytearray(self.length_sig_frame)
connection_frame[:1] = bytes([FR_TYPE.ARQ_SESSION_HB.value])
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connection_frame[1:2] = self.session_id
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# connection_frame[1:4] = static.DXCALLSIGN_CRC
# connection_frame[4:7] = static.MYCALLSIGN_CRC
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self.enqueue_frame_for_tx(connection_frame)
def received_session_heartbeat(self, data_in: bytes) -> None:
"""
Received an ARQ session heartbeat, record and update state accordingly.
Args:
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data_in:bytes:
"""
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# Accept session data if the DXCALLSIGN_CRC matches the station in static or session id.
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_valid_crc, _ = helpers.check_callsign(static.DXCALLSIGN, bytes(data_in[4:7]))
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_valid_session = helpers.check_session_id(self.session_id, bytes(data_in[1:2]))
if _valid_crc or _valid_session:
self.log.debug("[TNC] Received session heartbeat")
helpers.add_to_heard_stations(
static.DXCALLSIGN,
static.DXGRID,
"SESSION-HB",
static.SNR,
static.FREQ_OFFSET,
static.HAMLIB_FREQUENCY,
)
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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())
if not self.IS_ARQ_SESSION_MASTER and not self.arq_file_transfer:
self.transmit_session_heartbeat()
##########################################################################################################
# ARQ DATA CHANNEL HANDLER
##########################################################################################################
def open_dc_and_transmit(
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self,
data_out: bytes,
mode: int,
n_frames_per_burst: int,
transmission_uuid: str,
mycallsign,
) -> bool:
"""
Open data channel and transmit data
Args:
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data_out:bytes:
mode:int:
n_frames_per_burst:int:
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transmission_uuid:str:
mycallsign:bytes:
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
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static.TNC_STATE = "BUSY"
self.arq_file_transfer = True
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self.transmission_uuid = transmission_uuid
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# wait a moment for the case, a heartbeat is already on the way back to us
if static.ARQ_SESSION:
time.sleep(0.5)
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self.datachannel_timeout = False
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# we need to compress data for gettin a compression factor.
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# 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(zlib.compress(data_out))
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self.arq_open_data_channel(mode, n_frames_per_burst, mycallsign)
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# wait until data channel is open
while not static.ARQ_STATE and not self.datachannel_timeout:
time.sleep(0.01)
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if static.ARQ_STATE:
self.arq_transmit(data_out, mode, n_frames_per_burst)
return True
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return False
def arq_open_data_channel(
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self, mode: int, n_frames_per_burst: int, mycallsign
) -> bool:
"""
Open an ARQ data channel.
Args:
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mode:int:
n_frames_per_burst:int:
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mycallsign:bytes:
Returns:
True if the data channel was opened successfully
False if the data channel failed to open
"""
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self.is_IRS = False
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# init a new random session id if we are not in an arq session
if not static.ARQ_SESSION:
self.session_id = randbytes(1)
print(self.session_id)
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# Update data_channel timestamp
self.data_channel_last_received = int(time.time())
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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")
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connection_frame = bytearray(self.length_sig_frame)
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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)
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# connection_frame[13:14] = bytes([n_frames_per_burst])
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connection_frame[13:14] = self.session_id
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while not static.ARQ_STATE:
time.sleep(0.01)
for attempt in range(self.data_channel_max_retries):
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self.send_data_to_socket_queue(
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freedata="tnc-message",
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arq="transmission",
status="opening",
)
self.log.info(
"[TNC] ARQ | DATA | TX | ["
+ str(mycallsign, "UTF-8")
+ "]>> <<["
+ str(static.DXCALLSIGN, "UTF-8")
+ "]",
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attempt=f"{str(attempt + 1)}/{str(self.data_channel_max_retries)}",
)
self.enqueue_frame_for_tx(connection_frame)
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timeout = time.time() + 4
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while time.time() < timeout:
time.sleep(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
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self.log.debug(
"[TNC] arq_open_data_channel:", transmission_uuid=self.transmission_uuid
)
self.send_data_to_socket_queue(
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freedata="tnc-message",
arq="transmission",
status="failed",
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reason="unknown",
uuid=self.transmission_uuid,
percent=static.ARQ_TRANSMISSION_PERCENT,
bytesperminute=static.ARQ_BYTES_PER_MINUTE,
)
self.log.warning(
"[TNC] ARQ | TX | DATA ["
+ str(mycallsign, "UTF-8")
+ "]>>X<<["
+ str(static.DXCALLSIGN, "UTF-8")
+ "]"
)
self.datachannel_timeout = True
self.arq_cleanup()
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# Attempt to cleanup the far-side, if it received the
# open_session frame and can still hear us.
self.close_session()
return False
# Shouldn't get here..
return True
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def arq_received_data_channel_opener(self, data_in: bytes):
"""
Received request to open data channel framt
Args:
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data_in:bytes:
"""
# We've arrived here from process_data which already checked that the frame
# is intended for this station.
self.arq_file_transfer = True
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self.is_IRS = True
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self.send_data_to_socket_queue(
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freedata="tnc-message",
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arq="transmission",
status="opening",
)
static.DXCALLSIGN_CRC = bytes(data_in[4:7])
static.DXCALLSIGN = helpers.bytes_to_callsign(bytes(data_in[7:13]))
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# 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")
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# 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
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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
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self.mode_list = self.mode_list_low_bw
self.time_list = self.time_list_low_bw
self.snr_list = self.snr_list_low_bw
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# get mode which fits to given SNR
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# 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
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self.log.debug(
"[TNC] calculated speed level",
speed_level=self.speed_level,
given_snr=static.SNR,
min_snr=self.snr_list[self.speed_level],
)
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# Update modes we are listening to
self.set_listening_modes(self.mode_list[self.speed_level])
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helpers.add_to_heard_stations(
static.DXCALLSIGN,
static.DXGRID,
"DATA-CHANNEL",
static.SNR,
static.FREQ_OFFSET,
static.HAMLIB_FREQUENCY,
)
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self.session_id = data_in[13:14]
print(self.session_id)
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# check if callsign ssid override
_, mycallsign = helpers.check_callsign(self.mycallsign, data_in[1:4])
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self.log.info(
"[TNC] ARQ | DATA | RX | ["
+ str(mycallsign, "UTF-8")
+ "]>> <<["
+ str(static.DXCALLSIGN, "UTF-8")
+ "]",
channel_constellation=constellation,
)
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static.ARQ_STATE = True
static.TNC_STATE = "BUSY"
self.reset_statistics()
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# 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")
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connection_frame = bytearray(self.length_sig_frame)
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connection_frame[:1] = frametype
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connection_frame[1:2] = self.session_id
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# 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])
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self.enqueue_frame_for_tx(connection_frame)
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self.log.info(
"[TNC] ARQ | DATA | RX | ["
+ str(mycallsign, "UTF-8")
+ "]>>|<<["
+ str(static.DXCALLSIGN, "UTF-8")
+ "]",
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bandwidth="wide",
snr=static.SNR,
)
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# set start of transmission for our statistics
self.rx_start_of_transmission = time.time()
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# Update data_channel timestamp
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self.data_channel_last_received = int(time.time())
def arq_received_channel_is_open(self, data_in: bytes) -> None:
"""
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Called if we received a data channel opener
Args:
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data_in:bytes:
"""
protocol_version = int.from_bytes(bytes(data_in[13:14]), "big")
if protocol_version == static.ARQ_PROTOCOL_VERSION:
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self.send_data_to_socket_queue(
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freedata="tnc-message",
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arq="transmission",
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status="opened",
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)
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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
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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
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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)
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# 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(static.DXCALLSIGN, "UTF-8")
+ "]",
snr=static.SNR,
)
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# 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
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self.send_data_to_socket_queue(
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freedata="tnc-message",
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arq="transmission",
status="failed",
reason="protocol version missmatch",
)
# 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()
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# ---------- PING
def transmit_ping(self, dxcallsign: bytes) -> None:
"""
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Funktion for controlling pings
Args:
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dxcallsign:bytes:
"""
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if not str(dxcallsign).strip():
# TODO: We should display a message to this effect on the UI.
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self.log.warning("[TNC] Missing required callsign", dxcallsign=dxcallsign)
return
static.DXCALLSIGN = dxcallsign
static.DXCALLSIGN_CRC = helpers.get_crc_24(static.DXCALLSIGN)
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self.send_data_to_socket_queue(freedata="tnc-message", ping="transmitting")
self.log.info(
"[TNC] PING REQ ["
+ str(self.mycallsign, "UTF-8")
+ "] >>> ["
+ str(static.DXCALLSIGN, "UTF-8")
+ "]"
)
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ping_frame = bytearray(self.length_sig_frame)
ping_frame[:1] = bytes([FR_TYPE.PING.value])
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ping_frame[1:4] = static.DXCALLSIGN_CRC
ping_frame[4:7] = static.MYCALLSIGN_CRC
ping_frame[7:13] = helpers.callsign_to_bytes(self.mycallsign)
self.log.info("[TNC] ENABLE FSK", state=static.ENABLE_FSK)
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if static.ENABLE_FSK:
self.enqueue_frame_for_tx(ping_frame, c2_mode=FREEDV_MODE.fsk_ldpc_0.value)
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else:
self.enqueue_frame_for_tx(ping_frame, c2_mode=FREEDV_MODE.datac0.value)
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def received_ping(self, data_in: bytes) -> None:
"""
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Called if we received a ping
Args:
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data_in:bytes:
"""
dxcallsign_CRC = bytes(data_in[4:7])
dxcallsign = helpers.bytes_to_callsign(bytes(data_in[7:13]))
helpers.add_to_heard_stations(
dxcallsign,
static.DXGRID,
"PING",
static.SNR,
static.FREQ_OFFSET,
static.HAMLIB_FREQUENCY,
)
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self.send_data_to_socket_queue(
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freedata="tnc-message",
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ping="received",
uuid=str(uuid.uuid4()),
timestamp=int(time.time()),
mycallsign=str(self.mycallsign, "UTF-8"),
dxcallsign=str(dxcallsign, "UTF-8"),
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dxgrid=str(static.DXGRID, "UTF-8"),
snr=str(static.SNR),
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)
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# check if callsign ssid override
valid, mycallsign = helpers.check_callsign(self.mycallsign, data_in[1:4])
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if not valid:
# PING packet not for me.
self.log.debug("[TNC] received_ping: ping not for this station.")
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return
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static.DXCALLSIGN_CRC = dxcallsign_CRC
static.DXCALLSIGN = dxcallsign
self.log.info(
"[TNC] PING REQ ["
+ str(mycallsign, "UTF-8")
+ "] <<< ["
+ str(static.DXCALLSIGN, "UTF-8")
+ "]",
snr=static.SNR,
)
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ping_frame = bytearray(self.length_sig_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
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self.log.info("[TNC] ENABLE FSK", state=static.ENABLE_FSK)
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if static.ENABLE_FSK:
self.enqueue_frame_for_tx(ping_frame, c2_mode=FREEDV_MODE.fsk_ldpc_0.value)
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else:
self.enqueue_frame_for_tx(ping_frame, c2_mode=FREEDV_MODE.datac0.value)
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def received_ping_ack(self, data_in: bytes) -> None:
"""
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Called if a PING ack has been received
Args:
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data_in:bytes:
"""
static.DXCALLSIGN_CRC = bytes(data_in[4:7])
static.DXGRID = bytes(data_in[7:13]).rstrip(b"\x00")
self.send_data_to_socket_queue(
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freedata="tnc-message",
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ping="acknowledge",
uuid=str(uuid.uuid4()),
timestamp=int(time.time()),
mycallsign=str(self.mycallsign, "UTF-8"),
dxcallsign=str(static.DXCALLSIGN, "UTF-8"),
dxgrid=str(static.DXGRID, "UTF-8"),
snr=str(static.SNR),
)
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helpers.add_to_heard_stations(
static.DXCALLSIGN,
static.DXGRID,
"PING-ACK",
static.SNR,
static.FREQ_OFFSET,
static.HAMLIB_FREQUENCY,
)
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self.log.info(
"[TNC] PING ACK ["
+ str(self.mycallsign, "UTF-8")
+ "] >|< ["
+ str(static.DXCALLSIGN, "UTF-8")
+ "]",
snr=static.SNR,
)
static.TNC_STATE = "IDLE"
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def stop_transmission(self) -> None:
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"""
Force a stop of the running transmission
"""
self.log.warning("[TNC] Stopping transmission!")
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stop_frame = bytearray(self.length_sig_frame)
stop_frame[:1] = bytes([FR_TYPE.ARQ_STOP.value])
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# stop_frame[1:4] = static.DXCALLSIGN_CRC
# stop_frame[4:7] = static.MYCALLSIGN_CRC
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stop_frame[1:2] = self.session_id
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stop_frame[7:13] = helpers.callsign_to_bytes(self.mycallsign)
self.enqueue_frame_for_tx(stop_frame, copies=2, repeat_delay=250)
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static.TNC_STATE = "IDLE"
static.ARQ_STATE = False
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self.send_data_to_socket_queue(
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freedata="tnc-message",
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arq="transmission",
status="stopped",
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)
self.arq_cleanup()
def received_stop_transmission(
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self, data_in: bytes
) -> None: # pylint: disable=unused-argument
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"""
Received a transmission stop
"""
self.log.warning("[TNC] Stopping transmission!")
static.TNC_STATE = "IDLE"
static.ARQ_STATE = False
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self.send_data_to_socket_queue(
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freedata="tnc-message",
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arq="transmission",
status="stopped",
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uuid=self.transmission_uuid,
mycallsign=str(self.mycallsign, "UTF-8"),
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dxcallsign=str(static.DXCALLSIGN, "UTF-8"),
)
self.arq_cleanup()
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# ----------- BROADCASTS
def run_beacon(self) -> None:
"""
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Controlling function for running a beacon
Args:
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self: arq class
Returns:
"""
try:
while True:
time.sleep(0.5)
while static.BEACON_STATE:
if (
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not static.ARQ_SESSION
and not self.arq_file_transfer
and not static.BEACON_PAUSE
):
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self.send_data_to_socket_queue(
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freedata="tnc-message",
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beacon="transmitting",
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interval=self.beacon_interval,
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)
self.log.info(
"[TNC] Sending beacon!", interval=self.beacon_interval
)
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beacon_frame = bytearray(self.length_sig_frame)
beacon_frame[:1] = bytes([FR_TYPE.BEACON.value])
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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)
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if static.ENABLE_FSK:
self.enqueue_frame_for_tx(
beacon_frame,
c2_mode=FREEDV_MODE.fsk_ldpc_0.value,
)
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else:
self.enqueue_frame_for_tx(beacon_frame)
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interval_timer = time.time() + self.beacon_interval
while (
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time.time() < interval_timer
and static.BEACON_STATE
and not static.BEACON_PAUSE
):
time.sleep(0.01)
except Exception as err:
self.log.debug("[TNC] run_beacon: ", exception=err)
def received_beacon(self, data_in: bytes) -> None:
"""
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Called if we received a beacon
Args:
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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(data_in[9:13]).rstrip(b"\x00")
self.send_data_to_socket_queue(
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freedata="tnc-message",
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beacon="received",
uuid=str(uuid.uuid4()),
timestamp=int(time.time()),
mycallsign=str(self.mycallsign, "UTF-8"),
dxcallsign=str(dxcallsign, "UTF-8"),
dxgrid=str(dxgrid, "UTF-8"),
snr=str(static.SNR),
)
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self.log.info(
"[TNC] BEACON RCVD ["
+ str(dxcallsign, "UTF-8")
+ "]["
+ str(dxgrid, "UTF-8")
+ "] ",
snr=static.SNR,
)
helpers.add_to_heard_stations(
dxcallsign,
dxgrid,
"BEACON",
static.SNR,
static.FREQ_OFFSET,
static.HAMLIB_FREQUENCY,
)
def transmit_cq(self) -> None:
"""
Transmit a CQ
Args:
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self
Returns:
Nothing
"""
self.log.info("[TNC] CQ CQ CQ")
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self.send_data_to_socket_queue(
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freedata="tnc-message",
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cq="transmitting",
)
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cq_frame = bytearray(self.length_sig_frame)
cq_frame[:1] = bytes([FR_TYPE.CQ.value])
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cq_frame[1:7] = helpers.callsign_to_bytes(self.mycallsign)
cq_frame[7:11] = helpers.encode_grid(static.MYGRID.decode("UTF-8"))
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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)
def received_cq(self, data_in: bytes) -> None:
"""
Called when we receive a CQ frame
Args:
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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")
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self.send_data_to_socket_queue(
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freedata="tnc-message",
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cq="received",
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mycallsign=str(self.mycallsign, "UTF-8"),
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dxcallsign=str(static.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:
self.transmit_qrv()
def transmit_qrv(self) -> None:
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"""
Called when we send a QRV frame
Args:
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self
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"""
# 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)
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self.send_data_to_socket_queue(
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freedata="tnc-message",
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qrv="transmitting",
)
self.log.info("[TNC] Sending QRV!")
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qrv_frame = bytearray(self.length_sig_frame)
qrv_frame[:1] = bytes([FR_TYPE.QRV.value])
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qrv_frame[1:7] = helpers.callsign_to_bytes(self.mycallsign)
qrv_frame[7:11] = helpers.encode_grid(static.MYGRID.decode("UTF-8"))
self.log.info("[TNC] ENABLE FSK", state=static.ENABLE_FSK)
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if static.ENABLE_FSK:
self.enqueue_frame_for_tx(qrv_frame, c2_mode=FREEDV_MODE.fsk_ldpc_0.value)
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else:
self.enqueue_frame_for_tx(qrv_frame)
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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")
self.send_data_to_socket_queue(
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freedata="tnc-message",
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qrv="received",
)
self.log.info(
"[TNC] QRV RCVD ["
+ str(dxcallsign, "UTF-8")
+ "]["
+ str(dxgrid, "UTF-8")
+ "] ",
snr=static.SNR,
)
helpers.add_to_heard_stations(
dxcallsign,
dxgrid,
"QRV",
static.SNR,
static.FREQ_OFFSET,
static.HAMLIB_FREQUENCY,
)
# ------------ CALUCLATE TRANSFER RATES
def calculate_transfer_rate_rx(
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self, rx_start_of_transmission: float, receivedbytes: int
) -> list:
"""
Calculate transfer rate for received data
Args:
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rx_start_of_transmission:float:
receivedbytes:int:
Returns: List of:
bits_per_second: float,
bytes_per_minute: float,
transmission_percent: float
"""
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try:
if static.TOTAL_BYTES == 0:
static.TOTAL_BYTES = 1
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static.ARQ_TRANSMISSION_PERCENT = min(
int(
(
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receivedbytes
* static.ARQ_COMPRESSION_FACTOR
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/ static.TOTAL_BYTES
)
* 100
),
100,
)
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transmissiontime = time.time() - self.rx_start_of_transmission
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if receivedbytes > 0:
static.ARQ_BITS_PER_SECOND = int((receivedbytes * 8) / transmissiontime)
static.ARQ_BYTES_PER_MINUTE = int(
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receivedbytes / (transmissiontime / 60)
)
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else:
static.ARQ_BITS_PER_SECOND = 0
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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
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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:
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"""
Reset statistics
"""
# reset ARQ statistics
static.ARQ_BYTES_PER_MINUTE_BURST = 0
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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
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def calculate_transfer_rate_tx(
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self, tx_start_of_transmission: float, sentbytes: int, tx_buffer_length: int
) -> list:
"""
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Calculate transfer rate for transmission
Args:
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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
)
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transmissiontime = time.time() - tx_start_of_transmission
if sentbytes > 0:
static.ARQ_BITS_PER_SECOND = int((sentbytes * 8) / transmissiontime)
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static.ARQ_BYTES_PER_MINUTE = int(sentbytes / (transmissiontime / 60))
else:
static.ARQ_BITS_PER_SECOND = 0
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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
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return [
static.ARQ_BITS_PER_SECOND,
static.ARQ_BYTES_PER_MINUTE,
static.ARQ_TRANSMISSION_PERCENT,
]
# ----------------------CLEANUP AND RESET FUNCTIONS
def arq_cleanup(self) -> None:
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"""
Cleanup function which clears all ARQ states
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"""
if TESTMODE:
self.log.debug("[TNC] TESTMODE: arq_cleanup: Not performing cleanup.")
return
self.log.debug("[TNC] arq_cleanup")
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self.session_id = bytes(1)
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self.rx_frame_bof_received = False
self.rx_frame_eof_received = False
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self.burst_ack = False
self.rpt_request_received = False
self.data_frame_ack_received = False
static.RX_BURST_BUFFER = []
static.RX_FRAME_BUFFER = b""
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self.burst_ack_snr = 255
# reset modem receiving state to reduce cpu load
modem.RECEIVE_DATAC1 = False
modem.RECEIVE_DATAC3 = False
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# modem.RECEIVE_FSK_LDPC_0 = False
modem.RECEIVE_FSK_LDPC_1 = False
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# 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_received_counter = 0
self.speed_level = len(self.mode_list) - 1
static.ARQ_SPEED_LEVEL = self.speed_level
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# low bandwidth mode indicator
self.received_LOW_BANDWIDTH_MODE = False
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# reset retry counter for rx channel / burst
self.n_retries_per_burst = 0
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if not static.ARQ_SESSION:
static.TNC_STATE = "IDLE"
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static.ARQ_STATE = False
self.arq_file_transfer = False
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static.BEACON_PAUSE = False
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def arq_reset_ack(self, state: bool) -> None:
"""
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Funktion for resetting acknowledge states
Args:
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state:bool:
"""
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self.burst_ack = state
self.rpt_request_received = state
self.data_frame_ack_received = state
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def set_listening_modes(self, mode: int) -> None:
"""
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Function for setting the data modes we are listening to for saving cpu power
Args:
mode:int: Codec2 mode to listen for
"""
# set modes we want to listen to
if mode == FREEDV_MODE.datac1.value:
modem.RECEIVE_DATAC1 = True
self.log.debug("[TNC] Changing listening data mode", mode="datac1")
elif mode == FREEDV_MODE.datac3.value:
modem.RECEIVE_DATAC3 = True
self.log.debug("[TNC] Changing listening data mode", mode="datac3")
elif mode == FREEDV_MODE.fsk_ldpc_1.value:
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"
)
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# ------------------------- WATCHDOG FUNCTIONS FOR TIMER
def watchdog(self) -> None:
"""Author: DJ2LS
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Watchdog master function. From here, "pet" the watchdogs
"""
while True:
time.sleep(0.1)
self.data_channel_keep_alive_watchdog()
self.burst_watchdog()
self.arq_session_keep_alive_watchdog()
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def burst_watchdog(self) -> None:
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"""
Watchdog which checks if we are running into a connection timeout
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DATA BURST
"""
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# IRS SIDE
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# 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 (
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not static.ARQ_STATE
and static.ARQ_SESSION_STATE != "connected"
or not self.is_IRS
):
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return
# We want to reach this state only if connected ( == return above not called )
if (
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self.data_channel_last_received + self.time_list[self.speed_level]
<= time.time()
):
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,
)
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
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# Update modes we are listening to
self.set_listening_modes(self.mode_list[self.speed_level])
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# Why not pass `snr` or `static.SNR`?
self.send_burst_nack_frame_watchdog(0)
# Update data_channel timestamp
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()
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def data_channel_keep_alive_watchdog(self) -> None:
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"""
watchdog which checks if we are running into a connection timeout
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DATA CHANNEL
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"""
# and not static.ARQ_SEND_KEEP_ALIVE:
if static.ARQ_STATE and static.TNC_STATE == "BUSY":
time.sleep(0.01)
if (
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self.data_channel_last_received + self.transmission_timeout
> time.time()
):
time.sleep(0.01)
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# 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")
+ "]"
)
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self.send_data_to_socket_queue(
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freedata="tnc-message",
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arq="transmission",
status="failed",
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uuid=self.transmission_uuid,
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)
self.arq_cleanup()
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def arq_session_keep_alive_watchdog(self) -> None:
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"""
watchdog which checks if we are running into a connection timeout
ARQ SESSION
"""
if (
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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():
time.sleep(0.01)
else:
self.log.info(
"[TNC] SESSION ["
+ str(self.mycallsign, "UTF-8")
+ "]<<T>>["
+ str(static.DXCALLSIGN, "UTF-8")
+ "]"
)
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self.send_data_to_socket_queue(
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freedata="tnc-message",
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arq="session",
status="failed",
reason="timeout",
)
self.close_session()
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def heartbeat(self) -> None:
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"""
Heartbeat thread which auto pauses and resumes the heartbeat signal when in an arq session
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"""
while True:
time.sleep(0.01)
if (
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static.ARQ_SESSION
and self.IS_ARQ_SESSION_MASTER
and static.ARQ_SESSION_STATE == "connected"
and not self.arq_file_transfer
):
time.sleep(1)
self.transmit_session_heartbeat()
time.sleep(2)
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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
)