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FreeDATA/tnc/data_handler.py
DJ2LS efc6bc8ea5
small improvements
2021-09-08 18:04:21 +02:00

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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Created on Sun Dec 27 20:43:40 2020
@author: DJ2LS
"""
import logging
import threading
import time
from random import randrange
import asyncio
import sys
import static
import modem
import helpers
modem = modem.RF()
# ############################################################################################################
# ARQ DATA HANDLER
# ############################################################################################################
def arq_data_received(data_in):
# define some frame sizes so we can calculate the baud rate e.g.
if static.ARQ_DATA_CHANNEL_MODE == 10:
payload_per_frame = 512 - 2
elif static.ARQ_DATA_CHANNEL_MODE == 11:
payload_per_frame = 258 - 2
elif static.ARQ_DATA_CHANNEL_MODE == 12:
payload_per_frame = 128 - 2
elif static.ARQ_DATA_CHANNEL_MODE == 14:
payload_per_frame = 16 - 2
else:
payload_per_frame = 16 - 2
static.ARQ_PAYLOAD_PER_FRAME = payload_per_frame - 8
#
static.TNC_STATE = 'BUSY'
static.ARQ_DATA_CHANNEL_LAST_RECEIVED = int(time.time())
static.ARQ_N_FRAME = int.from_bytes(bytes(data_in[:1]), "big") - 10 # get number of burst frame
static.ARQ_N_RX_FRAMES_PER_BURSTS = int.from_bytes(bytes(data_in[1:2]), "big") # get number of bursts from received frame
static.ARQ_RX_N_CURRENT_ARQ_FRAME = int.from_bytes(bytes(data_in[2:4]), "big") # get current number of total frames
static.ARQ_N_ARQ_FRAMES_PER_DATA_FRAME = int.from_bytes(bytes(data_in[4:6]), "big") # get get total number of frames
logging.debug("----------------------------------------------------------------")
logging.debug("ARQ_N_FRAME: " + str(static.ARQ_N_FRAME))
logging.debug("ARQ_N_RX_FRAMES_PER_BURSTS: " + str(static.ARQ_N_RX_FRAMES_PER_BURSTS))
logging.debug("ARQ_RX_N_CURRENT_ARQ_FRAME: " + str(static.ARQ_RX_N_CURRENT_ARQ_FRAME))
logging.debug("ARQ_N_ARQ_FRAMES_PER_DATA_FRAME: " + str(static.ARQ_N_ARQ_FRAMES_PER_DATA_FRAME))
logging.debug("----------------------------------------------------------------")
helpers.calculate_transfer_rate()
arq_percent_burst = int((static.ARQ_N_FRAME / static.ARQ_N_RX_FRAMES_PER_BURSTS) * 100)
arq_percent_frame = int(((static.ARQ_RX_N_CURRENT_ARQ_FRAME) / static.ARQ_N_ARQ_FRAMES_PER_DATA_FRAME) * 100)
logging.log(24, "ARQ | RX | " + str(static.ARQ_DATA_CHANNEL_MODE) + " | F:[" + str(static.ARQ_N_FRAME) + "/" + str(static.ARQ_N_RX_FRAMES_PER_BURSTS) + "] [" + str(arq_percent_burst).zfill(3) + "%] T:[" + str(static.ARQ_RX_N_CURRENT_ARQ_FRAME) + "/" + str(static.ARQ_N_ARQ_FRAMES_PER_DATA_FRAME) + "] [" + str(arq_percent_frame).zfill(3) + "%] [SNR:" + str(static.SNR) + "]")
# allocate ARQ_RX_FRAME_BUFFER as a list with "None" if not already done. This should be done only once per burst!
# here we will save the N frame of a data frame to N list position so we can explicit search for it
# delete frame buffer if first frame to make sure the buffer is cleared and no junks of a old frame is remaining
if static.ARQ_RX_N_CURRENT_ARQ_FRAME == 1:
static.ARQ_RX_FRAME_BUFFER = []
try:
static.ARQ_RX_FRAME_BUFFER[static.ARQ_RX_N_CURRENT_ARQ_FRAME] = bytes(data_in)
except IndexError:
static.ARQ_RX_FRAME_BUFFER = []
#on a new transmission we reset the timer
static.ARQ_START_OF_TRANSMISSION = int(time.time()) + 4
for i in range(0, static.ARQ_N_ARQ_FRAMES_PER_DATA_FRAME + 1):
static.ARQ_RX_FRAME_BUFFER.insert(i, None)
static.ARQ_RX_FRAME_BUFFER[static.ARQ_RX_N_CURRENT_ARQ_FRAME] = bytes(data_in)
static.ARQ_FRAME_BOF_RECEIVED = False
static.ARQ_FRAME_EOF_RECEIVED = False
try:
static.ARQ_RX_BURST_BUFFER[static.ARQ_N_FRAME] = bytes(data_in)
except IndexError:
static.ARQ_RX_BURST_BUFFER = []
for i in range(0, static.ARQ_N_RX_FRAMES_PER_BURSTS + 1):
static.ARQ_RX_BURST_BUFFER.insert(i, None)
static.ARQ_RX_BURST_BUFFER[static.ARQ_N_FRAME] = bytes(data_in)
# - ------------------------- ARQ BURST CHECKER
# run only if we recieved all ARQ FRAMES per ARQ BURST
if static.ARQ_RX_BURST_BUFFER.count(None) == 1: # count nones
logging.info("ARQ | TX | BURST ACK")
# BUILDING ACK FRAME FOR BURST -----------------------------------------------
ack_frame = bytearray(14)
ack_frame[:1] = bytes([60])
ack_frame[1:2] = static.DXCALLSIGN_CRC8
ack_frame[2:3] = static.MYCALLSIGN_CRC8
# TRANSMIT ACK FRAME FOR BURST-----------------------------------------------
modem.transmit_signalling(ack_frame, 1)
while static.CHANNEL_STATE == 'SENDING_SIGNALLING':
time.sleep(0.01)
static.CHANNEL_STATE = 'RECEIVING_DATA'
# clear burst buffer
static.ARQ_RX_BURST_BUFFER = []
# if decoded N frames are unequal to expected frames per burst
elif static.ARQ_N_FRAME == static.ARQ_N_RX_FRAMES_PER_BURSTS and static.ARQ_RX_BURST_BUFFER.count(None) != 1:
# --------------- CHECK WHICH BURST FRAMES WE ARE MISSING -------------------------------------------
missing_frames = b''
for burstnumber in range(1, len(static.ARQ_RX_BURST_BUFFER)):
if static.ARQ_RX_BURST_BUFFER[burstnumber] == None:
# frame_number = static.ARQ_RX_N_CURRENT_ARQ_FRAME - static.ARQ_N_RX_FRAMES_PER_BURSTS + burstnumber
# logging.debug("frame_number" + str(frame_number))
logging.debug("static.ARQ_RX_N_CURRENT_ARQ_FRAME" + str(static.ARQ_RX_N_CURRENT_ARQ_FRAME))
logging.debug("ARQ_N_RX_FRAMES_PER_BURSTS" + str(static.ARQ_N_RX_FRAMES_PER_BURSTS))
frame_number = burstnumber
frame_number = frame_number.to_bytes(2, byteorder='big')
missing_frames += frame_number
logging.warning("ARQ | TX | RPT ARQ FRAMES [" + str(missing_frames) + "] [SNR:" + str(static.SNR) + "]")
# BUILDING RPT FRAME FOR BURST -----------------------------------------------
rpt_frame = bytearray(14)
rpt_frame[:1] = bytes([62])
rpt_frame[1:2] = static.DXCALLSIGN_CRC8
rpt_frame[2:3] = static.MYCALLSIGN_CRC8
rpt_frame[3:9] = missing_frames
# TRANSMIT RPT FRAME FOR BURST-----------------------------------------------
modem.transmit_signalling(rpt_frame, 1)
while static.CHANNEL_STATE == 'SENDING_SIGNALLING':
time.sleep(0.01)
static.CHANNEL_STATE = 'RECEIVING_DATA'
# ---------------------------- FRAME MACHINE
# --------------- IF LIST NOT CONTAINS "None" stick everything together
complete_data_frame = bytearray()
# print("static.ARQ_RX_FRAME_BUFFER.count(None)" + str(static.ARQ_RX_FRAME_BUFFER.count(None)))
if static.ARQ_RX_FRAME_BUFFER.count(None) == 1: # 1 because position 0 of list will alaways be None in our case
logging.debug("DECODING FRAME!")
for frame in range(1, len(static.ARQ_RX_FRAME_BUFFER)):
raw_arq_frame = static.ARQ_RX_FRAME_BUFFER[frame]
arq_frame_payload = raw_arq_frame[8:]
# -------- DETECT IF WE RECEIVED A FRAME HEADER THEN SAVE DATA TO GLOBALS
if arq_frame_payload[2:4].startswith(static.FRAME_BOF):
static.FRAME_CRC = arq_frame_payload[:2]
static.ARQ_FRAME_BOF_RECEIVED = True
arq_frame_payload = arq_frame_payload.split(static.FRAME_BOF)
arq_frame_payload = arq_frame_payload[1]
logging.debug("BOF")
# -------- DETECT IF WE RECEIVED A FRAME FOOTER THEN SAVE DATA TO GLOBALS
# we need to check for at least one xFF. Sometimes we have only one xFF, because the second one is in the next frame
if arq_frame_payload.rstrip(b'\x00').endswith(static.FRAME_EOF) or arq_frame_payload.rstrip(b'\x00').endswith(static.FRAME_EOF[:-1]):
static.ARQ_FRAME_EOF_RECEIVED = True
if arq_frame_payload.rstrip(b'\x00').endswith(static.FRAME_EOF[:-1]):
arq_frame_payload = arq_frame_payload.split(static.FRAME_EOF[:-1])
arq_frame_payload = arq_frame_payload[0]
else:
arq_frame_payload = arq_frame_payload.split(static.FRAME_EOF)
arq_frame_payload = arq_frame_payload[0]
logging.debug("EOF")
# --------- AFTER WE SEPARATED BOF AND EOF, STICK EVERYTHING TOGETHER
complete_data_frame = complete_data_frame + arq_frame_payload
logging.debug(complete_data_frame)
# check if Begin of Frame BOF and End of Frame EOF are received, then start calculating CRC and sticking everything together
if static.ARQ_FRAME_BOF_RECEIVED and static.ARQ_FRAME_EOF_RECEIVED:
frame_payload_crc = helpers.get_crc_16(complete_data_frame)
# IF THE FRAME PAYLOAD CRC IS EQUAL TO THE FRAME CRC WHICH IS KNOWN FROM THE HEADER --> SUCCESS
if frame_payload_crc == static.FRAME_CRC:
logging.log(25, "ARQ | RX | DATA FRAME SUCESSFULLY RECEIVED! :-) ")
# append received frame to RX_BUFFER
###static.RX_BUFFER.append({"DXCALL" : static.DXCALLSIGN ,"DATA" : complete_data_frame.decode("utf-8")})
###static.RX_BUFFER.append([static.DXCALLSIGN,static.DXGRID,int(time.time()), complete_data_frame.decode("utf-8")])
static.RX_BUFFER.append([static.DXCALLSIGN,static.DXGRID,int(time.time()), complete_data_frame.decode("utf-8")])
# BUILDING ACK FRAME FOR DATA FRAME -----------------------------------------------
ack_frame = bytearray(14)
ack_frame[:1] = bytes([61])
ack_frame[1:2] = static.DXCALLSIGN_CRC8
ack_frame[2:3] = static.MYCALLSIGN_CRC8
# TRANSMIT ACK FRAME FOR BURST-----------------------------------------------
#time.sleep(0.5) # 0.5
logging.info("ARQ | TX | ARQ DATA FRAME ACK [" + str(static.FRAME_CRC.hex()) + "] [SNR:" + str(static.SNR) + "]")
helpers.wait(1)
modem.transmit_signalling(ack_frame, 1)
while static.CHANNEL_STATE == 'SENDING_SIGNALLING':
time.sleep(0.01)
helpers.arq_reset_frame_machine()
logging.info("DATA [" + str(static.MYCALLSIGN, 'utf-8') + "]<< >>[" + str(static.DXCALLSIGN, 'utf-8') + "] [SNR:" + str(static.SNR) + "]")
else:
print("ARQ_FRAME_BOF_RECEIVED " + str(static.ARQ_FRAME_BOF_RECEIVED))
print("ARQ_FRAME_EOF_RECEIVED " + str(static.ARQ_FRAME_EOF_RECEIVED))
print(static.ARQ_RX_FRAME_BUFFER)
logging.error("ARQ | RX | DATA FRAME NOT SUCESSFULLY RECEIVED!")
# BUILDING ACK FRAME FOR DATA FRAME -----------------------------------------------
nak_frame = bytearray(14)
nak_frame[:1] = bytes([63])
nak_frame[1:2] = static.DXCALLSIGN_CRC8
nak_frame[2:3] = static.MYCALLSIGN_CRC8
# TRANSMIT ACK FRAME FOR BURST-----------------------------------------------
#time.sleep(0.5) # 0.5
logging.info("ARQ | TX | NAK")
modem.transmit_signalling(nak_frame, 1)
while static.CHANNEL_STATE == 'SENDING_SIGNALLING':
time.sleep(0.01)
helpers.arq_reset_frame_machine()
logging.info("DATA [" + str(static.MYCALLSIGN, 'utf-8') + "]<<X>>[" + str(static.DXCALLSIGN, 'utf-8') + "] [SNR:" + str(static.SNR) + "]")
def arq_transmit(data_out):
# we need to set payload per frame manually at this point. maybe we can do this more dynmic.
if static.ARQ_DATA_CHANNEL_MODE == 10:
payload_per_frame = 512 - 2
elif static.ARQ_DATA_CHANNEL_MODE == 11:
payload_per_frame = 258 - 2
elif static.ARQ_DATA_CHANNEL_MODE == 12:
payload_per_frame = 128 - 2
elif static.ARQ_DATA_CHANNEL_MODE == 14:
payload_per_frame = 16 - 2
else:
payload_per_frame = 16 - 2
static.ARQ_PAYLOAD_PER_FRAME = payload_per_frame - 8
# print("static.ARQ_DATA_PAYLOAD_PER_FRAME " + str(static.FREEDV_DATA_PAYLOAD_PER_FRAME))
# print("static.ARQ_PAYLOAD_PER_FRAME " + str(static.ARQ_PAYLOAD_PER_FRAME))
frame_header_length = 6 # 4
n_arq_frames_per_data_frame = (len(data_out) + frame_header_length) // static.ARQ_PAYLOAD_PER_FRAME + ((len(data_out) + frame_header_length) % static.ARQ_PAYLOAD_PER_FRAME > 0)
frame_payload_crc = helpers.get_crc_16(data_out)
# This is the total frame with frame header, which will be send
data_out = frame_payload_crc + static.FRAME_BOF + data_out + static.FRAME_EOF
# 2 2 N 2
# --------------------------------------------- LETS CREATE A BUFFER BY SPLITTING THE FILES INTO PEACES
static.TX_BUFFER = [data_out[i:i + static.ARQ_PAYLOAD_PER_FRAME] for i in range(0, len(data_out), static.ARQ_PAYLOAD_PER_FRAME)]
static.TX_BUFFER_SIZE = len(static.TX_BUFFER)
logging.info("ARQ | TX | M:" + str(static.ARQ_DATA_CHANNEL_MODE) + " | DATA FRAME --- BYTES: " + str(len(data_out)) + " ARQ FRAMES: " + str(static.TX_BUFFER_SIZE))
# --------------------------------------------- THIS IS THE MAIN LOOP-----------------------------------------------------------------
static.ARQ_N_SENT_FRAMES = 0 # SET N SENT FRAMES TO 0 FOR A NEW SENDING CYCLE
while static.ARQ_N_SENT_FRAMES <= static.TX_BUFFER_SIZE:
#static.ARQ_TX_N_FRAMES_PER_BURST = get_n_frames_per_burst()
# ----------- CREATE FRAME TOTAL PAYLOAD TO BE ABLE TO CREATE CRC FOR IT
try: # DETECT IF LAST BURST TO PREVENT INDEX ERROR OF BUFFER
for i in range(static.ARQ_TX_N_FRAMES_PER_BURST): # Loop through TX_BUFFER LIST
len(static.TX_BUFFER[static.ARQ_N_SENT_FRAMES + i]) # we calculate the length to trigger a list index error
except IndexError: # IF LAST BURST DETECTED BUILD CRC WITH LESS FRAMES AND SET static.ARQ_TX_N_FRAMES_PER_BURST TO VALUE OF REST!
if static.ARQ_N_SENT_FRAMES == 0 and (static.ARQ_TX_N_FRAMES_PER_BURST > static.TX_BUFFER_SIZE): # WE CANT DO MODULO 0 --> CHECK IF FIRST FRAME == LAST FRAME
static.ARQ_TX_N_FRAMES_PER_BURST = static.TX_BUFFER_SIZE
elif static.ARQ_N_SENT_FRAMES == 1 and (static.ARQ_TX_N_FRAMES_PER_BURST > static.TX_BUFFER_SIZE): # MODULO 1 WILL ALWAYS BE 0 --> THIS FIXES IT
static.ARQ_TX_N_FRAMES_PER_BURST = static.TX_BUFFER_SIZE - static.ARQ_N_SENT_FRAMES
else:
static.ARQ_TX_N_FRAMES_PER_BURST = (static.TX_BUFFER_SIZE % static.ARQ_N_SENT_FRAMES)
# --------------------------------------------- N ATTEMPTS TO SEND BURSTS IF ACK RECEPTION FAILS
for static.TX_N_RETRIES in range(static.TX_N_MAX_RETRIES):
if static.ARQ_N_SENT_FRAMES + 1 <= static.TX_BUFFER_SIZE:
helpers.calculate_transfer_rate()
logging.log(24, "ARQ | TX | M:" + str(static.ARQ_DATA_CHANNEL_MODE) + " | F:[" + str(static.ARQ_N_SENT_FRAMES + 1) + "-" + str(static.ARQ_N_SENT_FRAMES + static.ARQ_TX_N_FRAMES_PER_BURST) + "] | T:[" + str(static.ARQ_N_SENT_FRAMES) + "/" + str(static.TX_BUFFER_SIZE) + "] [" + str(int(static.ARQ_N_SENT_FRAMES / (static.TX_BUFFER_SIZE) * 100)).zfill(3) + "%] | A:[" + str(static.TX_N_RETRIES + 1) + "/" + str(static.TX_N_MAX_RETRIES) + "]")
# lets refresh all timers and ack states before sending a new frame
helpers.arq_reset_ack(False)
helpers.arq_reset_timeout(False)
modem.transmit_arq_burst()
# lets wait during sending. After sending is finished we will continue
while static.CHANNEL_STATE == 'SENDING_DATA':
time.sleep(0.01)
# --------------------------- START TIMER FOR WAITING FOR ACK ---> IF TIMEOUT REACHED, ACK_TIMEOUT = 1
logging.debug("ARQ | RX | WAITING FOR BURST ACK")
static.CHANNEL_STATE = 'RECEIVING_SIGNALLING'
#helpers.arq_reset_timeout(False)
#helpers.arq_reset_ack(False)
logging.debug(".............................")
logging.debug("static.ARQ_STATE " + str(static.ARQ_STATE))
logging.debug("static.ARQ_FRAME_ACK_RECEIVED " + str(static.ARQ_FRAME_ACK_RECEIVED))
logging.debug("static.ARQ_ACK_RECEIVED " + str(static.ARQ_ACK_RECEIVED))
logging.debug("static.ARQ_RX_ACK_TIMEOUT " + str(static.ARQ_RX_ACK_TIMEOUT))
logging.debug("static.ARQ_RPT_RECEIVED " + str(static.ARQ_RPT_RECEIVED))
logging.debug(".............................")
burstacktimeout = time.time() + static.ARQ_RX_ACK_TIMEOUT_SECONDS
# --------------------------- WHILE TIMEOUT NOT REACHED AND NO ACK RECEIVED --> LISTEN
while not static.ARQ_ACK_RECEIVED and not static.ARQ_RPT_RECEIVED and not static.ARQ_FRAME_ACK_RECEIVED and time.time() < burstacktimeout:# and static.ARQ_RX_FRAME_TIMEOUT != True and static.ARQ_RX_ACK_TIMEOUT != True:
time.sleep(0.01) # lets reduce CPU load a little bit
logging.debug(static.CHANNEL_STATE)
if static.ARQ_RPT_RECEIVED:
logging.warning("ARQ | RX | REQUEST FOR REPEATING FRAMES: " + str(static.ARQ_RPT_FRAMES))
logging.warning("ARQ | TX | SENDING REQUESTED FRAMES: " + str(static.ARQ_RPT_FRAMES))
modem.transmit_arq_burst()
# lets wait during sending. After sending is finished we will continue
while static.ARQ_STATE == 'SENDING_DATA':
time.sleep(0.01)
static.CHANNEL_STATE = 'RECEIVING_SIGNALLING'
helpers.arq_reset_timeout(False)
helpers.arq_reset_ack(False)
rpttimeout = time.time() + static.ARQ_RX_RPT_TIMEOUT_SECONDS
while not static.ARQ_ACK_RECEIVED and not static.ARQ_FRAME_ACK_RECEIVED and time.time() < rpttimeout: #static.ARQ_RX_RPT_TIMEOUT == False:
time.sleep(0.01) # lets reduce CPU load a little bit
#logging.info(static.ARQ_STATE)
if static.ARQ_ACK_RECEIVED:
logging.info("ARQ | RX | ACK AFTER RPT")
helpers.arq_reset_ack(True)
static.ARQ_RPT_FRAMES = []
static.ARQ_N_SENT_FRAMES = static.ARQ_N_SENT_FRAMES + static.ARQ_TX_N_FRAMES_PER_BURST
if static.ARQ_RX_RPT_TIMEOUT and not static.ARQ_ACK_RECEIVED:
logging.error("ARQ | Burst lost....")
helpers.arq_reset_ack(False)
static.ARQ_RPT_FRAMES = []
#break
# the order of ACK check is important! speciall the FRAME ACK after RPT needs to be checked really early!
# --------------- BREAK LOOP IF FRAME ACK HAS BEEN RECEIVED EARLIER AS EXPECTED
elif static.ARQ_FRAME_ACK_RECEIVED:
logging.info("ARQ | RX | EARLY FRAME ACK RECEIVED #2")
static.ARQ_N_SENT_FRAMES = static.ARQ_N_SENT_FRAMES + static.ARQ_TX_N_FRAMES_PER_BURST
break
# --------------------------------------------------------------------------------------------------------------
elif not static.ARQ_ACK_RECEIVED: # and static.ARQ_RX_ACK_TIMEOUT == True:
logging.warning("ARQ | RX | ACK TIMEOUT!")
pass # no break here so we can continue with the next try of repeating the burst
# --------------- BREAK LOOP IF ACK HAS BEEN RECEIVED
elif static.ARQ_ACK_RECEIVED:
transfer_rates = helpers.calculate_transfer_rate()
logging.info("ARQ | RX | ACK [" + str(transfer_rates[2]) + " bit/s | " + str(transfer_rates[3]) + " B/min]")
# -----------IF ACK RECEIVED, INCREMENT ITERATOR FOR MAIN LOOP TO PROCEED WITH NEXT FRAMES/BURST
static.ARQ_N_SENT_FRAMES = static.ARQ_N_SENT_FRAMES + static.ARQ_TX_N_FRAMES_PER_BURST
break
else:
logging.info("------------------------------->NO RULE MATCHED!")
print("ARQ_ACK_RECEIVED " + str(static.ARQ_ACK_RECEIVED))
print("ARQ_RX_ACK_TIMEOUT " + str(static.ARQ_RX_ACK_TIMEOUT))
break
# --------------------------------WAITING AREA FOR FRAME ACKs
logging.debug("static.ARQ_N_SENT_FRAMES " + str(static.ARQ_N_SENT_FRAMES))
logging.debug("static.TX_BUFFER_SIZE " + str(static.TX_BUFFER_SIZE))
logging.debug("static.TX_N_RETRIES " + str(static.TX_N_RETRIES))
logging.debug("static.TX_N_MAX_RETRIES " + str(static.TX_N_MAX_RETRIES))
logging.debug("static.ARQ_STATE " + str(static.ARQ_STATE))
logging.debug("static.ARQ_FRAME_ACK_RECEIVED " + str(static.ARQ_FRAME_ACK_RECEIVED))
logging.debug("static.ARQ_RX_FRAME_TIMEOUT " + str(static.ARQ_RX_FRAME_TIMEOUT))
logging.debug("static.ARQ_ACK_RECEIVED " + str(static.ARQ_ACK_RECEIVED))
logging.debug("static.ARQ_RX_ACK_TIMEOUT " + str(static.ARQ_RX_ACK_TIMEOUT))
logging.debug("static.ARQ_RPT_RECEIVED " + str(static.ARQ_RPT_RECEIVED))
logging.debug("static.ARQ_TX_N_FRAMES_PER_BURST " + str(static.ARQ_TX_N_FRAMES_PER_BURST))
static.CHANNEL_STATE = 'RECEIVING_SIGNALLING'
frameacktimeout = time.time() + static.ARQ_RX_FRAME_TIMEOUT_SECONDS
# wait for frame ACK if we processed the last frame/burst
while not static.ARQ_FRAME_ACK_RECEIVED and time.time() < frameacktimeout and static.ARQ_N_SENT_FRAMES == static.TX_BUFFER_SIZE:
time.sleep(0.01) # lets reduce CPU load a little bit
logging.debug("WAITING FOR FRAME ACK")
# ----------- if no ACK received and out of retries.....stop frame sending
if not static.ARQ_ACK_RECEIVED and not static.ARQ_FRAME_ACK_RECEIVED: # and static.ARQ_RX_ACK_TIMEOUT == True:
logging.error("ARQ | TX | NO ACK RECEIVED | DATA SHOULD BE RESEND!")
break
# -------------------------BREAK TX BUFFER LOOP IF ALL PACKETS HAVE BEEN SENT AND WE GOT A FRAME ACK
elif static.ARQ_N_SENT_FRAMES == static.TX_BUFFER_SIZE and static.ARQ_FRAME_ACK_RECEIVED:
logging.log(25, "ARQ | RX | FRAME ACK! - DATA TRANSMITTED! :-)")
break
elif not static.ARQ_FRAME_ACK_RECEIVED and time.time() > frameacktimeout: # == False and static.ARQ_RX_FRAME_TIMEOUT == True:
logging.error("ARQ | TX | NO FRAME ACK RECEIVED")
break
else:
logging.debug("NO MATCHING RULE AT THE END")
# IF TX BUFFER IS EMPTY / ALL FRAMES HAVE BEEN SENT --> HERE WE COULD ADD AN static.VAR for IDLE STATE
#transfer_rates = helpers.calculate_transfer_rate()
#logging.info("RATE (DATA/ACK) :[" + str(transfer_rates[0]) + " bit/s | " + str(transfer_rates[1]) + " B/min]")
logging.info("ARQ | TX | BUFFER EMPTY")
helpers.arq_reset_frame_machine()
# await asyncio.sleep(2)
#time.sleep(2)
logging.info("DATA [" + str(static.MYCALLSIGN, 'utf-8') + "]<< >>[" + str(static.DXCALLSIGN, 'utf-8') + "] [SNR:" + str(static.SNR) + "]")
# this should close our thread so we are saving memory...
# https://stackoverflow.com/questions/905189/why-does-sys-exit-not-exit-when-called-inside-a-thread-in-python
sys.exit()
# BURST MACHINE TO DEFINE N BURSTS PER FRAME ---> LATER WE CAN USE CHANNEL MESSUREMENT TO SET FRAMES PER BURST
def get_n_frames_per_burst():
#n_frames_per_burst = randrange(1,10)
n_frames_per_burst = 2
return n_frames_per_burst
def get_best_mode_for_transmission():
mode = 14
return mode
def burst_ack_received():
static.ARQ_ACK_RECEIVED = True # Force data loops of TNC to stop and continue with next frame
static.ARQ_DATA_CHANNEL_LAST_RECEIVED = int(time.time()) # we need to update our timeout timestamp
def frame_ack_received():
static.ARQ_FRAME_ACK_RECEIVED = True # Force data loops of TNC to stop and continue with next frame
static.ARQ_DATA_CHANNEL_LAST_RECEIVED = int(time.time()) # we need to update our timeout timestamp
def burst_rpt_received(data_in):
static.ARQ_RPT_RECEIVED = True
static.ARQ_DATA_CHANNEL_LAST_RECEIVED = int(time.time()) # we need to update our timeout timestamp
static.ARQ_RPT_FRAMES = []
missing_area = bytes(data_in[3:12]) # 1:9
for i in range(0, 6, 2):
if not missing_area[i:i + 2].endswith(b'\x00\x00'):
missing = missing_area[i:i + 2]
static.ARQ_RPT_FRAMES.insert(0, missing)
def frame_nack_received():
print("NAK RECEIVED :-/")
# ############################################################################################################
# ARQ DATA CHANNEL HANDLER
# ############################################################################################################
def open_dc_and_transmit(data_out, mode, n_frames):
if not static.ARQ_READY_FOR_DATA:
# we open the datachannel with the mode, selected from GUI
if n_frames != 0:
static.ARQ_TX_N_FRAMES_PER_BURST = n_frames
# else we do an auto selection --> future feature: path calculation
else:
static.ARQ_TX_N_FRAMES_PER_BURST = get_n_frames_per_burst()
asyncio.run(arq_open_data_channel(mode))
# wait until data channel is open
while not static.ARQ_READY_FOR_DATA:
time.sleep(0.01)
#on a new transmission we reset the timer
static.ARQ_START_OF_TRANSMISSION = int(time.time())
# lets wait a little bit so RX station is ready for receiving
wait_before_data_timer = time.time() + 0.5
while time.time() < wait_before_data_timer:
pass
# lets wait a little bit
#time.sleep(5)
# transmit data
arq_transmit(data_out)
async def arq_open_data_channel(mode):
if mode == 0:
static.ARQ_DATA_CHANNEL_MODE = get_best_mode_for_transmission()
print(static.ARQ_DATA_CHANNEL_MODE)
else:
static.ARQ_DATA_CHANNEL_MODE = int(mode)
static.ARQ_DATA_CHANNEL_LAST_RECEIVED = int(time.time())
while static.CHANNEL_STATE == 'SENDING_SIGNALLING':
time.sleep(0.01)
connection_frame = bytearray(14)
connection_frame[:1] = bytes([225])
connection_frame[1:2] = static.DXCALLSIGN_CRC8
connection_frame[2:3] = static.MYCALLSIGN_CRC8
connection_frame[3:9] = static.MYCALLSIGN
connection_frame[12:13] = bytes([static.ARQ_DATA_CHANNEL_MODE])
while not static.ARQ_READY_FOR_DATA:
for attempt in range(0,static.ARQ_OPEN_DATA_CHANNEL_RETRIES):
logging.info("DATA [" + str(static.MYCALLSIGN, 'utf-8') + "]>> <<[" + str(static.DXCALLSIGN, 'utf-8') + "] A:[" + str(attempt + 1) + "/" + str(static.ARQ_OPEN_DATA_CHANNEL_RETRIES) + "]")
modem.transmit_signalling(connection_frame, 1)
while static.CHANNEL_STATE == 'SENDING_SIGNALLING':
time.sleep(0.01)
timeout = time.time() + 5
while time.time() < timeout:
# break if data channel is openend
if static.ARQ_READY_FOR_DATA:
break
if static.ARQ_READY_FOR_DATA:
break
if not static.ARQ_READY_FOR_DATA and attempt + 1 == static.ARQ_OPEN_DATA_CHANNEL_RETRIES:
logging.info("DATA [" + str(static.MYCALLSIGN, 'utf-8') + "]>>X<<[" + str(static.DXCALLSIGN, 'utf-8') + "]")
helpers.arq_reset_frame_machine()
sys.exit()
def arq_received_data_channel_opener(data_in):
static.DXCALLSIGN_CRC8 = bytes(data_in[2:3]).rstrip(b'\x00')
static.DXCALLSIGN = bytes(data_in[3:9]).rstrip(b'\x00')
helpers.add_to_heard_stations(static.DXCALLSIGN,static.DXGRID, 'DATA-CHANNEL', static.SNR)
logging.info("DATA [" + str(static.MYCALLSIGN, 'utf-8') + "]>> <<[" + str(static.DXCALLSIGN, 'utf-8') + "] [SNR:" + str(static.SNR) + "]")
static.ARQ_STATE = 'DATA'
static.TNC_STATE = 'BUSY'
static.ARQ_DATA_CHANNEL_MODE = int.from_bytes(bytes(data_in[12:13]), "big")
static.ARQ_DATA_CHANNEL_LAST_RECEIVED = int(time.time())
connection_frame = bytearray(14)
connection_frame[:1] = bytes([226])
connection_frame[1:2] = static.DXCALLSIGN_CRC8
connection_frame[2:3] = static.MYCALLSIGN_CRC8
connection_frame[3:9] = static.MYCALLSIGN
connection_frame[12:13] = bytes([static.ARQ_DATA_CHANNEL_MODE])
modem.transmit_signalling(connection_frame, 2)
while static.CHANNEL_STATE == 'SENDING_SIGNALLING':
time.sleep(0.01)
logging.info("DATA [" + str(static.MYCALLSIGN, 'utf-8') + "]>>|<<[" + str(static.DXCALLSIGN, 'utf-8') + "] [SNR:" + str(static.SNR) + "]")
wait_until_receive_data = time.time() + 1
while time.time() < wait_until_receive_data:
pass
static.CHANNEL_STATE = 'RECEIVING_DATA'
# and now we are going to "RECEIVING_DATA" mode....
def arq_received_channel_is_open(data_in):
static.DXCALLSIGN_CRC8 = bytes(data_in[2:3]).rstrip(b'\x00')
static.DXCALLSIGN = bytes(data_in[3:9]).rstrip(b'\x00')
helpers.add_to_heard_stations(static.DXCALLSIGN,static.DXGRID, 'DATA-CHANNEL', static.SNR)
static.ARQ_DATA_CHANNEL_LAST_RECEIVED = int(time.time())
if static.ARQ_DATA_CHANNEL_MODE == int.from_bytes(bytes(data_in[12:13]), "big"):
logging.info("DATA [" + str(static.MYCALLSIGN, 'utf-8') + "]>>|<<[" + str(static.DXCALLSIGN, 'utf-8') + "] [SNR:" + str(static.SNR) + "]")
helpers.wait(1)
static.ARQ_STATE = 'DATA'
static.ARQ_READY_FOR_DATA = True
static.ARQ_DATA_CHANNEL_LAST_RECEIVED = int(time.time())
else:
print("wrong mode received...")
# ############################################################################################################
# PING HANDLER
# ############################################################################################################
#async def transmit_ping(callsign):
def transmit_ping(callsign):
static.DXCALLSIGN = bytes(callsign, 'utf-8').rstrip(b'\x00')
static.DXCALLSIGN_CRC8 = helpers.get_crc_8(static.DXCALLSIGN)
logging.info("PING [" + str(static.MYCALLSIGN, 'utf-8') + "] >>> [" + str(static.DXCALLSIGN, 'utf-8') + "] [SNR:" + str(static.SNR) + "]")
ping_frame = bytearray(14)
ping_frame[:1] = bytes([210])
ping_frame[1:2] = static.DXCALLSIGN_CRC8
ping_frame[2:3] = static.MYCALLSIGN_CRC8
ping_frame[3:9] = static.MYCALLSIGN
# wait while sending....
modem.transmit_signalling(ping_frame, 1)
while static.CHANNEL_STATE == 'SENDING_SIGNALLING':
time.sleep(0.01)
def received_ping(data_in):
static.DXCALLSIGN_CRC8 = bytes(data_in[2:3]).rstrip(b'\x00')
static.DXCALLSIGN = bytes(data_in[3:9]).rstrip(b'\x00')
helpers.add_to_heard_stations(static.DXCALLSIGN,static.DXGRID, 'PING', static.SNR)
logging.info("PING [" + str(static.MYCALLSIGN, 'utf-8') + "] <<< [" + str(static.DXCALLSIGN, 'utf-8') + "] [SNR:" + str(static.SNR) + "]")
ping_frame = bytearray(14)
ping_frame[:1] = bytes([211])
ping_frame[1:2] = static.DXCALLSIGN_CRC8
ping_frame[2:3] = static.MYCALLSIGN_CRC8
ping_frame[3:9] = static.MYGRID
# wait while sending....
modem.transmit_signalling(ping_frame, 1)
while static.CHANNEL_STATE == 'SENDING_SIGNALLING':
time.sleep(0.01)
def received_ping_ack(data_in):
static.DXCALLSIGN_CRC8 = bytes(data_in[2:3]).rstrip(b'\x00')
static.DXGRID = bytes(data_in[3:9]).rstrip(b'\x00')
helpers.add_to_heard_stations(static.DXCALLSIGN,static.DXGRID, 'PING-ACK', static.SNR)
logging.info("PING [" + str(static.MYCALLSIGN, 'utf-8') + "] >|< [" + str(static.DXCALLSIGN, 'utf-8') + "]["+ str(static.DXGRID, 'utf-8') +"] [SNR:" + str(static.SNR) + "]")
static.TNC_STATE = 'IDLE'
# ############################################################################################################
# BROADCAST HANDLER
# ############################################################################################################
#async def transmit_cq():
def transmit_cq():
logging.info("CQ CQ CQ")
cq_frame = bytearray(14)
cq_frame[:1] = bytes([200])
cq_frame[1:2] = b'\x01'
#cq_frame[2:3] = static.MYCALLSIGN_CRC8
#cq_frame[3:9] = static.MYCALLSIGN
cq_frame[2:8] = static.MYCALLSIGN
cq_frame[8:14] = static.MYGRID
#print(cq_frame)
modem.transmit_signalling(cq_frame, 3)
#for i in range(0, 3):
#
# modem.transmit_signalling(cq_frame, 1)
# while static.CHANNEL_STATE == 'SENDING_SIGNALLING':
# time.sleep(0.01)
#
# time_between_cq = time.time() + 1
# while time.time() < time_between_cq:
# pass
def received_cq(data_in):
# here we add the received station to the heard stations buffer
dxcallsign = bytes(data_in[2:8]).rstrip(b'\x00')
dxgrid = bytes(data_in[8:14]).rstrip(b'\x00')
logging.info("CQ RCVD [" + str(dxcallsign, 'utf-8') + "]["+ str(dxgrid, 'utf-8') +"] [SNR" + str(static.SNR) + "]")
helpers.add_to_heard_stations(dxcallsign,dxgrid, 'CQ CQ CQ', static.SNR)
async def transmit_beacon():
logging.info("BEACON")
beacon_frame[:1] = bytes([230])
beacon_frame[1:2] = b'\x01'
beacon_frame[2:8] = static.MYCALLSIGN
beacon_frame[8:14] = static.MYGRID
while static.TNC_STATE == 'BEACON':
await asyncio.sleep(60)
modem.transmit_signalling(beacon_frame,1)
while static.CHANNEL_STATE == 'SENDING_SIGNALLING':
time.sleep(0.01)
def received_beacon():
# here we add the received station to the heard stations buffer
dxcallsign = bytes(data_in[2:8]).rstrip(b'\x00')
dxgrid = bytes(data_in[8:14]).rstrip(b'\x00')
logging.info("BEACON RCVD [" + str(dxcallsign, 'utf-8') + "]["+ str(dxgrid, 'utf-8') +"] [SNR" + str(static.SNR) + "]")
helpers.add_to_heard_stations(dxcallsign,dxgrid, 'BEACON', static.SNR)
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