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FreeDATA/data_handler.py
DJ2LS 1d5d50a868
reset frame machine correctly
2021-03-10 09:12:49 +01:00

743 lines
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Python
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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 trio
import static
import modem
modem = modem.RF()
import helpers
#############################################################################################################
# ARQ DATA HANDLER
#############################################################################################################
def arq_data_received(data_in):
static.TNC_STATE = 'BUSY'
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("----------------------------------------------------------------")
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) + "%] [BER."+str(static.BER)+"]" )
#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 = []
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_payload = b'ACK'
#ack_frame = b'<' + ack_payload # < = 60
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)
static.CHANNEL_STATE = 'RECEIVING_DATA'
#TRANSMIT_ARQ_ACK_THREAD = threading.Thread(target=modem.transmit_arq_ack, args=[ack_frame], name="TRANSMIT_ARQ_BURST")
#TRANSMIT_ARQ_ACK_THREAD.start()
#while static.ARQ_STATE == 'SENDING_ACK':
# pass
#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) + "] [BER."+str(static.BER)+"]")
#BUILDING RPT FRAME FOR BURST -----------------------------------------------
#rpt_payload = missing_frames
#rpt_frame = b'>' + rpt_payload #> = 63 --> 62?!?!?!?!
rpt_frame = bytearray(14)
rpt_frame[:1] = bytes([63])
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)
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 == True and static.ARQ_FRAME_EOF_RECEIVED == True:
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(complete_data_frame)
#BUILDING ACK FRAME FOR DATA FRAME -----------------------------------------------
#ack_payload = b'FRAME_ACK'
#ack_frame = b'='+ ack_payload + bytes(static.FRAME_CRC) # < = 61
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(1) #0.5
logging.info("ARQ | TX | ARQ DATA FRAME ACK [" + str(static.FRAME_CRC.hex()) +"] [BER."+str(static.BER)+"]")
modem.transmit_signalling(ack_frame)
static.CHANNEL_STATE = 'RECEIVING_SIGNALLING'
# clearing buffers and resetting counters
static.ARQ_RX_BURST_BUFFER = []
static.ARQ_RX_FRAME_BUFFER = []
static.ARQ_FRAME_BOF_RECEIVED = False
static.ARQ_FRAME_EOF_RECEIVED = False
static.ARQ_N_ARQ_FRAMES_PER_DATA_FRAME = 0
static.ARQ_RX_N_CURRENT_ARQ_FRAME = 0
static.TNC_STATE = 'IDLE'
static.ARQ_SEND_KEEP_ALIVE = True
static.ARQ_READY_FOR_DATA = False
logging.info("DATA ["+ str(static.MYCALLSIGN, 'utf-8') + "]<< >>["+ str(static.DXCALLSIGN, 'utf-8') + "] [BER."+str(static.BER)+"]")
else:
print("ARQ_FRAME_BOF_RECEIVED " + str(static.ARQ_FRAME_BOF_RECEIVED))
print("ARQ_FRAME_EOF_RECEIVED " + str(static.ARQ_FRAME_EOF_RECEIVED))
logging.error("ARQ | RX | DATA FRAME NOT SUCESSFULLY RECEIVED!")
static.ARQ_STATE = 'IDLE'
static.ARQ_SEND_KEEP_ALIVE = True
static.ARQ_READY_FOR_DATA = False
logging.info("DATA ["+ str(static.MYCALLSIGN, 'utf-8') + "]<< >>["+ str(static.DXCALLSIGN, 'utf-8') + "] [BER."+str(static.BER)+"]")
async 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 = 256-2
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:
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) + "] [BER."+str(static.BER)+"]")
# lets start a thread to transmit nonblocking
#TRANSMIT_ARQ_BURST_THREAD = threading.Thread(target=modem.transmit_arq_burst, name="TRANSMIT_ARQ_BURST")
#TRANSMIT_ARQ_BURST_THREAD.start()
#asyncio.run(modem.transmit_arq_burst())
await 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)
#print(static.ARQ_RX_ACK_TIMEOUT)
#print("timeout......?!?")
#asyncio.ensure_future(helpers.set_variable_after_timeout())
##################task = asyncio.create_task(helpers.set_after_timeout())
#async with trio.open_nursery() as nursery:
# nursery.start_soon(helpers.set_after_timeout())
#print("TIMEOUT glaube gestartet...")
#print(task)
#print(static.ARQ_RX_ACK_TIMEOUT)
acktimer = threading.Timer(static.ARQ_RX_ACK_TIMEOUT_SECONDS, helpers.arq_ack_timeout)
acktimer.start()
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(".............................")
# --------------------------- WHILE TIMEOUT NOT REACHED AND NO ACK RECEIVED --> LISTEN
while static.ARQ_ACK_RECEIVED != True and static.ARQ_RPT_RECEIVED != True and static.ARQ_FRAME_ACK_RECEIVED != True 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.ARQ_STATE)
if static.ARQ_RPT_RECEIVED == True:
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))
#TRANSMIT_ARQ_BURST_THREAD = threading.Thread(target=modem.transmit_arq_burst, name="TRANSMIT_ARQ_BURST")
#TRANSMIT_ARQ_BURST_THREAD.start()
#asyncio.run(modem.transmit_arq_burst())
await 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)
rpttimer = threading.Timer(static.ARQ_RX_RPT_TIMEOUT_SECONDS, helpers.arq_rpt_timeout)
rpttimer.start()
while static.ARQ_ACK_RECEIVED == False and static.ARQ_FRAME_ACK_RECEIVED == False and static.ARQ_RX_RPT_TIMEOUT == False:
time.sleep(0.01) # lets reduce CPU load a little bit
logging.debug(static.ARQ_STATE)
if static.ARQ_ACK_RECEIVED == True:
logging.info("ARQ | RX | ACK AFTER RPT")
rpttimer.cancel()
helpers.arq_reset_ack(True)
static.ARQ_RPT_FRAMES = []
if static.ARQ_RX_RPT_TIMEOUT == True and static.ARQ_ACK_RECEIVED == False:
logging.error("ARQ | Burst lost....")
helpers.arq_reset_ack(False)
static.ARQ_RPT_FRAMES = []
#--------------------------------------------------------------------------------------------------------------
elif static.ARQ_ACK_RECEIVED == 0 and static.ARQ_RX_ACK_TIMEOUT == 1:
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 == True:
logging.info("ARQ | RX | ACK")
acktimer.cancel()
#-----------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
#--------------- BREAK LOOP IF FRAME ACK HAS BEEN RECEIVED EARLIER AS EXPECTED
elif static.ARQ_FRAME_ACK_RECEIVED == True:
logging.info("ARQ | RX | EARLY FRAME ACK RECEIVED")
#static.ARQ_N_SENT_FRAMES = #static.TX_BUFFER_SIZE
static.ARQ_N_SENT_FRAMES = static.ARQ_N_SENT_FRAMES + static.ARQ_TX_N_FRAMES_PER_BURST
break
else:
logging.debug("------------------------------->NO RULE MATCHED!")
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))
frametimer = threading.Timer(static.ARQ_RX_FRAME_TIMEOUT_SECONDS, helpers.arq_frame_timeout)
frametimer.start()
static.CHANNEL_STATE = 'RECEIVING_SIGNALLING'
# wait for frame ACK if we processed the last frame/burst
while static.ARQ_FRAME_ACK_RECEIVED == False and static.ARQ_RX_FRAME_TIMEOUT == False and static.ARQ_N_SENT_FRAMES == static.TX_BUFFER_SIZE:
time.sleep(0.01) # lets reduce CPU load a little bit
#print(static.ARQ_STATE)
logging.debug("WAITING FOR FRAME ACK")
# ----------- if no ACK received and out of retries.....stop frame sending
if static.ARQ_ACK_RECEIVED == False and static.ARQ_FRAME_ACK_RECEIVED == False and static.ARQ_RX_ACK_TIMEOUT == True:
logging.error("ARQ | TX | NO ACK RECEIVED | DATA SHOULD BE RESEND!")
static.CHANNEL_STATE = 'RECEIVING_SIGNALLING'
logging.error("------------------------------------------------------")
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 == True:
logging.log(25,"ARQ | RX | FRAME ACK RECEIVED - DATA TRANSMITTED! :-)")
static.CHANNEL_STATE = 'RECEIVING_SIGNALLING'
break
elif static.ARQ_FRAME_ACK_RECEIVED == False and static.ARQ_RX_FRAME_TIMEOUT == True:
logging.error("ARQ | TX | NO FRAME ACK RECEIVED")
static.CHANNEL_STATE = 'RECEIVING_DATA'
break
else:
logging.debug("NO MATCHING RULE AT THE END")
# stop all timers
try:
frametimer.cancel()
except Exception:
pass
try:
acktimer.cancel()
except Exception:
pass
# IF TX BUFFER IS EMPTY / ALL FRAMES HAVE BEEN SENT --> HERE WE COULD ADD AN static.VAR for IDLE STATE
logging.info("ARQ | TX | BUFFER EMPTY")
helpers.arq_reset_frame_machine()
await asyncio.sleep(2)
logging.info("DATA ["+ str(static.MYCALLSIGN, 'utf-8') + "]<< >>["+ str(static.DXCALLSIGN, 'utf-8') + "] [BER."+str(static.BER)+"]")
arq_transmit_keep_alive()
# 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 = 1
return n_frames_per_burst
def burst_ack_received():
static.ARQ_ACK_RECEIVED = True #Force data loops of TNC to stop and continue with next frame
def frame_ack_received():
static.ARQ_FRAME_ACK_RECEIVED = True #Force data loops of TNC to stop and continue with next frame
def burst_rpt_received(data_in):
static.ARQ_RPT_RECEIVED = True
static.ARQ_RPT_FRAMES = []
missing_area = bytes(data_in[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)
#############################################################################################################
# ARQ CONNECT HANDLER
#############################################################################################################
async def arq_connect():
static.ARQ_STATE = 'CONNECTING'
logging.info("CONN ["+ str(static.MYCALLSIGN, 'utf-8') + "]-> <-["+ str(static.DXCALLSIGN, 'utf-8') + "] [BER."+str(static.BER)+"]")
frame_type = bytes([220])
connection_frame = bytearray(14)
connection_frame[:1] = frame_type
connection_frame[1:2] = static.DXCALLSIGN_CRC8
connection_frame[2:3] = static.MYCALLSIGN_CRC8
connection_frame[3:9] = static.MYCALLSIGN # we need the full CALLSIGN, if we are doing a connect without ping and cq
#connection_frame[12:13] = bytes([static.ARQ_DATA_CHANNEL_MODE])
#connection_frame[13:14] = bytes([static.ARQ_READY_FOR_DATA])
#print(connection_frame)
modem.transmit_signalling(connection_frame)
def arq_received_connect(data_in):
static.ARQ_STATE = 'CONNECTING'
static.DXCALLSIGN = bytes(data_in[3:9]).rstrip(b'\x00')
static.DXCALLSIGN_CRC8 = helpers.get_crc_8(static.DXCALLSIGN)
#static.FREEDV_DATA_MODE = int.from_bytes(bytes(data_in[12:13]), "big")
logging.info("CONN ["+ str(static.MYCALLSIGN, 'utf-8') + "]-> <-["+ str(static.DXCALLSIGN, 'utf-8') + "] [BER."+str(static.BER)+"]")
frame_type = bytes([221])
connection_frame = bytearray(14)
connection_frame[:1] = frame_type
connection_frame[1:2] = static.DXCALLSIGN_CRC8
connection_frame[2:3] = static.MYCALLSIGN_CRC8
#connection_frame[12:13] = bytes([static.FREEDV_DATA_MODE])
#send ACK for connect
modem.transmit_signalling(connection_frame)
def arq_transmit_keep_alive():
frame_type = bytes([221])
connection_frame = bytearray(14)
connection_frame[:1] = frame_type
connection_frame[1:2] = static.DXCALLSIGN_CRC8
connection_frame[2:3] = static.MYCALLSIGN_CRC8
modem.transmit_signalling(connection_frame)
def arq_received_connect_keep_alive(data_in):
if static.ARQ_SEND_KEEP_ALIVE == True and (static.ARQ_STATE == 'CONNECTING' or static.ARQ_STATE == 'CONNECTED'):
logging.info("CONN ["+ str(static.MYCALLSIGN, 'utf-8') + "] >|< ["+ str(static.DXCALLSIGN, 'utf-8') + "] [BER."+str(static.BER)+"]")
static.ARQ_STATE = 'CONNECTED'
frame_type = bytes([221])
connection_frame = bytearray(14)
connection_frame[:1] = frame_type
connection_frame[1:2] = static.DXCALLSIGN_CRC8
connection_frame[2:3] = static.MYCALLSIGN_CRC8
connection_frame[12:13] = bytes([static.ARQ_DATA_CHANNEL_MODE])
connection_frame[13:14] = bytes([0])
#lets wait a second before sending
acktimer = threading.Timer(1.0, modem.transmit_signalling, args=[connection_frame])
acktimer.start()
else:
pass
#print("keep alive = False")
#############################################################################################################
# ARQ DATA CHANNEL HANDLER
#############################################################################################################
async def arq_open_data_channel():
# we need to wait until the last keep alive has been sent.
logging.info("DATA ["+ str(static.MYCALLSIGN, 'utf-8') + "]>> <<["+ str(static.DXCALLSIGN, 'utf-8') + "] [BER."+str(static.BER)+"]")
static.ARQ_SEND_KEEP_ALIVE = False
static.ARQ_DATA_CHANNEL_MODE = 12
while static.CHANNEL_STATE == 'SENDING_SIGNALLING':
time.sleep(0.01)
#print("wir warten 2 sekunden...")
await asyncio.sleep(4)
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[12:13] = bytes([static.ARQ_DATA_CHANNEL_MODE])
#connection_frame[13:14] = bytes([225])
while static.CHANNEL_STATE == 'SENDING_SIGNALLING':
time.sleep(0.01)
modem.transmit_signalling(connection_frame)
def arq_received_data_channel_opener(data_in):
logging.info("DATA ["+ str(static.MYCALLSIGN, 'utf-8') + "]>> <<["+ str(static.DXCALLSIGN, 'utf-8') + "] [BER."+str(static.BER)+"]")
static.ARQ_SEND_KEEP_ALIVE = False
static.ARQ_DATA_CHANNEL_MODE = int.from_bytes(bytes(data_in[12:13]), "big")
#static.ARQ_READY_FOR_DATA = int.from_bytes(bytes(data_in[13:14]), "big")
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[12:13] = bytes([static.ARQ_DATA_CHANNEL_MODE])
#connection_frame[13:14] = bytes([226])
while static.CHANNEL_STATE == 'SENDING_SIGNALLING':
time.sleep(0.01)
modem.transmit_signalling(connection_frame)
#print("waiting for data....")
static.CHANNEL_STATE = 'RECEIVING_DATA'
# einen timeout benötigen wir auch noch....
# und ab hier geht es dann in den "RECEIVING_DATA" mode....
def arq_received_channel_is_open(data_in):
static.ARQ_SEND_KEEP_ALIVE == False
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') + "] [BER."+str(static.BER)+"]")
time.sleep(1)
static.ARQ_READY_FOR_DATA = True
#static.CHANNEL_STATE = 'RECEIVING_DATA':
#############################################################################################################
# DISCONNECT HANDLER
#############################################################################################################
async def arq_disconnect():
# we need to create a "force ignore all" so we don't receive frames any more... Then we don't need a timer
static.ARQ_SEND_KEEP_ALIVE == False
static.ARQ_STATE = 'DISCONNECTING'
logging.info("DISC ["+ str(static.MYCALLSIGN, 'utf-8') + "] <-> ["+ str(static.DXCALLSIGN, 'utf-8') + "] [BER."+str(static.BER)+"]")
#frame_type = bytes([222])
#disconnection_frame = frame_type + static.MYCALLSIGN
disc_frame = bytearray(14)
disc_frame[:1] = bytes([222])
disc_frame[1:2] = static.DXCALLSIGN_CRC8
disc_frame[2:3] = static.MYCALLSIGN_CRC8
while static.CHANNEL_STATE == 'SENDING_SIGNALLING':
time.sleep(0.01)
await asyncio.sleep(4)
modem.transmit_signalling(disc_frame)
logging.info("DISC ["+ str(static.MYCALLSIGN, 'utf-8') + "]< X >["+ str(static.DXCALLSIGN, 'utf-8') + "] [BER."+str(static.BER)+"]")
static.ARQ_STATE = 'IDLE'
static.DXCALLSIGN = b''
static.DXCALLSIGN_CRC8 = b''
def arq_disconnect_received(data_in):
static.ARQ_STATE = 'DISCONNECTED'
logging.info("DISC ["+ str(static.MYCALLSIGN, 'utf-8') + "]< X >["+ str(static.DXCALLSIGN, 'utf-8') + "] [BER."+str(static.BER)+"]")
static.ARQ_STATE = 'DISCONNECTED'
static.TNC_STATE = 'IDLE'
static.DXCALLSIGN = b''
static.DXCALLSIGN_CRC8 = b''
#############################################################################################################
# PING HANDLER
#############################################################################################################
async def transmit_ping(callsign):
static.DXCALLSIGN = bytes(callsign, 'utf-8')
static.DXCALLSIGN_CRC8 = helpers.get_crc_8(static.DXCALLSIGN)
logging.info("PING ["+ str(static.MYCALLSIGN, 'utf-8') + "] >>> [" + str(static.DXCALLSIGN, 'utf-8') + "] [BER."+str(static.BER)+"]")
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....
while static.CHANNEL_STATE == 'SENDING_SIGNALLING':
time.sleep(0.01)
modem.transmit_signalling(ping_frame)
def received_ping(data_in):
static.DXCALLSIGN_CRC8 = bytes(data_in[2:3])
static.DXCALLSIGN = bytes(data_in[3:9])
logging.info("PING ["+ str(static.MYCALLSIGN, 'utf-8') + "] <<< ["+ str(static.DXCALLSIGN, 'utf-8') + "] [BER."+str(static.BER)+"]")
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.MYCALLSIGN
# wait while sending....
while static.CHANNEL_STATE == 'SENDING_SIGNALLING':
time.sleep(0.01)
modem.transmit_signalling(ping_frame)
def received_ping_ack(data_in):
static.DXCALLSIGN_CRC8 = bytes(data_in[2:3])
static.DXCALLSIGN = bytes(data_in[3:9])
logging.info("PING [" + str(static.DXCALLSIGN, 'utf-8') + "] >|< [" + str(static.MYCALLSIGN, 'utf-8') + "] [BER."+str(static.BER)+"]")
static.TNC_STATE = 'IDLE'
#############################################################################################################
# BROADCAST HANDLER
#############################################################################################################
async 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
for i in range(0,3):
modem.transmit_signalling(cq_frame)
while static.ARQ_STATE == 'SENDING_SIGNALLING':
time.sleep(0.1)
def received_cq(data_in):
static.DXCALLSIGN = b''
static.DXCALLSIGN_CRC8 = b''
logging.info("CQ [" + str(bytes(data_in[3:9]), 'utf-8') + "] [BER."+str(static.BER)+"]")
async def transmit_beacon():
logging.info("BEACON")
frame_type = bytes([230])
print(frame_type)
beacon_frame = frame_type + static.MYCALLSIGN
while static.TNC_STATE == 'BEACON':
await asyncio.sleep(60)
modem.transmit_signalling(beacon_frame)
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