FreeDATA/tnc/helpers.py

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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Created on Fri Dec 25 21:25:14 2020
@author: DJ2LS
"""
import time
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import crcengine
import static
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def wait(seconds):
"""
Args:
seconds:
Returns:
"""
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timeout = time.time() + seconds
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while time.time() < timeout:
time.sleep(0.01)
return True
def get_crc_8(data):
"""Author: DJ2LS
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Get the CRC8 of a byte string
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param: data = bytes()
Args:
data:
Returns:
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"""
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crc_algorithm = crcengine.new('crc8-ccitt') # load crc8 library
crc_data = crc_algorithm(data)
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crc_data = crc_data.to_bytes(1, byteorder='big')
return crc_data
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def get_crc_16(data):
"""Author: DJ2LS
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Get the CRC16 of a byte string
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param: data = bytes()
Args:
data:
Returns:
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"""
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crc_algorithm = crcengine.new('crc16-ccitt-false') # load crc16 library
crc_data = crc_algorithm(data)
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crc_data = crc_data.to_bytes(2, byteorder='big')
return crc_data
def get_crc_32(data):
"""Author: DJ2LS
Get the CRC32 of a byte string
param: data = bytes()
Args:
data:
Returns:
"""
crc_algorithm = crcengine.new('crc32') # load crc16 library
crc_data = crc_algorithm(data)
crc_data = crc_data.to_bytes(4, byteorder='big')
return crc_data
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def add_to_heard_stations(dxcallsign, dxgrid, datatype, snr, offset, frequency):
"""
Args:
dxcallsign:
dxgrid:
datatype:
snr:
offset:
frequency:
Returns:
"""
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# check if buffer empty
if len(static.HEARD_STATIONS) == 0:
static.HEARD_STATIONS.append([dxcallsign, dxgrid, int(time.time()), datatype, snr, offset, frequency])
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# if not, we search and update
else:
for i in range(0, len(static.HEARD_STATIONS)):
# update callsign with new timestamp
if static.HEARD_STATIONS[i].count(dxcallsign) > 0:
static.HEARD_STATIONS[i] = [dxcallsign, dxgrid, int(time.time()), datatype, snr, offset, frequency]
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break
# insert if nothing found
if i == len(static.HEARD_STATIONS) - 1:
static.HEARD_STATIONS.append([dxcallsign, dxgrid, int(time.time()), datatype, snr, offset, frequency])
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break
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# for idx, item in enumerate(static.HEARD_STATIONS):
# if dxcallsign in item:
# item = [dxcallsign, int(time.time())]
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# static.HEARD_STATIONS[idx] = item
def callsign_to_bytes(callsign):
"""
Args:
callsign:
Returns:
"""
# http://www.aprs.org/aprs11/SSIDs.txt
#-0 Your primary station usually fixed and message capable
#-1 generic additional station, digi, mobile, wx, etc
#-2 generic additional station, digi, mobile, wx, etc
#-3 generic additional station, digi, mobile, wx, etc
#-4 generic additional station, digi, mobile, wx, etc
#-5 Other networks (Dstar, Iphones, Androids, Blackberry's etc)
#-6 Special activity, Satellite ops, camping or 6 meters, etc
#-7 walkie talkies, HT's or other human portable
#-8 boats, sailboats, RV's or second main mobile
#-9 Primary Mobile (usually message capable)
#-10 internet, Igates, echolink, winlink, AVRS, APRN, etc
#-11 balloons, aircraft, spacecraft, etc
#-12 APRStt, DTMF, RFID, devices, one-way trackers*, etc
#-13 Weather stations
#-14 Truckers or generally full time drivers
#-15 generic additional station, digi, mobile, wx, etc
# try converting to bytestring if possible type string
try:
callsign = bytes(callsign, 'utf-8')
except:
pass
# we need to do this step to reduce the needed paypload by the callsign ( stripping "-" out of the callsign )
callsign = callsign.split(b'-')
try:
ssid = int(callsign[1])
except:
ssid = 0
callsign = callsign[0]
bytestring = bytearray(8)
bytestring[:len(callsign)] = callsign
bytestring[7:8] = bytes([ssid])
return bytes(bytestring)
def bytes_to_callsign(bytestring):
"""
Args:
bytestring:
Returns:
"""
# http://www.aprs.org/aprs11/SSIDs.txt
#-0 Your primary station usually fixed and message capable
#-1 generic additional station, digi, mobile, wx, etc
#-2 generic additional station, digi, mobile, wx, etc
#-3 generic additional station, digi, mobile, wx, etc
#-4 generic additional station, digi, mobile, wx, etc
#-5 Other networks (Dstar, Iphones, Androids, Blackberry's etc)
#-6 Special activity, Satellite ops, camping or 6 meters, etc
#-7 walkie talkies, HT's or other human portable
#-8 boats, sailboats, RV's or second main mobile
#-9 Primary Mobile (usually message capable)
#-10 internet, Igates, echolink, winlink, AVRS, APRN, etc
#-11 balloons, aircraft, spacecraft, etc
#-12 APRStt, DTMF, RFID, devices, one-way trackers*, etc
#-13 Weather stations
#-14 Truckers or generally full time drivers
#-15 generic additional station, digi, mobile, wx, etc
# we need to do this step to reduce the needed paypload by the callsign ( stripping "-" out of the callsign )
callsign = bytes(bytestring[:7])
callsign = callsign.rstrip(b'\x00')
ssid = int.from_bytes(bytes(bytestring[7:8]), "big")
callsign = callsign + b'-'
callsign = callsign.decode('utf-8')
callsign = callsign + str(ssid)
callsign = callsign.encode('utf-8')
return bytes(callsign)
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def check_callsign(callsign:bytes, crc_to_check:bytes):
"""
Funktion to check a crc against a callsign to calculate the ssid by generating crc until we got it
Args:
callsign: Callsign which we want to check
crc_to_check: The CRC which we want the callsign to check against
Returns:
[True, Callsign + SSID]
False
"""
crc_algorithm = crcengine.new('crc16-ccitt-false') # load crc16 library
try:
callsign = callsign.split(b'-')
callsign = callsign[0] # we want the callsign without SSID
except:
callsign = callsign
for ssid in static.SSID_LIST:
call_with_ssid = bytearray(callsign)
call_with_ssid.extend('-'.encode('utf-8'))
call_with_ssid.extend(str(ssid).encode('utf-8'))
callsign_crc = get_crc_16(call_with_ssid)
if callsign_crc == crc_to_check:
print(call_with_ssid)
return [True, bytes(call_with_ssid)]
return False