mirror of
https://github.com/DJ2LS/FreeDATA
synced 2024-05-14 08:04:33 +00:00
252 lines
6.5 KiB
Python
252 lines
6.5 KiB
Python
#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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"""
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Created on Fri Dec 25 21:25:14 2020
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@author: DJ2LS
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"""
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import time
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import crcengine
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import static
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def wait(seconds):
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"""
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Args:
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seconds:
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Returns:
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"""
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timeout = time.time() + seconds
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while time.time() < timeout:
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time.sleep(0.01)
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return True
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def get_crc_8(data):
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"""Author: DJ2LS
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Get the CRC8 of a byte string
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param: data = bytes()
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Args:
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data:
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Returns:
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"""
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crc_algorithm = crcengine.new('crc8-ccitt') # load crc8 library
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crc_data = crc_algorithm(data)
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crc_data = crc_data.to_bytes(1, byteorder='big')
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return crc_data
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def get_crc_16(data):
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"""Author: DJ2LS
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Get the CRC16 of a byte string
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param: data = bytes()
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Args:
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data:
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Returns:
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"""
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crc_algorithm = crcengine.new('crc16-ccitt-false') # load crc16 library
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crc_data = crc_algorithm(data)
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crc_data = crc_data.to_bytes(2, byteorder='big')
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return crc_data
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def get_crc_32(data):
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"""Author: DJ2LS
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Get the CRC32 of a byte string
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param: data = bytes()
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Args:
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data:
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Returns:
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"""
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crc_algorithm = crcengine.new('crc32') # load crc16 library
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crc_data = crc_algorithm(data)
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crc_data = crc_data.to_bytes(4, byteorder='big')
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return crc_data
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def add_to_heard_stations(dxcallsign, dxgrid, datatype, snr, offset, frequency):
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"""
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Args:
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dxcallsign:
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dxgrid:
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datatype:
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snr:
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offset:
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frequency:
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Returns:
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"""
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# check if buffer empty
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if len(static.HEARD_STATIONS) == 0:
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static.HEARD_STATIONS.append([dxcallsign, dxgrid, int(time.time()), datatype, snr, offset, frequency])
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# if not, we search and update
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else:
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for i in range(0, len(static.HEARD_STATIONS)):
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# update callsign with new timestamp
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if static.HEARD_STATIONS[i].count(dxcallsign) > 0:
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static.HEARD_STATIONS[i] = [dxcallsign, dxgrid, int(time.time()), datatype, snr, offset, frequency]
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break
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# insert if nothing found
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if i == len(static.HEARD_STATIONS) - 1:
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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):
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# if dxcallsign in item:
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# item = [dxcallsign, int(time.time())]
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# static.HEARD_STATIONS[idx] = item
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def callsign_to_bytes(callsign):
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"""
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Args:
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callsign:
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Returns:
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"""
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# http://www.aprs.org/aprs11/SSIDs.txt
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#-0 Your primary station usually fixed and message capable
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#-1 generic additional station, digi, mobile, wx, etc
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#-2 generic additional station, digi, mobile, wx, etc
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#-3 generic additional station, digi, mobile, wx, etc
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#-4 generic additional station, digi, mobile, wx, etc
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#-5 Other networks (Dstar, Iphones, Androids, Blackberry's etc)
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#-6 Special activity, Satellite ops, camping or 6 meters, etc
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#-7 walkie talkies, HT's or other human portable
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#-8 boats, sailboats, RV's or second main mobile
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#-9 Primary Mobile (usually message capable)
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#-10 internet, Igates, echolink, winlink, AVRS, APRN, etc
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#-11 balloons, aircraft, spacecraft, etc
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#-12 APRStt, DTMF, RFID, devices, one-way trackers*, etc
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#-13 Weather stations
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#-14 Truckers or generally full time drivers
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#-15 generic additional station, digi, mobile, wx, etc
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# try converting to bytestring if possible type string
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try:
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callsign = bytes(callsign, 'utf-8')
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except:
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pass
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# we need to do this step to reduce the needed paypload by the callsign ( stripping "-" out of the callsign )
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callsign = callsign.split(b'-')
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try:
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ssid = int(callsign[1])
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except:
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ssid = 0
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callsign = callsign[0]
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bytestring = bytearray(8)
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bytestring[:len(callsign)] = callsign
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bytestring[7:8] = bytes([ssid])
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return bytes(bytestring)
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def bytes_to_callsign(bytestring):
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"""
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Args:
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bytestring:
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Returns:
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"""
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# http://www.aprs.org/aprs11/SSIDs.txt
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#-0 Your primary station usually fixed and message capable
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#-1 generic additional station, digi, mobile, wx, etc
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#-2 generic additional station, digi, mobile, wx, etc
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#-3 generic additional station, digi, mobile, wx, etc
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#-4 generic additional station, digi, mobile, wx, etc
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#-5 Other networks (Dstar, Iphones, Androids, Blackberry's etc)
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#-6 Special activity, Satellite ops, camping or 6 meters, etc
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#-7 walkie talkies, HT's or other human portable
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#-8 boats, sailboats, RV's or second main mobile
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#-9 Primary Mobile (usually message capable)
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#-10 internet, Igates, echolink, winlink, AVRS, APRN, etc
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#-11 balloons, aircraft, spacecraft, etc
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#-12 APRStt, DTMF, RFID, devices, one-way trackers*, etc
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#-13 Weather stations
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#-14 Truckers or generally full time drivers
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#-15 generic additional station, digi, mobile, wx, etc
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# we need to do this step to reduce the needed paypload by the callsign ( stripping "-" out of the callsign )
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callsign = bytes(bytestring[:7])
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callsign = callsign.rstrip(b'\x00')
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ssid = int.from_bytes(bytes(bytestring[7:8]), "big")
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callsign = callsign + b'-'
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callsign = callsign.decode('utf-8')
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callsign = callsign + str(ssid)
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callsign = callsign.encode('utf-8')
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return bytes(callsign)
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def check_callsign(callsign:bytes, crc_to_check:bytes):
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"""
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Funktion to check a crc against a callsign to calculate the ssid by generating crc until we got it
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Args:
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callsign: Callsign which we want to check
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crc_to_check: The CRC which we want the callsign to check against
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Returns:
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[True, Callsign + SSID]
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False
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"""
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crc_algorithm = crcengine.new('crc16-ccitt-false') # load crc16 library
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try:
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callsign = callsign.split(b'-')
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callsign = callsign[0] # we want the callsign without SSID
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except:
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callsign = callsign
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for ssid in static.SSID_LIST:
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call_with_ssid = bytearray(callsign)
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call_with_ssid.extend('-'.encode('utf-8'))
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call_with_ssid.extend(str(ssid).encode('utf-8'))
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callsign_crc = get_crc_16(call_with_ssid)
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if callsign_crc == crc_to_check:
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print(call_with_ssid)
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return [True, bytes(call_with_ssid)]
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return False
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