Concox GT800 / Wetrack800 GPS device data decoding - python-3.x

Question

I'm using twisted python tcp server
I encoded the byte string with
byte.hex()
data_1 = 78 78 11 01 0 XXXXXXXXXXXXXXX 80 00 21 21 00 00 38 54 0d0a
data_2 = 78 78 11 01 0 XXXXXXXXXXXXXXX 80 00 21 21 00 32 2a c5 0d0a
7878 -> Start bit
11 -> Packet length
01 -> Protocol Number
XX..XX -> IMEI
0d0a -> End bit
I find problem in decoding this part 8000212100322ac5 according to their documentation its a login packet and I should send some response to it.
For C# GPS Socket communication (CONCOX)
I'm in need of algorithm or a decoding method in python

Answer 1

For GT-800 this i think this will help you
class TcpGpsReceiver(protocol.Protocol):
""" Event driven callback handler
"""
def __init__(self):
"""Constructor
"""
self.imei_no = ''
def gt_800(self, decoded_data):
""" Decode the GT-800 Device Data
"""
if decoded_data[4:6].decode() == '11': # Check if login
print('Login')
self.imei_no = decoded_data[9:24]
data = codecs.decode('7878050100059FF80D0A', encoding='hex', errors='strict')
self.transport.write(data)
if decoded_data[4:6].decode().upper() == '0A':
print('Heat beat received')
serial_number = hex(int(decoded_data[18:22], 16))[2:]
data = codecs.decode('78780513{}670E0D0A'.format(get_serial_number(serial_number)),
encoding='hex', errors='strict')
print(decoded_data[18:22], ' -> serial number')
self.transport.write(data)
if decoded_data[4:6].decode() == '22':
print('Decoding')
s_no = hex(int(decoded_data[66:70], 16))[2:]
date_time = decoded_data[8:20]
latitude = int(decoded_data[23:30], 16) / 1800000
longitude = int(decoded_data[31:38], 16) / 1800000
timestamp = datetime(year=int(date_time[0:2], 16),
month=int(date_time[2:4], 16),
day=int(date_time[4:6], 16),
hour=int(date_time[6:8], 16),
minute=int(date_time[8:10], 16),
second=int(date_time[10:12], 16)).strftime('%Y-%m-%d %H:%M:%S')
location = dict(device_id=self.imei_no.decode(), imei=self.imei_no.decode(), timestamp=timestamp,
location=[latitude, longitude],
speed=0, course=0, state=0, altitude=0)
print(location)
# Code to access location data
self.imei_no = ''
self.transport.loseConnection()
if decoded_data[6:8].decode().upper() == '8A':
print('Date time requested')
s_no = hex(int(decoded_data[8:12], 16))[2:]
now = datetime.now()
month_hex = '0' + hex(now.month)[2:]
print(decoded_data[12:16], hex(int(decoded_data[12:16], 16))[2:])
date_string = '{}{}{}{}{}{}{}{}'.format(hex(int(str(now.year)[2:]))[2:], month_hex, return_date_hex(now.day),
return_date_hex(now.hour), return_date_hex(now.minute),
return_date_hex(now.second),
get_serial_number(s_no), get_serial_number(hex(int(decoded_data[12:16],
16))[2:]))
print(date_string)
data = codecs.decode('78780B8A{}0D0A'.format(date_string), encoding='hex', errors='strict')
self.transport.write(data)
def dataReceived(self, data):
""" Called when data is received across a transport
"""
decoded_data = codecs.encode(data, encoding='hex', errors='strict')
print(datetime.now())
self.gt_800(decoded_data)
def get_serial_number(s_no):
"""Decoding serial No
"""
if len(s_no) == 1:
return '000' + s_no
if len(s_no) == 2:
return '00' + s_no
if len(s_no) == 3:
return '0' + s_no
if len(s_no) > 4:
return '0000'
return s_no
def retrun_date_hex(data):
print(data)
if len(str(hex(data)[2:])) == 2:
return hex(data)[2:]
else:
return '0' + hex(data)[2:]
class TcpGpsReceiverFactory(protocol.Factory):
""" Persistent configuration information, inherits from protocol.Factory
"""
def buildProtocol(self, addr):
""" Creates a protocol for each new connection
"""
return TcpGpsReceiver()
if _name_ == '_main_':
# Called when the module ran directly
reactor.listenTCP(10206, TcpGpsReceiverFactory())
reactor.run()