jt808protocol.py

hexString = ""
hexString = hexString[2:-2]
hexString = hexString.replace("7d01", "7d")
hexString = hexString.replace("7d02", "7e")

payload = bytearray.fromhex(hexString)

msg_type = payload[0:2]
msg_attr = payload[2:4]
device_id = payload[4:10]
msg_id = payload[10:12]
alarm_status = payload[12:16]
status = payload[16:20]
lat = payload[20:24]
lon = payload[24:28]
height = payload[28:30]
speed = payload[30:32]
direction = payload[32:34]
time = payload[34:40]

index = 40
while(index != len(payload)-1):
    key = payload[index]
    length = payload[index+1]
    data = payload[index+2:index+2+length]
    if key == 0x01:
        print("里程:{}".format(int.from_bytes(data, byteorder='big', signed=False)))
    if key == 0xCC:
        print("IMEI:{}".format(data.decode("utf-8")))
    if key == 0x30:
        print("RSSI:{}".format(int.from_bytes(data, byteorder='big', signed=False)))
    if key == 0x9F:
        print("基地台:{}".format(data.decode("utf-8").split(',')))
    if key == 0x81:
        print("RPM:{}".format(int.from_bytes(data, byteorder='big', signed=False)))
    if key == 0x82:
        print("Battery:{}".format(0.1*int.from_bytes(data, byteorder='big', signed=False)))
    if key == 0x83:
        print("engineLoad:{}%".format(int.from_bytes(data, byteorder='big', signed=False)))
    if key == 0x84:
        print("waterTemp:{}".format(-40+int.from_bytes(data, byteorder='big', signed=False)))
    if key == 0x8B:
        print("VIN:{}".format(data.decode("utf-8")))
    if key == 0x8C:
        print("ODO:{}km".format(0.1*int.from_bytes(data, byteorder='big', signed=False)))
    if key == 0xA0:
        print("故障:{}".format(data.decode("utf-8")))
    index = index + length + 2