How to decode binary data of the on-board GPS positioning terminal and obtain positioning information?

Cracking the binary data of the vehicle GPS positioning terminal to obtain real-time location information

This article will explore how to decode binary data received from the on-board GPS positioning terminal and extract key positioning information. My server-side receiving code is as follows, but the data cannot be parsed correctly at present:

 import socket

# Server IP and port SERVER_IP = '192.168.1.14'
SERVER_PORT = 12345

# Create TCP socket server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server_socket.bind((SERVER_IP, SERVER_PORT))
server_socket.listen(1)

print('Waiting for the on-board positioning terminal to connect...')

While True:
    client_socket, client_address = server_socket.accept()
    print('Car on-board positioning terminal is connected:', client_address)

    data = client_socket.recv(102400) # Receive data print('raw data:', data) # Print raw data for debugging# Data processing and decoding logic (it needs to be modified according to the actual protocol here)
    try:
        if data.startswith(b'~') and data.endswith(b'~'):
            payload = data[1:-1]
            # You need to add specific decoding logic here according to the device protocol document # For example: use structure analysis, bit operation and other methods to analyze information such as latitude and longitude, speed, time, etc. # ... Decoding logic...

            # Example: Assume that decoded_data = {
                "device_id": "123456",
                "latitude": 34.2678,
                "longitude": 108.9876,
                "speed": 60,
                "timestamp": "2024-10-27 10:30:00"
            }
            print("Decoded data:", decoded_data)
        else:
            print("Invalid packet")
    except Exception as e:
        print(f"Data decoding error: {e}")


    client_socket.close()

The examples of the data I received are as follows:

 <code>b'~\x01\x00\x00!\x01ea8f\x97\x00\x00\x00,\x01/70111kg-12a\x00\x000000000\x01\xd4\xc1b88888\xe5~'</code>

This looks like some kind of custom binary protocol that may contain encrypted information.

Key Challenges and Solutions:

1. Protocol Identification: First, it is necessary to determine the communication protocol used by the GPS positioning terminal. This usually requires consulting the device's documentation or contacting the device supplier to obtain the protocol specification. The protocol specification details the structure of the packet, the meaning of each byte or bit.

2. Packet parsing: Write code to parse data packets according to the protocol specification. This may involve:

   • Identification of packet header and tail: Determines the start and end marks of the packet (for example, ~ in this example).
   • Field extraction: According to the protocol specification, extract the values ​​of each field, such as device ID, latitude and longitude, timestamp, speed, etc.
   • Data type conversion: Convert binary data to the corresponding numerical type (for example, integers, floating point numbers).
   • Data decryption (if any): If the data is encrypted, it is necessary to use the correct decryption algorithm and key to decrypt according to the protocol specification.

3. Code improvement: The above code needs to add specific decoding logic at # ... 解码逻辑... , which relies entirely on specific protocol specifications. It is recommended to use structures or classes to represent the structure of data packets for easy organization and maintenance of code.

Summary: Decoding the on-board GPS positioning terminal data requires careful study of the communication protocol of the equipment. Without protocol specifications, effective decoding cannot be performed. It is recommended to contact the equipment supplier to obtain the protocol document, or try reverse engineering (if you have relevant technical capabilities) to analyze the structure of the data packet. Once the protocol is determined, the corresponding code can be written for data analysis and information extraction.

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