There's a bunch of scripts and tools that allow to communicate with u-blox GPS receivers. However, I was unable to find scripts or tools that simulate the GPS receiver side. This Python script simulates the GPS receiver serial communication using UBX message protocol over Universal Asynchronous Receiver/Transmitter (UART). The idea is to replace the GPS receiver hardware by running this script - e.g. for testing code indoors before using it with real hardware.
The simulator is planned to implement the proprietary (but with an accessible specification document) u-blox 6 GPS receiver UBX message protocol. It may also apply for other u-blox GPS receivers - if you know more, let us know.
Its functionality is currently limited to:
- receiving all messages and evaluating their checksums,
- decoding and dumping decoded messages on the console,
- recognizing
CFGclass messages (0x06) and replying with anACK-ACK.
Disclaimer: The code has a lot of hacks, feel free to improve it and make a pull request! Please also understand that this software will never cover all functions of the real GPS receiver hardware - and there are likely some bugs in the code (search for FIXME and TODO)!
usage: ubx_gps_simulator.py [-h] [-b SERIAL_BAUDRATE] [-t IO_TARGET]
serial_port_name
ubx_gps_simulator.py Run simulated UBX GPX receiver.
positional arguments:
serial_port_name Serial port name
optional arguments:
-h, --help show this help message and exit
-b SERIAL_BAUDRATE, --serial-baudrate SERIAL_BAUDRATE
Serial baudrate with which the simulator is accessed
initially (default: 9600, possible: 4800, 9600, 19200,
38400, 57600, 115200)
-t IO_TARGET, --io-target IO_TARGET
I/O target ID (default: 1, possible: 1, 2)
See OpenBikeSensor Usage.
- SparkFun's Saleae Logic 2 High Level Analyzer (HLA) for u-blox UBX protocol on github