Reading UBX Messages with pyubx2¶

Pyubx2 is an open-source Python library for parsing and generating UBX protocol messages. It can be used to read the UBX messages listed in Table 3 directly from the Port C serial stream, alongside the RTCM 3 MSM7 correction data sharing that same port.

Installation¶

Pyubx2 requires Python 3.10 or later. Install it together with pyserial, which provides the serial port interface:

pip install pyubx2 pyserial

Reading Messages from Port C¶

Identify the COM port assigned to Port C by the USB-to-UART driver (see Section 3.1) and connect at 115200 baud. UBXReader parses each frame from the incoming stream as it arrives:

from serial import Serial
from pyubx2 import UBXReader, NMEA_PROTOCOL, UBX_PROTOCOL

port = "COM5"
baud = 115200

with Serial(port, baud, timeout=3) as stream:
    ubr = UBXReader(stream, protfilter=UBX_PROTOCOL)
    for raw_data, parsed_data in ubr:
        if parsed_data is not None:
            print(parsed_data)

RTCM3 frames are still consumed from the stream to keep parsing in sync, but return parsed_data = None and are skipped by the check above