pyixblue

Python parser for the iXblue stdbin output protocol (versions 2 through 5).

stdbin is the binary navigation output of iXblue inertial systems. This package reassembles and decodes those frames. It does not open a socket or a serial port; pass in the bytes you receive over UDP, TCP, or serial.

The block layout and checksum follow the MIT-licensed ixblue_stdbin_decoder.

Install

pip install .

From a checkout, with the development tests:

uv sync

Usage

from pyixblue import StdBinDecoder

decoder = StdBinDecoder()
decoder.add_new_data(chunk)  # bytes-like; a chunk may be a partial frame
while decoder.parse_next_frame():  # False when more bytes are needed
    header = decoder.last_header
    if header.message_type == "nav":
        nav = decoder.last_nav  # missing blocks are None
        if nav.position is not None:
            print(nav.position.latitude_deg, nav.position.longitude_deg)
    else:
        payload = decoder.last_answer

parse_next_frame raises StdBinError when a frame is recognized but its protocol version or checksum is invalid. The decoder drops the bad version byte, or the whole frame after a bad checksum, so the next call can resync.

Navigation, extended-navigation, and external-sensor blocks are present only when their mask bit is set. INS algorithm and system status words are IntFlag values (1 << bit), so they compare equal to the raw integer:

from pyixblue.models import InsAlgorithmStatus1

if nav.ins_algorithm_status is not None:
    status = nav.ins_algorithm_status.status1
    if InsAlgorithmStatus1.NAVIGATION in status:
        print(hex(status))

Protocol

Supported output frames:

Multi-byte fields are big-endian. The checksum is the low 32 bits of the sum of every preceding byte, stored as a big-endian uint32.

Version 3 adds the extended-navigation mask. Versions 4 and 5 add the navigation-data size. The header also keeps the frame counter, which the reference C++ header discards.

License

MIT. Sample frames under tests/fixtures/ were converted from the ixblue_stdbin_decoder test logs (MIT, Copyright (c) 2019 iXblue SAS).