> ## Documentation Index
> Fetch the complete documentation index at: https://motorbridge.seeedstudio.com/llms.txt
> Use this file to discover all available pages before exploring further.

# MotorBridge 0.4.2 Release Test Note

<Note>Source: `CHANGELOG.md`</Note>

# MotorBridge 0.4.2 Release Test Note

Date: 2026-06-03

## Summary

Optimizes Damiao `dm-serial` background polling and tightens serial read
timeouts.

## Version Alignment

| Component             | Version  |
| --------------------- | -------- |
| Git release tag       | `v0.4.2` |
| Rust workspace crates | `0.4.2`  |
| Python package        | `0.4.2`  |
| C++ package metadata  | `0.4.2`  |

## Key Changes

### Fixed

* Optimized Damiao `dm-serial` background polling so `recv(0ms)` performs a
  true non-blocking drain instead of waiting on the serial-port read timeout
  when no bytes are pending.
* Reduced the Damiao serial bridge read timeout from 2 ms to 1 ms for bounded
  synchronous feedback/register reads while keeping compatibility fallbacks.

## See Also

* [Changelog](/source/repository/changelog)