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

# Version 0.16.4

> April 27, 2026

## <u>Bug Fixes</u>

* **`/instruments/list` returning empty from worker threads** — when the box's HTTP server handled `/instruments/list` on a `ThreadingHTTPServer` worker, the USB scan's `signal.SIGALRM`-based timeout raised "signal only works in main thread of the main interpreter". The error was silently swallowed and the endpoint returned `[]`, so connected devices (e.g. LabJack T7) appeared to be missing. The scanner now falls back to a no-timeout direct call when it isn't on the main thread; the underlying serial and sysfs reads already have their own I/O timeouts. The CLI path was not affected because it runs `query_instruments.py` as a subprocess.

## <u>Installation</u>

To install this version:

```bash theme={null}
pip install lager-cli==0.16.4
```

To upgrade from a previous version:

```bash theme={null}
pip install --upgrade lager-cli
```

## Resources

[View Release on PyPI](https://pypi.org/project/lager-cli/0.16.4/)