Test on device behind proxy

### Description

As far as I can see, there appears to be no support for devices running behind a proxy. See project nodes and assistant for how this is already handled if necessary.

### Epic/Story

_No response_

No files or tests are named. Start by examining the referenced project nodes and assistant to find how proxy handling is already implemented, then trace the corresponding device connection entry point in this repository. Done means the expected behavior for devices behind a proxy is defined and covered by an appropriate test.

Written by the indexing model from the issue text.