Unable to reconnect to external GNSS receiver after switching to internal GPS

Description
Unable to reconnect to an external GNSS receiver (RX) once it has been disconnected. After connecting to the internal GPS, the app doesn't allow selecting the external receiver again without removing and re-pairing it.

Environment
Staging

Application (+ app version, build, operating system)

• Android app version: 2025.4.0
• Android version: Android 14

Steps to reproduce

1. Pair an external GNSS receiver (RX) with the device
2. Connect to the external receiver in the Mergin Maps app
3. Switch connection to Internal GPS
4. Try to reconnect to the external receiver (RX)

Actual results
Unable to select the external receiver again. The app doesn't allow reconnecting to the previously paired receiver.

Expected results
Should be able to switch back to the external receiver without needing to remove and re-pair it.

Screenshots or logs

Conclusion
Created by GitHub Copilot and supervised by a human test analyst.

Start by reproducing the receiver connection flow on Android 14 with app version 2025.4.0: connect an external GNSS receiver, switch to Internal GPS, and attempt to select the paired receiver again. The fix is complete when the previously paired external receiver can be selected and reconnected without removing or re-pairing it.