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Auto-reconnect to Trimble GNSS provider after TMM restart

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
52/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Active
Tech stack
android, ios
Domain
mobile

Research direction

The issue names no files, tests, or entry points. Start by tracing the Trimble GNSS provider lifecycle around TMM disconnect and restart on Android and iOS, then reproduce the listed force-close and restart sequence. Done means the Mergin Maps app automatically restores the provider connection without an app restart or manual provider switch.

Written by the indexing model from the issue text.

Description

enhancement GPS

Description

When a user is connected to a Trimble GNSS device via Trimble Mobile Manager (TMM) in the Mergin Maps app and TMM crashes, the MM app correctly shows the position provider as disconnected. However, after restarting TMM, the connection is not automatically restored — the user must either restart the MM app or manually switch position providers to re-establish the GNSS connection.

Environment
[ ] Staging [ ] PROD

Application (+ app version, build, operating system)
Mergin Maps Mobile App

  • Android: 2026.3.2 / Samsung Galaxy A53 5G, Android 16
  • iOS: 2026.3.2 / iOS 26.0

Steps to reproduce

  1. Connect to a Trimble GNSS device via TMM in the MM app
  2. Verify the position provider is active and connected
  3. Force-close or crash TMM
  4. Observe the MM app shows the position provider as disconnected
  5. Restart TMM
  6. Observe the MM app — connection is not restored

Actual results
After TMM restarts, the MM app remains in a disconnected state. The user must restart the MM app or manually change the position provider to restore the GNSS connection.

Expected results
After TMM restarts and becomes available again, the MM app should automatically reconnect to the Trimble GNSS provider without requiring user intervention.

Screenshots or logs
(to be added)

Conclusion
Created by Claude and supervised by a human test analyst.

Dominant language
C++
Stars
388
Forks
87
Avg merge
2d 9h
Merged PRs (30d)
15

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  4. Open a pull request that references the issue number.

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