OperationMutex stuck with multiple (>3-6) connections

[9il]

The old devices support reason is clear. However, for our use case when we need to connect to and make discovery of 8 devices at the same time to make DFU this behavior is a blocker.

[philips77]

Would you be able to share some logs how does it stuck on the Mutex? Any more details? I'll try to replicate it locally.

[9il]

Hi, unfortunately I don't have the logs and to be honest I am not sure how it works exactly in our codebase.

The setup:

• 8 nrf54l15 devices are advertising
• the MVI intent in the same time do the following for each of 8 trackers:
• connects (and bonds), requests MTU=247, discover services, request image information over SMP, and may start the DFU.
• Also the devices asks the phone for smaller time interval possible
• Subscribing to sensor notifications (30fps)

We solved it with mutex + kable by connecting only one peripheral at time and it seems to work.

However, with or without mutex Kotlin-BLE-Library is stuck after connecting only 3 devices.

On the other hand I am not sure that it isn't our app implementation bug.

We heavily use AI to write our BLE stack. Maybe kable is just more simpler for AI.

[philips77]

Thanks for the explanation. I'll investigate.