Unsubscribe from indication before teardown? Is it notneeded/recommended/mandatory?

Nuki APIs Bluetooth API
1

Folks,

I have my own implementation of controlling Nuki SL2.0 over Bluetooth GATT.

Everything is working as intended, but sometimes I have to restart the client’s bluetooth stack (ESP32).

My pseudo-procedure is:
1.) Connect to SL
2.) Subscribe to indication
3.) Send some command
4.) Retrieve some response
5.) Disconnect

Also, there is a BLE scanner, which queries the SL state in case it’s needed (based on TX power).

When I execute a Lock operation, after step5 above, client immediately tries to do a ReadState operation, which sometimes causes some UB in Bluetooth stack (esp32).

Something came into my mind: do I have to unsubscribe from indications before disconnect?

Thank you!

2

Hi Daniel,

No, it is not necessary to unsubscribe first.
The subscription is bound to the connection and invalidated once the connection is closed.

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