Hello everyone How are you Please can you give me some idea

Question

Hello everyone How are you Please can you give me some idea about the following trouble ```override suspend fun dataOad characteristic Characteristic Flow lt ByteArray gt return peripheral value observe characteristic onStart Log debug AudioProcessorImpl dataOad onStart onEach Log debug AudioProcessorImpl dataOad onEach onCompletion Log debug AudioProcessorImpl dataOad onCompletion ``` If I cancel the scope that calls dataOad and create it again the observe works fine But if the peripheral close the connection and I reconnect the observer does not work anymore disappointed It is necessary close the application and reopen it

travis · Answer

Are you using the same `Peripheral` object the `peripheral` that is referenced in your example to reconnect i e you re not creating a new `Peripheral` when you reconnect right

Francis Mariano · Answer

Hello Travis Yes it is the same object

Francis Mariano · Answer

I think I know what is happening but dunno is my error or bug in kable or expected behavior in kable When I call the observe for first time the library sets the characteristic notification ```2022 07 15 10 43 31 483 29445 29445 com me stxbt D Kable Peripheral 54 6C 0E 35 75 17 setCharacteristicNotification service 00000427 0000 1000 8000 00805f9b34fb characteristic 00000430 0000 1000 8000 00805f9b34fb value true 2022 07 15 10 43 31 486 29445 29445 com me stxbt D Kable Peripheral 54 6C 0E 35 75 17 write service 00000427 0000 1000 8000 00805f9b34fb characteristic 00000430 0000 1000 8000 00805f9b34fb descriptor 00002902 0000 1000 8000 00805f9b34fb 2022 07 15 10 43 31 535 29445 29739 com me stxbt D Kable Callback 54 6C 0E 35 75 17 onDescriptorWrite service 00000427 0000 1000 8000 00805f9b34fb characteristic 00000430 0000 1000 8000 00805f9b34fb descriptor 00002902 0000 1000 8000 00805f9b34fb status GATT SUCCESS 0 ``` When I cancel the scope ```2022 07 15 10 44 33 759 29445 29445 com me stxbt D Kable Peripheral 54 6C 0E 35 75 17 write service 00000427 0000 1000 8000 00805f9b34fb characteristic 00000430 0000 1000 8000 00805f9b34fb descriptor 00002902 0000 1000 8000 00805f9b34fb``` The characteristic notification is not disabled when I recreate the scope and calling the observe again the setCharacteristicNotification is not executed but I received the `onCharacteristicChanged` because it was not disabled previously But if the peripheral hardware close the connection peripheral is turn off its characteristic notification is disabled So when I reconnect and calling the observe again the the setCharacteristicNotification is not executed in this case I do not receive the `onCharacteristicChanged`

Francis Mariano · Answer

I have some news As workaround I will keep always alive the scope of the observer When the scope keep alive the kable library always calls setCharacteristicNotification and write when observe a characteristic again even if the peripheral hardware is turned off So can be a problem with library Steps for reproduction 1 Observe a characteristic 2 Cancel the scope of observation 3 Turn off the peripheral hardware and turn on it 4 Reconnect with the peripheral 5 Observe the characteristic again

travis · Answer

Thanks for sharing your workaround Unfortunately I m swamped with another project at the moment so don t have a lot of time to work on Kable in the near term I hope to get back to Kable development after the current project I m on wraps up In the mean time I ve created <https github com JuulLabs kable issues 358> to track this issue Thanks again

Francis Mariano · Answer

Okay Travis Thanks for your support