BLE NUS missing BLE_NUS_EVT_RX_DATA data

[Andreas48752]

Hi everone!

I am developing with SDK17.0.2 and using the nordic NUS peripheral example.

I am seeing a strange effect:

I am connecting from an android mobile and when I try to send two packets right after another the second one overwrites somehow the first data:

NRF52840 does get two  BLE_NUS_EVT_RX_DATA events but both times with the second data? The first data sent is never given to my application.

If I put in a pause between the two messages on android I get both messages right.

Maybe anyone has a clue why this is happening? I am using the nordic UARTService on android. 

My Send waits till "onCharacteristicWrite" is called before sending the second message.

Thanks,

Andreas

[Simonr]

Hi

Sorry about the misunderstanding! The same still goes for Android development though. If you keep on writing in a lopp to a characteristic you might be overwriting the previous packet before the data is sent, and you will need to write, then wait for the write callback before writing the next packet.

Best regards,

Simon

[Andreas48752]

Hi,

I am already waiting on the mobile side for the "onCharacteristicWrite" callback (see above code and "SetWriteState"). So data should already be sent by mobile when sending next data is done.

Is it possible that incomming data on NRF5 side is overwriten before event handler for receiving is called?