NRF SD MTU Data Overflow Handling

[Ankit Bhatnagar]

Hi,

I have a working system based on NRF52832, SD132 and SDK 15.0. I am working with with the default MTU as my data requirement is low and everything is working great.

I recently noticed that if however I send data of size more than 20 bytes from the nrf connect app, my application on nrf52 becomes unresponsive (the control does not land in the GATT write cb function) and on the nrfconnect side, I can see the spinner moving for some time and then it eventually drops the ble connection. If I then reconnect, I am able to and work just like before. However sometimes doing this completly crashes my user application on nrf52.

Is there a provision in softdevice for notifying the user application about such MTU overflow situations so that they can be gracefully handled ?

Thanks !

[Sigurd]

Hi,

Ankit Bhatnagar said:

nrf connect app

Is this the phone app or the desktop app?

What version of nRF Connect are you using ?

If this is the phone app, what phone are you using?

When I test this on the phone app, I get "Error 128 (0x80): GATT NO RESOURCES" when I try to send more than 20 bytes with the default ATT MTU.