App receiving write responses but not receiving the request in the NRF_SDH_BLE_OBSERVER callback

[Scribble]

Hi guys,

We're currently experiencing a very strange issue when we perform the following process of writing to a characteristic in an nRF52840 running SDK 15.2.0 and SoftDevice 140 6.1.0:

1. Write to Characteristic N and receive success response, we DO see the write request in the NRF_SDH_BLE_OBSERVER callback.
2. Write Without Response to Characteristic N multiple times (bulk transfer).
3. Write to Characteristic N and receive success response, but we DON'T see the write request in the  NRF_SDH_BLE_OBSERVER callback and so never explicitly send a response.

We of course expect in point 3 to see the request in the NRF_SDH_BLE_OBSERVER callback. We're currently trying to determine if the bug is app side or device side.

Has anyone else experienced or can explain this behaviour?

Many thanks

[bjorn-spockeli]

HI Alistair, 

do you have a sniffer trace of the on air packets between the two peers? It would be very useful in analyzing wahts going on here. Also, in point 3: Are you performing Write Requests with/without Authorization or Write Commands  with/without Authorization?

Best regards

Bjørn