calling sd_ble_gap_disconnect() from BLE_GATTC_EVT_READ_RSP in ble_evt_handler resets device

[TheyCallMeNobody]

Hello,

I have one central and one peripheral device connected over BLE. The peripheral has a custom service characteristic containing the firmware Version value. After connecting, the central device is discovering the service via ble_db_discovery_start() and after finding it, the characteristic is read by calling sd_ble_gattc_read(). When the BLE_GATTC_EVT_READ_RSP event is triggered, I'm checking the firmware version, and if it does not match I want to disconnect the device by calling sd_ble_gap_disconnect(). My problem is, that calling the disconnect function leads to a reset of the device. How can I fix this? I'm using SDK Version 17.1 and the Softdevice is S140.

Thanks

[Hieu]

Hi TheyCallM... er... hi!

How are you handling the return value of sd_ble_gap_disconnect()?

Hieu

[TheyCallMeNobody]

Hi Hieu,

the return value of sd_ble_gap_disconnect() is always 0.

In this Thread is mentioned, that it may have something to do with the interrupt priority of the event. May this be the problem?

[Hieu]

Yes, that would be the next point to check in most cases considering a handler.

Instead of executing the function there, could you please try raising a flag and in the main loop call sd_ble_gap_disconnect() when that flag is set? (and of course, lower the flag there).

[TheyCallMeNobody]

I just tried it, unfortunately the behaviour doesn't change. I'm calling sd_ble_gap_connect() directly in the main loop after the flag is set. It returns 0 but then resets. I also tried setting an invalid conn handle, the it doesn't reset and the method returns an error.

Edit: The Interrupt Priority returned by sd_nvic_GetPriority(SD_EVT_IRQn, &oldPrio) is 6. Also I have a smartphone connected via BLE/UART (Smartphone is master). When I call the disconnect function with the connHandle of the smartphone it just works fine. Can there be a problem, that the peripheral Device is just not completely initialized?

[Hieu]

That should not happen. Are you able to replicate what you are doing on another example? If yes, could you please do that and send me the source files and I dive into it.