The ble_evt_dispatch function does not execute.

[Jim]

Hi! 

I use softdevice3.0.0 , SDK12.1.0, Keil IDE, PCA10040 Development board, 

I am going to create a multilink_central_NUS project using the ble_app_multilink_central example.

Immediately after turning on the power, it seems to work well.
However, after an irregular period of time, the softdevice seems to stop.

For testing, we made a periodic timer and toggled the LED every 5 seconds.
This confirmed that timer, uart, and gpio are working normally.
The ble_evt_dispatch function is not executed.
Is there a bug found for this?

If you need my project to check, I am willing to send you a project.

[Hung Bui]

Hi,

What exactly you observed when the softdevice stopped ? Have you found the issue on the central side or the peripheral side ?

How long did it take for the issue to appear ? Could you record a sniffer trace ?

[Jim]

When Softdevice stopped, I noticed that only Bluetooth not worked.
After debugging with the Keil IDE, the nRF52832 was still running the while loop in the main loop.
It will take an average of 1 hour for the problem to appear.
I do not know how to track sniffer since I have not tried it.

[Hung Bui]

Have you check if your peripheral gets back to advertising ? Could you check the disconnect reason (when BLE_GAP_EVT_DISCONNECTED event happens) 

Please try to use the sniffer and send us the trace. But you need to make sure you managed to capture the connection. 

[Jim]

Yes, I checked it!

My peripheral is advertising after disconnect. 

Disconnect reason is 0x3E, 0x13.

If nRF52832 do not try to connect, the scan function will not stop.

[Hung Bui]

If it's 0x13 it means BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION, the peer device decided to disconnect. 

If it's 0x3E it means BLE_HCI_CONN_FAILED_TO_BE_ESTABLISHED, the connection request packet is not receive by the peer side. 

Please try to capture a sniffer trace. 

[Jim]

I tried to capture the sniffer, but failed to create the capture environment. wireshark does not display information toolbars.
I'm looking for a way to solve the problem in devzone.

Separately, I think I found the cause of the problem using printf.
I use nRF52832 as central and use iPhone as peripheral. iPhone will change its Mac address every 15 minutes.
Symptoms occur when the Mac address of iPhone changes at the time of after sd_ble_gap_connect function in nRF52832 and before BLE_GAP_EVT_CONNECTED event occurs.

Have you reported any of these issues?

[Hung Bui]

Hi,

It's normal that the iPhone change the advertising address every 15 minutes. But please clarify: 

- How does your application work ? If there is a disconnection, and the phone advertises again, would you connect automatically ? How do you detect the phone to reconnect ?

- Do you have bonding ? it should be fine if the phone change the address, the central should be able to detect the phone even if the address changed.