Zephyr/nRF Connect SDK one peripheral with multiple central

[Quard]

Hello, I started learning BLE/nrf about a week ago and I faced an issue that I unable to handle more than one connection simultaneously.

I have a pretty simple application build with nRF Connect SDK that provide peripheral device on my nrf5340-pdk with one service, build on top of "nRF Connect SDK Tutorial | NCS v1.4.0". And if I have one device(phone) connected to PDK then I couldn't connect from another phone until first will be disconnected.

I have tried to change CONFIG_BT_MAX_CONN and some other parameters, but it doesn't help. Also, I have found the example 'peripheral_bms' should support up to 2 devices, but I can not connect from two devices even with this example.

Could you please give me directions on how to deal with multiple connections in one peripheral device? Maybe I have missed some sample, that implements it, available in Zephyr or nRF Connect SDK.

[Hung Bui]

Hi Vadym, 

Have you advertise again after you get connected ? 
By default the stack will stop advertising after getting connected. 

So when you get connected you would need to call bt_le_adv_start() to start advertising again. 

[Quard]

Yes, I tried but it was not successful, probably because of other changes that I made.

After the rollback, I tried to do it again and for now, I can, at least, connect two devices. After the second connection bt_le_adv_start return "-61" error. But I realized that such behavior not correct and I need to pair devices and run advertise only when I need to create a new pair.

Actually starting of new advertise after connect starts working only after I add "CONFIG_BT_LL_SOFTDEVICE_DEFAULT=y" to the settings.

Thank you for your help.

Sample "peripheral_hids_mouse" implements such behavior.
And my solution could be found here https://github.com/Quard/nrf_ble_rolling_shutter_poc/tree/restart_advertising