How to add bond function to SDK12.3.0\app_ble_uart

Question

Hi, I am trying to add numeric comparison function to the project nRF5_SDK_12.3.0_d7731ad\examples\ble_peripheral\app_ble_uart\pca10028\s130. in the project, there is no support for bonding.so i added the fds and peer_manager reference to the project app_ble_hrs. but there are something wrong with my code. i was modified ble_evt_dispatch : static void ble_evt_dispatch(ble_evt_t * p_ble_evt) { ble_conn_params_on_ble_evt(p_ble_evt); ble_nus_on_ble_evt(&m_nus, p_ble_evt); on_ble_evt(p_ble_evt); ble_advertising_on_ble_evt(p_ble_evt); //bsp_btn_ble_on_ble_evt(p_ble_evt); pm_on_ble_evt(p_ble_evt); dbgPrint("evt id = %d
", p_ble_evt->header.evt_id);//testonly } i printed the ble_evt_id in ble_evt_dispatch() as follows: connected evt id = 16 evt id = 18 evt id = 18 evt id = 18 evt id = 19//BLE_GAP_EVT_SEC_PARAMS_REQUEST evt id = 18 disconnected//out of 30 seconds so the link has been disconnected evt id = 17 by debug i found there is a error in pm_evt_handler() {case PM_EVT_ERROR_UNEXPECTED:},i don't know why this error occurs. can i get an example of app_ble_uart with bond function? any sugestions would be helpful. Best Regards.

Einar Thorsrud · Accepted Answer

Hi, 
 A1. There is no way to confirm the value on only one side. If only one side can confirm, then the only option is just works unauthenticated pairing. However, this issue seems a bit odd. The Android Bluetooth stack should not have any problems with numeric comparison - it should be handled out of the box. 
 A2. If I understand correct, at this point the Android side has deleted the bonding information, but the nRF still has the bonding information. To fix this you should either delete the bond information on the nRF as well (for instance by power cycling while holding a button like in the SDK examples), or you can modify it so that it allows repairing. If you want to do that, you should search for this line (in the handling of the PM_EVT_CONN_SEC_CONFIG_REQ event): 
 pm_conn_sec_config_t conn_sec_config = {.allow_repairing = false}; 
 and modify it to: 
 pm_conn_sec_config_t conn_sec_config = {.allow_repairing = true};

How to add bond function to SDK12.3.0\app_ble_uart

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