ble_app_gls example not working after central/Handphone forget paired it

Question

With the SDK_11 s130 ble_app_gls on nRF51-dk, i am able to pair and bond with the board with Android 6.0 as central. But if the user forget the paired device on the android phone, then it will not be possible to connect it again. The only way to recover is to flash the S130+ gls application. 
 Are there any insights from the rest of the guys out there. Thanks...

Einar Thorsrud · Accepted Answer

In order to re-connect in this case, bonding information must be deleted from the peripheral. Most examples, including the Glucose Application , support this. Holding button 2 during startup , will cause existing bonds to be erased. 
 From the example main() you can see that erase_bonds is set to true if there is a BSP_EVENT_CLEAR_BONDING_DATA start up event. This is used as a parameter to peer_manager_init() , where it is checked. If true , pm_peers_delete() is called, which deleting all data stored for all peers. 
 The default behavior of the example (and the Peer manager) is to disallow re-pairing. In the example's Peer manager event handler ( pm_evt_handler() ) you can see that there is handling for the PM_EVT_CONN_SEC_CONFIG_REQ event. If you change the allow_repairing flag to true , the central will be allowed to pair again even if it has already been paired.