pstorage_clear or dm_device_delete_all is not working?

Question

Custom Board with MCU NordicSemi nRF51822-QFAA 
 
 
 Softdevice S110 7.1 
 
 
 IAR for ARM 7.1 
 
 
 SDK 7.2 using a merged service (HID keyboard example + NUS example + HRS example) 
 
 
 Testing with iPhone 5S, 6 and iPad air (iOS 8.1.3) 
 
 
 / Nexus 5 and Galaxy Note 3 (Android 4.4.2). 
 /****************************************************************************/ 
 I added codes in device_manager_peripheral.c 
 void dm_ble_evt_handler(ble_evt_t * p_ble_evt){ //skipping to the changed part

 case BLE_GAP_EVT_AUTH_STATUS:
 if (p_ble_evt->evt.gap_evt.params.auth_status.auth_status != BLE_GAP_SEC_STATUS_SUCCESS){
 event_result = p_ble_evt->evt.gap_evt.params.auth_status.auth_status;
 }

 else{
 
 if ((m_connection_table[index].state & STATE_LINK_ENCRYPTED) ==
 STATE_LINK_ENCRYPTED)
 {
 m_connection_table[index].state |= STATE_BONDED;

 if (m_connection_table[index].bonded_dev_id == DM_INVALID_ID)
 {
 //Assign a peer index as a new bond or update existing bonds.
 err_code = device_instance_allocate((uint8_t *)&device_index,
 &m_connection_table[index].peer_addr);
 //Allocation successful.
 if (err_code == NRF_SUCCESS)
 { /*...*/}

 else
 {
 event_result = err_code;

 // my added part
 if(err_code == DM_DEVICE_CONTEXT_FULL){
 err_code = pstorage_clear(&m_storage_handle,
 (ALL_CONTEXT_SIZE * DEVICE_MANAGER_MAX_BONDS));
 //err_code = dm_device_delete_all(m_handle_pointer);
 //m_handle_pointer is an extern variable pointing m_app_handle in main.c
 
 }
 }
 }
 
 The code's content is if the number of bonds reaches DEVICE_MANAGER_MAX_BONDS, 
 it will delete every bond infos. 
 Although the example code is implemented to erase all bonds when 
 BOND_DELETE_BUTTON_ID is pressed before initializing variables, I want to erase all bonds 
 automatically regardless of the button press. 
 I tried both pstorage_clear and dm_device_delete_all. 
 Even though both returned err_code 0 (NRF_SUCCESS), 
 it seems that the flash hasn't been cleared. 
 After the number of bonds reaches DEVICE_MANAGER_MAX_BONDS and calls these functions, 
 nothing happens. 
 Is there something that I'm missing? 
 Does these functions returning NRF_SUCCESS has relations with 
 DM_EVT_DEVICE_CONTEXT_DELETED (or other MACROS) or the scheduler? 
 Edited : About callback 
 I'm debugging with J-link. 
 
 I set a break point here. After I call pstorage_clear, however, it doesn't 
 call dm_pstorage_cb_handler. 
 What could be the problem? Or did I misunderstand about "getting the callback from pstorage"? 
 -Regards, Mango922

Annim · Accepted Answer

I suggest you to not to make any further api calls inside the pstorage_callback_handler as its is not suppose to have the re-entrant scope. I see and thinks the best practice would be better set some flags here and then handle the corresponding functionality somewhere in the main context. 
 Becasue, if you call pstorage_clear() within the callback block, it will again try to fall back to this pstorage call back handler, which is queued by softdevice, and both have same priority, thus it will never gona pocess. Hope this make sense. 
 Do take a look: Here | Hope you may find this useful.

pstorage_clear or dm_device_delete_all is not working?

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