Bonding must always be re-established after NimBLEDevice::deinit(false).

[RunpoThomas]

Hello, I am currently trying to equip a battery-powered device with NimBLE to send sensor data to a smartphone.

Hardware used: ESP32-S3 Programming environment: Arduino IDE 2.3.2 Library: NimBLE-Arduino 1.4.2

To save battery I use the command “NimBLEDevice::deinit(false)” after advertising when no device is connected to the server. I want to bond the server with the smartphone once and then a connection should always be possible.

Implementation of the secure connection:

class MyServerCallbacks : public NimBLEServerCallbacks {

  void onConnect(NimBLEServer* pServer, ble_gap_conn_desc* desc) {
    NimBLEDevice::setSecurityAuth(true,true,true);
    NimBLEDevice::setSecurityIOCap	(0x00);
    NimBLEDevice::setSecurityInitKey	(BLE_SM_PAIR_KEY_DIST_ENC |  BLE_SM_PAIR_KEY_DIST_ID);
    NimBLEDevice::setSecurityRespKey(BLE_SM_PAIR_KEY_DIST_ENC |  BLE_SM_PAIR_KEY_DIST_ID);	
    _pin = esp_random() % 900000 + 100000;
    NimBLEDevice::setSecurityPasskey(_pin);
    Serial.println(_pin);
    NimBLEDevice::startSecurity	(desc-> conn_handle);
    
    deviceConnected = true;
    NimBLEAdvertising *pAdvertising = NimBLEDevice::getAdvertising();
    pAdvertising->stop();
  }

  void onDisconnect(NimBLEServer *pServer, ble_gap_conn_desc *desc) {
    deviceConnected = false;
  }
};

Error message: E (231388) NimBLE: failed to configure restored IRK

The passkey must be entered again for each connection. I have not found any information about this problem. This problem does not occur without the deinit() function. I would be very grateful for help.