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Updating password for bonding

Fred Visticot
Expert 1120 points

I'm using the following code to ask for the user for a password (set by default to 000000) + a GATT_PERMIT_AUTHEN_READ attribute.

All is working fine but :

- what is the best process to allow the user to change this default password for the first time he is using the device ?

- Do I need to use a profile characteristic to manage this password ?

Tx for your help !

{
uint32 passkey = 0; // passkey "000000"
uint8 pairMode = GAPBOND_PAIRING_MODE_WAIT_FOR_REQ;
uint8 mitm = TRUE;
uint8 ioCap = GAPBOND_IO_CAP_DISPLAY_ONLY;
uint8 bonding = TRUE;
GAPBondMgr_SetParameter( GAPBOND_DEFAULT_PASSCODE, sizeof ( uint32 ), &passkey );
GAPBondMgr_SetParameter( GAPBOND_PAIRING_MODE, sizeof ( uint8 ), &pairMode );
GAPBondMgr_SetParameter( GAPBOND_MITM_PROTECTION, sizeof ( uint8 ), &mitm );
GAPBondMgr_SetParameter( GAPBOND_IO_CAPABILITIES, sizeof ( uint8 ), &ioCap );
GAPBondMgr_SetParameter( GAPBOND_BONDING_ENABLED, sizeof ( uint8 ), &bonding );
}

  • 0
    Expert 1160 points

    It is safer to have a profile characteristic with value permissions set to GATT_PERMIT_AUTHEN_WRITE. That way, whenever a value is written to this characteristic, you give a callback to your application, where you change the password.

    uint32 newValue;

  switch( paramID )
  {
    case SIMPLEPROFILE_CHAR2:
      SimpleProfile_GetParameter( SIMPLEPROFILE_CHAR2, &newValue );
      GAPBondMgr_SetParameter( GAPBOND_DEFAULT_PASSCODE, sizeof ( uint32 ), &newValue );

      #if (defined HAL_LCD) && (HAL_LCD == TRUE)
        HalLcdWriteStringValue( "Char 3:", (uint16)(newValue), 10,  HAL_LCD_LINE_3 );
      #endif // (defined HAL_LCD) && (HAL_LCD == TRUE)

      break;

    default:
      // should not reach here!
      break;
  }

    I am using SIMPLEPROFILE_CHAR2 for storing passkey.