Writing MAC address to security memory via device data provider or via RCX_SET_MAC_ADDRESS_REQ (with store permanent bit set) corrupts zone1 of security memory

The device data provider modifies whole zone1 when writing the MAC address (ulDataType=EXT_DEVICE_DATA_TYPE_MACADDR) only.

As only whole areas of security memory can be written it is neccessary to perform a ready-modify-write approach.

Known workarounds:

• Use RCX_SECURITY_EEPROM_WRITE_REQ to write whole zone 1
• Use ulDataType=EXT_DEVICE_DATA_TYPE_SECMEM_DATA to write whole zone 1, when calling device data provider directly