Bit mask representing the state of the LEDs on the module.
Each LED is represented by 2 bits. LED #33 state is
indicated by the 2 least significant bits. LED #48 state
is indicated by the 2 most significant bits. How this bit
mask is interpreted depends on the module ID. For example,
some modules use this value to indicate a LED is flashing
(value of '01') or a solid color (value of '00').
This value can be used by a NMS that needs to know this
information for whatever reason. Some modules may not
support this value in which case it should be set to zero.