identify
1.3.6.1.4.1.2011.2.235.1.1.1.11
identify use to control on or off of led.
identify mode:
0 - Off
1 - Temporary On
2 - Force Identify On
set format: <mode>,[ontime]
get format: <mode>
When <mode> = 0 or <mode> = 2,
the format is only <mode>.
[ontime] is option and value is in [1,255],
When set Temporary On without [ontime],
The default Temporary On time are 15 seconds.