Well... I made a server and if you want to know, here is what you want
In the packet 210, you send 0x03 and 0x0C
Replace the C by the color you want.
0x03 0x01 = #c1# = white
0x03 0x02 = #c2# = yellow
0x03 is one byte with the value 3 and 0x01 is an another byte with the value 1...
I hope this will help