Your message of:
février 3, 2016 at 12:13
=> Great your key is detected and working!
I do not know why the color changes, but you can try adding a network key.
It’s always better for security.
This is an example network key:
0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x06, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0x10
Does your documentation say something about when the key is flashing?