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@Gordon
You could try changing
gat.getPrimaryService("0xFF02")togat.getPrimaryService(0xFF02)(and the same for the characteristic too) - I'm not 100% sure but that might make some difference.What you're doing with Uint8Array sounds fine, but then
"\x00\xFF\x00\x00"or even just[0,255,0,0]should work as well.And if you do the same from an app like
nRF connect, you can change the light's colour?