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  • You could try changing gat.getPrimaryService("0xFF02") to gat.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?


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