• What you're doing looks ok... Can you try just sending the data explicitly with:

    function makearr(){
      return [0x56, 0xff, 0x08, 0x5a, 0x00, 0xf0, oxaa];
    }
    

    It'd remove one potential source of problems. I notice that what you're sending isn't related to what's in the comment at all - is that intentional?

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