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  • I've attached the exact code I used and below is the console output.

        idx 4
        buf 1000
        line 4
        idx 109
        buf 1000
        line 109
        idx 2
        buf 1000
        line 2
        idx 109
        buf 1000
        line 109
        idx 2
        buf 1000
        line 2
        idx 109
        buf 1000
        line 109
        idx 4
        buf 1000
        line 4
        idx 111
        buf 1000
        line 111
        idx 4
        buf 1000
        line 4
        idx 110
        buf 1000
        line 110
        idx 4
        buf 1000
        line 4
        idx 110
        buf 1000
        line 110
        idx 2
        buf 1000
        line 2
        idx 110
        buf 1000
        line 110
        idx 4
        buf 1000
        line 4
        idx 110
        buf 1000
        line 110
        idx 5
        buf 1000
        line 5
        idx 110
        buf 1000
        line 110
        idx 4
        buf 1000
        line 4
        idx 110
        buf 1000
        line 110
        idx 4
        buf 1000
        line 4
        idx 109
        buf 1000
        line 109
        idx 3
        buf 1000
        line 3
        idx 110
        buf 1000
        line 110
        idx 2
        buf 1000
        line 2
    

    With the attached code "line" is only 4 bits in length;

    JSON.stringify(line) "new Uint8Array([37,0,37,32])"

    Using the original working code I managed to get a complete frame of data in line which I've pasted below.

        >USB.print(JSON.stringify(line));
        "?\x00?D\x00DD\x00D?\x00?9\x0094\x004/\x­00/*\x00*$\x00$ \x00 \x1B\x00\x1B\x17\x00\x17\x13\x00\x13\x0F­\x00\x0F\f\x00\f\f\x00\f\x0F\x00\x0F\x13­\x00\x13\x17\x00\x17\x1B\x00\x1B \x00 $\x00$*\x00*/\x00/4\x0049\x009?\x00?D\x0­0DD\x00D?\x00??\x00?D\x00DD\x00D?\x00?9\­x0094\x004/\x00/*\x00*$\x00$ \x00 \x1B\x00\x1B\x17\x00\x17\x13\x00\x13\x0F­\x00\x0F\f\x00\f\f\x00\f\x0F\x00\x0F\x13­\x00\x13\x17\x00\x17\x1B\x00\x1B \x00 $\x00$*\x00*/\x00/4\x0049\x009?\x00?D\x0­0DD\x00D?\x00??\x00?D\x00DD\x00D?\x00?9\­x0094\x004/\x00/*\x00*$\x00$ \x00 \x1B\x00\x1B\x17\x00\x17\x13\x00\x13\x0F­\x00\x0F\f\x00\f\f\x00\f\x0F\x00\x0F\x13­\x00\x13\x17\x00\x17\x1B\x00\x1B \x00 $\x00$*\x00*/\x00/4\x0049\x009?\x00?D\x0­0DD\x00D?\x00??\x00?D\x00DD\x00D?\x00?9\­x0094\x004/\x00/*\x00*$\x00$ \x00 \x1B\x00\x1B\x17\x00\x17\x13\x00\x13\x0F­\x00\x0F\f\x00\f\f\x00\f\x0F\x00\x0F\x13­\x00\x13\x17\x00\x17\x1B\x00\x1B \x00 $\x00$*\x00*/\x00/4\x0049\x009?\x00?D\x0­0DD\x00D?\x00??\x00?D\x00DD\x00D?\x00?9\­x0094\x004/\x00/*\x00*$\x00$ \x00 \x1B\x00\x1B\x17\x00\x17\x13\x00\x13\x0F­\x00\x0F\f\x00\f\f\x00\f\x0F\x00\x0F\x13­\x00\x13\x17\x00\x17\x1B\x00\x1B \x00 $\x00$*\x00*/\x00/4\x0049\x009?\x00?D\x0­0DD\x00D?\x00??\x00?D\x00DD\x00D?\x00?9\­x0094\x004/\x00/*\x00*$\x00$ \x00 \x1B\x00\x1B\x17\x00\x17\x13\x00\x13\x0F­\x00\x0F\f\x00\f\f\x00\f\x0F\x00\x0F\x13­\x00\x13\x17\x00\x17\x1B\x00\x1B \x00 $\x00$*\x00*/\x00/4\x0049\x009?\x00?D\x0­0DD\x00D?\x00??\x00?D\x00DD\x00D?\x00?9\­x0094\x004/\x00/*\x00*$\x00$ \x00 \x1B\x00\x1B\x17\x00\x17\x13\x00\x13\x0F­\x00\x0F\f\x00\f\f\x00\f\x0F\x00\x0F\x13­\x00\x13\x17\x00\x17\x1B\x00\x1B \x00 $\x00$*\x00*/\x00/4\x0049\x009?\x00?D\x0­0DD\x00D?\x00??\x00?D\x00DD\x00D?\x00?9\­x0094\x004/\x00/*\x00*$\x00$ \x00 \x1B\x00\x1B\x17\x00\x17\x13\x00\x13\x0F­\x00\x0F\f\x00\f"=undefined
    > 
    
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