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fix: CRC placement in frame send indexes past data array bounds - #18
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Frame::send()places the CRC after the payload by indexing intodata.raw[len]anddata.raw[len+1].data.rawis[u8; 64], so whenlen == MAX_PAYLOAD(64), index 64 is past the array. This is caused a panic during testing.The fix uses struct-relative pointer math from the Frame base, which is valid for all payload sizes since Frame is
#[repr(C)]and thecrcfield immediately follows data.Still hacky for sure, but it doesn't cause panic.