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Serial Integration Checklist

  1. Build payload as UTF-8 :<port><route> string, with \n<json> body when required.
  2. Prefix payload length (4-byte BE).
  3. Compute CRC16 over Length || Payload.
  4. Append CRC (2-byte BE).
  5. Send frame.
  6. Read and validate response frame.
  7. Parse response JSON as the standard response envelope.