Hdtc Format Jun 2026

| Field | Size (bytes) | Description | |--------------|--------------|--------------------------------------| | MAGIC | 2 | 0xHDTC (0x48445443) | | VERSION | 1 | Major.minor (nibbles) | | FLAGS | 1 | Compression, endianness, checksum type | | NODE_COUNT | 2 | Number of tree nodes | | RESERVED | 2 | For future use | | DATA_SEGMENT | variable | Serialized node table + values | | CHECKSUM | 2 or 4 | CRC-16 or CRC-32 |

An HDTC message consists of: