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osdp_RAW (0x50) and osdp_FMT (0x51) — card data reports.
§Spec: §7.10, §7.11
RAW carries a raw bit array: reader (1) + format_code (1) +
bit_count (2 LE) + bytes. bytes is ceil(bit_count / 8) bytes;
trailing bits in the final byte beyond bit_count are reserved and must
be ignored.