MQTT Control Packet Type & Fixed Header Decoder
Decodes MQTT fixed header control packet types and flags from the first byte.
Notice: engineering verification utility. Use test or de-identified data and verify results independently before relying on them.
How it works
Standard: MQTT Version 5.0 Protocol Specification
Formula: Packet type = First Byte >> 4, Flags = First Byte & 0x0F
Checks: Valid MQTT control packet type (1 to 15)
Calculated locally in browser memory; nothing leaves your browser.
Deterministic local-first client-side execution. Provided as-is without warranty.