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MQTT CONNECT Packet Connect Flags Decoder

Decodes MQTT v5.0/v3.1.1 CONNECT packet variable header Connect Flags 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: Bitwise extraction of Clean Start, Will Flag, Will QoS, Will Retain, Password Flag, User Name Flag

Checks: Valid connect flags byte bitmask

Calculated locally in browser memory; nothing leaves your browser.

Deterministic local-first client-side execution. Provided as-is without warranty.