feat: MQTT 5.0 support#1088

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BenjaminDobler:feat/mqtt5

Commits on Jun 23, 2026

feat: MQTT 5.0 support (phase 1 - handshake + property pass-through)

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feat: MQTT 5.0 topic alias (inbound) and CONNACK capabilities

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feat: MQTT 5.0 subscription identifiers

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feat: MQTT 5.0 session expiry interval

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feat: MQTT 5.0 server-initiated DISCONNECT

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feat: MQTT 5.0 will delay interval

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feat: MQTT 5.0 UNSUBACK reason codes and CONNACK capabilities

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feat: MQTT 5.0 message expiry interval for queued messages

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feat: MQTT 5.0 shared subscriptions ($share)

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feat: MQTT 5.0 maximum packet size flow control

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feat: MQTT 5.0 retained-message expiry and 0x87 not-authorized acks

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test: stabilize MQTT 5.0 suite (fully-awaited teardown + sequential connects)

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feat: MQTT 5.0 Assigned Client Identifier and Server Keep Alive

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docs: document and type the MQTT 5.0 broker options

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