MQTT

MQTT is a lightweight publish/subscribe protocol designed for constrained devices, unreliable networks, and applications that need efficient real-time message delivery. FlowMQ supports MQTT 3.1.1 and 5.0.

Supported Features

• MQTT 3.1.1 and 5.0
• QoS 0, 1, and 2
• Hierarchical topics
• + and # wildcard subscriptions
• Retained messages
• Last Will messages
• Shared subscriptions
• MQTT 5 message and subscription properties

Common Use Cases

• IoT telemetry collection
• Device command and control
• Connected vehicle messaging
• Industrial equipment monitoring
• Mobile and real-time applications
• Online status and presence updates

Limitations and Compatibility Notes

• Retained messages are not delivered to subscriptions whose Topic Filter contains the + or # wildcard. Retained-message delivery is supported only for exact Topic Filters.
• Client Identifier collision detection is node-local. If clients using the same Client Identifier connect to different FlowMQ nodes, the duplicate connection is not detected and the existing client connection is not disconnected.
• Persistent Session takeover is node-local. A client can take over an existing Persistent Session only when the new connection reaches the same FlowMQ node. Cross-node session takeover is not supported.