Networking

MQTT and cloud communication: the topics, the connection lifecycle, and the event protocol carried over them. Together these enable reliable communication between nodes and the cloud infrastructure.

• Complete MQTT Topic Reference – complete reference of every MQTT topic the firmware uses: topic variables (thing name, group info string), cloud communication topics (to_cloud, from_cloud), parameter control topics, group control topics, named and indexed shadow topics (update, delete, get/accepted), timeseries topics, notification topics, bridge topics, and the subscription patterns.

• MQTT Connection Management – connection and authentication, reconnection behaviour with exponential backoff, session management (clean vs persistent), keep-alive and connection health monitoring, reconnection task execution, and MQTT budgeting (rate limiting).

• Cloud Communication – the event communication model (get/set events), response behaviour and patterns, the version handshake, every get event (getGroupInfo, getAlexaEn, getGVAEn, getSchedVer, getTriggerVer, getSchedDetails, getTriggerDetails, getTimeSync), every set event (setNodeConfig), the bridge events, and the event payload formats.

Related Topics

• State Management – how MQTT topics are used in state reporting

• Initialization and Startup Sequence – initialization sequence and connection setup

• Error Handling and Recovery Strategies – error handling and recovery strategies