MQTT (Message Queuing Telemetry Transport) is a popular messaging protocol for IoT applications. While simple and lightweight, there are some common questions and issues that arise when using MQTT.
Topic Naming: What is the best practice for naming MQTT topics? Short, unique and descriptive topic names using slashes as separators are recommended. Avoid spaces and special characters.
Authorization: MQTT brokers typically support authentication and authorization of clients through username/password. Make sure to secure your broker to restrict access.
Message Queueing: MQTT brokers will queue messages for offline subscribers. Check your broker settings to control queue limits and behaviour.
Redundancy: For critical applications, consider deploying redundant MQTT brokers and clients to ensure high availability.
Device Identification: Assign unique client IDs to devices to avoid conflicts when they reconnect. Brokers will typically reject duplicate client IDs.
Flooding: Monitor your MQTT traffic to detect and mitigate potential message flooding from malicious clients. Brokers have settings to limit message throughput per client.
Testing: consider using MQTT testing and simulation tools to validate your configuration before deploying to production. This can catch common issues early.
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