MQTT Telemetry Cases

Zoho IoT provides dedicated topics for specific communication needs while using MQTT protocol for device connectivity.

The typical structure for a topic in MQTT configurations used in Zoho IoT is :

device/<device_id>/<publish_subscribe_topic>

To ensure proper configuration, it is highly recommended to use the topic as it is from the connection details page provided within the Zoho IoT application.

Each registered MQTT device in Zoho IoT has a dedicated topic to transmit its data. Here's a brief explanation of how these topics function:

Publish Topics

<device>/<device_id>/telemetry: This topic is for sending device payload information to the application. Data points are extracted from messages sent through this telemetry topic.

<device>/<device_id>/events: This topics used for transmitting event-related information like alarm notifications.

<device>/<device_id>/commands/ack : This topics is utilized for sending command receipt acknowledgment back to the application.

Subscribe Topics

<device>/<device_id>/command: This topic facilitates the delivery of commands from the Zoho IoT application to the device.

Note: Zoho IoT does not support custom topics. Using an unrecognized topic will disconnect the device from the server.

QoS1

Zoho IoT currently supports only QoS 1 (Quality of Service level 1) for MQTT, which guarantees that messages are delivered at least once by requiring an acknowledgment from the receiver.

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