Getting error while trying to publish a tag value to mqtt broker

Adjust the JSON payload to match the expected format as described as below

Write formatting To perform a write, the data needs to be in the following format:

[{"id": "Channel1.Device1.Tag1","v": 42},{"id": "Channel1.Device1.Tag2","v": 523}]

The “Channel1.Device1.Tag1” should be replaced by the tag to be written and “42” by the value to be written.

The example above shows a JSON array that should update both Tag1 and Tag2 when parsed by the MQTT agent.

Using Mosquitto_sub.exe to update Tag1 from a DOScommand line would look like: mosquitto_pub.exe -t iotgateway/write -m "[{\"id\": \"Channel1.Device1.Tag1\",\"v\": 42}]"

Note

The MQTT agent checks the topic specified for JSON data in the proper format. Once the agent parses the data, it attempts to write the value to the specified tag.

Only tags that have been added to the MQTT agent may be written.