MQTT Publish service
The MQTT component will register the service mqtt.publish which allows publishing messages to MQTT topics. There are two ways of specifying your payload. You can either use payload to hard-code a payload or use payload_template to specify a template that will be rendered to generate the payload.
Service mqtt.publish
| Service data attribute | Optional | Description |
|---|---|---|
topic |
no | Topic to publish payload to. |
payload |
yes | Payload to publish. |
payload_template |
yes | Template to render as payload value. Ignored if payload given. |
qos |
yes | Quality of Service to use. |
retain |
yes | If message should have the retain flag set. (default: false) |
You need to include either payload or payload_template, but not both.
{
"topic": "home-assistant/light/1/command",
"payload": "on"
}
{
"topic": "home-assistant/light/1/state",
"payload_template": "{{ states('device_tracker.paulus') }}"
}
payload must be a string. If you want to send JSON then you need to format/escape it properly. Like:
{
"topic": "home-assistant/light/1/state",
"payload":"{\"Status\":\"off\", \"Data\":\"something\"}"
}
Example of how to use qos and retain:
{
"topic": "home-assistant/light/1/command",
"payload": "on",
"qos": 2,
"retain": true
}