拆个炸弹还要先过马路《炸弹猎人》近期将上架
Problem
百度 在本次行活动中，江铃汽车股份有限公司提供了6辆刚刚下线的福特2013款新世代全顺作为活动工作车和媒体车。You want to set the topic of a published MQTT message dynamically.
Solution
Set the topic message property, before sending the message to an MQTT Output node.
Example
[{"id":"73abc692.bb3838","type":"mqtt out","z":"eda2a949.74ea98","name":"","topic":"","qos":"","retain":"","broker":"61de5090.0f5d9","x":410,"y":300,"wires":[]},{"id":"ef5a01ee.a940d","type":"inject","z":"eda2a949.74ea98","name":"kitchen temperature","topic":"sensors/kitchen/temperature","payload":"22","payloadType":"num","repeat":"","crontab":"","once":false,"x":250,"y":300,"wires":[["73abc692.bb3838"]]},{"id":"61de5090.0f5d9","type":"mqtt-broker","z":"","broker":"localhost","port":"1883","clientid":"","usetls":false,"compatmode":true,"keepalive":"60","cleansession":true,"willTopic":"","willQos":"0","willPayload":"","birthTopic":"","birthQos":"0","birthPayload":""}]
In this example, the Inject node sets the msg.topic,
but you don’t always need to use an inject node to do this.
Discussion
Ensure the Topic field in the MQTT Output configuration dialog is left blank to use the topic message property.
