# Need to Trigger a node when MQTT message is sent

**URL:** <https://discourse.nodered.org/t/need-to-trigger-a-node-when-mqtt-message-is-sent/84091>\
**Category:** General\
**Tags:** mqtt\
**Created:** [28 December 2023 16:51 UTC](https://discourse.nodered.org/t/need-to-trigger-a-node-when-mqtt-message-is-sent/84091 "2023-12-28T16:51:54Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![makerstorage](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/makerstorage/32/57594_2.png) [@makerstorage](https://discourse.nodered.org/u/makerstorage)\
**Post date:** [28 December 2023 16:51 UTC](https://discourse.nodered.org/t/need-to-trigger-a-node-when-mqtt-message-is-sent/84091/1 "2023-12-28T16:51:54Z")

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Hi,

As you know, the MQTT out node does not have an output.  
I want to trigger a node when the MQTT message is sent successfully.  
Do you have any ideas on how to do that?

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**Author:** ![jbudd](https://avatars.discourse-cdn.com/v4/letter/j/5f8ce5/32.png) [@jbudd](https://discourse.nodered.org/u/jbudd)\
**Post date:** [28 December 2023 16:56 UTC](https://discourse.nodered.org/t/need-to-trigger-a-node-when-mqtt-message-is-sent/84091/2 "2023-12-28T16:56:06Z")

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You could use an mqtt-in node to subscribe to the same topic.

 ![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/5/2/5279927dc85d66befbb4cf3cb3ea44ee2a07a162.png)

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<div class="post-metadata">

**Author:** ![E1cid](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/e1cid/32/77971_2.png) [@E1cid](https://discourse.nodered.org/u/E1cid)\
**Post date:** [28 December 2023 18:21 UTC](https://discourse.nodered.org/t/need-to-trigger-a-node-when-mqtt-message-is-sent/84091/3 "2023-12-28T18:21:28Z")

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You can also use the complete node.  
e.g.

```auto
[{"id":"2b77d071ec69d1d9","type":"complete","z":"d1395164b4eec73e","name":"","scope":["7f66a6f0d5c7e66d"],"uncaught":false,"x":190,"y":2220,"wires":[["2008a35b441a7cf0"]]},{"id":"fe5f8b5b5e23d287","type":"inject","z":"d1395164b4eec73e","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"","payloadType":"date","x":180,"y":2180,"wires":[["7f66a6f0d5c7e66d","24c2943ed1a1bc3c"]]},{"id":"7f66a6f0d5c7e66d","type":"mqtt out","z":"d1395164b4eec73e","name":"","topic":"test/test1","qos":"","retain":"","respTopic":"","contentType":"","userProps":"","correl":"","expiry":"","broker":"e8ba3ef5.22f4a8","x":400,"y":2180,"wires":[]},{"id":"24c2943ed1a1bc3c","type":"debug","z":"d1395164b4eec73e","name":"debug 2462","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"true","targetType":"full","statusVal":"","statusType":"auto","x":370,"y":2140,"wires":[]},{"id":"2008a35b441a7cf0","type":"debug","z":"d1395164b4eec73e","name":"debug 2461","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"true","targetType":"full","statusVal":"","statusType":"auto","x":370,"y":2220,"wires":[]},{"id":"e8ba3ef5.22f4a8","type":"mqtt-broker","name":"testb","broker":"192.168.1.25","port":"1883","clientid":"","autoConnect":true,"usetls":false,"compatmode":false,"protocolVersion":"4","keepalive":"60","cleansession":true,"birthTopic":"","birthQos":"0","birthRetain":"false","birthPayload":"","birthMsg":{},"closeTopic":"","closeQos":"0","closePayload":"","closeMsg":{},"willTopic":"","willQos":"0","willPayload":"","willMsg":{},"userProps":"","sessionExpiry":""}]

```

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<div class="post-metadata">

**Author:** ![makerstorage](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/makerstorage/32/57594_2.png) [@makerstorage](https://discourse.nodered.org/u/makerstorage)\
**Post date:** [29 December 2023 05:38 UTC](https://discourse.nodered.org/t/need-to-trigger-a-node-when-mqtt-message-is-sent/84091/4 "2023-12-29T05:38:09Z")

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Thanks for the answer

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)\
**Post date:** [27 February 2024 05:39 UTC](https://discourse.nodered.org/t/need-to-trigger-a-node-when-mqtt-message-is-sent/84091/5 "2024-02-27T05:39:05Z")

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