# MQTT, Complete and Catch questions

**URL:** <https://discourse.nodered.org/t/mqtt-complete-and-catch-questions/44312>\
**Category:** General\
**Created:** [17 April 2021 08:03 UTC](https://discourse.nodered.org/t/mqtt-complete-and-catch-questions/44312 "2021-04-17T08:03:43Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Colin](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/colin/32/17040_2.png) [@Colin](https://discourse.nodered.org/u/Colin)\
**Post date:** [17 April 2021 08:03 UTC](https://discourse.nodered.org/t/mqtt-complete-and-catch-questions/44312/1 "2021-04-17T08:03:44Z")

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I see that the MQTT Out node correctly generates an event that can be caught by a Complete node when it has sent the message to the broker, but it does not appear to generate an error that the Catch node can catch if I send a message while the broker is disconnected. Is this a bug or just a feature that has not been implemented? If it is a missing feature are there technical issues that make it difficult or impossible to implement?

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**Author:** ![TotallyInformation](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/totallyinformation/32/31_2.png) [@TotallyInformation](https://discourse.nodered.org/u/TotallyInformation)\
**Post date:** [17 April 2021 13:42 UTC](https://discourse.nodered.org/t/mqtt-complete-and-catch-questions/44312/2 "2021-04-17T13:42:20Z")

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I think that you can catch if the broker isn't connected can't you? That would be more robust anyway.

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**Author:** ![Colin](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/colin/32/17040_2.png) [@Colin](https://discourse.nodered.org/u/Colin)\
**Post date:** [17 April 2021 14:39 UTC](https://discourse.nodered.org/t/mqtt-complete-and-catch-questions/44312/3 "2021-04-17T14:39:28Z")

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The status changes, but I haven't been able to work out how to know that a particular message has not got through. A Catch node doesn't catch anything.

This is in contrast to the email out node. When you pass it an message to send it always either signals a Complete or a Catch event.

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**Author:** ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)\
**Post date:** [16 June 2021 14:40 UTC](https://discourse.nodered.org/t/mqtt-complete-and-catch-questions/44312/4 "2021-06-16T14:40:28Z")

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