# How to watch a Payload - Response when change

**URL:** <https://discourse.nodered.org/t/how-to-watch-a-payload-response-when-change/25950>\
**Category:** General\
**Created:** [2 May 2020 19:38 UTC](https://discourse.nodered.org/t/how-to-watch-a-payload-response-when-change/25950 "2020-05-02T19:38:10Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Flixm](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/flixm/32/17122_2.png) [@Flixm](https://discourse.nodered.org/u/Flixm)\
**Post date:** [2 May 2020 19:38 UTC](https://discourse.nodered.org/t/how-to-watch-a-payload-response-when-change/25950/1 "2020-05-02T19:38:10Z")

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Hi there,  
i'd like to get a response when a payload change to another (not known).

In my case i´d like to send me a pushover Message when i get a new public IP adress ... is there a node to watch if there something change and send a "alert" message ?  
Actually i can read my public IPV4 adress, but i want to get a second output if something change.

Thanks in advance

Felix

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**Author:** ![edje11](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/edje11/32/572_2.png) [@edje11](https://discourse.nodered.org/u/edje11)\
**Post date:** [2 May 2020 19:46 UTC](https://discourse.nodered.org/t/how-to-watch-a-payload-response-when-change/25950/2 "2020-05-02T19:46:06Z")

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Have a look at the RBE node, it will pass the message when it's changed.

> **[node-red-node-rbe](https://flows.nodered.org/node/node-red-node-rbe)**
>
> A Node-RED node that provides report-by-exception (RBE) and deadband capabilities.

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<div class="post-metadata">

**Author:** ![Flixm](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/flixm/32/17122_2.png) [@Flixm](https://discourse.nodered.org/u/Flixm)\
**Post date:** [2 May 2020 19:54 UTC](https://discourse.nodered.org/t/how-to-watch-a-payload-response-when-change/25950/3 "2020-05-02T19:54:59Z")

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Of course, i took a look at it but i was blind to see the solution. thx

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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 May 2020 19:55 UTC](https://discourse.nodered.org/t/how-to-watch-a-payload-response-when-change/25950/4 "2020-05-16T19:55:03Z")

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