# Why Coap Server resend message twice?

**URL:** <https://discourse.nodered.org/t/why-coap-server-resend-message-twice/60724>\
**Category:** General\
**Tags:** function-node\
**Created:** [3 April 2022 14:45 UTC](https://discourse.nodered.org/t/why-coap-server-resend-message-twice/60724 "2022-04-03T14:45:48Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Salarj](https://avatars.discourse-cdn.com/v4/letter/s/f08c70/32.png) [@Salarj](https://discourse.nodered.org/u/Salarj)\
**Post date:** [3 April 2022 14:45 UTC](https://discourse.nodered.org/t/why-coap-server-resend-message-twice/60724/1 "2022-04-03T14:45:48Z")

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Hi Dear  
I am working on CoAP in a Node-Red application. In my scenario, the client sends a single request to the CoAP Server every one second . Why do I always receive two responses from the CoAP Server (for each request?) how to make it one response?  
**note** :  
i am using function node in the server with this code:  
msg.res.end("50")  
return msg;

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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:** [2 June 2022 14:46 UTC](https://discourse.nodered.org/t/why-coap-server-resend-message-twice/60724/2 "2022-06-02T14:46:40Z")

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