# \[Tutoriel 4\] Création basique d’une interface Node-Red

**URL:** <https://community.homey.app/t/tutoriel-4-creation-basique-d-une-interface-node-red/31549>\
**Category:** Questions & Aide\
**Created:** [June 22, 2020, 4:55pm UTC](https://community.homey.app/t/tutoriel-4-creation-basique-d-une-interface-node-red/31549 "2020-06-22T16:55:18Z")\
**Posts on this page:** 1\
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**Author:** ![Shadow](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/shadow/32/23280_2.png) [@Shadow](https://community.homey.app/u/Shadow)\
**Post date:** [June 25, 2020, 8:23pm UTC](https://community.homey.app/t/tutoriel-4-creation-basique-d-une-interface-node-red/31549/10 "2020-06-25T20:23:56Z")

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Que ce que je fait faut si le MQTT IN ne se connecte pas?

J’ai tout fait comme tu l’as décrit.

Voila le message a droite dans le debug:  
25/06/2020 à 22:23:09  
msg : string[567]  
“↵↵---------------------------------------------------------------------↵Your flow credentials file is encrypted using a system-generated key.↵↵If the system-generated key is lost for any reason, your credentials↵file will not be recoverable, you will have to delete it and re-enter↵your credentials.↵↵You should set your own key using the ‘credentialSecret’ option in↵your settings file. Node-RED will then re-encrypt your credentials↵file using your chosen key the next time you deploy a change.↵---------------------------------------------------------------------↵”

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