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README.md

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 # How it Works
 If the mailbox opens the ESP wakes up from deep-sleep, connects to Wifi and the MQTT-server and sents out a MQTT message, which is then processed by Node-Red. Node-Red however "converts" it into a Matrix message, which is then posted to my phone via a Matrix-Chatbot.
 ## You Can find the Instructions how to create the Chatbot in the [node-red-Folder](node-red/README.md).