Hi,
I started a project to put an old intercom to home assistant!
The components used are cheap ad simple to integrate.
This is the github repository
I hope it will be of help to someone.
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How do you connect power to ESP8266 Module? I think there is some(powering and CA, 9 pins in Urmet) mistakes into your circuit. Is it working for you?
The ESP8266 is powerd by an external power adapter (through microusb).