ESP8266 Community Forum

looking a way to build a doorbell for my shed. i was thinking to have a batteries operated nodemcu esp8266 with a button on the the entrance door, connect to my network and then a 2nd nodemcu with a buzzer (?) start playing a chime. At the same time send a Telegram message that somebody is on my front door (in case that i am away). So it will be like this
-nodemcu (A) with button at the door
-wifi coverage
-nodemcu (B) with the chime and telegram info.

i have found the guide on how to make the info arrive to Telegram like in https://randomnerdtutorials.com/esp8266 ... -telegram/
but i have no idea how to make the nodemcu A send to nodemcu B the info and play a chime.

Any guides please?

I use MQTT, however you do need an MQTT server (mine runs on a Pi). 'A' updates an MQTT topic when the doorbell rings and you can also set a 'Last Will' message so if 'A' fails (e.g battery goes flat) you can be notified. 'B' subscribes to the topic and takes suitable action when notified via MQTT.

You do not need the complexity of running a MQTT server.

You can use UDP messages for Communication between two ESP8266s