How to organize receiving and sending data in Arduino?

Question

Arduino

Hello everyone. I decided to play around with the arduino and relays.
What is: 1) Rasberry Pi3
+debian-server+nodejs
2) Vanilla Uno (clone of arduino) + esp8266MOD (Ampere Troyka-module AMP-B081)
3) a pair of relay shields at the moment: manage the relays connected to the arduino and set up a network between the ardino locale, but I can’t figure out how to send a command to the arduino so that it turns on or off the relay via the local network

Answer 1

There are two ways:

1. Give up arduino and learn how to flash ESP8266, it has a lot of pins for controlling including relays. In particular, there are a lot of firmware on the Internet with examples of organizing a web server, implementing MQTT, etc. This will be the ESP8266 pin remote control mechanism.
   
2. Leave it as it is now and study the ESP8266 AT command manual to implement a simplified analog of a web server on the Arduino itself. There are plenty of examples on the internet on how to do this.