How to send text to ESP8266 over wifi

how to send text to ESP8266 over wifi by using the IP address

Hello mgsay41

Take a view into the IDE. There you will find alot of examples.

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Lots of advice here: Link to a very basic tutorial about TCP (evolved to: TCP-socket democode to send / receive data / characters similar to serial

Something like:
ESP8266 Sending Data Over Wi-Fi to another ESP8266 – Robot Zero One

Voice to:
GitHub - PetteriAimonen/esp-walkie-talkie: Software for a ESP8266 based walkie talkie radio (doesn't work very well)

Way more:
150+ ESP8266 NodeMCU Projects, Tutorials and Guides with Arduino IDE​ | Random Nerd Tutorials

what is the text comming from? e.g. another ESP8266, a local PC, a smartphone, a remote cloud based system, etc etc

its a mobile app or a website

how often is the text sent? could you send an email?
is the sender a person, e.g. could type text into a web based form, or a program running on a remote system

Easiest way to control ESP8266 from a smartphone - Using Arduino / Microcontrollers - Arduino Forum

That RobotZeroOne article is a keeper (bookmarking that).

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