XC4411 Serial.read Serial.write comands

Using the XC4411 board (Uno+WiFi) I have got the ESP8266 coded and connected to an AP and transmitting text (from ESP8266 code), I have also sketched in the ATmega code to run sensors,
My question is how do I have the ESP8266 transmit the data from the ATmega using the Serial.read, Serial.write commands

@bumcraic, your topic has been moved to a more suitable location on the forum. Introductory Tutorials is for tutorials that e.g. you write, not for questions. Feel free to write a tutorial once you have solved your problem :wink: