ESP8266 LCD16x2 Yealink Phone URL Action feature
Visual indicator that I’m on the phone. The Yealink phone pushes a GET REQUEST to the esp8266 to say that I’m on the on phone. aka “phone off the hook”.
The esp8266 just turns on and off the display to say “SORRY, BUSY! I’M ON THE PHONE”.
This gives my wife a visual clue that I cant responded to her shouting at me when I’m on the phone.