Photon To MCU Comms

This is an odd project in its self. I need to be able to display by UART signal of a Blynk App user input over WiFi to the Photon. The photon then will take this user input and send it via UART. Simply I only need to find a way to call the Photon to display a UART comms to a terminal for simple example based on Blynk button user input. Any help is welcomed, thanks!