softwareserial between arduino uno and esp8266
Make sure that:


RX pin on the Arduino UNO is connected to the TX pin on the ESP8266.
TX pin on the Arduino UNO is connected to the RX pin on the ESP8266.
Baud rate should be set to the same value from both the Arduino and ESP8266.


I don't know about your arduino but looking at this schematic, your RX and TX should be swapped.