#include <SoftwareSerial.h>

SoftwareSerial esp(2, 3); // RX, TX

void setup() {
  Serial.begin(9600);
  esp.begin(115200);
  
  delay(1000);
  esp.println("AT");
  delay(1000);
  esp.println("AT+CWMODE=1");
  delay(1000);
  esp.println("AT+CWJAP=\"SSID\",\"PASSWORD\"");
  delay(5000);
}

void loop() {
  if (esp.available()) {
    Serial.write(esp.read());
  }
  
  if (Serial.available()) {
    esp.write(Serial.read());
  }
}