#include <SoftwareSerial.h>

//SIM800 TX is connected to Arduino
#define SIM800_TX_PIN 10
#define SIM800_RX_PIN 11

SoftwareSerial serialSIM800(SIM800_TX_PIN, SIM800_RX_PIN);



void setup() {
  Serial.println("SIM800 AT commander");

  //Begin serial comunication with Arduino and Arduino IDE (Serial Monitor)
  Serial.begin(9600);
  while (!Serial);

  //Being serial communication witj Arduino and SIM800
  serialSIM800.begin(9600);
  delay(1000);

  pinMode(10, OUTPUT);
  digitalWrite(10, HIGH);
  Serial.print("Fet on");
}

// --LOOP--
void loop() {

  //Read SIM800 output (if available) and print it in Arduino IDE Serial Monitor
  if (serialSIM800.available()) {
    Serial.write(serialSIM800.read());
  }
  //Read Arduino IDE Serial Monitor inputs (if available) and send them to SIM800
  if (Serial.available()) {
    serialSIM800.write(Serial.read());
  }

}