#include "Timer.h"           // Side project
#include <SoftwareSerial.h>
// D2 == RX
// D3 == TX
// D4 == RST
#define RX 2
#define TX 3
#define RST 4
SoftwareSerial SIM8001(TX, RX);

Timer t;                      // Side project
const byte ledPin = 13;       // Side project
const byte interruptPin = A7; // Side project, including because "what if"
int val = 0;
volatile byte state = LOW;

void setup() {
  pinMode(ledPin, OUTPUT);    // Side project
  pinMode(RST, OUTPUT);
  digitalWrite(RST, HIGH);

  Serial.begin(4800);
  SIM8001.begin(4800);
}

void loop() {
  while (SIM8001.available()) {
    Serial.write(SIM8001.read());
  }
  while (Serial.available()) {
    digitalWrite(ledPin, HIGH); // Status check, if we're in this block or not.
    SIM8001.write(Serial.read());
    digitalWrite(ledPin, LOW);  // And a flash confirms that this block occurred.
  }
}