// SerialIn_SerialOut_004
//
// Uses hardware serial to talk to the host computer and Software
// Serial for communication with the bluetooth module
//
// What ever is entered in the serial monitor is sent to the connected
// device
// Anything received from the connected device is copied to the serial
// monitor
//
// Pins
// BT VCC to Arduino 5V out.
// BT GND to GND
// Arduino D8 (SS RX) - BT TX no need voltage divider
// Arduino D9 (SS TX) - BT RX through a voltage divider (5v to 3.3v)
//
// Setup procedure
/*
 * AT
 * AT+ORGL
 * // restart
 * AT
 * AT+NAME=Meeting Clock
 * AT+NAME?
 * AT+PSWD="1812"
 * AT+PSWD?
 * AT+UART=9600,1,0
 * AT+UART?
 */

#include <SoftwareSerial.h>
SoftwareSerial BTserial(5, 4); // RX, TX
#define STATE_PIN 3

char c = ' ';
boolean NL = true;

void setup()
{
  Serial.begin(9600);
  Serial.print("Sketch:   ");   Serial.println(__FILE__);
  Serial.print("Uploaded: ");   Serial.println(__DATE__);
  Serial.println(" ");

  BTserial.begin(38400); // for at mode
  //BTserial.begin(9600); // for echo mode
  Serial.println("BTserial started at 9600");
  Serial.println(" ");

  pinMode(STATE_PIN, INPUT);
}

bool state = false;
void loop()
{
  if (digitalRead(STATE_PIN) != state) {
    state = digitalRead(STATE_PIN);
    Serial.print("! new BT state: ");
    if (state) {
      Serial.println("Connected");
    } else {
      Serial.println("Disconnected");
    }
  }
  
  // Read from the Bluetooth module and send to the Arduino Serial
  // Monitor
  if (BTserial.available())
  {
    c = BTserial.read();         Serial.write(c);
  }


  // Read from the Serial Monitor and send to the Bluetooth module
  if (Serial.available())
  {
    c = Serial.read();
    BTserial.write(c);

    // Echo the user input to the main window. The ">" character
    // indicates the user entered text.
    if (NL) {
      Serial.print(">");
      NL = false;
    }
    Serial.write(c);
    if (c == 10) {
      NL = true;
    }
  }
}