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#include <SoftwareSerial.h>
SoftwareSerial SIM900A(2,3); // RX | TX
// Connect the SIM900A TX to Arduino pin 2 RX. 
// Connect the SIM900A RX to Arduino pin 3 TX. 
char c = ' ';
void setup() 
{
    // start th serial communication with the host computer
    Serial.begin(9600);
    while(!Serial);
    Serial.println("Arduino with SIM900A is ready");
 
    // start communication with the SIM900A in 9600
    SIM900A.begin(9600);  
    Serial.println("SIM900A started at 9600");
    delay(1000);
    Serial.println("Setup Complete! SIM900A is Ready!");
}
 
void loop()
{
 
     // Keep reading from SIM800 and send to Arduino Serial Monitor
    if (SIM900A.available())
    { c = SIM900A.read();
      Serial.write(c);}
 
    // Keep reading from Arduino Serial Monitor and send to SIM900A
    if (Serial.available())
    { c = Serial.read();
      SIM900A.write(c);  
       }

}

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#include <SoftwareSerial.h>

SoftwareSerial SIM900A(2,3);

void setup()
{
  SIM900A.begin(9600);   // Setting the baud rate of GSM Module  
  Serial.begin(9600);    // Setting the baud rate of Serial Monitor (Arduino)
  Serial.println ("SIM900A Ready");
  delay(100);
  Serial.println (" Ketik 's' untuk Mengirim SMS dan 'r' untuk Membaca SMS masuk");
}


void loop()
{
  if (Serial.available()>0)
   switch(Serial.read())
  {
    case 's':
      SendMessage();
      break;
    case 'r':
      RecieveMessage();
      break;
  }

 if (SIM900A.available()>0)
   Serial.write(SIM900A.read());
}


 void SendMessage()
{
  Serial.println ("SIM900A Mengirim SMS");
  SIM900A.println("AT+CMGF=1");    //Sets the GSM Module in Text Mode
  delay(1000);  // Delay of 1000 milli seconds or 1 second
  Serial.println ("Set SMS Number");
  SIM900A.println("AT+CMGS=\"+6289666699910\"\r"); // Replace with your mobile number
  delay(1000);
  Serial.println ("Set SMS Content");
  SIM900A.println("Hello, I am SIM900A GSM Module");// The SMS text you want to send
  delay(100);
  Serial.println ("Finish");
  SIM900A.println((char)26);// ASCII code of CTRL+Z
  delay(1000);
  Serial.println (" ->SMS Selesai dikirim");
}


 void RecieveMessage()
{
  Serial.println ("SIM900A Membaca SMS");
  delay (1000);
  SIM900A.println("AT+CNMI=2,2,0,0,0"); // AT Command to receive a live SMS
  delay(1000);
  Serial.write (" ->Unread SMS Selesai dibaca");
 }
 

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#include "SIM900.h"
#include <SoftwareSerial.h>

int numdata;
char inSerial[40];
int i=0;


void setup()
{
     //Serial connection.
     Serial.begin(9600);
     Serial.println("GSM Shield testing.");
     //Start configuration of shield with baudrate.
     //For http uses is raccomanded to use 4800 or slower.
     if (gsm.begin(9600))
          Serial.println("\nstatus=READY");
     else Serial.println("\nstatus=IDLE");
};

void loop()
{
     //Read for new byte on serial hardware,
     //and write them on NewSoftSerial.
     serialhwread();
     //Read for new byte on NewSoftSerial.
     serialswread();
};

void serialhwread()
{
     i=0;
     if (Serial.available() > 0) {
          while (Serial.available() > 0) {
               inSerial[i]=(Serial.read());
               delay(10);
               i++;
          }

          inSerial[i]='\0';
          if(!strcmp(inSerial,"/END")) {
               Serial.println("_");
               inSerial[0]=0x1a;
               inSerial[1]='\0';
               gsm.SimpleWriteln(inSerial);
          }
          //Send a saved AT command using serial port.
          if(!strcmp(inSerial,"TEST")) {
               Serial.println("SIGNAL QUALITY");
               gsm.SimpleWriteln("AT+CSQ");
          } else {
               Serial.println(inSerial);
               gsm.SimpleWriteln(inSerial);
          }
          inSerial[0]='\0';
     }
}

void serialswread()
{
     gsm.SimpleRead();
}