SIM808_Tester

#include <SoftwareSerial.h>
SoftwareSerial SIM808(7, 8);
void setup()
{
  pinMode(9, OUTPUT);
  SIM808.begin(9600);   // Setting the baud rate of GSM Module
  Serial.begin(9600);    // Setting the baud rate of Serial Monitor (Arduino)
  Serial.println ("SIM808 Ready");
  digitalWrite(9,1);
  delay(100);
  Serial.println ("Type s to send message or r to receive message");
  delay(15000);
  SendMessage();
}
void loop()
{

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

  if (SIM808.available() > 0)
    Serial.write(SIM808.read());

}
void SendMessage()
{
  Serial.println ("Sending Message");
  SIM808.println("AT+CMGF=1");    //Sets the GSM Module in Text Mode
  delay(1000);
  Serial.println ("Set SMS Number");
  //                            *********
  SIM808.println("AT+CMGS=\"+966554433221\"\r"); //Mobile phone number to send message
  delay(1000);
  Serial.println ("Set SMS Content");
  SIM808.println("NEW 09-05-2023 - Good 123?");// Messsage content
  delay(100);
  Serial.println ("Finish");
  SIM808.println((char)26);// ASCII code of CTRL+Z
  delay(1000);
  Serial.println ("Message has been sent ->SMS Selesai dikirim");
}