I am Using Sim800L with Arduino UNO. While Running time, It Receive message, Call function and Send message. It works fine, But in Sending message, message is sent and not displayed in mobile phone(i.e. It Shows received message from the sim800l number notifications, but message is not viewed in message APK and not able read the message. )
I hereby Attach my code..
#include <SoftwareSerial.h>
SoftwareSerial sim(2, 3);
int _timeout;
String _buffer;
String number = "+91xxxxxxxxxx"; //-> change with your number
void setup() {
delay(7000); //delay for 7 seconds to make sure the modules get the signal
Serial.begin(9600);
_buffer.reserve(50);
Serial.println("Sistem Started...");
sim.begin(9600);
delay(1000);
Serial.println("Type s to send an SMS, r to receive an SMS, and c to make a call");
}
void loop() {
/*
Serial.println("Are you want to change the Number >> YES or NO");
if(Serial.read()== "YES"){
Serial.println("Enter the Number >> ");
number = Serial.read();
}*/
if (Serial.available() > 0)
switch (Serial.read())
{
case 's':
SendMessage();
break;
case 'r':
RecieveMessage();
break;
case 'c':
callNumber();
break;
}
if (sim.available() > 0)
Serial.write(sim.read());
}
void SendMessage()
{
//Serial.println ("Sending Message");
sim.println("AT+CMGF=1"); //Sets the GSM Module in Text Mode
delay(1000);
//Serial.println ("Set SMS Number");
sim.println("AT+CMGS=\"" + number + "\"\r"); //Mobile phone number to send message
delay(1000);
String SMS = "Hello, how are you?";
sim.println(SMS);
delay(100);
sim.println((char)26);// ASCII code of CTRL+Z
delay(1000);
_buffer = _readSerial();
}
void RecieveMessage()
{
Serial.println ("SIM800L Read an SMS");
delay (1000);
sim.println("AT+CNMI=2,2,0,0,0"); // AT Command to receive a live SMS
delay(1000);
Serial.write ("Unread Message done");
}
String _readSerial() {
_timeout = 0;
while (!sim.available() && _timeout < 12000 )
{
delay(13);
_timeout++;
}
if (sim.available()) {
return sim.readString();
}
}
void callNumber() {
sim.print (F("ATD"));
sim.print (number);
sim.print (F(";\r\n"));
_buffer = _readSerial();
Serial.println(_buffer);
}
