I want to send data from my website to SIM900

Hardware Arduino GSM Shield
1

Hello Everyone,

I am quite new with working with electronics generally and I gave it my first short with Arduino Uno R3 and a SIM900 GPRS/GSM Shield.

I have been able to send and receive sms and make phone calls. I know a little about web design so I have been able to send HTTP request to a web server, and most of the resources I used was from this forum. Thank you so much guys for the repository of knowledge you have ongoing here.

I want to be able to send data to the GSM shield through the website to make a phone call. Presently I am using the Arduino's and SIM900 Shields to send Information to the website.

I have searched online for information but I have not gotten anything reasonable. I want to have 4 Arduino Uno and SIM900 shields interact with the website and receive data from the website. Which method or device do you think is feasible for a job like this and what are the required steps.

Please I need your assistance.

Thanks for your concern.

2

This is the primary task I have set for this my little project and this is how far I have gone..
I want a standalone processor that can do the following:

  1. Receive SMS ---------- SOLVED
  2. Read the SMS as in get, sender number, message content and timestamp -----UNRESOLVED
    3a. Send the SMS to a database on my website -------------- SOLVED
    3b. Delete SMS from the SIM card -------------- UNRESOLVED
  3. Use the SMS for operation on my website ------------------ SOLVED
  4. Send data to Arduino/SIM900 to make a phone call based on the operation in 4 above. -------------UNRESOLVED

The ones marked SOLVED has been completely resolved, but the ones not completely resolved is remarked UNRESOLVED. This is what I am trying to achieve and I need it to be automated. I will like to know if I am using the right approach and device. Your assistance will be highly appreciated.

Thank you for your time and concern.

3

I have been able to receive SMS using the following code

#include <SoftwareSerial.h>
SoftwareSerial GSM(2, 3); // RX, TX

String d;
int i=0;
void setup()
{
  Serial.begin(19200); 
  GSM.begin(2400);
  GSM.println("AT \r");
  delay(500);                  
 GSM.println("AT+CMGF=1 \r");    
  delay(1000);
  GSM.println("AT+CNMI=1,2,0,0 \r");
  delay(2000);
 
}

void loop()
{
  while ( !GSM.available() ); 
    d = GSM.readString(); 
    Serial.println(d);
    delay(2000); 
   
            
}

AT

OK

AT+CMGF=1

OK

AT+CNMI=1,2,0,0
OK

+CMT: "+23470357XXXXX","","2017/10/10","10:12:40+23"
Hello Message to SIM900

Please i will like to store the sender number, timestamp and message into variables.
Any clue on how to do this will be highly appreciated.
Thanks.

4

You need to parse the incoming data. There are several tutorials around showing you how to acomplish this.

5

I have been able to find a parse and I got help from Nikhil Joji.

#include <SoftwareSerial.h>
SoftwareSerial GSM(2, 3); // RX, TX

String d;
int i=0;
void setup()
{
  Serial.begin(19200); 
  GSM.begin(19200);
  GSM.println("AT \r");
  delay(500);                  
 GSM.println("AT+CMGF=1 \r");    
  delay(1000);
  GSM.println("AT+CNMI=1,2,0,0 \r");
  delay(2000);
 
}
void loop()
{
  while ( !GSM.available() ); 
    d = GSM.readString(); 
    Serial.println(d);
    delay(2000); 
    int indexOne = d.indexOf('"');       //position of "
    Serial.print("IndexOne is ");     //printing the position number
    Serial.println(indexOne);
    
    String sender_number = d.substring(indexOne,indexOne+16);
    Serial.println("Sender number is ");    //Printing
    Serial.println(sender_number);

    //int indexTwo = d.substring('","","');
    String send_date = d.substring(indexOne+21,indexOne+41);
    Serial.println("Send date is ");    //Printing
    Serial.println(send_date);

   // int indexThree = d.indexOf('\n');
    String msg = d.substring(indexOne+41,indexOne+250);
    Serial.println("Message is ");    //Printing
    Serial.println(msg);
    
          
}


}

The out put is

AT

OK
AT+CMGF=1

OK
AT+CNMI=1,2,0,0

OK

IndexOne is -1
Sender number is
CMGF=1

OK
AT+CNMI=1,2,0,0

OK

Send date is
1

OK
AT+CNMI=1
Message is
,2,0,0

OK

+CMT: "+234703XXXXXXX","","17/10/15,20:52:32+04"
No wahala bro,i got ya..we neva even stat so i'm tryng to revise ahead of d time. Stil on ctrl bro!

IndexOne is 8
Sender number is
"+234703XXXXXXX"
Send date is
17/10/15,20:52:32+04
Message is
"
No wahala bro,i got ya..we neva even stat so i'm tryng to revise ahead of d time. Stil on ctrl bro!

I have been able to break it down into variables but I am having problem paring the variables to to a database using HTTP GET request.

I have tried using sendGSM("AT+HTTPPARA=\"URL\",\"kiopay.net/webservice/data.php?network_id=5&senderNo=234703XXXXXXX&recMsg=Hello+World&timeArrived=201710112134\"");
It works my data is passed to the database but I want to use the variables which I have gotten from the sms. when I used the variable names I get the identifier instead of the value.

Please your help will be highly appreciated..
Thannks .

6

Please I am actually having the same issue as you and I am in Ghana with exactly the same shield as you can you help me out.
I can't send and receive messages