Read a text file from server and save the value in a variable

Projects Programming
1

Hi guys!

I have an arduino UNO with a GSM shield and I have already manage to send data from my sensor to my web server.
The problem is that now, I would like to do the opposite procedure. I mean, change a value from the server, send it to a text file (already done), read this number with my Arduino and store it in a variable 'int' or 'long' (here is the problem).

I found the following code for a string, but it doesn't work either when I change the number into a word in my .txt.

Any idea?

Thanks in advanced.

    // libraries
   #include <GSM.h>

   // PIN Number
   #define PINNUMBER ""

   // APN data
   #define GPRS_APN "" // APN del operador de la tarjeta.
   #define GPRS_LOGIN "" // GPRS login. Vacío si no existe.
   #define GPRS_PASSWORD "" // GPRS password. Vacío si no existe.

   // initialize the library instance
   GSMClient client;
   GPRS gprs;
   GSM gsmAccess; 
   
   //Variables Declaration
   char k[30];
   char z = '*';
   int s=0;
   String place;

   // URL, path & port (for example: arduino.cc)

   char server[] = "";
   char path[] = "";
   int port = 80; // port 80 is the default for HTTP


   void setup()
   {
    // initialize serial communications and wait for port to open:
    Serial.begin(9600);
   Serial.println("SMS connected");

    // connection state
    boolean notConnected = true;

    while(notConnected)
      {
         if((gsmAccess.begin(PINNUMBER)==GSM_READY) &
         (gprs.attachGPRS(GPRS_APN, GPRS_LOGIN, GPRS_PASSWORD)==GPRS_READY))
         notConnected = false;
   
      else {
        Serial.println("Not connected");
             delay(1000);
             }
       }

    Serial.println("GPRS connected...");
    Serial.println(" Connecting to Server ");
   }


   void loop()
   {

    if (client.connect(server, port)){

        client.print("GET /webllenado.txt");
        client.println(" HTTP/1.1");
        client.println("Host: www.ubuwebserver.es");
        client.println("User-Agent: Arduino");
        client.println("Accept: text/html");
        client.println("Connection: close");
        client.println();

        Serial.println("\nCOMPLETE!\n");
        }
        else {
        Serial.println("connection failed");
        }


     while (client.connected()) {
        while(client.available()) {
          char c = client.read();
          //Serial.print(c);
          if (z==c)
          {
             s=1;
          }

          if(s == 1 && c!='*')
          {
             int i=0;
             k[i] = c;
             i=i+1;
            //Serial.print(k);
           }
  
           place +=k;
       }
    }
    Serial.print("place = ");  
    Serial.print(place); 
    client.stop();
  }
2

Your code

is sloppy as

hell

and
difficult

to follow.

Get rid of the useless blank lines (not all of them; just the useless ones), and use Tools + Auto Format to properly indent your code.

   client.print("GET /webllenado.txt");

The argument to the GET request is the script to execute. I imagine that the server tried to execute that script, with less than stellar results.

3

PaulS:
Your code

is sloppy as

hell

and
difficult

to follow.

Get rid of the useless blank lines (not all of them; just the useless ones), and use Tools + Auto Format to properly indent your code.

I read your post before reading his and laughed both before and after expanding the code.

4

jalbo10

How'd you manage to send data from your sensor to your web server using the GSM? Is there any resources you used found most helpful for this ? Did you send the data from the SD or did you just stream it in real-time? I'd like to do both concurrently.

Regards
sjd1