get data via GET using arduino

Other Hardware Home Automation
1

How to get data via GET using arduino?

exemplo: 192.168.1.10/?cel=+5512345678&msg=hello+im+the+msg

I would like to take this data and save it in a variable. I've been reading a lot but everything seems extremely complicated, someone could provide an example or tutorial for simple understanding?

2

basic client GET test code.

//zoomkat 9-22-12
//simple client test
//for use with IDE 1.0.1
//with DNS, DHCP, and Host
//open serial monitor and send an e to test
//for use with W5100 based ethernet shields
//remove SD card if inserted

#include <SPI.h>
#include <Ethernet.h>

byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED }; //physical mac address

char serverName[] = "web.comporium.net"; // zoomkat's test web page server
EthernetClient client;

//////////////////////

void setup(){

  if (Ethernet.begin(mac) == 0) {
    Serial.println("Failed to configure Ethernet using DHCP");
    // no point in carrying on, so do nothing forevermore:
    while(true);
  }

  Serial.begin(9600); 
  Serial.println("Better client test 9/22/12"); // so I can keep track of what is loaded
  Serial.println("Send an e in serial monitor to test"); // what to do to test
}

void loop(){
  // check for serial input
  if (Serial.available() > 0) //if something in serial buffer
  {
    byte inChar; // sets inChar as a byte
    inChar = Serial.read(); //gets byte from buffer
    if(inChar == 'e') // checks to see byte is an e
    {
      sendGET(); // call sendGET function below when byte is an e
    }
  }  
} 

//////////////////////////

void sendGET() //client function to send/receive GET request data.
{
  if (client.connect(serverName, 80)) {  //starts client connection, checks for connection
    Serial.println("connected");
    client.println("GET /~shb/arduino.txt HTTP/1.0"); //download text
    client.println("Host: web.comporium.net");
    client.println(); //end of get request
  } 
  else {
    Serial.println("connection failed"); //error message if no client connect
    Serial.println();
  }

  while(client.connected() && !client.available()) delay(1); //waits for data
  while (client.connected() || client.available()) { //connected or data available
    char c = client.read(); //gets byte from ethernet buffer
    Serial.print(c); //prints byte to serial monitor 
  }

  Serial.println();
  Serial.println("disconnecting.");
  Serial.println("==================");
  Serial.println();
  client.stop(); //stop client

}
3

I found this code here, it handles HTTP GET, if anyone needs ....

#define TAMANHO_QUERY_STRING 320
#define TAMANHO_SEGUNDA_PARTE 315
#define TAMANHO_TEXT 300
#define TAMANHO_NUMERO 15

String getValue(String data, char separator, int index)
{
  int found = 0;
  int strIndex[] = {0, -1};
  int maxIndex = data.length()-1;

  for(int i=0; i<=maxIndex && found<=index; i++){
    if(data.charAt(i)==separator || i==maxIndex){
        found++;
        strIndex[0] = strIndex[1]+1;
        strIndex[1] = (i == maxIndex) ? i+1 : i;
    }
  }

  return found>index ? data.substring(strIndex[0], strIndex[1]) : "";
}

void loop(){
	boolean na_query = false;
	char queryString[TAMANHO_QUERY_STRING];

	while (client.connected()) {
		char c = client.read();

		//Pulamos até a query string (apos o primeiro espaço)
		if(c!=' ' && !na_query) {
			continue;
		} else {
			na_query = true;
		}

		//Colocamos o byte na query
		queryString.concat(c);

		//Verifica se terminou a query string
		if (c==' ' && na_query) {
			break;
		}
	}

	char segundaParte[TAMANHO_SEGUNDA_PARTE];
	segundaParte = getValue(queryString, '?', 1);

	char text_undecode[TAMANHO_TEXT];
	char numero[TAMANHO_NUMERO];

	text_undecode   = getValue(segundaParte, '&', 0);
	numero          = getValue(segundaParte, '&', 1);
}