Development v12

Warning - Product Update

All the resources present on this section belong to Waspmote v12, Waspmote Plug & Sense! v12 and Meshlium v3.8.

If you have a Waspmote v15, Waspmote Plug & Sense! v15 or Meshlium v4.0 please go to the new Development Section.

Check what is your version and what are the differences between the old and the new one in this document.

» Wifi 26: HTTP GET

This example shows how to send a HTTP GET request message.

Required Materials

1 x Waspmote
1 x Battery
1 x WiFi Module

Notes

- The battery has to be connected.
- Plug the antenna in the SMA connector.
- Remember to set the correct AP settings
- Make sure you have a php file in the server you set listening to messages
- This example can be executed in Waspmote v12 and Waspmote v15

Code

/*
 *  ------Waspmote WIFI_26 Example--------
 *
 *  Explanation: This example shows how to send a HTTP get request 
 *  message. 
 *
 *  Copyright (C) 2014 Libelium Comunicaciones Distribuidas S.L.
 *  http://www.libelium.com
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 2 of the License, or
 *  (at your option) any later version.
 * 
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 * 
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 *  Version:                0.3
 *  Design:                 David Gascón
 *  Implementation:         Joaquin Ruiz, Yuri Carmona
 */

// Include WIFI library 
#include <WaspWIFI.h>

// choose socket (SELECT USER'S SOCKET)
///////////////////////////////////////
uint8_t socket=SOCKET0;
///////////////////////////////////////

// WiFi AP settings (CHANGE TO USER'S AP)
/////////////////////////////////
#define ESSID "libelium_AP"
#define AUTHKEY "password"
/////////////////////////////////

// WEB server settings 
/////////////////////////////////
#define WEB_SERVER "pruebas.libelium.com"
/////////////////////////////////


// define variable for communication status
uint8_t status;
uint8_t counter=0;
char sentence[100];
unsigned long previous;


void setup()
{
  if( WIFI.ON(socket) == 1 )
  {    
    USB.println(F("WiFi switched ON"));
  }
  else
  {
    USB.println(F("WiFi did not initialize correctly"));
  }

  // reset to avoid previous configuration stored in the module
  //WIFI.resetValues();

  // 1. Configure the transport protocol (UDP, TCP, FTP, HTTP...)
  WIFI.setConnectionOptions(HTTP|CLIENT_SERVER);
  // 2. Configure the way the modules will resolve the IP address.
  WIFI.setDHCPoptions(DHCP_ON);
  // 3. Configure how to connect the AP 
  WIFI.setJoinMode(MANUAL);   
  // 4. Set the AP authentication key
  WIFI.setAuthKey(WPA1,AUTHKEY); 
  // 5. Save Data to module's memory
  WIFI.storeData();

}


void loop()
{ 
  // switch on the WiFi module  
  WIFI.ON(socket);

  // If it is manual, call join giving the name of the AP     
  if( WIFI.join(ESSID) )
  { 
    USB.println(F("Joined"));

    /////////////////////////////////////////// 
    // Create the sentence
    /////////////////////////////////////////// 
    RTC.ON();
    RTC.getTime();
    counter++;
    sprintf(sentence,"GET$/test-get-post.php?counter=%u&time=%02u:%02u:%02u",counter,RTC.hour,RTC.minute,RTC.second);

    USB.print("sentence:");
    USB.println(sentence);

    /////////////////////////////////////////// 
    // Send the HTTP get/post query (specifying the WEB server so DNS is used)
    /////////////////////////////////////////// 
    status = WIFI.getURL(DNS, WEB_SERVER, sentence);

    if( status == 1)
    {
      USB.println(F("\nHTTP query OK."));
      USB.print(F("WIFI.answer:"));
      USB.println(WIFI.answer);
      
      /*
       * At this point, it could be possible
       * to parse the web server information
       */
    }
    else
    {
      USB.println(F("\nHTTP query ERROR"));
      counter--; 
    }
  } 
  else
  {
    USB.println(F("NOT joined"));
  }
  
  
  // switch off module 
  WIFI.OFF();  
  USB.println(F("***************************"));  
  delay(1000);
} 

Output

H#
WiFi switched ON
Joined
sentence:GET$/test-get-post.php?counter=1&time=18:03:54

HTTP query OK.
WIFI.answer:HTTP/1.1 200 OK
Date: Tue, 04 Feb 2014 17:04:31 GMT
Server: Apache
X-Powered-By: PHP/5.3.28
Connection: close
Content-Type: text/html

method::get;counter::1;time::18:03:54;*CLOS*
***************************
Joined
sentence:GET$/test-get-post.php?counter=2&time=18:04:10

HTTP query OK.
WIFI.answer:HTTP/1.1 200 OK
Date: Tue, 04 Feb 2014 17:04:46 GMT
Server: Apache
X-Powered-By: PHP/5.3.28
Connection: close
Content-Type: text/html

method::get;counter::2;time::18:04:10;*CLOS*
***************************
...

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