Development

» WiFi PRO 12: HTTP GET

This example shows how to perform HTTP GET requests

Required Materials

1 x Waspmote
1 x Battery
1 x WiFi PRO Module

Notes

- The battery has to be connected.
- This example can be executed in Waspmote v15

Code

/*  
 *  ------ WIFI Example -------- 
 *  
 *  Explanation: This example shows how to perform HTTP GET requests
 *  
 *  Copyright (C) 2016 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 3 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:           3.0
 *  Design:            David Gascon 
 *  Implementation:    Yuri Carmona
 */

// Put your libraries here (#include ...)
#include <WaspWIFI_PRO.h>


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


// SERVER settings
///////////////////////////////////////
char type[] = "http"; // "http" or "https"
char host[] = "pruebas.libelium.com";
char port[] = "80";
char link[] = "getpost_frame_parser.php?counter=1&varA=1&varB=2&varC=3&varD=4&varE=5&varF=6&varG=7&varH=8&varI=9&varJ=10&varK=11&varL=12&varM=13&varN=14&varO=15";
///////////////////////////////////////


uint8_t error;
uint8_t status;
unsigned long previous;


void setup() 
{
  USB.println(F("Start program"));  
  USB.println(F("***************************************"));  
  USB.println(F("Once the module is set with one or more"));
  USB.println(F("AP settings, it attempts to join the AP"));
  USB.println(F("automatically once it is powered on"));    
  USB.println(F("Refer to example 'WIFI_PRO_01' to configure"));  
  USB.println(F("the WiFi module with proper settings"));
  USB.println(F("***************************************"));
}



void loop()
{   
  // get actual time
  previous = millis();

  //////////////////////////////////////////////////
  // 1. Switch ON
  //////////////////////////////////////////////////  
  error = WIFI_PRO.ON(socket);

  if (error == 0)
  {    
    USB.println(F("WiFi switched ON"));
  }
  else
  {
    USB.println(F("WiFi did not initialize correctly"));
  }


  //////////////////////////////////////////////////
  // 2. Join AP
  //////////////////////////////////////////////////  

  // check connectivity
  status =  WIFI_PRO.isConnected();

  // Check if module is connected
  if (status == true)
  {    
    USB.print(F("WiFi is connected OK"));
    USB.print(F(" Time(ms):"));    
    USB.println(millis()-previous);


    // http request
    error = WIFI_PRO.getURL( type, host, port, link); 

    // check response
    if (error == 0)
    {
      USB.println(F("HTTP GET OK"));          
      USB.print(F("HTTP Time from OFF state (ms):"));
      USB.println(millis()-previous);
      
      USB.print(F("\nServer answer:"));
      USB.println(WIFI_PRO._buffer, WIFI_PRO._length);
    }
    else
    {
      USB.println(F("Error calling 'getURL' function"));
      WIFI_PRO.printErrorCode();
    }
  }
  else
  {
    USB.print(F("WiFi is connected ERROR")); 
    USB.print(F(" Time(ms):"));    
    USB.println(millis()-previous);  
  }


  //////////////////////////////////////////////////
  // 3. Switch OFF
  //////////////////////////////////////////////////  
  WIFI_PRO.OFF(socket);
  USB.println(F("WiFi switched OFF\n\n")); 
  delay(10000);
}

Output

H#
Start program
***************************************
Once the module is set with one or more
AP settings, it attempts to join the AP
automatically once it is powered on
Refer to example 'WIFI_PRO_01' to configure
the WiFi module with proper settings
***************************************
WiFi switched ON
WiFi is connected OK Time(ms):5149
HTTP GET OK
HTTP Time from OFF state (ms):5552

Server answer:method::GET;
counter::1;
varA::1;
varB::2;
varC::3;
varD::4;
varE::5;
varF::6;
varG::7;
varH::8;
varI::9;
varJ::10;
varK::11;
varL::12;
varM::13;
varN::14;
varO::15;
error::id_wasp;


WiFi switched OFF


WiFi switched ON
WiFi is connected OK Time(ms):5709
HTTP GET OK
HTTP Time from OFF state (ms):6128

Server answer:method::GET;
counter::1;
varA::1;
varB::2;
varC::3;
varD::4;
varE::5;
varF::6;
varG::7;
varH::8;
varI::9;
varJ::10;
varK::11;
varL::12;
varM::13;
varN::14;
varO::15;
error::id_wasp;


WiFi switched OFF

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