Development

» WiFi PRO 13: HTTP POST

This example shows how to perform HTTP POST 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 POST 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";
char host[] = "pruebas.libelium.com";
char port[] = "80";
char url[]  = "getpost_frame_parser.php?";
///////////////////////////////////////


// example of body for POST request
char body[] = "varA=1&varB=2&varC=3&varD=4&varE=5";

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("1. WiFi switched ON"));
  }
  else
  {
    USB.println(F("1. WiFi did not initialize correctly"));
  }


  //////////////////////////////////////////////////
  // 2. Set url
  //////////////////////////////////////////////////  
  error = WIFI_PRO.setURL( type, host, port, url );

  // check response
  if (error == 0)
  {
    USB.println(F("2. setURL OK"));
  }
  else
  {
    USB.println(F("2. Error calling 'setURL' function"));
    WIFI_PRO.printErrorCode();
  }


  //////////////////////////////////////////////////
  // 3. Join AP
  //////////////////////////////////////////////////  

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

  // Check if module is connected
  if (status == true)
  {    
    USB.print(F("3. WiFi is connected OK"));
    USB.print(F(" Time(ms):"));
    USB.println(millis()-previous);

    
    ////////////////////////////////////////////////
    // 3.1. http request
    ////////////////////////////////////////////////
    error = WIFI_PRO.post(body); 

    // check response
    if (error == 0)
    {
      USB.print(F("3.1. HTTP POST 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("3.1. Error calling 'post' function"));
      WIFI_PRO.printErrorCode();
    }
  }
  else
  {
    USB.print(F("3. WiFi is connected ERROR"));
    USB.print(F(" Time(ms):"));
    USB.println(millis()-previous);
  }


  //////////////////////////////////////////////////
  // 4. Switch OFF
  //////////////////////////////////////////////////  
  WIFI_PRO.OFF(socket);
  USB.println(F("4. 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
***************************************
1. WiFi switched ON
2. setURL OK
3. WiFi is connected OK Time(ms):2026
3.1. HTTP POST OK. HTTP Time from OFF state (ms):2283

Server answer:method::POST;
POST;varA::1;
POST;varB::2;
POST;varC::3;
POST;varD::4;
POST;varE::5;
error::id_wasp;


4. WiFi switched OFF


1. WiFi switched ON
2. setURL OK
3. WiFi is connected OK Time(ms):5726
3.1. HTTP POST OK. HTTP Time from OFF state (ms):5985

Server answer:method::POST;
POST;varA::1;
POST;varB::2;
POST;varC::3;
POST;varD::4;
POST;varE::5;
error::id_wasp;


4. WiFi switched OFF

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