WiFi PRO 27: Send to Libelium cloud Bridge
This example shows how to perform HTTPS GET requests to the Libelium Bridge.
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 HTTPS GET requests
to the Libelium Hive.
Copyright (C) 2018 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 .
Version: 3.0
Design: David Gascon
Implementation: Yuri Carmona
*/
// Put your libraries here (#include ...)
#include <WaspWIFI_PRO.h>
#include <WaspFrame.h>
// choose socket (SELECT USER'S SOCKET)
///////////////////////////////////////
uint8_t socket = SOCKET0;
///////////////////////////////////////
// SERVER settings
////////////////////////////////////////////////////////////////////////
const char flash_http_format[] PROGMEM = "GET %s?frame=%s HTTP/1.1\r\nHost: %s\r\nContent-Length: 0\r\n";
const char flash_http_host[] PROGMEM = "hw.libelium.com";
const char flash_http_path[] PROGMEM = "/hw/ps";
const char flash_http_rport[] PROGMEM = "443";
const char* const flash_http_table[] PROGMEM = {flash_http_format, flash_http_host, flash_http_path, flash_http_rport};
////////////////////////////////////////////////////////////////////////
// buffer of memory to create the request
char data[1500];
// define data to send through TCP socket
////////////////////////////////////////////////////////////////////////
char http_format[] =
"GET /hw/ps?frame=%s HTTP/1.1\r\n"\
"Host: %s\r\n"\
"Content-Length: 0\r\n"\
"Authorization: Bearer %s\r\n\r\n";
////////////////////////////////////////////////////////////////////////
// define certificate for SSL
////////////////////////////////////////////////////////////////////////
const char certificate[] PROGMEM =
"-----BEGIN CERTIFICATE-----\r"\
"MIID3DCCAsSgAwIBAgIJAMrHeK4tOUN7MA0GCSqGSIb3DQEBCwUAMIGBMQswCQYD\r"\
"VQQGEwJFUzERMA8GA1UECAwIWmFyYWdvemExETAPBgNVBAcMCFphcmFnb3phMTIw\r"\
"MAYDVQQKDClMaWJlbGl1bSBDb211bmljYWNpb25lcyBEaXN0cmlidWlkYXMgUy5M\r"\
"LjEYMBYGA1UEAwwPaHcubGliZWxpdW0uY29tMCAXDTE4MTAwMzA4NDkyOVoYDzIx\r"\
"MTgwOTA5MDg0OTI5WjCBgTELMAkGA1UEBhMCRVMxETAPBgNVBAgMCFphcmFnb3ph\r"\
"MREwDwYDVQQHDAhaYXJhZ296YTEyMDAGA1UECgwpTGliZWxpdW0gQ29tdW5pY2Fj\r"\
"aW9uZXMgRGlzdHJpYnVpZGFzIFMuTC4xGDAWBgNVBAMMD2h3LmxpYmVsaXVtLmNv\r"\
"bTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAMo3Fif9BlMOUmGRJxSq\r"\
"JUYZUpPbJULBpegbxGLpiie4fTvEfml7csj8EhHch5ItWi+Zq6m8VfOJ7kAO1vxv\r"\
"UYmprH+GfJXnQzBPROrazRu5fDk9C5NjTTu7PqNvmD3RLEnAWvY+k/B7qjqfXr5V\r"\
"IWoQScIOgn2y/Qf2QGYf710uswPPOEMRZQ1oo9EE8zy9gsplQ8ym1xmENPavdv/x\r"\
"5Fccyj3O0Gd6pXtTVZq0n5w/7qFEG55sRFJXnXXdxzgsRSdUk8wPpgZi7r05o2YP\r"\
"YXHnoX0CcrfyPZE7wlijYIokzHxUZLvO0UnL8ZWzu+s4ULPANaQN03TTIO8zoXns\r"\
"CwsCAwEAAaNTMFEwHQYDVR0OBBYEFE/Yuv3pY1LdcfuD5pre9qFNhynjMB8GA1Ud\r"\
"IwQYMBaAFE/Yuv3pY1LdcfuD5pre9qFNhynjMA8GA1UdEwEB/wQFMAMBAf8wDQYJ\r"\
"KoZIhvcNAQELBQADggEBACR4VyHIyeo9wJZfEAY/riv2y9kKorRIKU5uaKMMGFS0\r"\
"tBV4/8sBJT16oc/PMAfpY7ot8Y6L5wxTaSXL4MsZM1QWD/DWehRGzDrjJPvZEEpW\r"\
"x1moImbaCRr9THGV/Wg0gtbm5L8HCq0WWFaNKq4lZMUC1YkFDrKq2a23hoWEhihb\r"\
"RxDudy0QehgqOIv+m0wLCfCcDqywCeuFXRaijDEj1wMW+1JVW1CPxwTiU+APeNMe\r"\
"T4ebvxqEPrENm6LYCujZR8t+T/zlssqDiev218zRJWikMO+OOkMa08uWHx3gq1Pe\r"\
"/CkY3qjmAgVx6yvbvo6mDkUK8MlzQCisbK/CLdOgefk=\r"\
"-----END CERTIFICATE-----";
const char* const certificate_table[] PROGMEM = {certificate};
////////////////////////////////////////////////////////////////////////
// Define Token for user authentication
////////////////////////////////////////////////////////////////////////
const char TOKEN_HEADER[] PROGMEM = "Authorization: Bearer ";
const char TOKEN_1024[] PROGMEM = "eyJqdGkiOiI1MDlhOTFmYzE0YjIwNzI2ZjFjOGJlMjI5ODJmNDE2NzgzNTdhNjIyZWIxMzNjOGUxY2VhNWMzMDE0OGJjNjZlODNmZTY4YTZjODgzMmUwMiIsInR5cCI6IkpXVCIsImFsZyI6IlJTMjU2In0.eyJhdWQiOjQsImp0aSI6IjUwOWE5MWZjMTRiMjA3MjZmMWM4YmUyMjk4MmY0MTY3ODM1N2E2MjJlYjEzM2M4ZTFjZWE1YzMwMTQ4YmM2NmU4M2ZlNjhhNmM4ODMyZTAyIiwiaWF0IjoxNTQ0NjEyMjM5LCJuYmYiOjE1NDQ2MTIyMzksImV4cCI6MTU3NjE0ODIzOSwic3ViIjo2LCJzY29wZXMiOltdLCJtZXNoLmd3X2lkIjoiW21lc2guZnJlZV0gKDU0MCkgeS5jYXJtb25hQGxpYmVsaXVtLmNvbSIsIm1lc2guZ3dfcG9sIjoiNWJlZWIzODk1MWFmNzkyOWYzMDAwMDAzIn0.sHSyI0Jb5Khu8INPtC98ZHSov1UQoBC9V6NNfWbfty6s09uIsByUlxTkmJlSvwCluj9d06fTOTETfmwpY7FPbnWEj7u8oqr4nnRq9oDp2vmgC_yrzYsv-vVRK6eFCEaXrVSbO-t1ls-bftA4R7J2DBWR0hLXLe3-bUAcu6tPPJU";
const char TOKEN_END[] PROGMEM = "\r\n\r\n";
const char* const token_table[] PROGMEM = {TOKEN_HEADER, TOKEN_1024, TOKEN_END};
////////////////////////////////////////////////////////////////////////
uint8_t error;
uint8_t status;
uint32_t previous;
uint16_t socket_handle = 0;
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("***************************************"));
//////////////////////////////////////////////////
// 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 Trusted CA
//////////////////////////////////////////////////
error = wifiSetCertificate();
if (error == 0)
{
USB.println(F("2. Trusted CA set OK"));
}
else
{
USB.println(F("2. Error calling 'setCA' function"));
WIFI_PRO.printErrorCode();
}
//////////////////////////////////////////////////
// 3. Switch OFF
//////////////////////////////////////////////////
USB.println(F("3. WiFi switched OFF"));
WIFI_PRO.OFF(socket);
USB.println();
USB.println(F("************* SETUP done **************"));
USB.println();
}
void loop()
{
USB.println();
USB.println(F("************** New LOOP ***************"));
//////////////////////////////////////////////////
// 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. Check if connected
//////////////////////////////////////////////////
// get actual time
previous = millis();
// check connectivity
status = WIFI_PRO.isConnected();
// check if module is connected
if ( status == true )
{
USB.print(F("2. WiFi is connected OK"));
USB.print(F(" Time(ms):"));
USB.println(millis() - previous);
// get IP address
error = WIFI_PRO.getIP();
if (error == 0)
{
USB.print(F("IP address: "));
USB.println( WIFI_PRO._ip );
}
else
{
USB.println(F("getIP error"));
}
////////////////////////////////////////////////
// 3. Send data
////////////////////////////////////////////////
RTC.ON();
RTC.getTime();
// set identifier
frame.setID("Node01");
// Create new frame
frame.createFrame(BINARY);
// set frame fields (Time from RTC)
frame.addSensor(SENSOR_TIME, RTC.hour, RTC.minute, RTC.second);
// show frame contents
USB.println(F("3. Frame created:"));
frame.showFrame();
// send data via TCP secure socket
sendFrame();
}
else
{
USB.print(F("2. WiFi is connected ERROR"));
USB.print(F(" Time(ms):"));
USB.println(millis() - previous);
}
//////////////////////////////////////////////////
// 4. Switch OFF
//////////////////////////////////////////////////
USB.println(F("4. WiFi switched OFF\n"));
WIFI_PRO.OFF(socket);
USB.println(F("DeepSleep for 10 seconds...\n"));
PWR.deepSleep("00:00:00:10", RTC_OFFSET, RTC_ALM1_MODE2, ALL_OFF);
USB.println();
USB.println();
}
/***********************************************************************
This function configures SSL certificate into the WiFi module
***********************************************************************/
uint8_t wifiSetCertificate()
{
char certificate[1500];
memset(certificate, 0x00, sizeof(certificate));
// read certificate from flash memory
strcat_P(certificate, (char*)pgm_read_word(&(certificate_table[0])));
// set CA certificate for HTTPS
if (strlen(certificate) > 1500)
{
USB.println(F("WiFi CA certificate length is greater than 1500 bytes"));
}
return WIFI_PRO.setCA(certificate);
}
/***********************************************************************
Generate HTTP request
***********************************************************************/
void genHttpRequestFrame(char *pointer, uint16_t size)
{
// get the http format from flash
char http_format[100];
char host[60];
char path[60];
memset(http_format, 0x00, sizeof(http_format));
memset(host, 0x00, sizeof(host));
memset(path, 0x00, sizeof(path));
strcpy_P(http_format, (char*)pgm_read_word(&(flash_http_table[0])));
strcpy_P(host, (char*)pgm_read_word(&(flash_http_table[1])));
strcpy_P(path, (char*)pgm_read_word(&(flash_http_table[2])));
// define 'frame_string' buffer
char frame_string[frame.length * 2 + 1];
memset(frame_string, 0x00, sizeof(frame_string));
// convert frame from bytes to ASCII representation
for (uint16_t i = 0; i < frame.length; i++)
{
Utils.hex2str(&frame.buffer[i], &frame_string[i * 2], 1);
}
// generate http get request
snprintf( pointer, size - 1, http_format, path, frame_string, host);
}
/***********************************************************************
Add Token to HTTP request
***********************************************************************/
void addToken(char *pointer, uint16_t size)
{
// concatenate last header to HTTP request
strcat_P(pointer, (char*)pgm_read_word(&(token_table[0])));
strcat_P(pointer, (char*)pgm_read_word(&(token_table[1])));
strcat_P(pointer, (char*)pgm_read_word(&(token_table[2])));
USB.println();
USB.println();
USB.println(F("HTTP request:"));
USB.println(F("-------------------------------"));
USB.println(pointer);
USB.println(F("-------------------------------"));
USB.println();
}
/***********************************************************************
send current frame contents via WiFi
***********************************************************************/
void sendFrame()
{
char resource[1200];
char host[60];
char rport[20];
memset(host, 0x00, sizeof(host));
memset(rport, 0x00, sizeof(rport));
strcpy_P(host, (char*)pgm_read_word(&(flash_http_table[1])));
strcpy_P(rport, (char*)pgm_read_word(&(flash_http_table[3])));
// check connectivity
status = WIFI_PRO.isConnected();
// Check if module is connected
if (status == true)
{
USB.println(F("WiFi is connected OK"));
// get IP address
error = WIFI_PRO.getIP();
if (error == 0)
{
USB.print(F("WiFi module IP address: "));
USB.println( WIFI_PRO._ip );
}
else
{
USB.println(F("WiFi module error getting IP address"));
}
// set TCP client
error = WIFI_PRO.setTCPclient( host, rport, NULL);
// check response
if (error == 0)
{
// get socket handle (from 0 to 9)
socket_handle = WIFI_PRO._socket_handle;
USB.print(F("WiFi module set up a TCP socket in handle: "));
USB.println(socket_handle, DEC);
}
else
{
USB.print(F("WiFi module return error in TCP connection "));
WIFI_PRO.printErrorCode();
status = false;
}
if (status == true)
{
// SSL hand shake
error = WIFI_PRO.sslHandshake(socket_handle);
if (error == 0)
{
USB.println(F("WiFi module SSL handshake OK"));
}
else
{
USB.println(F("WiFi module SSL handshake error"));
WIFI_PRO.printErrorCode();
}
// generate http get request
genHttpRequestFrame(resource, sizeof(resource));
addToken(resource, sizeof(resource));
error = WIFI_PRO.send( socket_handle, resource);
if (error == 0)
{
USB.println(F("WiFi module sent data OK"));
}
else
{
USB.print(F("WiFi module returned error sending data "));
WIFI_PRO.printErrorCode();
}
}
// Wait for answer from server
error = WIFI_PRO.receive(socket_handle, 10000);
// check answer
if (error == 0)
{
USB.println(F("WiFi module Server response:"));
USB.println(F("-------------------------------"));
USB.println(WIFI_PRO._buffer, WIFI_PRO._length);
USB.println(F("-------------------------------"));
}
// Close socket
error = WIFI_PRO.closeSocket(socket_handle);
// check response
if (error == 0)
{
USB.println(F("WiFi module close socket OK"));
}
else
{
USB.print(F("WiFi module returned error closing the connection "));
WIFI_PRO.printErrorCode();
}
}
else
{
USB.println(F("WiFi is not connected to network"));
}
}
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