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ESP32 code
#include <WiFi.h> //Wifi library
#include <HTTPClient.h> // Library for HTTPS GET request
#include "mbedtls/md.h"
#include "esp_wpa2.h" //WPA2 library for Eduroam Connection
#define EAP_IDENTITY "USERNAME"
#define EAP_PASSWORD "PASSWORD"
const char* ssid = "eduroam";
long chipid; // Variable for unique chip ID
int counter; // Variable for WiFi timeout
// Include the libraries for the ext temp sensor
#include <OneWire.h>
#include <DallasTemperature.h>
// GPIO where the DS18B20 is connected to
const int oneWireBus = 15;
// Setup a oneWire instance to communicate with any OneWire devices
OneWire oneWire(oneWireBus);
// Pass our oneWire reference to Dallas Temperature sensor
DallasTemperature sensors(&oneWire);
extern "C" { // Init function to read internal ESP32 temp
uint8_t temprature_sens_read();
}
// Root CA pub used on server
const char* root_ca= \
"-----BEGIN CERTIFICATE-----\n" \
"MILDSjCCAjKgAwIBAgIQRK+waNajJ7qJMDmGLvhAazANBgkqhkiG9w0BAQUFADA/\n" \
"MSQwIgYDVQQKExtEaWdpdGFsIFNpZ25hdHVyZSBUcnVzdCBDby4xFzAVBgNVBAMT\n" \
"DkRTVCBSb290IENBIFgzMB4XDTAwMDkzMDIxMTIxOVoXDTIxMDkzMDE0MDExNVow\n" \
"PzEkMCIGA1UEChMbRGlnaXRhbCBTaWduYXR1cmUgVHJ1c3QgQ28uMRcwFQYDVQQD\n" \
"Ew5EU1QgUm9vdCBDQSBYMzCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEB\n" \
"AN+v6ZdQCINXtMxiZfaQguzH0yxrMMpb7NnDfcdAwRgUi+DoM3ZJKuM/IUmTrE4O\n" \
"rz5Iy2Xu/xAxD2XSKtkyj4zl93ewEnu1lcCJo6m67XMuegwGMoOifooUMM0RoOEq\n" \
"OLl5CjH9UL2AZd+3UWODyOKIYepLYYHsUmu5ouJLGiifSKOeDNoJjj4XLh7dIN9b\n" \
"xiqKqy69cK3FCxolkHRyxXtqqzTWMIn/5WgTe1QLyNau7Fqcxh49ZLOMxt+/yUFw\n" \
"7BZy1SbsOFU5Q9D8/RhcQPGX69Wam40dutolucbY38EVAjqr2m7xPi71XAicPNaD\n" \
"aeQQmxkqtilX4+U9m5/wAl0CAwEAAaNCMEAwDwYDVR0TAQH/BAUwAwEB/zAOBgNV\n" \
"HQ8BAf8EBAMCAQYwHQYDVR0OBBYEFMSnsaR7LHH62+FLkHX/xBVghYkQMA0GCSqG\n" \
"SIb3DQEBBQUAA4IBAQCjGiybFwBcqR7uKGY3Or+Dxz9LwwmglSBd49lZRNI+DT69\n" \
"ikugdB/OEIKcdBodfpga3csTS7MgPOSR6cz8faXbauX+5v3gTt23ADq1cEmv8uXr\n" \
"AvHRAosZy5Q6XkjEGB5YGV8eAlrwDPGxrancWYaLbumR9YbK+rlmM6pZW87ipxZz\n" \
"R8srzJmwN0jP41ZL9c8PDHIyh8bwRLtTcm1D9SZImlJnt1ir/md2cXjbDaJWFBM5\n" \
"JDGFoqgCWjBH4d1QB7wCCZAA62RjYJsWvIjJEubSfZAL+T0yjWW06XyxV3bqxbYo\n" \
"Ob8VZRzI9neWagqNdwvYkQsEjgfbKbYK7p2CPTUQ\n" \
"-----END CERTIFICATE-----";
void setup() {
sensors.begin();
// Get unique device ID
chipid = ESP.getEfuseMac();
WiFi.disconnect(true); //disconnect form wifi to set new wifi connection
WiFi.mode(WIFI_STA); //init wifi mode
esp_wifi_sta_wpa2_ent_set_identity((uint8_t *)EAP_IDENTITY, strlen(EAP_IDENTITY)); //provide identity
esp_wifi_sta_wpa2_ent_set_username((uint8_t *)EAP_IDENTITY, strlen(EAP_IDENTITY)); //provide username --> identity and username is same
esp_wifi_sta_wpa2_ent_set_password((uint8_t *)EAP_PASSWORD, strlen(EAP_PASSWORD)); //provide password
esp_wpa2_config_t config = WPA2_CONFIG_INIT_DEFAULT(); //set config settings to default
esp_wifi_sta_wpa2_ent_enable(&config); //set config settings to enable function
WiFi.begin(ssid); //connect to wifi
// Was the connnection successful?
while (WiFi.status() != WL_CONNECTED) {
delay(500);
counter++;
if(counter>=60){ //after 30 seconds timeout - reset board
ESP.restart();
}
}
// Yes, we're connected!
}
void loop() {
// Are we still connected to WiFi?
if (WiFi.status() == WL_CONNECTED) {
// Yes, reset counter.
counter = 0;
}else if (WiFi.status() != WL_CONNECTED) {
// No! Let's restart the connection..
WiFi.begin(ssid);
}
// If we had to restart the connection, wait until it's ready..
while (WiFi.status() != WL_CONNECTED) {
delay(500);
counter++;
if(counter>=60){ //30 seconds timeout - reset board
ESP.restart();
}
}
// Let's create the payload
const char* request;
request ="https://server.com/api.php?id=%08X&value=%.2f";
char bigBuf[100] = "";
// Get internal temperature
uint8_t temp_farenheit= temprature_sens_read();
//convert farenheit to celcius
float temp = ( temp_farenheit - 32 ) / 1.8;
int tempint = round(temp);
// Get external sensor data
float temperatureC = -100.00;
while (temperatureC < -99.00){
sensors.requestTemperatures();
temperatureC = sensors.getTempCByIndex(0);
Serial.println(temperatureC);
//temperatureC = 20.01;
}
sprintf_P(bigBuf, request, chipid, temperatureC);
Serial.println(bigBuf);
// Init the HTTP connection variable
HTTPClient http;
// Setup the Useragent string using the chipid
const char* useragent;
useragent = "JD-ESP-[%08X]";
char completeuseragent[100] = "";
sprintf_P(completeuseragent, useragent, chipid);
http.setUserAgent( completeuseragent ) ;
// Begin the HTTP connection
http.begin(bigBuf, root_ca);
// Make the GET request and return the response code
int httpCode = http.GET();
if (httpCode > 0) {
fastblink();
String payload = http.getString();
}
http.end(); //Free the resources
delay(10000);
}
void fastblink(){
digitalWrite(13, HIGH);
delay(50);
digitalWrite(13, LOW);
delay(50);
digitalWrite(13, HIGH);
delay(50);
digitalWrite(13, LOW);
delay(50);
digitalWrite(13, HIGH);
delay(50);
digitalWrite(13, LOW);
delay(50);
}
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