ESP32 code

gistfile1.txt

#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);   
}