ESP8266_Google_Analytics.ino

/*
  Written by Paul Trebilcox-Ruiz
  Based on code by PuzzleDuck. 
  Original source and explaination: https://www.instructables.com/id/-Arduinolitics-Google-Analytics-on-Arduino/
 */


#include <ESP8266WiFi.h>
//#include "floatToString.h"

# define LED D4 // Use built-in LED which connected to D4 pin or GPIO 2

const char* ssid = "";
const char* password = "";

String trackingID = "";
int deviceID = 42;
String payloadCategory = "Arduino";
String payloadAction = "Sensor";
String payloadLabel = "Random";
int trackingVersion = 1;

String payloadType ="event";// Must be one of 'pageview', 'appview', 'event', 'transaction', 'item', 'social', 'exception', 'timing'.
int payloadValue = 0;
char buffer[25];

int sensorValue;
WiFiClient client;

char *host = "www.google-analytics.com";

void setup() {
  Serial.begin(115200);
  delay(10);
  
  pinMode(LED, OUTPUT);     // Initialize the LED as an output

  randomSeed(analogRead(0));
  deviceID = random(1000);  //remove this line for static device ID.

  WiFi.begin(ssid, password);

  while( WiFi.status() != WL_CONNECTED ) {
    delay(500);
  }

  if (!client.connect(host, 80)) {
    Serial.println("connection failed");
    return;
  }
}

void loop() {
  digitalWrite(LED, HIGH);  // Turn the LED off because the LED is active low
  delay(1000);            // Wait a second
  digitalWrite(LED, LOW);   // Turn the LED on because the LED is active low
  delay(1000);              // Wait a second

  int val = analogRead(A0);
  sensorValue = map(val, 0, 1023, 1, 100);

  String payloadData = "v=";
        payloadData += trackingVersion;
        payloadData += "&tid=";
        payloadData += trackingID;
        payloadData += "&cid=";
        payloadData += deviceID;
        payloadData += "&t=";
        payloadData += payloadType;
        payloadData += "&ec=";
        payloadData += payloadCategory;
        payloadData += "&ea=";
        payloadData += payloadAction;
        payloadData += "-";
        payloadData += deviceID;
        payloadData += "&el=";
        payloadData += payloadLabel;
        payloadData += "&ev=";
//        itoa(externalHumid, buffer,10); //needed for floats
        payloadData += sensorValue;

if (client.connected()) {
    client.println("POST /collect HTTP/1.1");
    client.println("Host: www.google-analytics.com");
    client.print("Content-Length: ");
    client.println(payloadData.length());
    client.println();
    client.print(payloadData);
    client.println();
    Serial.print("connected: ");
    Serial.print(client.connected());
    Serial.print("    Avaliable: ");
    Serial.print(client.available());
    Serial.print("\n");
  } else {
    Serial.println("failed.. just skipping a beat for now");
  }

      unsigned long timeout = millis();
        while (client.available() == 0) {
          if (millis() - timeout > 5000) {
            Serial.println(">>> Client Timeout !");
            Serial.println(">>> Client Timeout !");
            Serial.println(">>> Client Timeout !");
            Serial.println(">>> Client Timeout !");
            client.stop();
            return;
          }
        }
        
        // Read all the lines of the reply from server and print them to Serial
        while(client.available()){
          String line = client.readStringUntil('\r');
          Serial.print(line);
        }

       delay(2000);
}