Publish from ESP8266 to dweet.io (part 1)

NodeMCU_template_1.ino

#include <Arduino.h>
#include <ESP8266WiFi.h>

/*
 * Setup code for publishing Arduino sensors to dweet.io
 * Part 1
 * Written by Liz Miller
 * Provided by Learn Robotics (www.learnrobotics.org)
 * Version 1.0
 * 7-10-18
 * ---
 * The Software is provided "AS IS" and "WITH ALL FAULTS," 
 * without warranty of any kind, including without limitation 
 * the warranties of merchantability, fitness for a particular 
 * purpose and non-infringement. 
 * 
 * NOT FOR USE TO CONTROL PRODUCTION EQUIPMENT. 
 * SERIOUS INJURY COULD RESULT.
 */

// WiFi parameters
const char* ssid = "#"; //replace with your ssid
const char* password = "#";//replace with your pw
String thingName="ardumini";//thing for grouping all the data together
const char* host = "dweet.io"; //host :) for tcp connection

//Initialize the names & values of our metrics for dweet.io
String arrayVariableNames[]={"Brightness", "Status", "Staff"};
int arrayVariableValues[]={0,0,0};

//tells the number of arguments inside each array
int numberVariables=sizeof(arrayVariableValues)/sizeof(arrayVariableValues[0]);

int staff; //operator present: 1 = staffed, 0 = unstaffed
int status; //machine status: 1 = running, 0 = down

// Button & LED Pin Numbers
const int yellowButton = 15;    // the number of the pushbutton pin
const int yellowLED = 14;      // the number of the LED pin

const int redButton = 4;    // the number of the pushbutton pin
const int redLED = 5;      // the number of the LED pin

const int ldr = A0; // the number of the ldr pin
int ldrData; //storage for LDR data

/*
 * Configuration - runs once
 */
void setup() {
    // put your setup code here, to run once:
    pinMode(ldr,INPUT);
    pinMode(redButton,INPUT);
    pinMode(yellowButton,INPUT);

    pinMode(redLED,OUTPUT);
    pinMode(yellowLED,OUTPUT);

    // set initial LED state
    digitalWrite(yellowLED, ledStateY);
    digitalWrite(redLED, ledStateR);

    //NodeMCU runs @ 9600 baud
    Serial.begin(9600);

    //Connect to WiFi Network
    Serial.println();
    Serial.println();
    Serial.print("Connecting to ");
    Serial.print(ssid);
    Serial.println("...");

    WiFi.begin(ssid, password);
    int retries = 0;
    while ((WiFi.status() != WL_CONNECTED) && (retries < 15)){
      retries++;
      delay(500);
      Serial.print(".");
    }
    if(retries>14){
      Serial.println(F("WiFi conenction FAILED"));
    }
    if (WiFi.status() == WL_CONNECTED){
      Serial.println(F("WiFi connected!"));
      Serial.println("IP address: ");
      Serial.println(WiFi.localIP());
    }
    Serial.println(F("Setup ready"));
}

// OLD CODE BEGINS HERE ---

/*
 * Get the string URL to post dweet
 */
String getDweetString(){
  int i = 0;
  //use the dweet GET to post to dweet
  String dweetHttpGet="GET /dweet/for/";
  dweetHttpGet=dweetHttpGet+String(thingName)+"?";

  for(i=0;i<(numberVariables);i++){
    if(i==numberVariables-1){
      //the lastone doesnt have a "&" at the end
      dweetHttpGet=dweetHttpGet + String(arrayVariableNames[i]) + "=" + String(arrayVariableValues[i]);
    }
    else
      dweetHttpGet=dweetHttpGet + String(arrayVariableNames[i]) + "="+ String(arrayVariableValues[i]) + "&";
  }
  dweetHttpGet=dweetHttpGet+" HTTP/1.1\r\n"+
               "Host: " +
                 host +
               "\r\n" +
               "Connection: close\r\n\r\n";
  return dweetHttpGet;//this is our freshly made http string request
}

/*
 * Sends the dweet to dweet.io
 */
void sendDweet(){
  WiFiClient client;
  const int httpPort = 80;

  //connect to dweet.io
  if (!client.connect(host, httpPort)){
    Serial.println("connection failed");
    return;
  }
  client.print(getDweetString());
  delay(10); //wait...
  while (client.available()){
    String line = client.readStringUntil('\r');
    Serial.print(line);
  }
  Serial.println();
  Serial.println("closing connection");
}

/*
 * Main loop - runs forever
 */
void loop(){
    ldrData = analogRead(ldr);
    Serial.println(ldrData);

    arrayVariableValues[0] = ldrData;
    arrayVariableNames[0] = "Brightness";

    // display the readings to your serial monitor (locally)
    Serial.print("Sending dweet to ");
    Serial.print(host);
    Serial.print("/follow/");
    Serial.print(thingName);
    Serial.println();

    sendDweet(); //send data to dweet.io
    delay(2000); //refresh rate (send a dweet every 2 seconds...)
  }