International Space Station tracker

#include <Adafruit_SSD1306.h>
#include <splash.h>
#include <Adafruit_GrayOLED.h>
#include <gfxfont.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SPITFT.h>
#include <Adafruit_SPITFT_Macros.h>
#include <SPI.h>
#include <Wire.h>

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64

#define OLED_RESET -1
#define SCREEN_ADDRESS 0x3C
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

#include "USE_ESP8266.h"
#include <TimeLib.h>
char server [] = "api.open-notify.org";
void digitalClockDisplay();

void setup ()
{
display.begin(SSD1306_SWITCHCAPVCC, 0X3C);
display.clearDisplay ();

  Serial.begin(115200);
  if (!configureNetwork()) //start the network
  {
    Serial.println("Failed to configure the network");
    while(1)
    {
      delay(0); //halt; ESP8266 does not like infinity loop without a delay
    }
   }
int ret = client.connect(server, 80);
if (ret == 1)
{
  Serial.println("Connected");
  client.println("GET /iss-now.json HTTP/1.0"); //the http request
  client.print("Host: "); client.println(server);
  client.println("Connection: close");
  client.println();
}
else
{
  Serial.println("Connection failed, error was: ");
  Serial.print(ret, DEC);
  while(1)
  {
    delay(0); //halt; esp8266 does not like infinite loop without a delay
  }
 }
}

char timestampMarker[] = "\"timestamp\":";
char posMarker[] = "\"iss_position\":";

void loop ()
{
  if (client.available())
  {
    String id = client.readStringUntil('"');
    if (id.equals("timestamp")) //start of timestamp
    {
      if (client.find(':')) //a ":" follows each identifier
      {
      unsigned long timestamp = client.parseInt();
      setTime(timestamp);
      digitalClockDisplay();
      
      }
      else
      {
        Serial.println("failed to parse timestamp.");
      }
    }
    if (id.equals("iss_position")) //start of position data
    {
      if (client.find(':')) 
      {
       display.setTextSize(1);
  display.setTextColor(WHITE);
 
  while(client.peek () != '}' && client.find('"')) {
      String id = client.readStringUntil ('"');
      float val = client.parseFloat ();
      client.find ('"');
      Serial.print(id + ":"); Serial.println(val, 4);

      if(id == "longitude"){
         display.setCursor(0,20);
         display.print("longitude:");
         display.setCursor(0,30);
         display.print(val);
      }
      if(id == "latitude"){
         display.setCursor(0,40);
         display.print("latitude:");
         display.setCursor(0,50);
         display.print(val);
      }
  }//end while
  display.display();
      }
      else
      {
        Serial.print("Failed to parse position data.");
      }
    }
  }
if (!client.connected())
  {
    Serial.println();
    Serial.println("disconnecting.");
    client.stop();
    while(1)
  {
    delay (0); //halt, esp8266 does not like loop w/o delay
  }
 }
}
String padDigits(int digit)
{
  String str = String("0") + digit; //put a zero in front of digit
  return str.substring(str.length() - 2);
}

void digitalClockDisplay ()
{
  String datestr = String(year()) + "-" + padDigits(month()) +
                   "-" + padDigits(day());
  String timestr = String(hour()) + ":" + padDigits(minute()) +
                   ":" + padDigits(second());
  Serial.println(datestr + " " + timestr);
 
}