Currency Exchange Ticker

#include <ESPert.h>

ESPert espert;

const char *host = "api.fixer.io";
const char *mqhost = "www.espert.io";
const char *ssid = "xxxxx"; //change to your own SSID
const char *password = "xxxxxx"; //change to your own password
String smartphone_key = "xxxxxx"; //change to your own smartphone key. Check out www.espert.io
const int httpPort = 80;
const char *path = "/latest?base=SGD";
const int sleepTimeS = 43200; //sleep for 12 hours

void setup() {
  espert.init();
  espert.oled.init();
  delay(2000);

  espert.oled.clear();
  espert.oled.println(espert.info.getId());
  espert.oled.println();

  int mode = espert.wifi.init();

  WiFi.begin (ssid, password);

  if (mode == ESPERT_WIFI_MODE_CONNECT) {
    espert.println(">>> WiFi mode: connected.");
    espert.oled.println("WiFi: connected.");
    espert.oled.print("IP..: ");
    espert.oled.println(espert.wifi.getLocalIP());
  } else if (mode == ESPERT_WIFI_MODE_DISCONNECT) {
    espert.println(">>> WiFi mode: disconnected.");
    espert.oled.println("WiFi: not connected.");
  } else if (mode == ESPERT_WIFI_MODE_SMARTCONFIG) {
    espert.println(">>> WiFi mode: smart config.");
  } else if (mode == ESPERT_WIFI_MODE_SETTINGAP) {
    espert.println(">>> WiFi mode: access point.");
  }
  delay(2000);
}

void loop() {

 String exchange = espert.wifi.getHTTP(host, path); //get exchange rates from api.fixer.io
 
   if (espert.json.init(exchange)) {
    if (espert.json.containsKey("base")) {
      espert.oled.clear();
      espert.oled.println("CURRENCY EXCHANGE");
      espert.oled.print("Base currency:");
      espert.oled.println(espert.json.get("base"));
      espert.oled.print("Date:");
      espert.oled.println(espert.json.get("date"));
    }
   }

 String jsonExchange;
 int jsonIndex;

 for (int i = 0; i < exchange.length(); i++) {
    if (exchange[i] == '{') {
      jsonIndex = i;
      break;
    }
  }

  jsonExchange = exchange.substring(jsonIndex);
  jsonExchange.trim();

  int rateIndexUS = jsonExchange.indexOf("USD");
  int rateIndexINR = jsonExchange.indexOf("INR");
  int rateIndexMYR = jsonExchange.indexOf("MYR");
  int rateIndexTHB = jsonExchange.indexOf("THB");
  
  String priceStringUS = jsonExchange.substring(rateIndexUS + 5, rateIndexUS +11);
  String priceStringMYR = jsonExchange.substring(rateIndexMYR + 5, rateIndexMYR +10);
  String priceStringINR = jsonExchange.substring(rateIndexINR + 5, rateIndexINR +10);
  String priceStringTHB= jsonExchange.substring(rateIndexTHB + 5, rateIndexTHB +10);
  
  priceStringUS.trim();
  priceStringMYR.trim();
  priceStringINR.trim();
  priceStringTHB.trim();
  
  float priceUS = priceStringUS.toFloat();
  float priceINR = priceStringINR.toFloat();
  float priceMYR = priceStringMYR.toFloat();
  float priceTHB = priceStringTHB.toFloat();

  espert.oled.print("USD:");
  espert.oled.println(priceUS);
   espert.oled.print("INR:");
  espert.oled.println(priceINR);
  espert.oled.print("MYR:");
  espert.oled.println(priceMYR);
  espert.oled.print("THB:");
  espert.oled.println(priceTHB);

delay(10000);
    
      String message = "Currency Exchange Rate: SGD/USD: " + (String)(priceUS) + " "+ "SGD/INR: " + (String)(priceINR) + " " + "SGD/MYR: " + (String)(priceMYR) + " " +"SGD/THB:" + (String)(priceTHB);
      message.replace(String(" "), String("%20"));
      String path = "/MySmartphone/send?key=" + smartphone_key + "&message=" + message;
      espert.println(">>" + espert.wifi.getHTTP(mqhost, path.c_str()) + "<<");
      delay(30000);
      espert.oled.clear();
    
  

  ESP.deepSleep(sleepTimeS * 1000000);
}