/**************************************************************
 *
 * To run this tool you need StreamDebugger library:
 *   https://github.com/vshymanskyy/StreamDebugger
 *   or from http://librarymanager/all#StreamDebugger
 *
 * TinyGSM Getting Started guide:
 *   https://tiny.cc/tinygsm-readme
 *
 **************************************************************/

// Select your modem:
//#define TINY_GSM_MODEM_SIM800
// #define TINY_GSM_MODEM_SIM808
// #define TINY_GSM_MODEM_SIM900
#define TINY_GSM_MODEM_SIM7000
// #define TINY_GSM_MODEM_UBLOX
// #define TINY_GSM_MODEM_BG96
// #define TINY_GSM_MODEM_A6
// #define TINY_GSM_MODEM_A7
// #define TINY_GSM_MODEM_M590
// #define TINY_GSM_MODEM_ESP8266
// #define TINY_GSM_MODEM_XBEE

// Increase the buffer
#define TINY_GSM_RX_BUFFER 512

// Define the serial console for debug prints, if needed
//#define TINY_GSM_DEBUG Serial

#include <TinyGsmClient.h>

// Your GPRS credentials
// Leave empty, if missing user or pass
const char apn[]  = "drei.at";
const char user[] = "";
const char pass[] = "";

// Set serial for debug console (to the Serial Monitor, speed 115200)
#define SerialMon Serial

// Set serial for AT commands (to the module)
// Use Hardware Serial on Mega, Leonardo, Micro, Esp32
#include "HardwareSerial.h"
#define SerialAT Serial2

// or Software Serial on Uno, Nano
//#include <SoftwareSerial.h>
//SoftwareSerial SerialAT(2, 3); // RX, TX

#include <StreamDebugger.h>
StreamDebugger debugger(SerialAT, SerialMon);
TinyGsm modem(debugger);

const char server[] = "vsh.pp.ua";
const char resource[] = "/TinyGSM/logo.txt";

const int  port = 80;
TinyGsmClient client(modem);

// For SSL:
//const int  port = 443;
//TinyGsmClientSecure client(modem);

void setup() {
  // Set console baud rate
  Serial.println("Starting Serial");
  SerialMon.begin(115200);
  delay(10);

  // Set GSM module baud rate
  SerialAT.begin(9600);
  delay(3000);
}

void loop() {
  // Restart takes quite some time
  // To skip it, call init() instead of restart()
  SerialMon.print("Initializing modem...");
  if (!modem.restart()) {
    SerialMon.println(F(" [fail]"));
    SerialMon.println(F("************************"));
    SerialMon.println(F(" Is your modem connected properly?"));
    SerialMon.println(F(" Is your serial speed (baud rate) correct?"));
    SerialMon.println(F(" Is your modem powered on?"));
    SerialMon.println(F(" Do you use a good, stable power source?"));
    SerialMon.println(F(" Try useing File -> Examples -> TinyGSM -> tools -> AT_Debug to find correct configuration"));
    SerialMon.println(F("************************"));
    delay(10000);
    return;
  }
  SerialMon.println(F(" [OK]"));

  String modemInfo = modem.getModemInfo();
  SerialMon.print("Modem: ");
  SerialMon.println(modemInfo);

  // Unlock your SIM card with a PIN
  //modem.simUnlock("1234");

  SerialMon.print("Waiting for network...");
  if (!modem.waitForNetwork()) {
    SerialMon.println(F(" [fail]"));
    SerialMon.println(F("************************"));
    SerialMon.println(F(" Is your sim card locked?"));
    SerialMon.println(F(" Do you have a good signal?"));
    SerialMon.println(F(" Is antenna attached?"));
    SerialMon.println(F(" Does the SIM card work with your phone?"));
    SerialMon.println(F("************************"));
    delay(10000);
    return;
  }
  SerialMon.println(F(" [OK]"));

  SerialMon.print("Connecting to ");
  SerialMon.print(apn);
  if (!modem.gprsConnect(apn, user, pass)) {
    SerialMon.println(F(" [fail]"));
    SerialMon.println(F("************************"));
    SerialMon.println(F(" Is GPRS enabled by network provider?"));
    SerialMon.println(F(" Try checking your card balance."));
    SerialMon.println(F("************************"));
    delay(10000);
    return;
  }
  SerialMon.println(F(" [OK]"));

  IPAddress local = modem.localIP();
  SerialMon.print("Local IP: ");
  SerialMon.println(local);

  SerialMon.print(F("Connecting to "));
  SerialMon.print(server);
  if (!client.connect(server, port)) {
    SerialMon.println(F(" [fail]"));
    delay(10000);
    return;
  }
  SerialMon.println(F(" [OK]"));

  // Make a HTTP GET request:
  client.print(String("GET ") + resource + " HTTP/1.0\r\n");
  client.print(String("Host: ") + server + "\r\n");
  client.print("Connection: close\r\n\r\n");

  // Wait for data to arrive
  while (client.connected() && !client.available()) {
    delay(100);
    SerialMon.print('.');
  };
  SerialMon.println();

  // Skip all headers
  client.find("\r\n\r\n");

  // Read data
  unsigned long timeout = millis();
  unsigned long bytesReceived = 0;
  while (client.connected() && millis() - timeout < 10000L) {
    while (client.available()) {
      char c = client.read();
      //SerialMon.print(c);
      bytesReceived += 1;
      timeout = millis();
    }
  }

  client.stop();
  SerialMon.println(F("Server disconnected"));

  modem.gprsDisconnect();
  SerialMon.println(F("GPRS disconnected"));

  SerialMon.println();
  SerialMon.println(F("************************"));
  SerialMon.print  (F(" Received: "));
  SerialMon.print(bytesReceived);
  SerialMon.println(F(" bytes"));
  SerialMon.print  (F(" Test:     "));
  SerialMon.println((bytesReceived == 121) ? "PASSED" : "FAILED");
  SerialMon.println(F("************************"));

  // Do nothing forevermore
  while (true) {
    delay(1000);
  }
}