WebClient.ino

/****************************************************************************************************************************
  WebClient.ino - Simple Arduino web server sample for ESP8266 AT-command shield
  For ESP8266/ESP32 AT-command running shields

  ESP8266_AT_WebServer is a library for the ESP8266/ESP32 AT-command shields to run WebServer
  Based on and modified from ESP8266 https://github.com/esp8266/Arduino/releases
  Built by Khoi Hoang https://github.com/khoih-prog/ESP8266_AT_WebServer
  Licensed under MIT license
  
  Original author:
  @file       Esp8266WebServer.h
  @author     Ivan Grokhotkov
 *****************************************************************************************************************************/

// Credits of [Miguel Alexandre Wisintainer](https://github.com/tcpipchip) for this simple yet effective method
// For some STM32, there is only definition of Serial in variant.h, and is used for Serial/USB Debugging
// For example, in Nucleo-144 F767ZI original variant.h
//
// #define SERIAL_PORT_MONITOR     Serial
// #define SERIAL_PORT_HARDWARE    Serial
//
// To use ESP8266/ESP32-AT, we need another Serial, such as Serial1
// To do this, first, in corresponding variant.h, modify as follows:

// #define SERIAL_PORT_HARDWARE    Serial1
//
// then assign pins D0 = RX/D1 = TX to be Hardware Serial1 by putting in sketch as follows:
//
// #define EspSerial      SERIAL_PORT_HARDWARE    //Serial1
// HardwareSerial         Serial1(D0, D1);
//
// This must be included in defines.h for each board you'd like to use ESPSerial as Serial1
//
// The pin usage must be modified according to your boards.

#include "defines.h"

int status = WL_IDLE_STATUS;      // the Wifi radio's status

char server[] = "arduino.tips";

// Initialize the Web client object
ESP8266_AT_Client client;

void printWifiStatus()
{
  // print the SSID of the network you're attached to:
  // you're connected now, so print out the data
  Serial.print(F("You're connected to the network, IP = "));
  Serial.println(WiFi.localIP());

  Serial.print(F("SSID: "));
  Serial.print(WiFi.SSID());

  // print the received signal strength:
  int32_t rssi = WiFi.RSSI();
  Serial.print(F(", Signal strength (RSSI): "));
  Serial.print(rssi);
  Serial.println(F(" dBm"));
}

// this method makes a HTTP connection to the server
void httpRequest()
{
  Serial.println();

  // close any connection before send a new request
  // this will free the socket on the WiFi shield
  client.stop();

  // if there's a successful connection
  if (client.connect(server, 80))
  {
    Serial.println(F("Connecting..."));

    // send the HTTP PUT request
    client.println(F("GET /asciilogo.txt HTTP/1.1"));
    client.println(F("Host: arduino.tips"));
    client.println(F("Connection: close"));
    client.println();
  }
  else
  {
    // if you couldn't make a connection
    Serial.println(F("Connection failed"));
  }
}

void setup()
{
  // Open serial communications and wait for port to open:
  Serial.begin(115200);
  while (!Serial && millis() < 5000);

  Serial.print(F("\nStarting WebClient on ")); Serial.print(BOARD_NAME);
  Serial.print(F(" with ")); Serial.println(SHIELD_TYPE); 
  Serial.println(ESP8266_AT_WEBSERVER_VERSION);

  // initialize serial for ESP module
  EspSerial.begin(115200);
  // initialize ESP module
  WiFi.init(&EspSerial);

  Serial.println(F("WiFi shield init done"));

  // check for the presence of the shield
  if (WiFi.status() == WL_NO_SHIELD)
  {
    Serial.println(F("WiFi shield not present"));
    // don't continue
    while (true);
  }

  // attempt to connect to WiFi network
  while ( status != WL_CONNECTED)
  {
    Serial.print(F("Connecting to SSID: "));
    Serial.println(ssid);
    // Connect to WPA/WPA2 network
    status = WiFi.begin(ssid, pass);
  }

  // you're connected now, so print out the data
  printWifiStatus();

  Serial.println();
  Serial.println(F("Starting connection to server..."));

  httpRequest();
}

void printoutData()
{
  // if there are incoming bytes available
  // from the server, read them and print them
  while (client.available())
  {
    char c = client.read();
    Serial.write(c);
  }

  Serial.flush();
}

void loop()
{
  printoutData();
}