WiFiChatServer.ino

/****************************************************************************************************************************
  WiFiChatServer.ino

  A simple server that distributes any incoming messages to all
  connected clients.  To use telnet to  your device's IP address and type.
  You can see the client's input in the serial monitor as well.

  This example is written for a network using WPA encryption. For
  WEP or WPA, change the Wifi.begin() call accordingly.

  Circuit:
   Board with NINA module (Arduino MKR WiFi 1010, MKR VIDOR 4000 and UNO WiFi Rev.2)

  created 18 Dec 2009
  by David A. Mellis
  modified 31 May 2012
  by Tom Igoe

  Based on and modified from WiFiNINA library https://www.arduino.cc/en/Reference/WiFiNINA
  to support nRF52, SAMD21/SAMD51, STM32F/L/H/G/WB/MP1, Teensy, etc. boards besides Nano-33 IoT, MKRWIFI1010, MKRVIDOR400, etc.

  Built by Khoi Hoang https://github.com/khoih-prog/WiFiNINA_Generic
  Licensed under MIT license

  Copyright (c) 2018 Arduino SA. All rights reserved.
  Copyright (c) 2011-2014 Arduino LLC.  All right reserved.

  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.

  This library is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*****************************************************************************************************************************/
#include "defines.h"
#include "arduino_secrets.h"

// To eliminate FW warning when using not latest nina-fw version
// To use whenever WiFi101-FirmwareUpdater-Plugin is not sync'ed with nina-fw version
#define WIFI_FIRMWARE_LATEST_VERSION        "1.4.8"

#include <SPI.h>

#if USING_WIFI101
  #include <WiFi101_Generic.h>
#else
  #include <WiFiNINA_Generic.h>
#endif

///////please enter your sensitive data in the Secret tab/arduino_secrets.h
char ssid[] = SECRET_SSID;        // your network SSID (name)
char pass[] = SECRET_PASS;        // your network password (use for WPA, or use as key for WEP), length must be 8+

int keyIndex = 0;                 // your network key Index number (needed only for WEP)

int status = WL_IDLE_STATUS;

#define TELNET_PORT             23

// telnet defaults to port 23
WiFiServer server(TELNET_PORT);

boolean alreadyConnected = false; // whether or not the client was connected previously

void setup()
{
  //Initialize serial and wait for port to open:
  Serial.begin(115200);

  while (!Serial && millis() < 5000);

  Serial.print(F("\nStart WiFiChatServer on "));
  Serial.println(BOARD_NAME);

// check for the WiFi module:
#if USING_WIFI101
  if (WiFi.status() == WL_NO_SHIELD)
#else
  Serial.println(WIFININA_GENERIC_VERSION);
  
  if (WiFi.status() == WL_NO_MODULE)
#endif
  {
    Serial.println(F("Communication with WiFi module failed!"));

    // don't continue
    while (true);
  }

  String fv = WiFi.firmwareVersion();

  if (fv < WIFI_FIRMWARE_LATEST_VERSION)
  {
    Serial.print(F("Your current firmware NINA FW v"));
    Serial.println(fv);
    Serial.print(F("Please upgrade the firmware to NINA FW v"));
    Serial.println(WIFI_FIRMWARE_LATEST_VERSION);
  }

  // attempt to connect to WiFi network:
  while (status != WL_CONNECTED)
  {
    Serial.print(F("Attempting to connect to open SSID: "));
    Serial.println(ssid);
    // Connect to WPA/WPA2 network. Change this line if using open or WEP network:
    status = WiFi.begin(ssid, pass);

    // wait 10 seconds for connection:
    //delay(10000);
  }

  // start the server:
  server.begin();
  // you're connected now, so print out the status:
  printWiFiStatus();
}

void loop()
{
  // wait for a new client:
  WiFiClient client = server.available();

  // when the client sends the first byte, say hello:
  if (client)
  {
    if (!alreadyConnected)
    {
      // clead out the input buffer:
      client.flush();
      Serial.println(F("We have a new client"));
      client.println("Hello, client!");
      alreadyConnected = true;
    }

    if (client.available() > 0)
    {
      // read the bytes incoming from the client:
      char thisChar = client.read();
      // echo the bytes back to the client:
      server.write(thisChar);
      // echo the bytes to the server as well:
      Serial.write(thisChar);
    }
  }
}

void printWiFiStatus()
{
  // print the SSID of the network you're attached to:
  Serial.print(F("SSID: "));
  Serial.println(WiFi.SSID());

  // print your board's IP address:
  IPAddress ip = WiFi.localIP();
  Serial.print(F("IP Address: "));
  Serial.println(ip);

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