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Arduino - TCP IPv6 Chat Server

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  • Arduino - TCP IPv6 Chat Server

    What is TCP?

    TCP is abbreviation of Transmission Control Protocol. TCP is one of the popular protocols in Internet. To exchange data between two devices using TCP protocol, one device acts as TCP server, the other acts as TCP client. TCP server listens to wait for TCP connection request from TCP client. TCP Client actively make request for TCP connection to TCP server.

    IPv6 is abbreviation of Internet Protocol version 6, the most recent version of the Internet Protocol (IP). IPv6 was developed to deal with the long-anticipated problem of IPv4 address exhaustion.

    This tutorial show how to use Arduino Uno/Mega and PHPoC [WiFi] Shield to create a TCP server that can connect up to 4 TCP clients simultaneously using IPv6.
    It distributes any incoming messages to all connected clients.
    The incoming messages are also printed to the serial monitor.


    Hardware Required


    Circuit
    • Stack PHPoC Shield or PHPoC WiFi Shield on Arduino Uno or Mega

    Note that: Arduino communicates with PHPoC [WiFi] Shield via pins 10, 11, 12 and 13 on the Uno, and pins 10, 50, 51 and 52 on the Mega. Therefore, these pins CANNOT be used for general I/O.



    Install Arduino IDE

    If you have not install Arduino IDE yet, please download and install Arduino IDE .




    Install Library
    • Run Arduino IDE.
    • Navigate to Sketch > Include Library > Manage Libraries

    • Search "Phpoc" on search bar of the Library Manager.

    • Select the PHPoC library and press the [Install] button.

    • Restart Arduino IDE for the next step.


    Setup Network Information
    This part is needed only for the first use.

    1. If Ethernet is used
    In case of using PHPoC Shield (P4S-348), you have two options to connect to network: Ethernet or WiFi.
    If using Ethernet, please follow this instruction to connect the shield to Ethernet.


    2. If WiFi is used
    WiFi is available in both P4S-347 and P4S-348. Please follow:

    Enable IPv6 on PHPoC Shield
    Go to setup page of PHPoC Shield, enable IPv6 and save.


    Note that: In order to connect to IPv6, your LAN/WLAN network MUST support IPv6.



    Source Code
    • Open "ChatServerIPv6" example on Arduino IDE

      Code:
      // Arduino IPv4 & IPv6 Dual Stack Chat Server - 4 Listening Sessions
      //
      // PHPoC Shield and PHPoC WiFi Shield are Internet Shields for Arduino Uno and
      // Mega.
      //
      // This is an example of using Arduino Uno/Mega and PHPoC [WiFi] Shield to
      // create a TCP server that can connect up to 4 TCP clients simultaneously using
      // IPv6. It distributes any incoming messages to all connected clients. The
      // incoming messages are also printed to the serial monitor.
      //
      // Arduino communicates with PHPoC [WiFi] Shield via pins 10, 11, 12 and 13 on
      // the Uno, and pins 10, 50, 51 and 52 on the Mega. Therefore, these pins CANNOT
      // be used for general I/O.
      //
      // This example code was written by Sollae Systems. It is released into the
      // public domain.
      //
      // Tutorial for the example is available here:
      // https://forum.phpoc.com/articles/tutorials/1233-arduino-tcp-ipv6-chat-server
      
      #include <Phpoc.h>
      
      PhpocServer server(23);
      boolean alreadyConnected = false; // whether or not the client was connected previously
      
      void setup() {
        Serial.begin(9600);
        while(!Serial)
          ;
      
        // initialize PHPoC [WiFi] Shield:
        Phpoc.begin(PF_LOG_SPI | PF_LOG_NET);
        //Phpoc.begin();
      
        // initialize IPv6:
        Phpoc.beginIP6();
      
        // start listening for TCP clients:
        server.begin();
      
        // print IP address of PHPoC [WiFi] Shield to serial monitor:
        Serial.print("Chat server address : ");
        Serial.print(Phpoc.localIP());
        Serial.print(' ');
        Serial.print(Phpoc.localIP6());
        Serial.print(' ');
        Serial.print(Phpoc.globalIP6());
        Serial.println();
      }
      
      void loop() {
        // wait for a new client:
        PhpocClient client = server.available();
      
        // when the client sends the first byte, say hello:
        if (client) {
          if (!alreadyConnected) {
            // clear out the transmission buffer:
            client.flush();
            Serial.println("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 all connected clients:
            server.write(thisChar);
            // echo the bytes to the server as well:
            Serial.write(thisChar);
          }
        }
      }
    • The line-by-line explaination of code is presented inside the code.
      For more detail of functions's reference, please refer to PHPoC Shield for Arduino Library Reference
    • Compile the example code and upload to Arduino by clicking "Upload" button on Arduino IDE
    • Open Serial Monitor tool on Arduino IDE to see the output log
    • copy one of two IPv6 addresses (IPv6 link local address or IPv6 global address)



    Test and Result

    In this example, Arduino acts as TCP server. It needs to use TCP client to test. TCP client can be any kind of TCP client software/program on PC or smartphone.
    In this tutorial, I use a Windows-based software, namely ezTerm
    • Open four ezTerm windows
    • Paste IPv6 address of PHPoC Shield and port number (23)
    • Click "Connect" button.
    • Send "Client 1: Hello" message from the 1st ezTerm windows to Arduino.
    • Send "Client 2: Hello" message from the 2nd ezTerm windows to Arduino.
    • Send "Client 3: Hello" message from the 3rd ezTerm windows to Arduino.
    • Send "Client 4: Hello" message from the 4th ezTerm windows to Arduino.
    • We can see the echo message in receiving area of each ezTerm.
    • See echo message in serial monitor



    [See Also



    References
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