ClientWithReconnect.pde

/** ClientWithReconnect.
 
 * /author F. Lee Erickson
 * /date 3 June 2019
 * /brief Send command to socket on server for testing of server coming and going and coming.
 *
 * 25 June 2019. Client try to connect to server and keeps on trying in setup() till success.
 * 26 June 2019. In draw() the Client reconnectes to server.
 * 27 Rename file.  Some clean up on notes.
 * 15 July. Change isconnected to boolean. Update screen prompt when trying to get socket.
 * Change some comments to Doxygen format.
 * Move keypress and mouse press to UserInput tab.  
 * 22 Oct 2019. 
 */

import processing.net.*;  

Client myClient;
final int reconnectPeriod = 3500;  // 3.5 Seconds
int timeReconnect = millis(); 
color myBackground = color(255, 0, 0);
PFont f;                                          // Declare PFont variable

/*Some IP addresses and ports. Comment all but one each. */
//String sIPAddress = "10.1.10.11";// Simple Link STA on LAN
//String sIPAddress = "10.123.45.1";// Simple Link AP Server
String sIPAddress = "127.0.0.1";  //Local host.
int MY_PORT = 23;  //Telnet port even though we are RAW socket.

String s_clientStatus = "Not initilized";
String s_messageServer = "No message";
String s_messageClient = "No message";

boolean isconnected = false;                         // Set zero for false. 1 for true.

void getSocket() {
  /// Tries to open a client network socket connection.
    try {                                // Might through an IOException when connecting to socket.
      myClient = new Client(this, sIPAddress, MY_PORT); // Open client as would Android app port  
      if (myClient.active() == true) {
        isconnected = true; // has become true
        timeReconnect = millis();
      } else {
        text("Look for Socket", 400, 10);
        print("Hr:Min:Seconds = " +hour()+":"+ minute() +":"+ second());
        println(" Looking for server.");
      }// else delay
    }// end of try
    catch (Exception npe) {
      text(("Exception looking for Socket. I got npe= "+npe), 400, 10);
      println ("Some other exception. I got npe= ", npe);
    }//end of catch     
}//GetSocket

void setup() { 
  frameRate(60);
  background (myBackground);  
  size(400, 200); 
  f = createFont("Arial", 6, true);                       // Create Font 
  textAlign(RIGHT);                                     // Credit will be in lower right corner.
  text("Client not Active, Not connected to server: " + sIPAddress+":"+MY_PORT, 400, 10);
  timeReconnect = millis();
}// end of setup. 

void draw() {
  background (myBackground);
  if (isconnected) {
    if (myClient.active() == true) {
      myBackground = color(128, 128, 128); //(128);
      text("Client connected to server: "+sIPAddress+":"+MY_PORT, 400, 10);
      if (myClient.available() > 0) {                   //We have some socket data from server.
        background (0, 0, 255);
        String whatServerSaid = myClient.readString();
        println(whatServerSaid);
        s_messageServer = whatServerSaid;
        s_messageClient = "";
        text("Client: " + s_messageClient, 400, 40);
        text("Server:" + s_messageServer, 400, 20);
      } else {                                          // Connected but no new data.
        myBackground = color(128, 128, 128); //(128);
        background (myBackground);
        text("Client: " + s_messageClient, 400, 40);
        text("Server:" + s_messageServer, 400, 20);
      }
    } else { //Client not active.                      //We need to get a socket again.  
      isconnected = false;                             // Set zero for false
      myBackground = color(255, 0, 0);
      background (myBackground);
      text("Client not Active, Not connected to server: " + sIPAddress+":"+MY_PORT, 400, 10);
      //        timeReconnect = millis();    
      text("Client: " + s_messageClient, 400, 40);
      text("Server:" + s_messageServer, 400, 20);
    }//end Client not active
  } else if (timeReconnect +reconnectPeriod >millis()) {          // Not isconnected
    //Update window
    myBackground = color(0, 64, 0);
    text("Tring to get a socket.", 400, 10);  
    text("Client Connection: "+s_clientStatus, 400, 50);
    text("Client: " + s_messageClient, 400, 40);
    text("Server:" + s_messageServer, 400, 20);                
    println("Tring to get a socket.");
    getSocket();
    isconnected = myClient.active();
    timeReconnect = millis();
  } else {
    myBackground = color(255, 0, 0);
    background (myBackground);
    text("Pause before connecting to server", 400, 10);  
    println("Pause before connecting to server");
    text("Client Connection: "+s_clientStatus, 400, 50);
    text("Client: " + s_messageClient, 400, 40);
    text("Server:" + s_messageServer, 400, 20);  
    getSocket();
  }
} // end of draw.