TCP/IP client for Tiva C connected Launchpad

[Echo66 0]

Hello Gentlemen,

 

I'm trying to develop a TCP/IP client with the new TI Connected LaunchPad board but I have some problem with the code that I couldn't figure out and maybe someone can give me a hand, here is the code (based on the Web client example but with some modifications):

#include <Ethernet.h>


// Enter a MAC address for your controller below.

byte mac[] = { 0x00, 0x1F, 0xB0, 0x02, 0xFE, 0x30 };

IPAddress ipLocal(169,254,41,200);

IPAddress server(169,254,41,198);



unsigned int localPort = 8080;      // local port to listen on

char SendBuffer[] = "Something to send\n";        //test data

char ReceiveBuffer[64] = " ";        //receive buffer



// Initialize the Ethernet client library

// with the IP address and port of the server

// that you want to connect to (port 80 is default for HTTP):

EthernetClient client;



void setup() {

 

  //start the Ethernet

  Ethernet.begin(mac,ipLocal, server);

  Ethernet.enableLinkLed();

  Ethernet.enableActivityLed();

 

  //Connect to server

  client.connect(server, localPort);

 

  //start the serial library:

  Serial.begin(9600);

  Serial.println("\n\nTCP/IP Client setup");

  // start the Ethernet connection:

  if (Ethernet.begin(mac) == 0) {

    Serial.println("Failed to configure Ethernet using DHCP");

    // no point in carrying on, so do nothing forevermore:

    while(true);

  }

  // print your local IP address:

  Serial.print("My IP address: ");

  for (byte thisByte = 0; thisByte < 4; thisByte++) {

    // print the value of each byte of the IP address:

    Serial.print(Ethernet.localIP()[thisByte], DEC);

    Serial.print(".");

  }

  Serial.println();

  Serial.print("connecting to server\n");

  //Serial.println(server);

  server.printTo(Serial);





  // if you get a connection, report back via serial:

 

  if (client.connect(server, localPort)) {

    Serial.println("connected to");

    server.printTo(Serial);

    // Make a HTTP request:

    //client.println("GET /search?q=arduino HTTP/1.0");

    //client.println();

  }

  else {

    // kf you didn't get a connection to the server:

    Serial.println("connection failed");

  }

}



void loop()

{

  // if there are incoming bytes available

  // from the server, read them and print them:

  if (client.available()) {

    char c = client.read();

    Serial.print(c);

  }

 

  client.write(SendBuffer);



  // if the server's disconnected, stop the client:

  if (!client.connected()) {

    Serial.println();

    Serial.println("disconnecting.");

    client.stop();



    // do nothing forevermore:

    while(true);

  }

}

//End of code

On the serial monitor it displays "TCP/IP Client setup" then stops, when I try to find the board using "arp -a" command from the windows cmd it shows nothing about the board (neither the MAC nor the IP address I have assigned to it), tried to connect to the board using a small sockets example written in C++ and for sure nothing happened (just to make sure windows networking utilities aren't screwed).  

 

Thanks in advance folks

[jcR 6]

Hello

 

if you have router with DHCP, you can try  Ethernet.begin(0); and not  Ethernet.begin(mac,ipLocal, server);

It's work perfectly !

Do not use:

// start the Ethernet connection:

//  if (Ethernet.begin(mac) == 0) {
//    Serial.println("Failed to configure Ethernet using DHCP");
//    // no point in carrying on, so do nothing forevermore:
//    while(true);

[Echo66 0]

Thanks JCR for the information, quite useful one especially with a newbie to Energia syntax like me, much appreciated.

 

Actually I'm having another problem with this piece of firmware and you might be able to help me solve it, when I turn down the client app on the PC side and re-run it the server isn't able to establish a connection and I need to restart the board to establish a link, though the board is still pingable (still I can ping), have a look on the code and let me know your opinion:

 

#include <Ethernet.h>

#include <EthernetServer.h>

 

EthernetServer server(8888);

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

 

char TxBuffer[15] = "something here\n";

err_t error = 0;

 

void setup() {

  // initialize the ethernet device

  Ethernet.begin(0); 

  // start listening for clients

  server.begin();

  Serial.begin(9600);

  

  Ethernet.enableLinkLed();

  Ethernet.enableActivityLed();

  

  Serial.print("Chat server address:");

  Serial.println(Ethernet.localIP());

}

 

void loop() {

  // wait for a new client:

  EthernetClient 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("We have a new client");

      //client.println("Hello, client!"); 

      alreadyConnected = true;

    } 

 

    if (client.available() > 0) {

      // read the bytes incoming from the client:

      char RxBuffer = client.read();

 

      // echo the bytes back to the client:

      client.println(TxBuffer);

    }

  }

}

 

Thanks again for the help and have a good day.

[jcR 6]

hello

you must read the example: EthernetWebServer.ino  in energia Ethernet  examples.

and in your file you must close the connection in the main Loop:

 

 

void loop(){

  client = server.available();

if (client){

    your program..............

 

    // close the connection:

        client.stop();

}// end if (client)

 

}// end Main Loop

[Echo66 0]

Hello JCR,

 

Sorry for the late reply, first thanks for the help, much appreciated.

Second, it doesn't work, actually if I put the "client.stop()" this way in the code it kills the whole connection with the client.

 

I have tried also the "client.available()" and nothing as well, will keep digging and update the post with anything new.