Connecting pc client to Arduino Ethernet server

Projects Programming
1

Hi all,

I'm programming a tcp/ip pc/arduino project. The Arduino has a ethernetshield and serves as client. The PC runs boost and makes use of the asio library and serves as client.

When i try to connect to the server the connection can not be establised. The server has a network adapter that has the static aderes of 192.168.1.1. And the Arduino has IP adress of 192.168.1.2. The two are directly connected with a UTP cable. Both are using port 5000.

When i ping the arduino from my pc, then that works fine.

For the Arduino code i use a sample program to for testing but this fails. The setup looks like this:

// Enter the IP address of the server you're connecting to:
IPAddress server(192,168,1,1);

// Initialize the Ethernet client library
// with the IP address and port of the server
// that you want to connect to (port 23 is default for telnet;
// if you're using Processing's ChatServer, use port 10002):
EthernetClient client;

void setup() {
// start the Ethernet connection:
Ethernet.begin(mac, ip);
// Open serial communications and wait for port to open:
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for Leonardo only
}

// give the Ethernet shield a second to initialize:
delay(1000);
Serial.println("connecting...");

// if you get a connection, report back via serial:
if (client.connect(server, 5000)) {
Serial.println("connected");
}
else {
// if you didn't get a connection to the server:
Serial.println("connection failed");
}
}

The PC server code is also fairly simple, in a class constructor i do the following:

cout << "Setting up server" << endl;
// Protocol and port
boost::asio::ip::tcp::endpoint Endpoint(boost::asio::ip::tcp::v4(), 5000);

// Create acceptor
boost::asio::ip::tcp::acceptor Acceptor(IOService, Endpoint);

// Create socket
SmartSocket Sock(new boost::asio::ip::tcp::socket(IOService));

cout << "Before accept..." << endl;

// Waiting for client
Acceptor.accept(*Sock);

cout << "Server set up" << endl;

SmartSocket is a typdef:

typedef boost::shared_ptrboost::asio::ip::tcp::socket SmartSocket;

I i start the server the console prints "Before Accept" and waits in the accept function for a incomming client. But when i run my Arduino code then i get connection failed (in the ardunion serial monitor).

Does anybody have some idea's what is going wrong? It seems that the server and client don't see each other. I also put down my firewall but this didn't help. Any comments are usefull!

2

Datoeter:
The two are directly connected with a UTP cable.

That's unusual. I assume you mean a CAT5 or equivalent Ethernet cable. Perhaps your PC's NIC is auto-sensing the polarity, but normally you'd go through a hub or switch which would cross the connection over for you. Do you have access to a hub/switch/router?

3

Basic client test code you can try to check your network connection. Also, read the "how to use this forum" sticky to see how to post code using the # in the tool bar.

//zoomkat 9-22-12
//simple client test
//for use with IDE 1.0.1
//with DNS, DHCP, and Host
//open serial monitor and send an e to test
//for use with W5100 based ethernet shields
//remove SD card if inserted

#include <SPI.h>
#include <Ethernet.h>

byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED }; //physical mac address

char serverName[] = "web.comporium.net"; // zoomkat's test web page server
EthernetClient client;

//////////////////////

void setup(){

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

  Serial.begin(9600); 
  Serial.println("Better client test 9/22/12"); // so I can keep track of what is loaded
  Serial.println("Send an e in serial monitor to test"); // what to do to test
}

void loop(){
  // check for serial input
  if (Serial.available() > 0) //if something in serial buffer
  {
    byte inChar; // sets inChar as a byte
    inChar = Serial.read(); //gets byte from buffer
    if(inChar == 'e') // checks to see byte is an e
    {
      sendGET(); // call sendGET function below when byte is an e
    }
  }  
} 

//////////////////////////

void sendGET() //client function to send/receive GET request data.
{
  if (client.connect(serverName, 80)) {  //starts client connection, checks for connection
    Serial.println("connected");
    client.println("GET /~shb/arduino.txt HTTP/1.1"); //download text
    client.println("Host: web.comporium.net");
    client.println(); //end of get request
  } 
  else {
    Serial.println("connection failed"); //error message if no client connect
    Serial.println();
  }

  while(client.connected() && !client.available()) delay(1); //waits for data
  while (client.connected() || client.available()) { //connected or data available
    char c = client.read(); //gets byte from ethernet buffer
    Serial.print(c); //prints byte to serial monitor 
  }

  Serial.println();
  Serial.println("disconnecting.");
  Serial.println("==================");
  Serial.println();
  client.stop(); //stop client

}
4

Thanks for the comments!

Next time i will format the code accordingly. I have connected the Adruino to my router and used the client test program and that works! (Thanks for that). So i starting to think that my server code on the pc is wrong. I programmed a client (for PC) with it also using boost libraries and that works fine. The connection is accepted. Has anybody used this boost to make a client/server connection with the arduino? Or some other api? Like the winsock api?

I assumed that when using IPv4 that as long as the api supports te protocol then it should be possible to connect to the Arduino ethernetshield.

Does anybody have an idea?

5

Thanks all,

i have fixed the problem, turn out that my firewall of my router was still on.

Many Thanks for the comments.