Etherent Serial Client

I am a newbie to Arduino and I’m looking for a little help. Basically I’d like to replace the cable running between two RS232 terminals with and Ethernet convertor using the Arduino to make the switch. The Arduino is also going to need to be smart enough to call the server as in the drawing no matter where I plug it into the Internet.

I have this all working without the Arduino using several computers to the other clients and the server work.

I’m having trouble getting the Arduino to get DHCP address and then star sending data both ways.

I would like some ideas please!

Thanks in advance for help.

basicRS232.png

You don’t show the code that is giving you problems, so no help there. Below is some test code that contains both client and server code that might be of use.

//zoomkat 7-03-12, combined client and server
//simple button GET with iframe code
//for use with IDE 1.0
//open serial monitor and send an g to test client and
//see what the arduino client/server receives
//web page buttons make pin 5 high/low
//use the ' in html instead of " to prevent having to escape the "
//address will look like http://192.168.1.102:84 when submited
//for use with W5100 based ethernet shields
//note that the below bug fix may be required
// http://code.google.com/p/arduino/issues/detail?id=605

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

byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED }; //assign arduino mac address
byte ip[] = { 192, 168, 1, 102 }; // ip in lan assigned to arduino server
byte gateway[] = { 192, 168, 1, 1 }; // internet access via router
byte subnet[] = { 255, 255, 255, 0 }; //subnet mask
EthernetServer server(84); //server port arduino server will use
EthernetClient client;
char serverName[] = "web.comporium.net"; // zoomkat's test web page server
String readString; //used by server to capture GET request 

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

void setup(){

  pinMode(5, OUTPUT); //pin 5 selected to control
  Ethernet.begin(mac,ip,gateway,gateway,subnet); 
  server.begin();
  Serial.begin(9600); 
  Serial.println("server/client 1.0 test 7/03/12"); // keep track of what is loaded
  Serial.println("Send an g in serial monitor to test client"); // what to do to test client
}

void loop(){
  // check for serial input
  if (Serial.available() > 0) 
  {
    byte inChar;
    inChar = Serial.read();
    if(inChar == 'g')
    {
      sendGET(); // call client sendGET function
    }
  }  

  EthernetClient client = server.available();
  if (client) {
    while (client.connected()) {
      if (client.available()) {
        char c = client.read();

        //read char by char HTTP request
        if (readString.length() < 100) {

          //store characters to string 
          readString += c; 
          //Serial.print(c);
        } 

        //if HTTP request has ended
        if (c == '\n') {

          ///////////////
          Serial.println(readString); //print to serial monitor for debuging 

            //now output HTML data header
          if(readString.indexOf('?') >=0) { //don't send new page
            client.println("HTTP/1.1 204 Zoomkat");
            client.println();
            client.println();  
          }
          else {   
            client.println("HTTP/1.1 200 OK"); //send new page on browser request
            client.println("Content-Type: text/html");
            client.println();

            client.println("<HTML>");
            client.println("<HEAD>");
            client.println("<TITLE>Arduino GET test page</TITLE>");
            client.println("</HEAD>");
            client.println("<BODY>");

            client.println("<H1>Zoomkat's simple Arduino 1.0 button</H1>");

            client.println("<a href='/?on' target='inlineframe'>ON</a>"); 
            client.println("<a href='/?off' target='inlineframe'>OFF</a>"); 

            client.println("<IFRAME name=inlineframe style='display:none'>");          
            client.println("</IFRAME>");

            client.println("</BODY>");
            client.println("</HTML>");
          }

          delay(1);
          //stopping client
          client.stop();

          ///////////////////// control arduino pin
          if(readString.indexOf("on") >0)//checks for on
          {
            digitalWrite(5, HIGH);    // set pin 5 high
            Serial.println("Led On");
          }
          if(readString.indexOf("off") >0)//checks for off
          {
            digitalWrite(5, LOW);    // set pin 5 low
            Serial.println("Led Off");
          }
          //clearing string for next read
          readString="";

        }
      }
    }
  }
} 

//////////////////////////
void sendGET() //client function to send and receive GET data from external server.
{
  if (client.connect(serverName, 80)) {
    Serial.println("connected");
    client.println("GET /~shb/arduino.txt HTTP/1.0");
    client.println();
  } 
  else {
    Serial.println("connection failed");
    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();
    Serial.print(c);
  }

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

}

Thanks for the code. It helped me get the thing talking. Obviously I have a lot to learn. The code you sent me appears to work, but it does not shut off the led for some reason.

//zoomkat 7-03-12, combined client and server
//simple button GET with iframe code
//for use with IDE 1.0
//open serial monitor and send an g to test client and
//see what the arduino client/server receives
//web page buttons make pin 5 high/low
//use the ' in html instead of " to prevent having to escape the "
//address will look like http://10.10.0.177:84 when submited
//for use with W5100 based ethernet shields
//note that the below bug fix may be required
// http://code.google.com/p/arduino/issues/detail?id=605

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

byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED }; //assign arduino mac address
byte ip[] = { 10,10,0,177 }; // ip in lan assigned to arduino server
byte gateway[] = { 10,10,0,254 }; // internet access via router
byte subnet[] = { 255, 255, 255, 0 }; //subnet mask
byte mydns[] = { 10,10,0,254}; //dns
EthernetServer server(84); //server port arduino server will use
EthernetClient client;
char serverName[] = "web.comporium.net"; // zoomkat's test web page server
String readString; //used by server to capture GET request 

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

void setup(){

  pinMode(13, OUTPUT); //pin 5 selected to control
  Ethernet.begin(mac,ip,mydns,gateway,subnet); 
  server.begin();
  Serial.begin(9600); 
  Serial.println("server/client 1.0 test 7/03/12"); // keep track of what is loaded
  Serial.println("Send an g in serial monitor to test client"); // what to do to test client
}

void loop(){
  // check for serial input
  if (Serial.available() > 0) 
  {
    byte inChar;
    inChar = Serial.read();
    if(inChar == 'g')
    {
      sendGET(); // call client sendGET function
    }
  }  

  EthernetClient client = server.available();
  if (client) {
    while (client.connected()) {
      if (client.available()) {
        char c = client.read();

        //read char by char HTTP request
        if (readString.length() < 100) {

          //store characters to string 
          readString += c; 
          //Serial.print(c);
        } 

        //if HTTP request has ended
        if (c == '\n') {

          ///////////////
          Serial.println(readString); //print to serial monitor for debuging 

            //now output HTML data header
          if(readString.indexOf('?') >=0) { //don't send new page
            client.println("HTTP/1.1 204 Zoomkat");
            client.println();
            client.println();  
          }
          else {   
            client.println("HTTP/1.1 200 OK"); //send new page on browser request
            client.println("Content-Type: text/html");
            client.println();

            client.println("<HTML>");
            client.println("<HEAD>");
            client.println("<TITLE>Arduino GET test page</TITLE>");
            client.println("</HEAD>");
            client.println("<BODY>");

            client.println("<H1>Zoomkat's simple Arduino 1.0 button</H1>");

            client.println("<a href='/?on' target='inlineframe'>ON</a>"); 
            client.println("<a href='/?off' target='inlineframe'>OFF</a>"); 

            client.println("<IFRAME name=inlineframe style='display:none'>");          
            client.println("</IFRAME>");

            client.println("</BODY>");
            client.println("</HTML>");
          }

          delay(1);
          //stopping client
          client.stop();

          ///////////////////// control arduino pin
          if(readString.indexOf("on") >0)//checks for on
          {
            digitalWrite(13, HIGH);    // set pin 5 high
            Serial.println("Led On");
          }
          if(readString.indexOf("off") >0)//checks for off
          {
            digitalWrite(13, LOW);    // set pin 5 low
            Serial.println("Led Off");
          }
          //clearing string for next read
          readString="";

        }
      }
    }
  }
} 

//////////////////////////
void sendGET() //client function to send and receive GET data from external server.
{
  if (client.connect(serverName, 80)) {
    Serial.println("connected");
    client.println("GET /~shb/arduino.txt HTTP/1.0");
    client.println();
  } 
  else {
    Serial.println("connection failed");
    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();
    Serial.print(c);
  }

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

}

The code you sent me appears to work, but it does not shut off the led for some reason.

You changed something in the code I posted that will not work with when using an ethernet shield. See if you can find what you did.

All I changed was the IP address and the GTY and assigned a dns

sbavington: All I changed was the IP address and the GTY and assigned a dns

I don't know what the "GTY" is, but I think you should keep looking.