Arduino: Ethernet TCP Read Sederhana

Sumber: http://forum.arduino.cc/index.php?topic=123756.0

Code

// Hardware
// * Arduino UNO
// * Ethernet Shield
// * pin 4 LED

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

byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED }; //physical mac address
byte ip[] = { 192, 168, 0, 3 }; // ip in lan
byte gateway[] = { 192, 168, 0, 223 }; // internet access via router
byte subnet[] = { 255, 255, 255, 0 }; //subnet mask
EthernetServer server(84);; //server port

String readString; 

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

void setup(){ 

  pinMode(4, OUTPUT); //pin selected to control
  //start Ethernet
  Ethernet.begin(mac, ip, gateway, subnet);
  server.begin();

  //enable serial data print 
  Serial.begin(9600); 
  Serial.println("servertest on"); // so I can keep track of what is loaded
}

void loop(){
  // Create a client connection
  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);
        } 

        //Enter di tekan
        if (c == '\n') { 

          /////////////// 
          Serial.println(readString);

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

          /////////////////////
          if(readString.indexOf("on") >0)//checks for on
          {
            digitalWrite(4, HIGH);    // set pin 4 high
             Serial.println("Led On");
          }
          if(readString.indexOf("off") >0)//checks for off
          {
            digitalWrite(4, LOW);    // set pin 4 low
            Serial.println("Led Off");
          }

          //clearing string for next read
          readString=""; 

        }
      }
    }
  }
}

Laptop

nc 192.168.0.3 84

on
off

Referensi

• http://forum.arduino.cc/index.php?topic=123756.0