I am a real roockie on this but I have managed to implement arduino in a few simple projects so far by reading tutorials and examples but now I am really stuck.
I have spent the whole day trying to get some examples that I can start from but i do not understand where to begin.
My task is to try to send a udp or preferable a tcp packet from my arduino hardware when I push a triggerbutton. The goal is to Control the play function in a mediaplayer by sending a command. (tcp://192.168.0.15:9091/state=play)
I have an arduino uno
an ethernetshield (W5100processor)
and a button connected to pin nr 8 and + 5v I have also a 10k resistor between pin nr8 and ground.
I have understood that i shall include the Ethernet library and how to set the mac and ipadress for the arduino but then I am totally lost.
Is there anyone who can give me a hint on where to start reading or tell me if this is too complicated for me.
Juraj: @horace and @SufferTim, server is some media server, not OP's implementation
perhaps test with a simple UDP server firsy, e.g. in java
// UDPchat.java - simple peer-to-peer chat program using UDP
// - given remote IP address can send strings using UDP datagrams
// - will also wait for datagrams and display contents
// remote IP and port are specified via command line - default IP is 127.0.0.1 (i.e. localhost) and port is 1000
//
// e.g. to send datagrams to IP 146.227.59.130 port 1006
// java chat 146.227.59.130 1006
import java.io.*;
import java.util.*;
import java.net.*;
public class UDPchat extends Thread
{
private final static BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
int port=999;//10001;// 10000; // port to send/receive datagrams on
String remoteIPaddress= "192.168.1.177";//"169.254.144.20";//("192.168.1.8");//127.0.0.1"); // IP to send datagrams
// constructor, parameter is command line parameters
public UDPchat(String args[]) throws Exception
{
// get remote IP address and port from command line parameters
if (args.length > 0) remoteIPaddress = (args[0]); // get IPaddress
if (args.length > 1) port = Integer.parseInt(args[1]); // get port number
System.out.println("chat program: IP address " + InetAddress.getLocalHost().toString() + " port " + port );
start(); // start thread to receive and display datagrams
// loop waiting for keyboard input, send datagram to remote IP
while(true)
try
{
String s = in.readLine(); // read a String
System.out.println("Sending to " + remoteIPaddress + " socket " + port + " data: " + s);
byte[] data = s.getBytes(); // convert to byte array
DatagramSocket theSocket = new DatagramSocket(); // create datagram socket and the datagram
DatagramPacket theOutput = new DatagramPacket(data, s.length(), InetAddress.getByName(remoteIPaddress), port);
theSocket.send(theOutput); // and send the datagram
}
catch (Exception e) {System.out.println("Eroor sending datagram " + e);}
}
// thread run method, receives datagram and display contents as a string
public void run()
{
try
{
// open DatagramSocket to receive
DatagramSocket ds = new DatagramSocket(port);
// loop forever reading datagrams from the DatagramSocket
while (true)
{
byte[] buffer = new byte[65507]; // array to put datagrams in
DatagramPacket dp = new DatagramPacket(buffer, buffer.length); // DatagramPacket to hold the datagram
ds.receive(dp); // wait for next datagram
String s = new String(dp.getData(),0,dp.getLength()); // get contenets as a String
System.out.println("UDP datagram length " + s.length()+ " from IP " + dp.getAddress() + " received: " + s );
s = "Acknowledge\n";
// byte[] data = s.getBytes(); // convert to byte array
// DatagramSocket theSocket = new DatagramSocket(); // create datagram socket and the datagram
// DatagramPacket theOutput = new DatagramPacket(data, data.length, InetAddress.getByName(remoteIPaddress), port);
// theSocket.send(theOutput); // and send the datagram
}
}
catch (SocketException se) {System.err.println("chat error " + se); }
catch (IOException se) {System.err.println("chat error " + se);}
System.exit(1); // exit on error
}
public static void main(String args[]) throws Exception
{
UDPchat c=new UDPchat(args);
}
}
