Reading/writing value from/to a KNX module about calimero-core

[calimero-project]

This is an updated example:

import java.net.InetSocketAddress;

import tuwien.auto.calimero.GroupAddress;
import tuwien.auto.calimero.KNXException;
import tuwien.auto.calimero.link.KNXNetworkLink;
import tuwien.auto.calimero.link.KNXNetworkLinkIP;
import tuwien.auto.calimero.link.medium.TPSettings;
import tuwien.auto.calimero.process.ProcessCommunicator;
import tuwien.auto.calimero.process.ProcessCommunicatorImpl;

/**
 * Example of Calimero process communication, we read and write a boolean datapoint in the KNX network. By default, this
 * example will not change any datapoint value in the network.
 */
public class ProcessCommunication
{
	// Address of your KNXnet/IP server. Replace the IP host or address as necessary.
	private static final String remoteHost = "myKnxServer.myHome.com";

	/**
	 * We will read a boolean from this KNX datapoint group address, replace the address string with one of yours. Make
	 * sure this datapoint exists, otherwise you will get a read timeout!
	 */
	private static final String group = "1/1/1";

	public static void main(final String[] args)
	{
		// Create our network link, and pass it to a process communicator
		try (KNXNetworkLink knxLink = KNXNetworkLinkIP.newTunnelingLink(null, new InetSocketAddress(remoteHost, 3671), false, TPSettings.TP1);
			ProcessCommunicator pc = new ProcessCommunicatorImpl(knxLink)) {

			System.out.println("read a boolean from datapoint " + group);
			// this is a blocking method to read a boolean from a KNX datapoint
			final boolean value = pc.readBool(new GroupAddress(group));
			System.out.println("datapoint " + group + " value: " + value);

			// Uncomment the next line, if you want to write back the same value to the KNX network
			// pc.write(group, value);
		}
		catch (KNXException | InterruptedException e) {
			System.out.println("Error reading KNX datapoint: " + e.getMessage());
		}
	}
}

[JourdanM]

Thanks a lot, it works fine, I'm now able to collect data from differents groups !
When I tried do run my app from the school (directly connected by Wi-Fi on the network), I have a timeout, impossible to connect to the group.
But when I tried from home (connected by VPN), it works fine.

Do you have an idea why ?

[bmalinowsky]

The example probably defaults to the wrong local IP address.
In the method call newTunnelingLink(null, ... , replace the null with new InetSocketAddress("my.local.ip.address", 0), and insert your local IP address of the wifi network.

[JourdanM]

Works well :)
Thank you very much for the help !