Issue with Socket Connection After Serial Port Communication and IP Retrieval

Hi Mikko, Thanks for the suggestion. The IP and port are correct, but in this case, I'm continuously reading data. 

It seems that when I try to connect to the internet (Mobile network), It might be encountering below issue.

java.net.SocketException: Socket operation on nonsocket: socket at java.base/java.net.Socket.createImpl(Socket.java:533) at java.base/java.net.Socket.connect(Socket.java:632) at gurux.net.GXNet.open(GXNet.java:536) at gurux.dlms.client.tcp.TCPConnection.main(TCPConnection.java:70) at gurux.dlms.client.tcp.craeteSerialAndTCP.lambda$1(craeteSerialAndTCP.java:53) at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:539) at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635) at java.base/java.lang.Thread.run(Thread.java:842) 

java.net.SocketException: Socket operation on nonsocket: no further information
	at java.base/sun.nio.ch.IOUtil.configureBlocking(Native Method)
	at java.base/sun.nio.ch.NioSocketImpl.configureNonBlocking(NioSocketImpl.java:224)
	at java.base/sun.nio.ch.NioSocketImpl.connect(NioSocketImpl.java:590)
	at java.base/java.net.SocksSocketImpl.connect(SocksSocketImpl.java:327)
	at java.base/java.net.Socket.connect(Socket.java:633)
	at gurux.net.GXNet.open(GXNet.java:536)
	at gurux.dlms.client.tcp.TCPConnection.main(TCPConnection.java:70)
	at gurux.dlms.client.tcp.craeteSerialAndTCP.lambda$1(craeteSerialAndTCP.java:53)
	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:539)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
	at java.base/java.lang.Thread.run(Thread.java:842)

Could this be related to a network fluctuation or a timeout when switching connections or related to meter connectivity? 

Or, here socket connection is happening with GXNet jar file, Can i create my own socket logic to communicate with meter. If its is possible let me know and explain with simple program to read serial number through TCP. 

BR,

Tharun

Hi Mikko, 

Our meter is using a static IP, so in this case, the meter can initiate the connection to the server. However, when I continuously try to read data, I am getting a socket exception. The IP we are using is obtained via the GXSerial HDLC port. 

The same IP is being used to read the meter information. In this case, I am able to successfully read the data the first time, but on the second attempt, I can retrieve the IP through the port, but when I try to read using the IP, I encounter an exception in below line. 

settings.media.open(); 
Exception is: java.net.SocketException: Socket operation on nonsocket: connect

I observed that once I get the IP, I am trying to ping using the code below. 

 public static boolean pingIPv6(String ipv6Address, int port) {
       try (Socket socket = new Socket()) {
           Inet6Address inetAddress = (Inet6Address) Inet6Address.getByName(ipv6Address);
           InetSocketAddress socketAddress = new InetSocketAddress(inetAddress, port);
           socket.connect(socketAddress, 5000); // Timeout of 5 seconds
           return true; // Connection was successful
       } catch (UnknownHostException e) {
           throw new RuntimeException("Unknown Host: " + ipv6Address);
       } catch (IOException e) {
           throw new RuntimeException("Error connecting to " + ipv6Address + " on port " + port + ": " + e.getMessage());
       }
   }

However, I encountered the following exception. 

1. Error connecting to ip on port no: Socket operation on nonsocket: no further information.
2. Error connecting to ip on port no: Socket operation on nonsocket: connection time out

Based on this, it seems that I am unable to create a socket connection. Is there any issue related to the meter?

BR, 

Tharun

Hi,

I have checked firewall settings, Everything is fine only, I have made TCP connection using below code

          settings.client = new GXDLMSSecureClient2(true);
           GXNet net = null;
           settings.media = new GXNet();
           net = (GXNet) settings.media;
           net.setHostName(args[0]);//enter port name
           net.setPort(1234);
           settings.client.setInterfaceType(InterfaceType.WRAPPER);
           settings.client.setClientAddress(32);
           settings.client.setAuthentication(Authentication.LOW);
           settings.client.setPassword(args[1].getBytes());
           settings.client.getCiphering().getSecurityPolicy().clear();
           settings.client.getCiphering().setSecurity(Security.ENCRYPTION);
           settings.client.getCiphering().setSystemTitle(GXCommon.hexToBytes(args[2]));
         settings.client.getCiphering().setAuthenticationKey(GXCommon.hexToBytes(args[3]));
           settings.client.getCiphering().setBlockCipherKey(GXCommon.hexToBytes(args[4]));
           settings.invocationCounter = args[5];// 0.0.43.1.2.255
           settings.client.setStandard(Standard.INDIA);
           settings.client.setUseUtc2NormalTime(true);
           settings.trace = TraceLevel.VERBOSE;

Here I am connected mobile internet for to create connection between meter and pc.

Once I read data through ip i have close the resource which is followed by gurux sample client code.

    finally {
           try {
               System.out.println("********************** RESOURCE IS CLOSED*********************************");
               if (reader != null) {
                   reader.close();
               }
           } catch (Exception e) {
               System.out.println("Exception in process command: " + e.getMessage());
           }
       }

Now my problem second time when I try to read data through ip, I have got socket exception.

 Note: Here ip I have got through the GXDLMS HDLC port so it can't be wrong.

So kindly check the TCP connection code is there any issue let me know sir.

BR,

Tharun

Hi,

Could you please let me know which Java version is supported for this connection?
In my project I am using java 21. This will help in troubleshooting the issue more effectively.
Please reply ASAP.

BR,
Tharun