Erste Schritte Help with websocket protocol implementation

[lomi]

Hello all,

I try to creat a very simple websocket application for a esp32 sensor.

The protocol of the sensor is very easy
1. Connect to ws://IP:654 via websocket client
2. Returned value is "{"type":"Auth"}"
3. Send {"type":"auth", "command":"logmein"}
4. Returned value is "{"type":"Authok"}"
5. Than send a request like "{"type":"sensor", "value":"get"}"
3.returned value is "{"type":"sensor", "value":"55"}"

But I failed already with the first connection
Here is my code

try {
            URI uri;
            uri = new URI("ws://" + ip + ":845");

            try {
                
 webSocketClient.start();
            } catch (Exception e) {
                logger.warn("Web socket start failed", e);
                // throw new IOException("Web socket start failed");
            }

            try {
                Session=webSocketClient
                        .connect(this, uri, new ClientUpgradeRequest()).get();
            } catch (Exception e) {
                logger.warn("Web socket connect failed " + uri.toString(), e);
                // throw new IOException("Web socket start failed");
            }

        } catch (URISyntaxException e) {
            logger.debug("Initialize web socket failed", e);
        }

Used library is
org.eclipse.jetty.websocket.api.Session

Error is
Web socket connect failed " + uri.toString(), e);
Can someone help me please??

 

[kneitzel]

Please give exact error message including the Exception with stacktrace and not just the line where the error occurred.

 

[kneitzel]

And in the text you give the port 654 but in your code you have port 845.

 

[lomi]

Hello,
it's a null pointer exception

Web socket connect failed java.lang.NullPointerException
java.lang.NullPointerException: null

at org.openhab.binding.yioremote.internal.YIOremoteHandler.initialize(YIOremoteHandler.java:102)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.eclipse.smarthome.core.internal.common.AbstractInvocationHandler.invokeDirect(AbstractInvocationHandler.java:152)
    at org.eclipse.smarthome.core.internal.common.Invocation.call(Invocation.java:52)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)

 

[kneitzel]

Just a question: Is it also the same problem as given in https://community.openhab.org/t/help-needed-for-some-basic-websocket-binding/104355?
And your cde is at https://github.com/miloit/openhab-a...remote/bundles/org.openhab.binding.yioremote?

So you rewrote the code already and the problem is gone or different? Just asking to make sure that you still need help and that we do not try to sole no longer existent problems.

 

[lomi]

Problem is gone yes