Seeking assistance regarding the development of the Omron Fins protocol

[rooterWzs]

I have sent a Fins handshake request and received a response in the packet capture tool.
But I still can't accept it in the code. I need your help. Thank you for your time.
Here is my code. github

[chrisdutz]

Is your code availalbe in a PR anywhere?

[rooterWzs]

Sorry, I didn't quite understand your response.

[chrisdutz]

Well I can't tell you what's going wrong based on the screenshot ... do you have all of your code in a branch (ideally with a PR) where I can check it out and have a look?

[chrisdutz]

Oh ... forget it ... it was just pointed out to me that you had the link just at the top ... sorry ... it sort of didn't reach my eye cramped so tightly over the wireshark picture. Will have a look.

[rooterWzs]

sorry, I will write more clearly next time.

[chrisdutz]

Ok ... so it seems that your are successfully sending out a packet (as Wireshark confirms it). However you are getting a timeout (the line 263 in Plc4xNettyWrapper is in the execution of the timeout handler. As you have no "onTimeout" in your sendRequest-handleResponse chain, this simply causes a NPE (Which we should fix).

So unfortunately I can't enlarge the picture of wireshark as GitHub is giving me an error page ... but I assume, you are sending out a packet, to which the remote is not responding. Do you see if there's a reply from the device?

[chrisdutz]

Ok .. I've fixed that glitch in the Plc4xNettyHandler ... however now you would simply not get any error message. I would strongly reccomend you add an onTimeout and onError to your chain to make debugging issues easier.

RequestTransactionManager.RequestTransaction transaction = tm.startRequest();
            transaction.submit(() -> conversationContext.sendRequest(tpktPacket)
                .onTimeout(new TransactionErrorCallback<>(future, transaction))
                .onError(new TransactionErrorCallback<>(future, transaction))
                .expectResponse(TPKTPacket.class, REQUEST_TIMEOUT)
                .unwrap(TPKTPacket::getPayload)
                .only(COTPPacketData.class)
                .unwrap(COTPPacket::getPayload)
                .check(p -> p.getTpduReference() == tpduId)
                .handle(p -> {
                    try {
                        //future.complete(decodeEventSubscriptionRequest(tagName, p, subscriptionRequest));
                        futures.get("DATA_").complete(p);
                    } catch (Exception e) {
                        logger.warn("Error sending 'write' message: '{}'", e.getMessage(), e);
                    }
                    // Finish the request-transaction.
                    transaction.endRequest();
                }));

[rooterWzs]

year . Wireshark screenshot is a handshake message returned to me by PLC.
Thank you. I'll try again.

[rooterWzs]

[chrisdutz]

Having a deeper look at it, according to your mspec, you are sending a FinsHandshakeRequest (0x00000000 response=false) and are getting back something you haven't implemented in your mspec yet 0x00000010 ... so your driver doesn't know how to decode it and probably is throwing an exception internally.