| Re: [leshan-dev] Receive Observe notifications |
|
Hi Chris, can you provide the packet captures? I’m really wondering, what’s going on … Yesterday I retested the observe/notify for californium issue #772. https://github.com/eclipse/californium/issues/772#issuecomment-432192214 and it works out of the box. Simon wrote a very good summary of “pain-point” of that observe/notify. https://github.com/eclipse/leshan/wiki/LWM2M-Observe
Did you read that? Without the capture or additional information, it will be hard to help you. May be you better open an issue in the californium github, it’s easier to follow up / track such an issue there than in an e-mail list. https://github.com/eclipse/californium If you open the issue, please really provide the infos requested: LWM2M-server leshan version? LWM2M-client implementation and version? Plain UDP (coap) or DTLS (coaps)? Mit freundlichen Grüßen / Best regards
From: leshan-dev-bounces@xxxxxxxxxxx <leshan-dev-bounces@xxxxxxxxxxx>
On Behalf Of Chris Russo I am building a simple prototype based upon the leshan-server-demo included with the repo. I'm attempting to receive updates from objects that have been observed. Packet captures show that the updates are making their way to the server,
but I'm receiving no notice of them. Seemingly, the best answers I've googled for are from 2015 - but subsequently changes to the Leshan codebase have made the same technique unworkable. I've tried using the ObservationService to add an ObservationListener, but that only seems to alert me when the Observe has been requested, not when the endpoint sends up changed values. static private void attachListener(final LeshanServer server) { System.out.println("Attaching Listener"); server.getObservationService().addListener(new ObservationListener() { @Override public void newObservation(Observation observation, Registration registration) { System.out.println("New Observation"); } @Override public void cancelled(Observation observation) { System.out.println("Observation cancellation"); } @Override public void onResponse(Observation observation, Registration registration, ObserveResponse response) { System.out.println("Observation Response"); } @Override public void onError(Observation observation, Registration registration, Exception error) { System.out.println("Observation Error"); } }); } How should I be listening for observed objects on the Leshan server? Thank you. |