Re: [leshan-dev] Registration Listener

[Simon Bernard <contact@xxxxxxxxxxxxxxx>]

Leshan is just java libraries which help people to develop their own Lightweight M2M server.
It only provides a Java API (for now).
In that case, the clean way should be to use Leshan to develop your Lightweight M2M server and implements your remote API. (e.g. using REST or any other protocols ...)
The leshan-server-demo is an example of this. You could have a look at ClientServlet[1] and EventServlet[2].

Simon

[1]https://github.com/eclipse/leshan/blob/master/leshan-server-demo/src/main/java/org/eclipse/leshan/server/demo/servlet/ClientServlet.java
[2]https://github.com/eclipse/leshan/blob/master/leshan-server-demo/src/main/java/org/eclipse/leshan/server/demo/servlet/EventServlet.java

Le 08/03/2016 18:07, Pablo Punal a écrit :

In that case you need to embedded leshan in your application. But if leshan is running in other machine. How can you use the API?

//pablo

-------- Original message --------
From: Simon Bernard <contact@xxxxxxxxxxxxxxx>
Date: 3/8/2016 18:02 (GMT+01:00)
To: leshan developer discussions <leshan-dev@xxxxxxxxxxx>
Subject: Re: [leshan-dev] Registration Listener

...

Please consider using the Leshan API instead of using this kind of hack.

        // create a server
        LeshanServer server = new LeshanServerBuilder().build();
        server.start();

        // get current registered clients
        Collection<Client> allClients = server.getClientRegistry().allClients();

        // be notified of new registration
        server.getClientRegistry().addListener(new ClientRegistryListener() {
            public void updated(Client client) {
            }

            public void unregistered(Client client) {
            }

            public void registered(Client newClient) {
                System.out.println("New registration:" + newClient);
            }
        });

If you're limited by the current API please open an issue[1].

[1]https://github.com/eclipse/leshan/issues/new

Le 08/03/2016 16:59, Pablo Punal a écrit :

Hi,

You can add a Simple CoAP resource on Leshan and request periodically (also you can implement it with observe). 

Modify "leshan-server-cf/src/main/java/org/eclipse/leshan/server/californium/impl/RegisterResource.java” and add this:

@Override

    public void handleGET(CoapExchange exchange) {

        Request request = exchange.advanced().getRequest();

        Collection<Client> clients = registrationHandler.clientRegistry.allClients();

        ArrayList<JSONObject> clientsArray = new ArrayList<>();

        Client client;

        JSONObject json;

        for(int i=0; i<clients.size(); i++) {

            client = (Client)clients.toArray()[i];

            json = new JSONObject();

            json.put("endPoint", client.getEndpoint());

            json.put("registrationId", client.getRegistrationId());

            json.put("address", client.getAddress().toString());

            json.put("port", client.getPort());

            json.put("objectLinks", Arrays.toString(client.getObjectLinks()));

            clientsArray.add(json);

        }

        String resp = clientsArray.toString();

        exchange.respond(ResponseCode.CONTENT, resp, MediaTypeRegistry.APPLICATION_LINK_FORMAT);

    }

Now you can request to Leshan server for connected devices. In this example you will receive this:

[

1. {
   • "endPoint":"mulle-216",
   • "address":"\/fdfd:0:0:0:0:0:0:1",
   • "objectLinks":"[<\/1\/1>, <\/1\/2>, <\/2\/0>, <\/3\/0>, <\/4\/0>, <\/3311\/0>, <\/3311\/1>]",
   • "port":5683,
   • "registrationId":"3KnmBsPJ8T"
   },
2. {
   • "endPoint":"mulle-248",
   • "address":"\/fdfd:0:0:0:f95e:73b7:a8e7:eeb0",
   • "objectLinks":"[<\/1\/1>, <\/1\/2>, <\/2\/0>, <\/3\/0>, <\/4\/0>, <\/3311\/1>, <\/3311\/2>, <\/3311\/3>, <\/3311\/4>]",
   • "port":5683,
   • "registrationId":"YmDbZUBAph"
   }

]

I implement this on one SCADA system that you can look at: https://github.com/punyal/BlackHole

The code to sniff new devices is at: https://github.com/punyal/BlackHole/blob/master/src/main/java/com/punyal/blackhole/core/net/lwm2m/LWM2Msniffer.java

I hope this help you.

---

Pablo Puñal Pereira
pablo.punal@xxxxxx

-------- Forwarded Message --------

Subject:	Re: [leshan-dev] Registration Listener
Date:	Tue, 8 Mar 2016 11:56:02 +0100
From:	Simon Bernard <contact@xxxxxxxxxxxxxxx>
Reply-To:	leshan developer discussions <leshan-dev@xxxxxxxxxxx>
To:	leshan developer discussions <leshan-dev@xxxxxxxxxxx>

You should have a look at ClientRegistry[1] and ClientRegistryListener[2]

[1]https://github.com/eclipse/leshan/blob/master/leshan-server-core/src/main/java/org/eclipse/leshan/server/client/ClientRegistry.java
[2]https://github.com/eclipse/leshan/blob/master/leshan-server-core/src/main/java/org/eclipse/leshan/server/client/ClientRegistryListener.java

Le 08/03/2016 11:08, Subhash Nair p a écrit :

Hi ,

    I have an idea about using Leshan as Device management server .My Platform does not have a Device Management Capability and so  I am looking for a ways where I can keep Leshan as an external entity to which I can redirect the DM operations.

Whenever  LWM2M  clients are getting registered to the Leshan server  I am looking for a mechanism like where I would implement a Registration Listener in my platform ,   and Leshan will notify this Listener about the registered client and its capabilities.

    

   Such kind of Notification service is there currently.?

Thanks in advance for the advcie .

Regards

Subhash Nair

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