There is 2 way to be notified of observation.
// listen all observation via the ObservationRegistry
server.getObservationRegistry().addListener(new
ObservationRegistryListener() {
@Override
public void newValue(Observation observation, LwM2mNode value)
{}
@Override
public void cancelled(Observation observation) {}
@Override
public void newObservation(Observation observation) {}
});
// listen a particular observe request (recently added in master)
ObserveRequest request = new ObserveRequest("/3/0/13");
ObserveResponse response = server.send(client, request, TIMEOUT);
response.getObservation().addListener(new ObservationListener() {
@Override
public void newValue(Observation observation, LwM2mNode value)
{}
@Override
public void cancelled(Observation observation) {}
});
Simon
Le 23/10/2015 01:45, Joey Smith a
écrit :
On further
investigation I found that ObservationRegistryListener is
implemented in EventServlet. Looks like the place to record
updates.
Hi
Currently
I am working on proof of concept using Leshan to
recieve log messages from devices on regular
basis. We found that Observe request is the best
way to go for this approach.
So temporarily, since we don't have a custom
object yet(Wakama client not ready yet), on the
server side when the client registers, I observe
resource 15 on Device in LeshanClientExample.
Here is the Observe code in LeshanServer.java:
this.clientRegistry.addListener(new
ClientRegistryListener() {
....
@Override
public void registered(final Client
client) {
// TODO observe the client when it is
registered.
observeResource(client);
}
....
private
void observeResource(final Client client){
ObserveRequest request = new
ObserveRequest("/3/0/15");
LwM2mResponse cResponse =
this.send(client, request);
}
Next
I want to capture the change everytime there is a
change in the resource and record in a database. I
see that in ObjectResource I get content that was
updated (in handleGET()). Is that the correct
place to retrieve updates from ?
I am trying to find out where in the codebase is
the correct place to retrieve updated content ?
Your help will be highly appreciated.
Thanks
J.
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