Hi,
I want to
observe a resource on a device. I have implemented it such
that when a client registers with the server it starts
observing that resource. I updated code in LeshanServer.java
as follows :
//
Cancel observations on client unregistering
this.clientRegistry.addListener(new
ClientRegistryListener() {
@Override
public void updated(final Client clientUpdated) {
}
@Override
public void unregistered(final Client client) {
SandCLeshanServer.this.observationRegistry.cancelObservations(client);
}
@Override
public void registered(final Client client) {
observeResource(client);
}
});
private
void observeResource(final Client client){
ObserveRequest request = new
ObserveRequest("/500/10/0");
ObserveResponse cResponse = this.send(client,
request);
LOG.debug("cResponse : " + cResponse);
cResponse.getObservation().addListener(new
ObservationListener() {
@Override
public void cancelled(Observation observation) {
LOG.debug("Observation Cancelled ....");
}
@Override
public void newValue(Observation observation,
LwM2mNode value) {
writeToFile(observation, value);
}
});
}
I updated
the oma-objects-spec.json file and the device too has a
resource with that id.
This all works fine with ClientExample. But now that the
actual device is ready to talk to the server, I am not able to
observe the resource.
I see this in the logs :
cResponse : ObserveResponse [code=NOT_FOUND, errormessage=]
I have used
wireshark to find out what is going on with the request. My
guess is that, the client is waiting for an ACK from the
server that it has been registered. But before it gets this
ACK it gets an ObserveRequest instead. And does not accept the
ObserveRequest. Is that correct ?
If that is
the case, which would be a good place to start observing a
resource on a device after the client has registered?
Thanks
