Device listener fails to read Honeynode datastore after receiving notification change

I am trying to do some handling of device notification change in the Device Listener of the networkmodel module.

I am working with emulated Honeynode 1.2.1, and I trigger an <edit-config> netconf operation from an external netconf session. Once this operation is commited, the change is received at the controller, but when I try to retrieve the device configuration I get the errors and warnings obtained in the log attached.

The code written for the device listener is attached as well. 

As far as I understand every time a new device is connected to the controller a new device listener is created to listen to the events triggered from that new device. So, I dont know if I have to add something to the blueprint.xml of the networkmodel module.

Also, the YANG model for the notification change doesn't include any information about the device that sent the notification, but I would like to treat the notifications per device.

I am not very sure about how to target this implementation as I am still getting familiar with opendaylight and transportpce. Any suggestion/feedback will be very helpful.