Usually devices keep configuration on device itself. In our design only initial configuration is stored on device, which means that there is no need to locally store additional data between restart of a device.
For configuration storage we use config PubSub node of a particular device. This way a change to a configuration
of device, new configuration needs to be published on device configuration node. Updated configuration will be
automatically retrieved by application and applied to particular device without restart of an application.
We decided to keep in configuration all important information, ie. list of nodes device observes, etc. Due to that it is possible to retrieve device configuration in a web based client and change it, ie. to change sensor from which temperature is retrieved to adjust temperature in a room.
Configuration in stored in form of a XEP-0004: Data Forms, which makes it flexible and expandable.
