Executor devices need to listen to changes of state of sensor devices and adjust state. To do so, executor device reports to application which sensors it want’s to observe and application automatically subscribes to particular nodes. After that every change of state published to nodes observer by device will be received from PubSub component by application, which will decode it from XML payload and will fire event which will be forwarded to executor device. This event will contain important information related to this change, like timestamp, value, unit, etc.
