Central Location for Device Publish Handling

[suyashkumar]

Create a central location where all device publish events are handled and appropriately routed to registered callback functions. Can take the form of a DeviceEventRouter object that has a register function to register functions to be called when publishes happen on the publishString topic.

Every time a publish by a device occurs, the DeviceEventRouter object ensures that the proper registered callback functions get called and/or that the published message gets saved to the db or datastream db.