Could you tell me, or give me some literature, on how the architecture between openHAB 2 and openHAB 1 is distinguished? What are the main differences? I think about more than, there is the possibility of auto discovery and the new Paper UI
In general openHAB 2 is an evolution of openHAB 1. The main technical difference for a start is that the namespace of all the core bundles has changed to org.eclipse.smarthome. Besides this, the architecture stayed as it was. The āevolutionā is then mainly new features that come on top: Like the Things, Discovery, a much improved REST API with SSE, etc.