Figure 7
From: Using RELOAD and CoAP for wide area sensor and actuator networking
Delay of establishing CoAP observation relationship. The figure shows the average delay of establishing a CoAP observation relationship. The figure compares four scenarios: (1) RELOAD overlay is used together with dedicated connections for CoAP, (2) RELOAD overlay is used and CoAP signaling is sent tunneled across the overlay, (3) client/server architecture is used and dedicated connections are used for CoAP, and (4) client/server architecture is used and CoAP messages are sent via a central server.