Get into hard-to-reach places
The Relay provides a reliable way to reach devices that are unreachable otherwise.
Some environments have highly restricted firewalls and NAT’s. In such an environment, sometimes a direct peer-to-peer connection is impossible. In such scenarios, a Relay can handle communication to and from these devices.
Sometimes you dont want peer-to-peer access to particular devices. Perhaps you want to tightly control the traffic entering and leaving devices in a particular network. Here, a Relay can provide a reliable gateway to control that traffic.