return nil
			},
			OutCapacity: 1,
			InCapacity:  1,
		}))
	}
	register(local)
	register(remote)

	// local to remote
	testHandler := func(t *testing.T, handler HandlerID) {
		remoteConn := local.Connection(remoteHost)
		const testPayload = "Hello Grid World!"

		ctx, cancel := context.WithCancel(context.Background())