done2 := make(chan struct{})

	p1 := &pipe{
		rdRx: cb1, rdTx: cn1,
		wrTx: cb2, wrRx: cn2,
		localDone: done1, remoteDone: done2,
		readDeadline:  makePipeDeadline(),
		writeDeadline: makePipeDeadline(),
	}
	p2 := &pipe{
		rdRx: cb2, rdTx: cn2,
		wrTx: cb1, wrRx: cn1,
		localDone: done2, remoteDone: done1,
		readDeadline:  makePipeDeadline(),
		writeDeadline: makePipeDeadline(),
	}
	return p1, p2
}

	// local to remote
	remoteConn := local.Connection(remoteHost)
	errFatal(remoteConn.WaitForConnect(context.Background()))
	const testPayload = "Hello Grid World!"

	gotResp := make(chan struct{})
	go func() {
		start := time.Now()
		t.Log("Roundtrip: sending request")
		resp, err := remoteConn.Request(context.Background(), handlerTest, []byte(testPayload))