Sending without receipt to ActiveMQ ends up in closed connection after a timeout

[akamensky]

Running a tcpdump it looks like it does not send any heartbeats if there are no messages, but not sure why if I enable receipt it does not close the connection.

This will result in closed connection panic after 60s:

	for true {
		msg := []byte("test")
		if err := conn.Send(queue, "", msg, stomp.SendOpt.NoContentLength); err != nil {
			panic(err)
		}
		time.Sleep(30 * time.Second)
	}

This will run just fine indefinitely:

	for true {
		msg := []byte("test")
		if err := conn.Send(queue, "", msg, stomp.SendOpt.NoContentLength, stomp.SendOpt.Receipt); err != nil {
			panic(err)
		}
		time.Sleep(30 * time.Second)
	}