Function subscribe_with_channel

pub fn subscribe_with_channel<T: Message>(
    topic_name: &str,
    queue_size: usize,
) -> (Receiver<T>, Subscriber)

subscribe ROS message helper

using for inspect specific massage type. Message is displayed on screen and sent to mpsc receiver

Panic!

If subscriber can’t be construct, this function is panic. Or if Roscore is not up, could be panic.