Provide an example about how to deal with errors.

[hgrecco]

The examples in the repo end with something like:

    let res = listener.listen(|u| {
    })
    if let Err(e) = res {
        println!("An error occured: {}", e);
    }

The easy way to deal with errors is to put a loop around this. But ... what would be the suggested way to do it? For example, it would be nice to retry if a network error occurs but maybe it should fail for other errors.