rumqttd 0.20.0

rumqttd is a high performance MQTT broker written in Rust which is light weight and embeddable
Documentation 
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use rumqttd::{Broker, Config, Notification};
use std::{thread, time::Duration};

fn main() {
    pretty_env_logger::init();

    // As examples are compiled as seperate binary so this config is current path dependent. Run it
    // from root of this crate
    let config = config::Config::builder()
        .add_source(config::File::with_name("rumqttd.toml"))
        .build()
        .unwrap();

    let config: Config = config.try_deserialize().unwrap();

    dbg!(&config);

    let mut broker = Broker::new(config);
    let meters = broker.meters().unwrap();

    let (mut link_tx, mut link_rx) = broker.link("consumer").unwrap();
    link_tx.subscribe("hello/+/world").unwrap();
    thread::spawn(move || {
        let mut count = 0;
        loop {
            let notification = match link_rx.recv().unwrap() {
                Some(v) => v,
                None => continue,
            };

            match notification {
                Notification::Forward(forward) => {
                    count += 1;
                    println!(
                        "Topic = {:?}, Count = {}, Payload = {} bytes",
                        forward.publish.topic,
                        count,
                        forward.publish.payload.len()
                    );
                }
                v => {
                    println!("{v:?}");
                }
            }
        }
    });

    for i in 0..5 {
        let client_id = format!("client_{i}");
        let topic = format!("hello/{client_id}/world");
        let payload = vec![0u8; 1_000]; // 0u8 is one byte, so total ~1KB
        let (mut link_tx, _link_rx) = broker.link(&client_id).expect("New link should be made");

        thread::spawn(move || {
            for _ in 0..100 {
                thread::sleep(Duration::from_secs(1));
                link_tx.publish(topic.clone(), payload.clone()).unwrap();
            }
        });
    }

    thread::spawn(move || {
        if let Err(e) = broker.start() {
            println!("Broker stopped: {e}");
        }
    });
    thread::sleep(Duration::from_secs(2));

    loop {
        // Router meters
        if let Ok(v) = meters.recv() {
            println!("{v:#?}");
        }
        thread::sleep(Duration::from_secs(2));
    }
}