use rumqttc::{AsyncClient, Event, MqttOptions, Packet, QoS};
use std::time::Duration;
use tokio::time::sleep;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let mut mqttoptions = MqttOptions::new(
        "mqtt-publisher",
        "localhost",
        1883,
    );
    mqttoptions.set_keep_alive(Duration::from_secs(30));

    let (client, mut eventloop) = AsyncClient::new(mqttoptions, 100);

    client
        .publish("test/topic", QoS::AtLeastOnce, false, b"Hello from Rust MQTT!")
        .await?;

    println!("Published message to test/topic");

    loop {
        match eventloop.poll().await {
            Ok(Event::Incoming(Packet::Publish(_))) => {}
            Ok(Event::Incoming(Packet::ConnAck(_))) => {
                println!("Connected to MQTT broker");
            }
            Ok(_) => {}
            Err(e) => {
                println!("Error: {:?}", e);
                sleep(Duration::from_secs(1)).await;
            }
        }
    }
}