cloudmqtt 0.4.0

A pure Rust MQTT client and server library
Documentation 
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//
//   This Source Code Form is subject to the terms of the Mozilla Public
//   License, v. 2.0. If a copy of the MPL was not distributed with this
//   file, You can obtain one at http://mozilla.org/MPL/2.0/.
//

use clap::Parser;
use cloudmqtt::{
    client::{MqttClient, MqttConnectionParams},
    packet_stream::Acknowledge,
};
use futures::StreamExt;
use mqtt_format::v3::{
    strings::MString, subscription_request::MSubscriptionRequest, will::MLastWill,
};
use tracing::error;
use tracing_subscriber::layer::SubscriberExt;
use tracing_subscriber::util::SubscriberInitExt;

#[derive(Parser, Debug)]
#[clap(author, version, about)]
struct Args {
    #[clap(long, value_parser)]
    addr: String,
    #[clap(long, value_parser)]
    client_id: String,

    #[clap(long, value_parser, required = true)]
    subscriptions: Vec<String>,
}

#[tokio::main]
async fn main() {
    let fmt_layer = tracing_subscriber::fmt::layer()
        .pretty()
        .with_timer(tracing_subscriber::fmt::time::uptime());

    let filter_layer = tracing_subscriber::EnvFilter::from_default_env();

    tracing_subscriber::registry()
        .with(fmt_layer)
        .with(filter_layer)
        .init();

    tracing::info!("Starting up");

    let args = Args::parse();

    let client = MqttClient::connect_v3_unsecured_tcp(
        &args.addr,
        MqttConnectionParams {
            clean_session: false,
            will: Some(MLastWill {
                topic: mqtt_format::v3::strings::MString {
                    value: "hello/world",
                },
                payload: b"I died!",
                qos: mqtt_format::v3::qos::MQualityOfService::AtMostOnce,
                retain: false,
            }),
            username: None,
            password: None,
            keep_alive: 5,
            client_id: mqtt_format::v3::strings::MString {
                value: &args.client_id,
            },
        },
    )
    .await
    .unwrap();

    tokio::spawn(client.heartbeat(None));

    client
        .subscribe(
            &args
                .subscriptions
                .iter()
                .map(|sub| MSubscriptionRequest {
                    topic: MString { value: sub },
                    qos: mqtt_format::v3::qos::MQualityOfService::ExactlyOnce,
                })
                .collect::<Vec<_>>(),
        )
        .await
        .unwrap();

    let packet_stream = client
        .build_packet_stream()
        .with_custom_ack_fn(|packet| async move {
            println!("ACKing packet {packet:?}");
            Acknowledge
        })
        .build();
    let mut packet_stream = Box::pin(packet_stream.stream());

    loop {
        let packet = match packet_stream.next().await {
            Some(Ok(packet)) => packet,
            None => {
                error!("Stream closed unexpectedly");
                break;
            }
            Some(Err(error)) => {
                error!(?error, "Stream errored");
                break;
            }
        };

        let packet = packet.get_packet();
        println!("Received: {packet:#?}");
    }
}