mqrstt 0.1.3

Pure rust MQTTv5 client implementation for Smol, Tokio and soon sync too.
Documentation 
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use async_channel::{Receiver, Sender};

use futures::{select, FutureExt};
use smol::io::{AsyncReadExt, AsyncWriteExt};

use std::time::{Duration, Instant};

use crate::connect_options::ConnectOptions;
use crate::connections::smol_stream::SmolStream;
use crate::error::ConnectionError;
use crate::packets::error::ReadBytes;
use crate::packets::{Packet, PacketType};
use crate::NetworkStatus;

pub struct SmolNetwork<S> {
    network: Option<SmolStream<S>>,

    /// Options of the current mqtt connection
    options: ConnectOptions,

    last_network_action: Instant,
    await_pingresp: Option<Instant>,
    perform_keep_alive: bool,

    network_to_handler_s: Sender<Packet>,

    to_network_r: Receiver<Packet>,
}

impl<S> SmolNetwork<S>
where
    S: AsyncReadExt + AsyncWriteExt + Sized + Unpin,
{
    pub fn new(
        options: ConnectOptions,
        network_to_handler_s: Sender<Packet>,
        to_network_r: Receiver<Packet>,
    ) -> Self {
        Self {
            network: None,

            options,

            last_network_action: Instant::now(),
            await_pingresp: None,
            perform_keep_alive: true,

            network_to_handler_s,
            to_network_r,
        }
    }

    pub fn reset(&mut self) {
        self.network = None;
    }

    pub async fn connect(&mut self, stream: S) -> Result<(), ConnectionError> {
        let (network, connack) = SmolStream::connect(&self.options, stream).await?;

        self.network = Some(network);
        self.network_to_handler_s.send(connack).await?;
        self.last_network_action = Instant::now();
        if self.options.keep_alive_interval_s == 0 {
            self.perform_keep_alive = false;
        }
        Ok(())
    }

    pub async fn run(&mut self) -> Result<NetworkStatus, ConnectionError> {
        if self.network.is_none() {
            return Err(ConnectionError::NoNetwork);
        }

        match self.select().await {
            Ok(NetworkStatus::Active) => Ok(NetworkStatus::Active),
            otherwise => {
                self.reset();
                otherwise
            }
        }
    }

    async fn select(&mut self) -> Result<NetworkStatus, ConnectionError> {
        if self.network.is_none() {
            return Err(ConnectionError::NoNetwork);
        }

        let SmolNetwork {
            network,
            options: _,
            last_network_action,
            await_pingresp,
            perform_keep_alive,
            network_to_handler_s,
            to_network_r,
        } = self;

        let sleep;
        if !(*perform_keep_alive) {
            sleep = Duration::new(3600, 0);
        }
        else if let Some(instant) = await_pingresp {
            sleep =
                *instant + Duration::from_secs(self.options.keep_alive_interval_s) - Instant::now();
        }
        else {
            sleep = *last_network_action + Duration::from_secs(self.options.keep_alive_interval_s)
                - Instant::now();
        }

        if let Some(stream) = network {
            loop {
                select! {
                    _ = stream.read_bytes().fuse() => {
                        match stream.parse_messages(network_to_handler_s).await {
                            Err(ReadBytes::Err(err)) => return Err(err),
                            Err(ReadBytes::InsufficientBytes(_)) => continue,
                            Ok(Some(PacketType::PingResp)) => {
                                *await_pingresp = None;
                                return Ok(NetworkStatus::Active)
                            },
                            Ok(Some(PacketType::Disconnect)) => {
                                return Ok(NetworkStatus::IncomingDisconnect)
                            },
                            Ok(_) => {
                                return Ok(NetworkStatus::Active)
                            }
                        };
                    },
                    outgoing = to_network_r.recv().fuse() => {
                        let packet = outgoing?;
                        stream.write(&packet).await?;
                        *last_network_action = Instant::now();
                        if packet.packet_type() == PacketType::Disconnect{
                            return Ok(NetworkStatus::OutgoingDisconnect);
                        }
                        return Ok(NetworkStatus::Active);
                    },
                    _ = smol::Timer::after(sleep).fuse() => {
                        if await_pingresp.is_none() && *perform_keep_alive{
                            let packet = Packet::PingReq;
                            stream.write(&packet).await?;
                            *last_network_action = Instant::now();
                            *await_pingresp = Some(Instant::now());
                            return Ok(NetworkStatus::Active);
                        }
                        else{
                            return Ok(NetworkStatus::NoPingResp);
                        }
                    },
                }
            }
        }
        else {
            Err(ConnectionError::NoNetwork)
        }
    }
}