w5500-mqtt

MQTT v5 client for the Wiznet W5500 SPI internet offload chip.

Limitations

This is very basic at the moment, and will be expanded in the future.

• Does not support password protected MQTT servers.
• Only supports QoS 0: At most once delivery.

Example

use w5500_mqtt::{
    ll::{
        net::{Ipv4Addr, SocketAddrV4},
        Sn,
    },
    Client, ClientId, Event, DST_PORT, SRC_PORT,
};

let mut client: Client = Client::new(
    Sn::Sn2,
    SRC_PORT,
    SocketAddrV4::new(Ipv4Addr::new(192, 168, 5, 6), DST_PORT),
);

// wait for a connection or die trying
while !matches!(client.process(&mut w5500, monotonic_secs())?, Event::None) {}

// publish to "duck" with a payload "quack"
client.publish(&mut w5500, "duck", b"quack")?;

// subscribe to "cow"
client.subscribe(&mut w5500, "cow")?;

Relevant Specifications

• MQTT Version 5.0

Feature Flags

All features are disabled by default.

• embedded-hal: Passthrough to w5500-hl.
• std: Passthrough to w5500-hl.
• defmt: Enable logging with defmt. Also a passthrough to w5500-hl.
• log: Enable logging with log.
• w5500-tls: Enable MQTT over TLS.
• p256-cm4: Passthrough to w5500-tls.