mqttkit brings Express-like framework to MQTT for Node.js

mqttkit is a new open-source framework that adds an ordered middleware pipeline, typed topic routes, MQTT 5 RPC, and auto-generated AsyncAPI docs on top of any MQTT broker. It plugs into Aedes via an adapter, with support for other brokers planned. The project aims to solve the ad-hoc pattern common in MQTT backends, similar to what Express did for HTTP.