matterbridge-dyson-robot/dist/dyson-mqtt-filter.js

A Matterbridge plugin that connects Dyson robot vacuums and air treatment devices to the Matter smart home ecosystem via their local or cloud MQTT APIs.

// Matterbridge plugin for Dyson robot vacuum and air treatment devices
// Copyright © 2025 Alexander Thoukydides
import { isDeepStrictEqual } from 'node:util';
// Filter received Dyson MQTT messages for reordering and duplication
export class DysonMQTTFilter {
    log;
    // The most recent message of each type (indexed by msg)
    lastMsg = new Map;
    // Create a new message filter
    constructor(log) {
        this.log = log;
    }
    // Filter a received message
    filter(msg) {
        const lastMsg = this.lastMsg.get(msg.msg);
        if (lastMsg) {
            if (msg.time && lastMsg.time && msg.time < lastMsg.time) {
                return 'reordered';
            }
            if ((msg.time || lastMsg.time) && isDeepStrictEqual(msg, lastMsg)) {
                // (don't filter messages without timestamps)
                return 'duplicate';
            }
        }
        this.lastMsg.set(msg.msg, structuredClone(msg));
    }
}
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