@seriousme/opifex/dist/server/handlers/handlePubrel.js

MQTT client & server for Deno & NodeJS

import { PacketType } from "../deps.js";
/**
 * Handles PUBREL (QoS 2 publish release) packets
 *
 * @param ctx - The connection context
 * @param packet - The PUBREL packet received from the client
 * @returns Promise that resolves when handling is complete
 * @description
 * For QoS 2 message delivery:
 * 1. Initiates onward delivery of the Application Message
 * 2. Discards the stored message
 * 3. Sends PUBCOMP packet with the Packet Identifier
 */
export async function handlePubrel(ctx, packet) {
    const id = packet.id;
    if (ctx.store?.pendingIncoming.has(id)) {
        const storedPacket = ctx.store.pendingIncoming.get(id);
        if (storedPacket) {
            ctx.persistence.publish(storedPacket.topic, storedPacket);
            ctx.store.pendingIncoming.delete(id);
            await ctx.send({
                type: PacketType.pubcomp,
                id,
            });
        }
    }
}
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