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

MQTT client & server for Deno & NodeJS

import { PacketType } from "../deps.js";
/**
 * Handles PUBREC (QoS 2 Publish Received) packets
 * @param ctx - The connection context
 * @param packet - The PUBREC packet received from the client
 * @returns Promise that resolves when handling is complete
 * @description
 * For QoS 2 message flow:
 * 1. Discards the original publish message
 * 2. Stores that PUBREC was received for the packet ID
 * 3. Sends PUBREL packet in response
 */
export async function handlePubrec(ctx, packet) {
    const id = packet.id;
    if (ctx.store?.pendingOutgoing.has(id)) {
        ctx.store.pendingOutgoing.delete(id);
        ctx.store.pendingAckOutgoing.add(id);
        await ctx.send({
            type: PacketType.pubrel,
            id,
        });
    }
}
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