Method ack

webiojs/src/utils.ts:262–268

(seq: number)

    // seq for each ack call must be larger than the previous one, otherwise the ack will be ignored
    ack(seq: number) {
        if (seq < this.seq)
            return;
        let pop_count = seq - this.seq + 1;
        this.queue = this.queue.slice(pop_count);
        this.seq = seq + 1;
    }

    stop() {
        this._stop = true;