subscribe(cmd, nodeID) {
		const t = this.getTopicName(cmd, nodeID);

		if (this.useLegacy) {
			this.client.subscribe(t, msg => this.receive(cmd, msg));
		} else {
			this.client.subscribe(t, {
				callback: (err, msg) => {
					this.receive(cmd, Buffer.from(msg.data));
				}
			});
		}

		return this.broker.Promise.resolve();
	}
Subscribe to a command

@param {String} cmd
@param {String} nodeID

@memberof NatsTransporter