How can I publish heart beat and receive heart beat

[davidCcD]

In mqttjs, I use heart beat to keep connection alive, code like:

    //  send heart beat which is pingreq
    client.value.on("packetsend", packet => {
      console.log(
        moment().format("YYYY-MM-DD HH:mm:ss") + ` send ${packet.cmd}`
      );
    });
    //  receive heat beat which is pingresp
    client.value.on("packetreceive", packet => {
      console.log(
        moment().format("YYYY-MM-DD HH:mm:ss") + ` receive ${packet.cmd}`
      );
    });

Please let me know, how can I do these in mqtt-vue-hook? Thank you!