async function isUsed() {
    return zigbee2mqttManager.gladysConnected && zigbee2mqttManager.zigbee2mqttConnected;
  }
@public
@description Test if Zigbee2mqtt is running.
@returns {Promise<boolean>} Returns true if Z2M is used.
@example
 const used = await gladys.services.zigbee2mqtt.isUsed();