getQosLevel static method
Qos conversion, always use this to get a Qos enumeration from a value
Implementation
static MqttQos getQosLevel(int value) {
  switch (value) {
    case 0:
      return MqttQos.atMostOnce;
    case 1:
      return MqttQos.atLeastOnce;
    case 2:
      return MqttQos.exactlyOnce;
    case 0x80:
      return MqttQos.failure;
    default:
      return MqttQos.reserved1;
  }
}