https://doc.akka.io/api/alpakka/current/akka/stream/alpakka/mqtt/streaming/MqttCodec$$UnknownPacketType.html
Alpakka 10.0.4 - akka.stream.alpakka.mqtt.streaming.MqttCodec.UnknownPacketType
Alpakka 10.0.4 - akka.stream.alpakka.mqtt.streaming.MqttCodec.UnknownPacketType
alpakkastreammqtt