The Siemens IAQ Multi-sensor uses Google Protocol Buffer (protobuf) to serialize and encode data that goes into LoRaWAN message payloads. To read data in a format useful to your application, we provide the protobuf files in that describe the implementation. These are required for the serialization and deserialization of the sensor payloads. The main file in the zip package is "SiemensLoRaIAQMessage.proto". This contains the information required to decode the message type and is the parent message of all other message types.

For a general introduction to protobuf, we recommend to refer to the official documentation: Google Protobuf Tutorial, Google Protobuf API Reference.