protobuf             - Protobuf and gRPC source files
├── as
│   ├── external
│   │   └── api      - Application Server External API definitions
│   └── integration  - Application Server integration definitions
├── common           - Definitions shared across ChirpStack components
├── geo              - Geolocation Server API definitions
├── gw               - LoRa gateway definitions
├── nc               - Network Controller definitions
└── ns               - Network Server definitions