The CHIP src directory is structured as follows:
| File / Folder | Contents |
|---|---|
| app | Application Layer -- Zigbee Cluster Library (ZCL) |
| ble | BLE Layer -- Bluetooth Transport Protocol (BTP) |
| controller | Controller API |
| crypto | Cryptography libraries |
| darwin | Darwin Framework (iOS and macOS) |
| include | Public headers |
| inet | Network Layer -- TCP and UDP endpoints |
| lib | Core and Support libraries |
| lwip | Lightweight IP adaptation (to third_party library) |
| platform | Device Layer -- platform portability adaptations |
| qrcodetool | QR code tool |
| setup_payload | QR code setup data encode / decode library |
| system | System Layer -- common APIs for mem, work, etc. |
| test_driver | Framework for on-device testing |
NFC Tag Reading is disabled by default because a paid Apple developer account is requird to have it enabled. If you want to enable it and you have a paid Apple developer account, go to the CHIPTool iOS target and turn on Near Field Communication Tag Reading under the Capabilities tab.