Bluetooth Low Energy HIL
```
Application
+------------------------------------------------+
| Applications |
+------------------------------------------------+
Host
+------------------------------------------------+
| Generic Access Profile |
+------------------------------------------------+
+------------------------------------------------+
| Generic Attribute Profile |
+------------------------------------------------+
+--------------------+ +-------------------+
| Attribute Protocol | | Security Mananger |
+--------------------+ +-------------------+
+-----------------------------------------------+
| Logical Link and Adaptation Protocol |
+-----------------------------------------------+
Controller
+--------------------------------------------+
| Host Controller Interface |
+--------------------------------------------+
+------------------+ +------------------+
| Link Layer | | Direct Test Mode |
+------------------+ +------------------+
+--------------------------------------------+
| Physical Layer |
+--------------------------------------------+