Add LinkieTransportV2 and basic IOT.IPCAMERA support (#1270)

Add LinkieTransportV2 transport used by kasa cameras and a basic
implementation for IOT.IPCAMERA (kasacam) devices.

---------

Co-authored-by: Zach Price <pricezt@ornl.gov>
Co-authored-by: Steven B <51370195+sdb9696@users.noreply.github.com>
Co-authored-by: Teemu Rytilahti <tpr@iki.fi>

kasa/iot/iotdevice.py

@@ -70,6 +70,16 @@ def _parse_features(features: str) -> set[str]:
     return set(features.split(":"))
 
 
+def _extract_sys_info(info: dict[str, Any]) -> dict[str, Any]:
+    """Return the system info structure."""
+    sysinfo_default = info.get("system", {}).get("get_sysinfo", {})
+    sysinfo_nest = sysinfo_default.get("system", {})
+
+    if len(sysinfo_nest) > len(sysinfo_default) and isinstance(sysinfo_nest, dict):
+        return sysinfo_nest
+    return sysinfo_default
+
+
 class IotDevice(Device):
     """Base class for all supported device types.
 
@@ -304,14 +314,14 @@ class IotDevice(Device):
             _LOGGER.debug("Performing the initial update to obtain sysinfo")
             response = await self.protocol.query(req)
             self._last_update = response
-            self._set_sys_info(response["system"]["get_sysinfo"])
+            self._set_sys_info(_extract_sys_info(response))
 
         if not self._modules:
             await self._initialize_modules()
 
         await self._modular_update(req)
 
-        self._set_sys_info(self._last_update["system"]["get_sysinfo"])
+        self._set_sys_info(_extract_sys_info(self._last_update))
         for module in self._modules.values():
             await module._post_update_hook()
 
@@ -705,10 +715,13 @@ class IotDevice(Device):
     @staticmethod
     def _get_device_type_from_sys_info(info: dict[str, Any]) -> DeviceType:
         """Find SmartDevice subclass for device described by passed data."""
+        if "system" in info.get("system", {}).get("get_sysinfo", {}):
+            return DeviceType.Camera
+
         if "system" not in info or "get_sysinfo" not in info["system"]:
             raise KasaException("No 'system' or 'get_sysinfo' in response")
 
-        sysinfo: dict[str, Any] = info["system"]["get_sysinfo"]
+        sysinfo: dict[str, Any] = _extract_sys_info(info)
         type_: str | None = sysinfo.get("type", sysinfo.get("mic_type"))
         if type_ is None:
             raise KasaException("Unable to find the device type field!")
@@ -728,6 +741,7 @@ class IotDevice(Device):
                 return DeviceType.LightStrip
 
             return DeviceType.Bulb
+
         _LOGGER.warning("Unknown device type %s, falling back to plug", type_)
         return DeviceType.Plug
 
@@ -736,7 +750,7 @@ class IotDevice(Device):
         info: dict[str, Any], discovery_info: dict[str, Any] | None
     ) -> _DeviceInfo:
         """Get model information for a device."""
-        sys_info = info["system"]["get_sysinfo"]
+        sys_info = _extract_sys_info(info)
 
         # Get model and region info
         region = None