epacket: packet: define V0 unversioned frame

Define the V0 unversioned frame type.

Signed-off-by: Jordan Yates <jordan@embeint.com>

Author: JordanYates

src/infuse_iot/epacket/packet.py

@@ -337,18 +337,8 @@ class CtypeForwardHeaderBtGatt(ctypes.LittleEndianStructure):
     _pack_ = 1
 
 
-class CtypeV0VersionedFrame(ctypes.LittleEndianStructure):
-    _fields_ = [
-        ("version", ctypes.c_uint8),
-        ("_type", ctypes.c_uint8),
-        ("flags", ctypes.c_uint16),
-        ("_key_metadata", ctypes.c_uint8 * 3),
-        ("_device_id_upper", ctypes.c_uint32),
-        ("_device_id_lower", ctypes.c_uint32),
-        ("gps_time", ctypes.c_uint32),
-        ("sequence", ctypes.c_uint16),
-        ("entropy", ctypes.c_uint16),
-    ]
+class CtypeV0Frame(ctypes.LittleEndianStructure):
+    _fields_ = []
     _pack_ = 1
 
     @property
@@ -381,6 +371,35 @@ def parse(cls, frame: bytes) -> tuple[Self, int]:
         )
 
 
+class CtypeV0VersionedFrame(CtypeV0Frame):
+    _fields_ = [
+        ("version", ctypes.c_uint8),
+        ("_type", ctypes.c_uint8),
+        ("flags", ctypes.c_uint16),
+        ("_key_metadata", ctypes.c_uint8 * 3),
+        ("_device_id_upper", ctypes.c_uint32),
+        ("_device_id_lower", ctypes.c_uint32),
+        ("gps_time", ctypes.c_uint32),
+        ("sequence", ctypes.c_uint16),
+        ("entropy", ctypes.c_uint16),
+    ]
+    _pack_ = 1
+
+
+class CtypeV0UnversionedFrame(CtypeV0Frame):
+    _fields_ = [
+        ("_type", ctypes.c_uint8),
+        ("flags", ctypes.c_uint16),
+        ("_key_metadata", ctypes.c_uint8 * 3),
+        ("_device_id_upper", ctypes.c_uint32),
+        ("_device_id_lower", ctypes.c_uint32),
+        ("gps_time", ctypes.c_uint32),
+        ("sequence", ctypes.c_uint16),
+        ("entropy", ctypes.c_uint16),
+    ]
+    _pack_ = 1
+
+
 class CtypeSerialFrame(CtypeV0VersionedFrame):
     """Serial packet header"""