Add bounded X4 Bluetooth wake and record Android recovery proof

plugins/insta360-x4/packaging/ble_options.py

@@ -83,6 +83,7 @@ class PacketReader:
 
     def __init__(self):
         self.buffer = bytearray()
+        self.heartbeats = 0
 
     def feed(self, chunk):
         if not chunk or len(self.buffer) + len(chunk) > MAX_PACKET * 2:
@@ -91,12 +92,21 @@ class PacketReader:
         result = []
         while len(self.buffer) >= 4:
             size = struct.unpack_from("<I", self.buffer)[0]
-            if not 16 <= size <= MAX_PACKET:
+            if size != 7 and not 16 <= size <= MAX_PACKET:
                 raise ValueError("Unknown packet framing")
             if len(self.buffer) < size:
                 break
             raw = bytes(self.buffer[:size])
             del self.buffer[:size]
+            if size == 7:
+                # X4 BLE04 capture; SDK CameraSession::Start registers type5
+                # with OnHeartbeatHandler. This is not an Options response.
+                if raw != b"\x07\x00\x00\x00\x05\x00\x00":
+                    raise ValueError("Unsupported short control packet")
+                self.heartbeats += 1
+                if self.heartbeats > 64:
+                    raise ValueError("Heartbeat bound exceeded")
+                continue
             _, kind, reserved, code, content, ident, tail = struct.unpack("<IBHHBIH", raw[:16])
             if kind != 4 or reserved or tail or content != 2 or ident & 0xC0000000 != 0xC0000000:
                 raise ValueError("Unsupported message header/direction/fragmentation")