expose diagnostics in the client (#167)

matter_server/client/client.py

@@ -29,7 +29,7 @@
     SuccessResultMessage,
 )
 from ..common.models.node import MatterAttribute, MatterNode
-from ..common.models.server_information import ServerInfo
+from ..common.models.server_information import ServerDiagnostics, ServerInfo
 from .const import MIN_SCHEMA_VERSION
 from .exceptions import (
     CannotConnect,
@@ -253,6 +253,11 @@ async def send_command_no_wait(
         )
         await self._send_message(message)
 
+    async def get_diagnostics(self) -> ServerDiagnostics:
+        """Return a full dump of the server (for diagnostics)."""
+        data = await self.send_command(APICommand.SERVER_DIAGNOSTICS)
+        return dataclass_from_dict(ServerDiagnostics, data)
+
     async def connect(self) -> None:
         """Connect to the websocket server."""
         if self._ws_client is not None: