code: def get_bytes(self):
          
  
          ret = struct.pack("<I16s16sQ", client_DH_inner_data.constructor, self.nonce, self.server_nonce,
                             self.retry_id)
  
          bytes_io = BytesIO()
          bytes_io.write(ret)
          serialize_string(bytes_io, self.g_b)
  
          return bytes_io.getvalue()
docs: client_DH_inner_data#6643b654 nonce:int128 server_nonce:int128 retry_id:long g_b:string = Client_DH_Inner_Data