code: def _receive_all(socket, num_bytes):
      
  
      buffer = ''
      buffer_size = 0
      bytes_left = num_bytes
      while buffer_size < num_bytes:
          data = socket.recv(bytes_left)
          delta = len(data)
          buffer_size += delta
          bytes_left -= delta
          buffer += data
      return buffer
docs: Reads `num_bytes` bytes from the specified socket.
  
      :param socket: open socket instance
      :param num_bytes: number of bytes to read
  
      :return: received data