code: def decode_body(cls, header, f):
          
          assert header.packet_type == MqttControlPacketType.pingresp
  
          if header.remaining_len != 0:
              raise DecodeError('Extra bytes at end of packet.')
  
          return 0, MqttPingresp()
docs: Generates a `MqttPingresp` packet given a
          `MqttFixedHeader`.  This method asserts that header.packet_type
          is `pingresp`.
  
          Parameters
          ----------
          header: MqttFixedHeader
          f: file
              Object with a read method.
  
          Raises
          ------
          DecodeError
              When there are extra bytes at the end of the packet.
  
          Returns
          -------
          int
              Number of bytes consumed from ``f``.
          MqttPingresp
              Object extracted from ``f``.