def _serialize_value(val, raw: false)
      if !raw && @desc.write_processors?
        val= @desc.pre_process(val)
      end
      val.unpack('C*')
    end
def _serialize_value(val, raw: false)
      if !raw && @desc.write_processors?
        val= @desc.pre_process(val)
      end
      val.unpack('C*')
    end
----------------------------
 Convert Arrays of bytes returned by DBus to Strings of bytes.