def get_payload(self):
        """Return Payload."""
        ret = self._software_version
        ret += bytes([self.hardware_version, self.product_group, self.product_type])
        return ret
def get_payload ( self ) : ret = self . _software_version ret += bytes ( [ self . hardware_version , self . product_group , self . product_type ] ) return ret
Return Payload.