https://github.com/ethereum/wiki/wiki/JSON-RPC#shh_newfilter

        DEPRECATED

def shh_newFilter(self, to=None, *, topics):
        """https://github.com/ethereum/wiki/wiki/JSON-RPC#shh_newfilter

        DEPRECATED
        """
        obj = {
            'to': to,
            'topics': topics,
        }
        warnings.warn('deprecated', DeprecationWarning)
        return (yield from self.rpc_call('shh_newFilter', [obj]))