code: def shh_post(self, from_=None, to=None, *, topics, payload, priority, ttl):
          
          # FIXME: Not working
          obj = {
              'from': from_,
              'to': to,
              'topics': topics,
              'payload': payload,
              'priority': hex(priority),
              'ttl': hex(ttl),
          }
          return float((yield from self.rpc_call('shh_post', [obj])))
docs: https://github.com/ethereum/wiki/wiki/JSON-RPC#shh_post