def rpcexec(self, payload):
log.debug(json.dumps(payload))<EOL>self.ws.send(json.dumps(payload, ensure_ascii=False).encode("<STR_LIT:utf8>"))<EOL>
Execute a call by sending the payload

            :param dict payload: Payload data
            :raises ValueError: if the server does not respond in proper JSON format
            :raises RPCError: if the server returns an error