def setup_privnet(self, host=None):
        """
        Load settings from the privnet JSON config file

        Args:
            host (string, optional): if supplied, uses this IP or domain as neo nodes. The host must
                                     use these standard ports: P2P 20333, RPC 30333.
        """
        self.setup(FILENAME_SETTINGS_PRIVNET)
        if isinstance(host, str):
            if ":" in host:
                raise Exception("No protocol prefix or port allowed in host, use just the IP or domain.")
            print("Using custom privatenet host:", host)
            self.SEED_LIST = ["%s:20333" % host]
            self.RPC_LIST = ["http://%s:30333" % host]
            print("- P2P:", ", ".join(self.SEED_LIST))
            print("- RPC:", ", ".join(self.RPC_LIST))
        self.check_privatenet()
Load settings from the privnet JSON config file

        Args:
            host (string, optional): if supplied, uses this IP or domain as neo nodes. The host must
                                     use these standard ports: P2P 20333, RPC 30333.