calling stored procedures on remote mysql servers

I cannot find a way to execute a remote stored procedure on mariadb box using either the FederatedX or Connect engines. Is this because there is no way or Google does not have an example?
How else can you build a true distributed system? Is there a third party product that can do this? I mean, from inside a regular, local stored procedure, call and retrieve return data from a stored procedure located in a different server.