The latest version I know is version 1.14. I think there must be a new one for the software 2.3.5676, as this release finally include the support for the second battery tower (twin-tower/Doppelturm). For this reason I would expect additional IDs for the second battery tower. As far as I can the values populated by rctclient in a twin-tower setup are the values of the primary battery tower.
The only obvious field in the app is "number of installed battery towers", changing this causes write events on OID 0xbd870886. Having a 2nd tower surely would help :-)
The latest version I know is version 1.14. I think there must be a new one for the software 2.3.5676, as this release finally include the support for the second battery tower (twin-tower/Doppelturm). For this reason I would expect additional IDs for the second battery tower. As far as I can the values populated by rctclient in a twin-tower setup are the values of the primary battery tower.