Looking at my Ethernet/GSM module I realise that I with a minor change on the backbone pin-out can just add 2.54 pitch screw terminals and we have a stand-alone home sentral with 5V on the upper screw block and RSX on the lower. 5V here is in reality 4.5 to 12V, so we can just add a 2 cell LIPO directly this way. Need to think about this option, but I see no reason not to do the backbone change as this would enable all modules too be used both in rack and stand-alone “as is”.