If you add a 2nd hub you have to restart the app to config it. Steps to reproduce.
1) keep UART unplugged, connect one hub
2) open config, create a new config file and scan for devices
3) close config
4) connect second hub
5) open config, create a new config file and scan for devices. only one hub will show up
6) close and relaunch app
7) open config, create a new config file and scan for devices. both hubs should show now
If you add a 2nd hub you have to restart the app to config it. Steps to reproduce. 1) keep UART unplugged, connect one hub 2) open config, create a new config file and scan for devices 3) close config 4) connect second hub 5) open config, create a new config file and scan for devices. only one hub will show up 6) close and relaunch app 7) open config, create a new config file and scan for devices. both hubs should show now