What I want to be able to do is while router is working connect mobile with USB cable, turn on tethering in the mobile which starts USB Tethering in the router and off we go - ignoring the WAN cable connection which is internet connected via cable modem.
And then in reverse turn off tethering in the mobile which starts Wired Ethernet in the router and off we go - ignoring the USB Tethering cable connection.
If I change priority order to USB Tethering / Wired Ethernet / 4G Modem / WiFi would that achieve what I have outlined above - that way I can have a cable connected all the time to the router USB port and use either Wired Ethernet data or USB Tethered mobile data, whichever I wish.
I have no knowledge of OpenWRT so this is all new to me, but is quite interesting in what it can do.
Is it possible to set the priorites above in Luci as I have become familiar with it and where stuff is ??