I would like to use a RPi 4 as a hotspot. I would like to use the QMI interface rather than PPP because I need the speed. I also would like to be able to use both the Ethernet and 802.11 interfaces. That is, I want to be able to connect to the cellular network with a Raspberry, and then connect to that Raspberry using either Ethernet or WiFi. I will be using SSH, telnet and UDP protocols. I realize I will have to use a network switch or a crossover cable to connect between my PC and the Raspberry.