Bring up WiFi Hotspot at boot up if no SSID has been previously registered

[mehrdadfeller]

The idea is to let users run Ubo App on bare Raspberry Pi without any added hardware. When they boot up the Pi for the first time, ubo app should put WiFi in hotspot mode IF no WiFi network has been added before and no ethernet cable is connected (no default route), allowing users to connect to Pi to access the web UI. on the Web UI, they should be able to see Ubo GUI and use it to setup WiFi credentials, etc.

[mehrdadfeller]

Note: another complimentary approach is to use GPIO pin connected to the rear panel switch to setup WiFi hotspot. For example, if GPIO is pressed for 3 seconds it will go into Hotspot mode. If user press it 3 times consecutively, it restarted the ubo app. If user holds the button for 5 seconds it restarts the system.