start.sh

#!/usr/bin/env bash

# https://stackoverflow.com/a/53628882
reboot_countdown () {
    local counter=$1
    while [ 1 ]
    do
        if [ ${counter} -eq 0 ]
        then
            break
        fi
        echo "Rebooting in ${counter} second(s)."
        sleep 1
        counter=$( echo "${counter}-1" | bc )
    done
    reboot
}

# inspired from: https://gist.githubusercontent.com/libbymiller/e8fe6821e122e0a0ac921c8e557320a9/raw/46138fb4d28b494728e66515e46bd7d736b19132/start.sh

# export DBUS_SYSTEM_BUS_ADDRESS=unix:path=/host/run/dbus/system_bus_socket
# ^^^ this can cause barfing and isn't needed

# Choose a condition for running WiFi Connect according to your use case:

# 1. Is there a default gateway?
# ip route | grep default

# 2. Is there Internet connectivity?
# nmcli -t g | grep full

# 3. Is there Internet connectivity via a google ping?
# wget --spider http://google.com 2>&1

# 4. Is there an active WiFi connection?
iwgetid -r

if [ $? -eq 0 ]; then
    printf 'Skipping WiFi Connect\n'
else
    printf 'Starting WiFi Connect\n'
    # Start Wifi Setup wizard. If no response after 30 min, restart.
    wifi-connect -s "MagicMirror WiFi Connect" -a 1800 && reboot_countdown 15
fi