Wifi and Hotspot

At home prefer local wifi with endless data. If this is not available connect to a mobile hotspot for online sync.

In file /etc/wpa_supplicant/wpa_supplicant.conf set a priority for local and hotspot wifi:

network={
    ssid="homewifi"
    psk="passwordOfhomewifi"
    priority=10
}
network={
   ssid="mobileexpensivewifi"
   psk="passwordOfmobileexpensivewifi"
   priority=5
}