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Sometimes Ubuntu loses its connection (for example the router goes down), and I want to make sure that it reconnects to the right network. I don't want to just check that there is an internet connection because the modem might be down. I would use this in a script called by cron.
In pseudo code:
if not connected to "wifiname" then
connect to "wifiname".
It should be simple, but most solutions want to check if connected to the Internet, but not a certain network.
Find the name of your configured connection with:
$ ls /etc/NetWorkManager/system-connections/
Replace the My Choice Network with the name of the network you want to connect to.
Run the script. If it's connected to that network, it'll do nothing. If it's not connected to that network it connect to it.
#!/bin/bash
wifiname="My Choice Network"
connectedname="$(nmcli -f active,ssid dev wifi|egrep "yes"|awk '{$1="";print}'|sed "s/^[ \t]*//")"
echo "Connedted: [$connectedname]"
echo "wifiname: [$wifiname]"
if [[ ! "$connectedname" == "$wifiname" ]]; then
nmcli connection up id "$wifiname"
fi
