Bounce NetworkManager connections on timeouts

nmcli-bounce.sh

#!/bin/bash

SSID=$1

if [ -z "$SSID" ]; then
    echo "usage: nmcli-bounce SSID"
    exit -1
fi

HOST=cogent.co
SLEEP_AFTER_BOUNCE_S=10
SLEEP_BETWEEN_PINGS_S=1

while true
do
    ping -W 5 -c 1 $HOST > /dev/null
    if [ $? -ne 0 ]; then
        # This should imply an up as well, if NM is set to auto-connect.
        nmcli con down id $SSID

        if [ $? -ne 0 ]; then
            (>&2 echo "nmcli-bounce: failed to bounce $SSID")
        fi
        sleep $SLEEP_AFTER_BOUNCE_S
    fi
    sleep $SLEEP_BETWEEN_PINGS_S
done