#!/bin/bash
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin

#SCRIPT TO RESTART WIFI ON DISCONNECT
#
# v1.0 - first version
# v1.1 - added ip check at boot and reconnect

echo `date "+%Y-%m-%d %H:%M:%S" | tr -d 'n'` "Reconnection script started."
sleep 10

echo `date "+%Y-%m-%d %H:%M:%S" | tr -d 'n'` "Checking IP..."
phantomjs /home/sigma/router/getcurrentip.js

while :
do
    if ! ifconfig | grep --quiet "192.168.2.200"; then
    echo `date "+%Y-%m-%d %H:%M:%S" | tr -d 'n'` "Not connected, checking if LAN3 network is available..."
    if iwlist wlan0 scan | grep --quiet ""LAN3""; then
        echo `date "+%Y-%m-%d %H:%M:%S" | tr -d 'n'` "Network is available! Restarting WLAN..."
        ifconfig wlan0 down #> /dev/null
        sleep 1
        ifconfig wlan0 up #> /dev/null
        sleep 10
        if ifconfig | grep --quiet "192.168.2.200"; then
        echo `date "+%Y-%m-%d %H:%M:%S" | tr -d 'n'` "Reconnection successful!"
        echo `date "+%Y-%m-%d %H:%M:%S" | tr -d 'n'` "Checking IP..."
        phantomjs /home/sigma/router/getcurrentip.js
        else
        echo `date "+%Y-%m-%d %H:%M:%S" | tr -d 'n'` "Reconnection failed!"
        fi
    else
        echo `date "+%Y-%m-%d %H:%M:%S" | tr -d 'n'` "Network is not available... going to sleep for 20s."
        sleep 20
    fi
    fi
    sleep 10
done

@reboot /bin/bash /home/sigma/wifi/reconnect.sh >> /var/log/wifi_reconnect.log 2>&1

2016-12-10 02:45:43 Reconnection script started.
2016-12-10 02:46:00 Checking IP...
*** Step #1 - Login
  * Get http://192.168.2.1...
  * Got it, skipping internet connection status checks.
  * Login successful.

*** Step #2 - Getting current IP address...
  * Current IP address is: xxx

*** Step #3 - Saving IP address (xxx) ...
  * All done.
(manual router reboot)
2016-12-10 02:46:26 Not connected, checking if LAN3 network is available...
2016-12-10 02:46:26 Network is not available... going to sleep for 20s.
2016-12-10 02:46:56 Not connected, checking if LAN3 network is available...
2016-12-10 02:46:57 Network is not available... going to sleep for 20s.
2016-12-10 02:47:27 Not connected, checking if LAN3 network is available...
2016-12-10 02:47:28 Network is not available... going to sleep for 20s.
2016-12-10 02:47:58 Not connected, checking if LAN3 network is available...
2016-12-10 02:47:58 Network is not available... going to sleep for 20s.
2016-12-10 02:48:28 Not connected, checking if LAN3 network is available...
wlan0     Interface doesn't support scanning : Resource temporarily unavailable

2016-12-10 02:48:28 Network is not available... going to sleep for 20s.

root@sigma:/var/log# ps -auxww | grep "reconnect"
root       474  0.0  0.0   1912   368 ?        Ss   02:45   0:00 /bin/sh -c /bin/bash "/home/sigma/wifi/reconnect.sh" >> /var/log/wifi_reconnect.log 2>&1
root       477  0.0  0.2   4620  2580 ?        S    02:45   0:00 /bin/bash /home/sigma/wifi/reconnect.sh
root      5940  0.0  0.2   4280  2004 pts/1    S+   02:57   0:00 grep reconnect