wifi-connect.sh

#!/bin/bash
#Set the SSID you want to reconnect to when found
timstim=$(date -u)
ssid="AD-INFRA-E1000"
interface="wlan0"
string=$(ifconfig $interface| grep "inet addr:")
if [[ $string == *"inet addr:"* ]]; then
    echo "{\"TIMSTIM\" : \""$timstim"\", \"WIFI\" : [{\"NETWORK_STATE\":\"CONNECTED\"}]}"
else
    echo "{\"TIMSTIM\" : \""$timstim"\", \"WIFI\" : [{\"NETWORK_STATE\":\"DISCONNECTED\"}]}"
    echo "{\"TIMSTIM\" : \""$timstim"\", \"WIFI\" : [{\"NETWORK_STATE\":\"SCANNING\"}]}"
    ssidlist=$(sudo iwlist $interface scan | grep ESSID)
    if [[ "$ssidlist" =~ "$ssid" ]]; then
        sudo ifup --force $interface
        sleep 10
        string=$(ifconfig $interface | grep "inet addr:")
        if [[ $string == *"inet addr:"* ]]; then
            echo "{\"TIMSTIM\" : \""$timstim"\", \"WIFI\" : [{\"NETWORK_STATE\":\"RECONNECTED\"}]}"
        else
            echo  "{\"TIMSTIM\" : \""$timstim"\", \"WIFI\" : [{\"NETWORK_STATE\":\"UNKNOWN_ISSUE_RECONNECTING\"}]}"
        fi
    else
        echo "{\"TIMSTIM\" : \""$timstim"\", \"WIFI\" : [{\"NETWORK_STATE\":\"SSID_NOT_FOUND\"}]}"
        echo "{\"TIMSTIM\" : \""$timstim"\", \"WIFI\" : [{\"NETWORK_STATE\":\"DISCONNECTED\"}]}"
    fi
fi