autohotspot

#!/bin/bash

#This script was created and based on the script made from RaspberryConnect.com
#must be included in copies or derivatives of this script

#A Script to switch between a wifi network or a non internet routed Hotspot
#Works on startup or manually without a reboot or with a timer

#This script is targeted to work with NetworkManager with nmcli commands instead of the traditional raspberry pi network managment


#Device interface name to use, the Default is the wlan0
wifidev="wlan0"

KillHotspot()
{
	echo "Autohotspot shutting down"
	nmcli connection down Hotspot
}



ChkConnectionFiles()
{
#Checks if there are files on the directory
	if [ -n "$(ls -A /etc/NetworkManager/system-connections/ 2>/dev/null)" ]
	then
		echo "contains Files (or is a file)"
	else
		echo "empty (or does not exist)"
	fi

	conReply =$((ls -A /etc/NetworkManager/system-connection | grep -v "Hotspot.nmconnection") 2>&1) >/dev/null 2>&1
	printf '%s\n' "${conReply}"

}


TestSSIDConnection()
{
echo "AutoHotspot"
echo "Initial Testing...."

echo "Testing SSID connection and testing internet connection"
#Check to see what SSID's and MAC addresses are in range
ssidChk=('NoSSid')
sleep 20

nmcli dev wifi rescan

ssidscanreply = $((nmcli -t dev wifi list ) 2>&1 ) > /dev/null 2>&1
printf "%s" "${ssidscanreply[@]}"

ssidreply=$((nmcli -t -f NAME c show --active) 2>&1 ) >/dev/null 2>&1

echo "SSID in range: " $ssidreply

ip4_gateway=$((nmcli -g ip4.GATEWAY c s "$ssidreply") 2>&1) >/dev/null 2>&1
echo "The Gateway: " $ip4_gateway

if [ -z  "$ip4_gateway" ] >/dev/null 2>&1  	#Means this ssid connection has a gateway
then
	echo "There is no ip4 gateway, therefore no ssid at all"
	ssidChk="NoSSid"
	return 0
elif [ "$ssidreply" == "Hotspot" ] >/dev/null 2>&1
then
	echo "The Hotspot is active, the ssid is Hotspot, but ofcourse there is no internet connection"
	ssidChk="Hotspot"
	return 0
else
	echo "There is a ip4 gateway therefore there must exist a valid ssid with internet connection"
	ssidChk="$ssidreply"
	return 0
fi
}

TestSSIDConnection

echo "SSID STATE :" $ssidChk

# Create Hotspot if no connection is available
if [ "$ssidChk" == "NoSSid" ]
then    #No ssid in range, no internet connection, Connect to the Hotspot
	echo "Here Hotspot is not running and there is no internet connection"
	sleep 2
        if nmcli connection show Hotspot >/dev/null 2>&1
        then
        	# A connection with the name Hotspot exists
                # Maybe try and connect to it
                echo "Activating Hotspot"
		nmcli con up Hotspot
		sleep 2
        else
              	#No connection Named Hotspot exists, Creating a Hotspot connection
		echo "Creating a Hotspot connection"
                nmcli dev wifi hotspot iframe wlan0 ssid OctoPrintHotspot password "1234567890"
		sleep 20
		echo "Activating the connection"
		nmcli con up Hotspot
		sleep 2
	fi

fi