Einrichten AccessPoint  (180430)
======================

apt update
apt upgrade

sudo apt-get install hostapd
   ( zzgl. libnl-route-3-200, hostapd libnl-route-3-200 )
sudo apt-get install dnsmasq
   ( zzgl. dns-root-data dnsmasq-base libmnl0 libnetfilter-conntrack3 )

The installers will have set up the programme so they run when the pi is started. 
For this setup they only need to be started if the home router is not found. 
So automatic startup needs to be disabled. 
This is done with the following commands:

sudo systemctl disable hostapd
(warning:
insserv: warning: current start runlevel(s) (empty) of script `hostapd' overrides LSB defaults (2 3 4 5).
insserv: warning: current stop runlevel(s) (0 1 2 3 4 5 6) of script `hostapd' overrides LSB defaults (0 1 6).
)
sudo systemctl disable dnsmasq
(warning: 
insserv: warning: current start runlevel(s) (empty) of script `dnsmasq' overrides LSB defaults (2 3 4 5).
insserv: warning: current stop runlevel(s) (0 1 2 3 4 5 6) of script `dnsmasq' overrides LSB defaults (0 1 6).
)

Hostapd Configuration
nano /etc/hostapd/hostapd.conf
----- begin
interface=wlan0
ssid=RPI3hot
hw_mode=g
channel=9
wmm_enabled=0
macaddr_acl=0
auth_algs=1
ignore_broadcast_ssid=0
wpa=2
wpa_passphrase=Drdnfss13
wpa_key_mgmt=WPA-PSK
wpa_pairwise=TKIP
rsn_pairwise=CCMP/usr/bin/autohotspot
 

Enter this script. (last modified 30th May 2017)


#!/bin/bash
#RaspberryConnect.com
#Wifi config - if no prefered Wifi generate a hotspot
#This two lines check for any SSIDs in your RPi's wifi settings
wpassid=$(awk '/ssid="/{ print $0 }' /etc/wpa_supplicant/wpa_supplicant.conf | awk -F'ss/usr/bin/autohotspot
 

Enter this script. (last modified 30th May 2017)


#!/bin/bash
#RaspberryConnect.com
#Wifi config - if no prefered Wifi generate a hotspot
#This two lines check for any SSIDs in your RPi's wifi settings
wpassid=$(awk '/ssid="/{ print $0 }' /etc/wpa_supplicant/wpa_supplicant.conf | awk -F'ssid=' '{ print $2 }' ORS=' ' | sed 's/\"/''/g')
ssids=($wpassid)
#or check a restricted list of SSID,s that are setup. 
#Put a # infront of the two lines above first; #ssids=$(awk..... & ssids=($wpassid)
#Enter one or more ssids that are already setup in the wifi settings
#Remove # below to use. separate SSIDs by a space, ('mySSID1' 'mySSID2')/usr/bin/autohotspot
 

Enter this script. (last modified 30th May 2017)


#!/bin/bash
#RaspberryConnect.com
#Wifi config - if no prefered Wifi generate a hotspot
#This two lines check for any SSIDs in your RPi's wifi settings
wpassid=$(awk '/ssid="/{ print $0 }' /etc/wpa_supplicant/wpa_supplicant.conf | awk -F'ssid=' '{ print $2 }' ORS=' ' | sed 's/\"/''/g')
ssids=($wpassid)
#or check a restricted list of SSID,s that are setup. 
#Put a # infront of the two lines above first; #ssids=$(awk..... & ssids=($wpassid)
#Enter one or more ssids that are already setup in the wifi settings
#Remove # below to use. separate SSIDs by a space, ('mySSID1' 'mySSID2')
#ssids=('myssid1')
#Main script
createAdHocNetwork()
{
    ip link set dev wlan0 down
    ip a add 10.0.0.5/24 dev wlan0
    ip link set dev wlan0 up
    systemctl start dnsmasq
    systemctl start hostapd
}/usr/bin/autohotspot
 

Enter this script. (last modified 30th May 2017)


#!/bin/bash
#RaspberryConnect.com
#Wifi config - if no prefered Wifi generate a hotspot
#This two lines check for any SSIDs in your RPi's wifi settings
wpassid=$(awk '/ssid="/{ print $0 }' /etc/wpa_supplicant/wpa_supplicant.conf | awk -F'ssid=' '{ print $2 }' ORS=' ' | sed 's/\"/''/g')
ssids=($wpassid)
#or check a restricted list of SSID,s that are setup. 
#Put a # infront of the two lines above first; #ssids=$(awk..... & ssids=($wpassid)
#Enter one or more ssids that are already setup in the wifi settings
#Remove # below to use. separate SSIDs by a space, ('mySSID1' 'mySSID2')/usr/bin/autohotspot
 

Enter this script. (last modified 30th May 2017)


#!/bin/bash
#RaspberryConnect.com
#Wifi config - if no prefered Wifi generate a hotspot
#This two lines check for any SSIDs in your RPi's wifi settings
wpassid=$(awk '/ssid="/{ print $0 }' /etc/wpa_supplicant/wpa_supplicant.conf | awk -F'ss/usr/bin/autohotspot
 

Enter this script. (last modified 30th May 2017)


#!/bin/bash
#RaspberryConnect.com
#Wifi config - if no prefered Wifi generate a hotspot
#This two lines check for any SSIDs in your RPi's wifi settings
wpassid=$(awk '/ssid="/{ print $0 }' /etc/wpa_supplicant/wpa_supplicant.conf | awk -F'ssid=' '{ print $2 }' ORS=' ' | sed 's/\"/''/g')
ssids=($wpassid)
#or check a restricted list of SSID,s that are setup. 
#Put a # infront of the two lines above first; #ssids=$(awk..... & ssids=($wpassid)
#Enter one or more ssids that are already setup in the wifi settings
#Remove # below to use. separate SSIDs by a space, ('mySSID1' 'mySSID2')
#ssids=('myssid1')
#Main script
createAdHocNetwork()
{
    ip link set dev wlan0 down/usr/bin/autohotspot
 

Enter this script. (last modified 30th May 2017)


#!/bin/bash
#RaspberryConnect.com
#Wifi config - if no prefered Wifi generate a hotspot
#This two lines check for any SSIDs in your RPi's wifi settings
wpassid=$(awk '/ssid="/{ print $0 }' /etc/wpa_supplicant/wpa_supplicant.conf | awk -F'ssid=' '{ print $2 }' ORS=' ' | sed 's/\"/''/g')
ssids=($wpassid)
#or check a restricted list of SSID,s that are setup. 
#Put a # infront of the two lines above first; #ssids=$(awk..... & ssids=($wpassid)
#Enter one or more ssids that are already setup in the wifi settings
#Remove # below to use. separate SSIDs by a space, ('mySSID1' 'mySSID2')
#ssids=('myssid1')
#Main script
createAdHocNetwork()
{
    ip link set dev wlan0 down/usr/bin/autohotspot
 

Enter this script. (last modified 30th May 2017)


#!/bin/bash
#RaspberryConnect.com
#Wifi config - if no prefered Wifi generate a hotspot
#This two lines check for any SSIDs in your RPi's wifi settings
wpassid=$(awk '/ssid="/{ print $0 }' /etc/wpa_supplicant/wpa_supplicant.conf | awk -F'ssid=' '{ print $2 }' ORS=' ' | sed 's/\"/''/g')
ssids=($wpassid)
#or check a restricted list of SSID,s that are setup. 
#Put a # infront of the two lines above first; #ssids=$(awk..... & ssids=($wpassid)
#Enter one or more ssids that are already setup in the wifi settings
#Remove # below to use. separate SSIDs by a space, ('mySSID1' 'mySSID2')
#ssids=('myssid1')
#Main script
createAdHocNetwork()
{
    ip link set dev wlan0 down
    ip a add 10.0.0.5/24 dev wlan0
    ip link set dev wlan0 up
    systemctl start dnsmasq
    systemctl start hostapd
}/usr/bin/autohotspot
 

Enter this script. (last modified 30th May 2017)


#!/bin/bash
#RaspberryConnect.com
#Wifi config - if no prefered Wifi generate a hotspot
#This two lines check for any SSIDs in your RPi's wifi settings
wpassid=$(awk '/ssid="/{ print $0 }' /etc/wpa_supplicant/wpa_supplicant.conf | awk -F'ssid=' '{ print $2 }' ORS=' ' | sed 's/\"/''/g')
ssids=($wpassid)
#or check a restricted list of SSID,s that are setup. 
#Put a # infront of the two lines above first; #ssids=$(awk..... & ssids=($wpassid)
#Enter one or more ssids that are already setup in the wifi settings
#Remove # below to use. separate SSIDs by a space, ('mySSID1' 'mySSID2')/usr/bin/autohotspot
 

Enter this script. (last modified 30th May 2017)

/usr/bin/autohotspot
 

Enter this script. (last modified 30th May 2017)


#!/bin/bash
#RaspberryConnect.com
#Wifi config - if no prefered Wifi generate a hotspot
#This two lines check for any SSIDs in your RPi's wifi settings
wpassid=$(awk '/ssid="/{ print $0 }' /etc/wpa_supplicant/wpa_supplicant.conf | awk -F'ssid=' '{ print $2 }' ORS=' ' | sed 's/\"/''/g')
ssids=($wpassid)
#or check a restricted list of SSID,s that are setup. 
#Put a # infront of the two lines above first; #ssids=$(awk..... & ssids=($wpassid)
#Enter one or more ssids that are already setup in the wifi settings
#Remove # below to use. separate SSIDs by a space, ('mySSID1' 'mySSID2')
#ssids=('myssid1')
#Main script
createAdHocNetwork()
{
    ip link set dev wlan0 down
    ip a add 10.0.0.5/24 dev wlan0
    ip link set dev wlan0 up
    systemctl start dnsmasq
    systemctl start hostapd
}
connected=false
for ssid in "${ssids[@]}"
do
    if iw dev wlan0 scan ap-force | grep "$ssid" > /dev/null
    then
        wpa_supplicant -B -i wlan0 -c /etc/wpa_supplicant/wpa_supplicant.conf > /dev/null 2>&1
        if dhclient -1 wlan0
        then
            connected=true
            break
        else
            wpa_cli terminate
            break
        fi
    else
        echo "Not in range, WiFi with SSID:" $ssid
    fi
done
    if ! $connected; then
    createAdHocNetwork
fi
#!/bin/bash
#RaspberryConnect.com
#Wifi config - if no prefered Wifi generate a hotspot
#This two lines check for any SSIDs in your RPi's wifi settings
wpassid=$(awk '/ssid="/{ print $0 }' /etc/wpa_supplicant/wpa_supplicant.conf | awk -F'ssid=' '{ print $2 }' ORS=' ' | sed 's/\"/''/g')
ssids=($wpassid)
#or check a restricted list of SSID,s that are setup. 
#Put a # infront of the two lines above first; #ssids=$(awk..... & ssids=($wpassid)
#Enter one or more ssids that are already setup in the wifi settings
#Remove # below to use. separate SSIDs by a space, ('mySSID1' 'mySSID2')
#ssids=('myssid1')
#Main script
createAdHocNetwork()
{
    ip link set dev wlan0 down
    ip a add 10.0.0.5/24 dev wlan0
    ip link set dev wlan0 up
    systemctl start dnsmasq
    systemctl start hostapd
}
connected=false
for ssid in "${ssids[@]}"
do
    if iw dev wlan0 scan ap-force | grep "$ssid" > /dev/null
    then
        wpa_supplicant -B -i wlan0 -c /etc/wpa_supplicant/wpa_supplicant.conf > /dev/null 2>&1
        if dhclient -1 wlan0
        then
            connected=true
            break
        else
            wpa_cli terminate
            break
        fi
    else
        echo "Not in range, WiFi with SSID:" $ssid
    fi
done
    if ! $connected; then
    createAdHocNetwork
fi
#ssids=('myssid1')
#Main script
createAdHocNetwork()
{
    ip link set dev wlan0 down
    ip a add 10.0.0.5/24 dev wlan0
    ip link set dev wlan0 up
    systemctl start dnsmasq
    systemctl start hostapd
}
connected=false
for ssid in "${ssids[@]}"
do
    if iw dev wlan0 scan ap-force | grep "$ssid" > /dev/null
    then
        wpa_supplicant -B -i wlan0 -c /etc/wpa_supplicant/wpa_supplicant.conf > /dev/null 2>&1
        if dhclient -1 wlan0
        then
            connected=true
            break
        else
            wpa_cli terminate
            break
        fi
    else
        echo "Not in range, WiFi with SSID:" $ssid
    fi
done
    if ! $connected; then
    createAdHocNetwork
fi
connected=false
for ssid in "${ssids[@]}"
do
    if iw dev wlan0 scan ap-force | grep "$ssid" > /dev/null
    then
        wpa_supplicant -B -i wlan0 -c /etc/wpa_supplicant/wpa_supplicant.conf > /dev/null 2>&1
        if dhclient -1 wlan0
        then
            connected=true
            break
        else
            wpa_cli terminate
            break
        fi
    else
        echo "Not in range, WiFi with SSID:" $ssid
    fi
done
    if ! $connected; then
    createAdHocNetwork
fi
    ip a add 10.0.0.5/24 dev wlan0
    ip link set dev wlan0 up
    systemctl start dnsmasq
    systemctl start hostapd
}
connected=false
for ssid in "${ssids[@]}"
do
    if iw dev wlan0 scan ap-force | grep "$ssid" > /dev/null
    then
        wpa_supplicant -B -i wlan0 -c /etc/wpa_supplicant/wpa_supplicant.conf > /dev/null 2>&1
        if dhclient -1 wlan0
        then
            connected=true
            break
        else
            wpa_cli terminate
            break
        fi
    else
        echo "Not in range, WiFi with SSID:" $ssid
    fi
done
    if ! $connected; then
    createAdHocNetwork
fi
    ip a add 10.0.0.5/24 dev wlan0
    ip link set dev wlan0 up
    systemctl start dnsmasq
    systemctl start hostapd
}
connected=false
for ssid in "${ssids[@]}"
do
    if iw dev wlan0 scan ap-force | grep "$ssid" > /dev/null
    then
        wpa_supplicant -B -i wlan0 -c /etc/wpa_supplicant/wpa_supplicant.conf > /dev/null 2>&1
        if dhclient -1 wlan0
        then
            connected=true
            break
        else
            wpa_cli terminate
            break
        fi
    else
        echo "Not in range, WiFi with SSID:" $ssid
    fi
done
    if ! $connected; then
    createAdHocNetwork
fiid=' '{ print $2 }' ORS=' ' | sed 's/\"/''/g')
ssids=($wpassid)
#or check a restricted list of SSID,s that are setup. 
#Put a # infront of the two lines above first; #ssids=$(awk..... & ssids=($wpassid)
#Enter one or more ssids that are already setup in the wifi settings
#Remove # below to use. separate SSIDs by a space, ('mySSID1' 'mySSID2')
#ssids=('myssid1')
#Main script
createAdHocNetwork()
{
    ip link set dev wlan0 down
    ip a add 10.0.0.5/24 dev wlan0
    ip link set dev wlan0 up
    systemctl start dnsmasq
    systemctl start hostapd
}
connected=false
for ssid in "${ssids[@]}"
do
    if iw dev wlan0 scan ap-force | grep "$ssid" > /dev/null
    then
        wpa_supplicant -B -i wlan0 -c /etc/wpa_supplicant/wpa_supplicant.conf > /dev/null 2>&1
        if dhclient -1 wlan0
        then
            connected=true
            break
        else
            wpa_cli terminate
            break
        fi
    else
        echo "Not in range, WiFi with SSID:" $ssid
    fi
done
    if ! $connected; then
    createAdHocNetwork
fi
#ssids=('myssid1')
#Main script
createAdHocNetwork()
{
    ip link set dev wlan0 down
    ip a add 10.0.0.5/24 dev wlan0
    ip link set dev wlan0 up
    systemctl start dnsmasq
    systemctl start hostapd
}
connected=false
for ssid in "${ssids[@]}"
do
    if iw dev wlan0 scan ap-force | grep "$ssid" > /dev/null
    then
        wpa_supplicant -B -i wlan0 -c /etc/wpa_supplicant/wpa_supplicant.conf > /dev/null 2>&1
        if dhclient -1 wlan0
        then
            connected=true
            break
        else
            wpa_cli terminate
            break
        fi
    else
        echo "Not in range, WiFi with SSID:" $ssid
    fi
done
    if ! $connected; then
    createAdHocNetwork
fi
connected=false
for ssid in "${ssids[@]}"
do
    if iw dev wlan0 scan ap-force | grep "$ssid" > /dev/null
    then
        wpa_supplicant -B -i wlan0 -c /etc/wpa_supplicant/wpa_supplicant.conf > /dev/null 2>&1
        if dhclient -1 wlan0
        then
            connected=true
            break
        else
            wpa_cli terminate
            break
        fi
    else
        echo "Not in range, WiFi with SSID:" $ssid
    fi
done
    if ! $connected; then
    createAdHocNetwork
fi
#ssids=('myssid1')
#Main script
createAdHocNetwork()
{
    ip link set dev wlan0 down
    ip a add 10.0.0.5/24 dev wlan0
    ip link set dev wlan0 up
    systemctl start dnsmasq
    systemctl start hostapd
}
connected=false
for ssid in "${ssids[@]}"
do
    if iw dev wlan0 scan ap-force | grep "$ssid" > /dev/null
    then
        wpa_supplicant -B -i wlan0 -c /etc/wpa_supplicant/wpa_supplicant.conf > /dev/null 2>&1
        if dhclient -1 wlan0
        then
            connected=true
            break
        else
            wpa_cli terminate
            break
        fi
    else
        echo "Not in range, WiFi with SSID:" $ssid
    fi
done
    if ! $connected; then
    createAdHocNetwork
fiid=' '{ print $2 }' ORS=' ' | sed 's/\"/''/g')
ssids=($wpassid)
#or check a restricted list of SSID,s that are setup. 
#Put a # infront of the two lines above first; #ssids=$(awk..... & ssids=($wpassid)
#Enter one or more ssids that are already setup in the wifi settings
#Remove # below to use. separate SSIDs by a space, ('mySSID1' 'mySSID2')
#ssids=('myssid1')
#Main script
createAdHocNetwork()
{
    ip link set dev wlan0 down
    ip a add 10.0.0.5/24 dev wlan0
    ip link set dev wlan0 up
    systemctl start dnsmasq
    systemctl start hostapd
}
connected=false
for ssid in "${ssids[@]}"
do
    if iw dev wlan0 scan ap-force | grep "$ssid" > /dev/null
    then
        wpa_supplicant -B -i wlan0 -c /etc/wpa_supplicant/wpa_supplicant.conf > /dev/null 2>&1
        if dhclient -1 wlan0
        then
            connected=true
            break
        else
            wpa_cli terminate
            break
        fi
    else
        echo "Not in range, WiFi with SSID:" $ssid
    fi
done
    if ! $connected; then
    createAdHocNetwork
fi
----- end

The interface will be wlan0
The driver nl80211 works with the Raspberry Pi 3 onboard WiFi but you will need to check 
that your wifi dongle is compatable 
and can use Access Point mode.
The SSID is the name of the WiFi signal broadcast from the RPi, which you will connect 
to with your Tablet or phones WiFi settings.
Channel can be set between 1 and 13. If you are having trouble connection because of to 
many wifi signals in your area are using channel 6 then try another channel.
Wpa_passphrase is the password you will need to enter when you first connect a device to your 
Raspberry Pi's hotspot.

Now the defaults file needs to be updated to point to where the config file is stored.
In terminal enter the command
sudo nano /etc/default/hostapd

Change:
#DAEMON_CONF=""
to
DAEMON_CONF="/etc/hostapd/hostapd.conf"

And save.

dnsmasq configuration

Next dnsmasq need to be configured to allow the PI to act as a router and issue IP addresses.

sudo nano /etc/dnsmasq.conf

Go to the bottom of the file and add the following lines

#Pi3Hotspot Config
#stop DNSmasq from using resolv.conf
no-resolv
#Interface to use
interface=wlan0
bind-interfaces
dhcp-range=10.0.0.3,10.0.0.20,12h

And then save

Open the interfaces file with the command
   sudo nano /etc/network/interfaces
edit the following lines as below

auto lo wlan0
iface lo inet loopback

allow-hotplug wlan0
iface wlan0 inet manual
# wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf

now save

These details need to be in the wpa_supplicant.conf file to work with this setup.

Add your router details to the wpa_supplicant.conf file with 

sudo nano /etc/wpa_supplicant/wpa_supplicant.conf
and add the following commands to the bottom of the file.

network={
        ssid="mySSID"
        psk="Router Password"
        key_mgmt=WPA-PSK
}

chek you have iw installed with
   dpkg -s iw
If it is not found then install it with
   sudo apt-get install iw

This script will check what routers are available when the RPi. The first router found in the wifi 
settings will be connected to using existing configured WiFi settings. If no know routers are in 
range then a WiFi hotspot is created:

----- begin  /usr/bin/autohotspot
#!/bin/bash
#RaspberryConnect.com
#Wifi config - if no prefered Wifi generate a hotspot
#This two lines check for any SSIDs in your RPi's wifi settings
wpassid=$(awk '/ssid="/{ print $0 }' /etc/wpa_supplicant/wpa_supplicant.conf | awk -F'ssid=' '{ print $2 }' ORS=' ' | sed 's/\"/''/g')
ssids=($wpassid)
#or check a restricted list of SSID,s that are setup. 
#Put a # infront of the two lines above first; #ssids=$(awk..... & ssids=($wpassid)
#Enter one or more ssids that are already setup in the wifi settings
#Remove # below to use. separate SSIDs by a space, ('mySSID1' 'mySSID2')
#ssids=('myssid1')
#Main script
createAdHocNetwork()
{
    ip link set dev wlan0 down
    ip a add 10.0.0.5/24 dev wlan0
    ip link set dev wlan0 up
    systemctl start dnsmasq
    systemctl start hostapd
}
connected=false
for ssid in "${ssids[@]}"
doThis script will check what routers are available when the RPi. The first router found in the wifi settings will be connected to using existing configured WiFi settings. If no know routers are in range then a WiFi hotspot is created.
    if iw dev wlan0 scan ap-force | grep "$ssid" > /dev/null
    then
        wpa_supplicant -B -i wlan0 -c /etc/wpa_supplicant/wpa_supplicant.conf > /dev/null 2>&1
        if dhclient -1 wlan0
        then
            connected=true
            break
        else
            wpa_cli terminate
            break
        fi
    else
        echo "Not in range, WiFi with SSID:" $ssid
    fi
done
    if ! $connected; then
    createAdHocNetwork
fi
----- end     /usr/bin/autohotspot