Create Autohotspot shell for direct wifi

sbin/Autohotspot/ChangeLog-Autohotspot-Setup.txt

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+Change log for autohotspot-setup.sh  
+
+0.71 First release 19 Apr 2020

sbin/Autohotspot/ChangeLog-Autohotspot.txt

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+Change log for autohotspot and autohotspotN scripts
+
+version 0.95-61-N/HS-I & version 0.96-N/HS
+
+-Added error checking for status "Invalid exchange (-52)
+-If the wpa_supplicant.conf file was created in windows then it can contain Cr characters. These caused the ssid not to match so the hotspot was generated.
+SSID matching now filters the Cr.
+-Script output of local SSID's and BSS's in list to be read easier.
+-From Raspbian Buster hostapd is masked by default. If the Autohotspot setup has been done before the first system update, hostapd can get remasked. As this may happen in future updates the Autohotspot/N scripts check for Masked & enabled hostapd and dnsmasq services and disables/stops them before the script chooses network or hotspot.   

sbin/Autohotspot/ReadMe.txt

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+RaspberryConnect.com
+This installer script, the autohotspot and autohotspotN scripts can be shared and modified but all references to RaspberryConnect.com must be kept in place.
+
+AutoHotspot Setups:
+This script is for installing a Raspberry Pi WiFi setup where the Pi will connect to a previously configured Wifi network when the Pi is in range of the router or Automatically setup a Raspberry Pi Hotspot/access point when a known wifi network is not in range.
+This can also be run manually or with a timer to switch without a reboot.
+
+This is available in two setups:
+1: Internet access available for connected devices when a Ethernet cable is connected for the Raspberry Pi's 3A,3B,3B+ & 4. For Rapberry Pi's A,B, B+,& 2 if an usb Wifi adapter is used.
+2: No internet access for connected devices. Designed for the Raspberry Pi Zero W or other Raspberry PI's where only a direct connection to the PI from a phone, tablet or Laptop is required.
+
+There is also setup for permanent hotspot with internet access for connected devices.
+
+For more information and for the manual setup's see:
+https://www.raspberryconnect.com/projects/65-raspberrypi-hotspot-accesspoints/157-raspberry-pi-auto-wifi-hotspot-switch-internet
+https://www.raspberryconnect.com/projects/65-raspberrypi-hotspot-accesspoints/158-raspberry-pi-auto-wifi-hotspot-switch-direct-connection
+https://www.raspberryconnect.com/projects/65-raspberrypi-hotspot-accesspoints/168-raspberry-pi-hotspot-access-point-dhcpcd-method
+
+This script will install any of these three setups or allow you to change between setup types.
+In addition the Hotspot SSID and Password can be changed, new WiFi networks can be added to the Raspberry PI while in Hotspot Mode. The Pi can be forced between Network mode and Hotspot mode without a reboot. Also there is an uninstaller.
+
+To use the installer:
+
+Download the AutoHotspot-Setup.tar.xz archive from
+curl "https://www.raspberryconnect.com/images/hsinstaller/AutoHotspot-Setup.tar.gz" -o AutoHotspot-Setup.tar.gz
+
+Unarchive the file to the curent folder using the command
+tar -xzvf AutoHotspot-Setup.tar.xz
+If you are using the Desktop then right click on the AutoHotspot-Setup.tar.xz and select Extract Here
+
+open a terminal screen and navigate to the Autohotspot folder. If this is in your home directory then use 
+cd Autohotspot
+if this is your desktop then use 
+cd ./Desktop/Autohotspot
+Run the script with the command
+sudo ./autohotspot-setup.sh
+This script will fail if sudo is not used.
+
+You will presented with a menu with these options
+
+ 1 = Install Autohotspot with Internet for Connected Devices
+ 2 = Install Autohotspot with No Internet for connected devices
+ 3 = Install a Permanent Hotspot with Internet for connected devices
+ 4 = Uninstall Autohotspot or Permanent Hotspot
+ 5 = Add or Change a WiFi network (SSID)
+ 6 = Autohotspot: Force to a Hotspot or Force to Network if SSID in Range
+ 7 = Change the Hotspots SSID and Password
+ 8 = Exit
+
+Option 1: Install Autohotspot with Internet for Connected Devices 
+Once installed and after a reboot the Raspberry Pi will connect to a router that has previously been connected to and is listed in /etc/wpa_supplicant/wpa_supplicant.conf. If no router is in range then it will generate a WiFi hotspot.
+This will have an SSID of RPiHotspot and password of 1234567890
+Use option 7 to change the password and also the SSID if required
+If an ethernet cable is connected to the Pi with access to the internet then it will allow devices connected to the hotspot access to the internet or local network.
+Once a connection to the hotspot has been made you can access the Raspberry Pi via ssh & VNC with
+ssh [email protected]
+vnc: 192.168.50.5::5900
+for webservers use http://192.168.50.5/
+
+Option 2: Install Autohotspot with No Internet for connected devices
+This option is similar to option 1 but connected devices have no internet connection if an ethernet cable is connected. 
+This has been designed so you can access only the Pi from a Laptop, tablet or phone.
+The hotspot SSID will be RPiHotspot with a password of 1234567890
+Once a connection to the hotspot has been made you can access the Raspberry Pi via ssh & VNC with
+ssh [email protected]
+vnc: 10.0.0.5::5900
+for webservers use http://10.0.0.5/
+
+Otion 3: Install a Permanent Hotspot with Internet for connected devices
+This is for a permanent WiFi hotspot with internet access for connected devices.
+The Raspberry Pi will only have network or internet access when an ethernet cable is connected.
+Once a connection to the hotspot has been made you can access the Raspberry Pi via ssh & VNC with
+ssh [email protected]
+vnc: 192.168.50.10::5900
+for webservers use http://192.168.50.10/
+
+Additional setup is required if you wanted to use a second WiFi device to connect to the internet rather than a ethernet conection. This will be a future option.
+
+Option 4: Uninstall Autohotspot or Permanent Hotspot
+This will disable the setup of any of the three setups and return the Raspberry Pi to default Wifi settings.
+Hostapd & dnsmasq will not be uninstalled just disabled.
+
+Option 5: Add or Change a WiFi network (SSID)
+If you are using either of the autohotspot setups in hotspot modes and wish to connect to a local WiFi network. You will be unable to scan for any networks as the desktop wifi option will be disabled, shown as red crosses. You can manually add the details to /etc/wpa_supplicant/wpa_supplicant.conf if you know them. 
+This option will allow you to scan for local WiFi networks and update the Pi. If you then reboot or use the Force... option ,see below. 
+This option only works for WiFi networks where only a password is required. If a username is required this will not work. (Future update)
+
+Option 6: Autohotspot: Force to a Hotspot or Force to Network if SSID in Range
+This option is only for the Autohotspot setups.
+If you are at home and connected to your home network but would like to use the hotspot. This option will force the pi to hotspot mode and will ignore your home network untill the next reboot. If you use this option again while in hotspot mode it will attempt to connect to a known network. This will go back to the hotspot if no valid WiFi network is found or there is a connection issue.
+
+Option 7: Change the Hotspots SSID and Password
+By default the hotspot ssid is RPiHotSpot with a password of 1234567890. Use this option to change either or both SSID and Password.
+You will be prompted to change both but if you make no entry and press enter the existing setting will be kept.
+The password must be at least 8 characters. 
+
+Option 8: Exit
+Exit the script.
+
+
+NFtables Warning.
+This setup uses iptables for routing the Hotspots to the internet, options 1 & 3. From Raspbian 10 Buster, IPtables are depreciated in place of NFtables. By default NFtables will handle IPtable rules. 
+If you know you are using NFtables for a Firewall or other routing rules then don't use the internet routed hotspots and only use option 2, Autohotspot without internet. Otherwise there will be a conflict with your routing tables. 
+NFtables will be implemented shortly in the next main update of the installer and scripts.    
+Raspbian Stretch (9) & Jessie (8) only use IPtables.
+You will be warned when you initally run the installer script if NFtables are active.
+
+/etc/network/interfaces file:
+many older hotspot and network setup guides online add entries to the /etc/network/interfaces file. This file is depreciated in Raspbian and any entry in this file is not compatible with these setups. This installer backup and remove any entries found in this file. They will be restored if the uninstall option is used.
+
+RaspberryConnect.com