Auto Access Point

This script is intended for the Raspeberry Pi. It will automatically create a hotspot, if there is no known wifi nearby. Therefore it will use systemd-networkd, wpa_supplicant and wpa_cli. If no device is connected to the hotspot for a while it will search for neworks again.

You need to have a /etc/wpa_supplicant/wpa_supplicant-device*.conf file similiar to this.

*Replace device with the name of your wifi interface, which is very likely to be wlan0.

country=FR                                                                        
ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev                           
update_config=1                                                                   
ap_scan=1

### auto hotspot ###      # has to be the first network section!                                                                                  
network={
    priority=0            # Lowest priority, so wpa_supplicant prefers the other networks below 
    ssid="autohotspot"    # your access point's name                                                            
    mode=2                                                                       
    key_mgmt=WPA-PSK                                                             
    psk="passphrase"      # your access point's password                                    
    frequency=2462                                                               
}

### your network(s) ###    
network={                                                                                                                               
    ssid="yourWifi"
    psk="passphrase"                                                 
} 

After having installed the script (see below) you can start a hotspot manually by running auto-hotspot --start-ap and stop it with --stop-ap.

If there is a wired network connection the Pi will work as a repeater

How it works is also discussed here: https://raspberrypi.stackexchange.com/questions/100195

Install

git clone https://github.com/0unknwn/auto-hotspot.git
cd auto-hotspot
chmod +x auto-hotspot install.sh
sudo ./install.sh