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-# AnotterKiosk
+AnotterKiosk
+=============================
 
+### Overview
 Another kiosk browser OS? Yes, this one is a little bit opinionated :)  
 
 The author ran several similar setups in production for years and has seen a lot of problems and strange failure modes.  
 This project aims to solve a lot of those (at least for the author), it might also be useful for others :)  
 
-Key features:
-- Images built via CI
+#### Key features
+- [Images built via CI](https://github.com/Manawyrm/AnotterKiosk/blob/main/.github/workflows/main.yml)
 - WiFi connection support
 - Raspberry Pi (Arm64) compatibility
-- USB flash drive, USB SSD, etc. compatible
+- [USB flash drive, USB SSD, etc. compatible](#how-to-use)
 - aarch64 mode for Raspberry Pis (_significant_ performance improvements over armv7/32bit ARM)
 - Read-only filesystem handling (no more broken SD cards)
 - Configurable cache clear functionality
-- HTTP watchdog (website needs to send heartbeat messages via XHR/AJAX to localhost)
+- [HTTP watchdog (website needs to send heartbeat messages via XHR/AJAX to localhost)](#http-watchdog-functionality)
 - Force specific resolution (1080p on 4k screens, broken EDID, etc.)
 - Hard NTP handling (will wait for NTP at boot)
 - SSH support
 - VNC support
 - SSH tunneling support (for remote-access without port-forwarding, etc.)
 
-Planned features:
+#### Planned features:
 - PC (x86) compatibility
 - Raspberry Pi PXE/network boot support
 - Network connectivity watchdog (configurable ping, etc. timeout)
 - Automatic reboot at specified time
 
-Security considerations:
+#### Security considerations:
 - Autossh does not check SSH host keys. This is okay-ish as long as the target server only allows tunneling, nothing else.
 - nginx/PHP are allowed to use sudo/NOPASSWD (because it needs to query the VideoCore, manage service, etc.), more priviledge seperation would be nice
 - due to the skeleton mechanism, the system has some ... creative permissions. some cleanup required.
 
-Inspirations / Other Kiosk-OSes:
+### How-To Use
+Like any other Raspberry Pi image: download the current .img file from the [Releases](https://github.com/Manawyrm/AnotterKiosk/releases) page and flash it to a storage device of your choice.  
+SD cards, USB flash drives, USB SSDs, SATA SSDs, NVMe SSDs are all good options.  
+You can use a tool like the [Raspberry Pi Imager](https://www.raspberrypi.com/software/), [BalenaEtcher](https://etcher.balena.io/), [Win32DiskImager](https://sourceforge.net/projects/win32diskimager/) or plain "dd" on \*nix-like systems.   
+When using the latter two, make sure to extract the .gz compression first (using a tool like 7zip).  
+
+After flashing, re-plug the storage device and open the FAT32 partition.  
+Open the [`kioskbrowser.ini`](https://github.com/Manawyrm/AnotterKiosk/blob/main/raspberry_pi_skeleton/boot/kioskbrowser.ini) file in a text editor and change everything to your needs.  
+More complex WiFi setups (like WPA2-Enterprise) can be configured by creating a wpa_supplicant.conf.  
+Adding your own SSH keys can be done by creating a authorized_keys file.  
+If you want to use the autossh tunneling features, copy an SSH private key as either "id_rsa" or "id_ed25519".
+
+### HTTP watchdog functionality
+Browsers are complex, networks are unstable and software can be buggy.   
+In order to get the highest reliability possible, self-hosted websites can be modified to include a heartbeat/watchdog functionality.
+This works by requesting a certain http-endpoint from the website at some interval.   
+If your page is being reloaded often (like with a <meta refresh=-header), you can just load the heartbeat-URL as an image:
+```html
+<img src="http://localhost/heartbeat.php" style="display: none;">
+```
+
+If your page stays on one page for a long time (or is just a single-page application), you might want to use AJAX requests to send a heartbeat:
+```html
+<script>
+const req = new XMLHttpRequest();
+setInterval(function() {
+	req.open("GET", "http://localhost/heartbeat.php");
+	req.send();
+}, 2000);
+</script>
+```
+
+Whenever the heartbeat stops (for whatever reason), the device will first restart the X11 environment (browser, window manager, etc.) and later (if it hasn't recovered) the whole system by rebooting.
+
+### Inspiration / Other Kiosk-OSes:
 - https://github.com/jareware/chilipie-kiosk/
 - https://github.com/guysoft/FullPageOS
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