# Mobile access using tablet

Trikarus uses a [Tablet Lifetab P9812 by Medion](https://old.stadtfabrikanten.org/pages/createpage.action?spaceKey=TH&title=Tablet+Lifetab+P9812+by+Medion&linkCreation=true&fromPageId=72122559) to show the Repetier Server frontend and Grafana. For security reason the tablet is fully encrypted and secured py PIN.

Android version is 5 (Lollipop) → Installed Update is P891x\_Update\_4.zip

[![grafik.png](https://wiki.stadtfabrikanten.org/uploads/images/gallery/2026-06/scaled-1680-/iJQ60RYoousbRgWl-grafik.png)](https://wiki.stadtfabrikanten.org/uploads/images/gallery/2026-06/iJQ60RYoousbRgWl-grafik.png)

## Network configuration

- The wifi on the device is configured to be connected to **local Wifi SSID from the router only.** If you connect to freifunk.chemnitz.net ensure that the network is not stored or auto connection to this network is disabled. Otherwise connection might fail.
- the tablet is intended **only for local use** (no network forwarded communication over Freifunk or Wireguard)
- IP configuration is static (because in DHCP mode it does not obtain an IP). For every device we connect to the SSID we have to configure static settings manually:  
    
    - IP: 169.254.XXX.XXX
    - Gateway: 169.254.XXX.1
    - DNS: 169.254.XXX.1
    - Prefix length: 24
- using the static IP the device does not know about the host names of Raspberry Pi or Duet, but it can connect to IP addresses.
- using USB debugging the /etc/hosts file on the tablet could be adjusted manually
- <p class="callout warning">if the Wifi does not work</p>
    
    
    - go to the center of the printer. The Wifi range is so poor that it does not work for more than 2 meters distance sometimes
    - correctly anymore reboot the tablet!

## F-Droid Classic Installer

[https://archive.org/details/eu.bubu1.fdroidclassic\_1106](https://archive.org/details/eu.bubu1.fdroidclassic_1106)

## Firefox Browser for Android

[https://m.apkpure.com/de/firefox-browser-fast-private-safe-web-browser/org.mozilla.firefox/download/2015839749-APK-8876d332c909e8ef19273eb099dab157?from=variants%2Fversion](https://m.apkpure.com/de/firefox-browser-fast-private-safe-web-browser/org.mozilla.firefox/download/2015839749-APK-8876d332c909e8ef19273eb099dab157?from=variants%2Fversion)

## DIY Unlocker

→ Stadtfabrikanten e.V. Bild anzeigen als Werbung

## MacroDroid

Automatically turn light on in the morning (and keep it) and turn off again when museum is closing.