Command & Control

Name	Command & Control
Description	A wall of displays showing off the most essential data needed by NOC & C3L in general.
Status	Running
Contact	virii & orimpe
Participants:	metalgamer xbr

Hardware

4x ORDOID C2

4x 8GB eMMC

4x 16x2 LCD IO kits

4x GW2270 1080p HDMI monitors

4x 1M patch cables

1x 5 port network switch

4x 1M HDMI cables

4x power supplies

Software

Fullscreen web browser with no controls (Kiosk-style)

MCR-Alpha (Top-Left): Turris

MCR-Gamma (Bottom-Left): MQTT

MCR-Delta (Bottom-Right): ODroid

MCR-Beta (Top-Right): SpaceAPI

autom8 account

This user is used internally to shut down the individual SBCs (Single-board computer) when the space is closing.

It needs to have access to at least shutdown without entering a password:

The following line is in the sudoers file:

autom8 ALL=NOPASSWD: /sbin/halt, /sbin/reboot, /sbin/poweroff, /sbin/shutdown now

The autom8 user connects via SSH, so the following key is authorized:

ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDZOMpHb1kVe+4dhj5QTh6wB69RSbkqxA6CA9Olwq+SSIe/CObbOafaEGyTUmZ1HDIgyTGzH2PgYDz17gxcld11GBKrW4lViIvkblnbMyzjjzxqqJY4CwGjpEBtnwnw3q4GZqQO2Jk7ZK1aJ3s5nJylDMmaLong5BUqDwohBNykuC2OMt+Xg/o0px3uVvz//THjIy4SSRGKwDnoh8d8CIOvi3RA1g6wov8q/Xcm4w6eZhOTgInovO9sKukng3LgTnnY5FXHuCRBZuvi9sy6Bye8If3rG4uPMQ3fLnd/Y7ekDev7oZLViFm7Ldmgmbpu99ezdus+OOdo0YeHegccxAux autom8@dash

16x2 LCD text, currently dependent on the host:

MCR-Alpha:

Hello! ODROID!
- MCR-Alpha -

MCR-Gamma:

Hello! ODROID!
- MCR-Gamma -

MCR-Delta:

Hello! ODROID!
- MCR-Delta -

MCR-Beta:

Hello! ODROID!
- MCR-Beta -

Implementation

The ODROIDs are now using Armbian's Focal (Fossa) XFCE release with an older version (early 2020 release) of the U-Boot bootloader flashed with the ArchLinuxARM sd_fusing.sh tool.

This older bootloader version is flashed instead of using the one that is on the Armbian image, because at the time of installation, the version distributed on Armbian's ISO images is a more recent, broken version. (doesn't boot without a serial adapter connected, Ethernet doesn't work.

Then:

an odroid user and autom8 user are created

the autom8 user gets the ssh key added

the sudoers shutdown commands get added to the '/etc/sudoders' file

a file to autostart XFCE, with the odroid user is added (lightdm)

Add the Barrier SSL key to the Barrier's TrustedServers.txt

add files to the odroid user's autostart (XFCE) directory:

Start Firefox Kiosk mode with the corresponding URL

Kill the xfce4 panel/menu bar because otherwise it shows up over the firefox fullscreen until the window is clicked on

Start Barrier in client mode that automatically connects to the server (config) with SSL, or in server mode with SSL (config)