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Release status: experimental [box doku]

Description Bus to connect different devices in the lab and in the outside world
Author(s)  tiefpunkt

The MuMaBus is a framework to connect different devices in the lab to each other and with outside services. This is currently done using MQTT.

Bus details

  • MQTT Broker:
    • Note: Old nodes in the bus still use Both brokers are bridged, so messages sent to one broker will be received by devices connected to the other as well. But new devices should always use
  • Port: 1883 (unencrypted), 8883 (SSL, using a CACert certificate)
  • Anonymous read access to mumalab/#
  • For write access, contact Matthias or Severin


Topic Description Possible values Devices
mumalab/DMX/1/controller MAC and IP of DMX controller, comma separated
mumalab/DMX/1/set interface to set DMX channels Accepts list of DMX id:state, comma separated. State is int between 0-255 (0 is off), or 1000 (toggle between on and off)
mumalab/DMX/1/state list of current state of DMX ids with state, comma separeted e.g.: "0:0,1:0,2:255,3:0,4:0,5:0,6:0,7:0,8:0,9:0,10:0,11:0"
mumalab/mccafe/1/buttonpress Button presses on the fastfood remotes e.g. "B2" Fastfood Remotes
mumalab/mpd/command Control the MPD via MQTT play, pause, next, previous, toggle, volume up, volume down SpaceMusic
mumalab/room/status Status of the lab 0 for closed, 1 for open, ? for unknown StartYourEngines
mumalab/room/door/status Status of the door of the main room 0 for closed, 1 for open, ? for unknown
mumalab/otherroom/door Status of the door of the other room 0 for closed, 1 for open, ? for unknown
mumalab/room/sensors/# Sensors across the space plain numeric values SensorNode
mumalab/mrcoffee/status Status of the coffee maker 0 for inactive, 1 for active MrCoffee
mumalab/fridge/# Lights and Sensors of the drinks fridge tbd Fridge
mumalab/room/lights/# Light control system tbd LightsOut
mumalab/room/lights/hanging_lights/state Hanging lights above the worktables 0, 1 LightsOut
mumalab/room/lights/whiteboard/state Light tube around the whiteboard 0, 1 LightsOut
mumalab/room/lights/chandelier/state Chandelier incl. RGB LED 0, 1 LightsOut
mumalab/room/lights/ceiling/command RGB ceiling lights off, red, green, blue, white
mumalab/room/display VFD Display in the space Text Cash Register Display
mumalab/room/ledpanel/# LED Panel from Jorgen LEDPanel
mumalab/audio/x32/ Behringer x32 mixing desk (Mischpult) Behringer x32
mumalab/room/rcsockets RF power socket control "a,11111,00101,0"
mumalab/room/balls/# The Ballrun on the wall of the space send whatever you want. It's the gesture that counts Ballrun

DMX Devices

Channel Device Details
1-12 DMX Switchpack Not used yet
18-19 Strobe 18 Speed

19 Intensity

20-38 Ceiling LEDs 20 Intensity

21 Red

22 Green

23 Blue

24 White

25 Preset

26 Not in Use

27 Speed

28 Control

30 Intensity

31 Red

32 Green

33 Blue

34 White

35 Preset

36 Not in Use

37 Speed

38 Control

48-53 Laser (no one likes it) 48: Pattern

49: Laser 1

50: Laser 2

51: Laser 3

RF power sockets

Switched via MQTT connected basestation. Send the following to mumalab/room/rcsockets:


with the options

Currently placed sockets

Identifier Description Switched on/off with the space status
a,11111,00001 Nebenraum door status no
a,11111,00010 BobbyCar and light tube above common room yes
a,11111,00011 Wall of Monitors (only screens, no orange pis). Also switches LED strip behind the screens yes
d,a,1 Alarm light no
d,a,2 Electronics corner yes

Devices & Projects using the MuMaBus