Control cues and lighting via QLab's OSC API for a room's show control
domain: qlab.app · 6 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Enable OSC access in QLab's network preferences and note the workspace's listening details
Send OSC messages to QLab over UDP or TCP on port 53000 (QLab also accepts plain text commands on UDP port 53535, which it interprets as if they were OSC)
Address cues either by cue number or by their unique cue ID, since not all cues have numbers but all have a unique ID within the workspace
Send a general command such as /version to confirm connectivity and get QLab's version back, using alwaysReply if you want a reply for every message, not just ones that naturally generate one
Send cue-targeted commands like /cue/<number-or-id>/start, /stop, or /pause to drive room actions (e.g. starting an ambience track when a puzzle solves)
Use OSC queries to introspect the current workspace/cue list programmatically instead of hardcoding cue numbers in your room-control integration
Known gotchas
The exact OSC command dictionary differs across QLab 3, 4, and 5 — confirm which major version's dictionary your installed copy matches before relying on a specific command path
QLab only replies to messages that naturally produce a reply unless alwaysReply is set, so a 'silent success' is expected behavior, not a bug, for many control messages
OSC has no built-in authentication; QLab's OSC surface should be restricted to a trusted local network, same as other local show-control protocols in a room
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