Subscribe to live printer status updates via Moonraker's websocket JSON-RPC API
domain: moonraker.readthedocs.io · 4 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Open a persistent WebSocket (or Unix socket) connection to Moonraker, since subscriptions are not available over plain HTTP.
Send a JSON-RPC printer.objects.subscribe request specifying the objects and attributes to watch.
Read the initial state synchronously from the RPC response, then listen for asynchronous notify_status_update notifications as those objects change.
Send a new subscribe request with an empty objects map to cancel the subscription.
Known gotchas
A new subscription request completely replaces any prior subscription on that connection — it is not additive.
The webhooks object should not be relied on to catch startup/ready/error transitions, since Moonraker may connect to Klipper only after those states have already passed.
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