Duet (RepRapFirmware) HTTP interface: send gcode and query status
domain: duet3d.com · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Establish a session first via GET /rr_connect (with password if configured) — almost every other endpoint requires a valid session and returns 401 otherwise.
Send G/M/T-codes with GET /rr_gcode?gcode=<code>, e.g. G28 to home axes.
Fetch the standard status response (temperatures, position, current job progress) via the rr_status-family endpoint documented in the RepRapFirmware HTTP requests reference.
Retrieve any pending G-code reply text via /rr_reply, since rr_gcode does not return command output directly.
For firmware 3.4.1+, consult the published OpenAPI definitions for SBC mode vs standalone mode, since endpoint availability differs between them.
Known gotchas
Nearly every endpoint besides rr_connect requires a prior successful session — skipping that step produces 401s that look like an unrelated auth/config bug.
Endpoint availability and exact JSON shape differ between standalone RepRapFirmware and SBC mode (Duet paired with a single-board computer running DSF) — confirm which mode applies.
G-code execution is asynchronous relative to the rr_gcode call; you must poll rr_reply/rr_status to know whether a command succeeded or produced output.
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