Continuously poll historical/buffered observations from an MTConnect agent using the sample request with sequence and interval parameters
domain: docs.mtconnect.org · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Issue an initial GET .../current (or .../sample) and record the returned nextSequence value from the response header/body
Issue GET .../sample?from={nextSequence}&count={n} to retrieve the next batch of observations starting at that sequence number
Set interval=0 for the agent to stream data as fast as possible, or a millisecond value to throttle delivery for long-poll style clients
Repeatedly advance `from` using each response's nextSequence value to page through the buffer without gaps or duplicates
Track the agent's instance ID (agentInstanceId) and restart the sequence from probe/current if it changes, since sequence numbers are not valid across agent restarts
Known gotchas
If a client falls behind and the requested sequence has rolled out of the circular buffer, the agent returns an out-of-range error and the client must resynchronize from current
An agent restart resets sequence numbering (new agentInstanceId), silently invalidating any previously cached `from` value
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