Write industrial sensor readings to InfluxDB 3 and query them back
domain: influxdata.com · 6 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Format each reading as line protocol: <measurement>[,<tag_key>=<tag_value>] <field_key>=<field_value> [<timestamp>], e.g. sensor,plant=line1,device=pump12 temperature=72.4,pressure=101.3 1708976567
Write via POST http://<host>:8181/api/v3/write_lp?db=<database>&precision=second with the line protocol lines as the request body and an Authorization: Bearer header carrying the database token
Query with SQL (the recommended language for InfluxDB 3): GET http://<host>:8181/api/v3/query_sql?db=<database>&q=select+*+from+sensor+limit+5
Or POST JSON to /api/v3/query_sql with a body like {"db":"<database>","q":"select * from sensor where time > now() - interval '1 hour'"}
Request format=jsonl, csv, or parquet via the query-string format param for large result sets
Legacy tooling can use the v1/v2-compatible write endpoints, but SQL is the optimized query path on InfluxDB 3, not Flux
Known gotchas
A field's type is fixed within a table — writing a string to a field that previously held a float returns a field type conflict error
Line protocol timestamp precision must match the precision query param (default nanosecond) or timestamps are silently misinterpreted
The InfluxDB Docker 'latest' tag points to InfluxDB 3, not v1/v2 — pin explicit version tags in industrial deployments
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