What date range does a node have data for? Call this first for an unfamiliar node so you never query an empty range. Returns startDate/endDate in the node's local time zone, the timeZone name, and day/month/year counts.

Which data streams (source IDs) does a node have? Without a date window this lists every source that ever posted — including long-dead ones — so pass a UTC window to see only sources active in that period.

What is the most recent datum for each of a node's sources, and when was it recorded? Values are the device's own property map (e.g. watts, wattHours) passed through as-is — property names are the only unit hints; do not invent units. Sources silent for ~90 days are omitted unless you pass sinceDate to look further back.

Time series for a node between two node-local dates (end exclusive) — answers 'how much / what pattern over time'. Default Day aggregation gives one row per source per day; Hour suits intra-day shape (the API silently coarsens Hour to Day beyond 32 days); None returns raw samples and is refused over 7 days unless allowRaw=true. Responses are capped at 500 rows — when meta.truncated is true, page with offset.

How much energy (or any accumulating meter property, e.g. wattHours) was used or generated between two node-local dates? Computes a meter-style difference between readings nearest the period boundaries — the natural fit for 'total for June'. Each row shows the difference plus the _start/_end raw readings; only sources with accumulating properties appear.