The URL is built as wss://host:8884/mqtt (HiveMQ Cloud requires TLS). If connection fails on path,
try clearing /mqtt. Expected payload: {"temp":200,"rpm":3.8,"diameter":1.75}.
Defaults are baked into the file; any change here is saved in this browser only.
| # | Date / time | Temp °C | RPM | Dia mm |
|---|
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Keeps the most recent entries.