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There is a category of problem that Wi-Fi cannot solve: borehole pumps, farm irrigation valves, plot gates, and rental geysers with mains power but no data connection. CellLink32 is a 60 × 60 mm six-layer controller board taking an LTE Cat 1 link, ESP32-S3, and a 2-coil latching relay to deliver rock-solid, zero-standby-power switching.
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