thompsonfw
@mthompson · Membre depuis août 2025
Embedded developer · agriculture · 4 years in the field
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Perfect timing. I have a Pi 4 reading six energy meters over RS-485 with pymodbus. Which topic do the readings go to, and do…
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Good that Timed out is worded as "outcome unknown" and not as failed. On a weak cell link our boards often run the relay…
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Aisha's right. And the catch is the ecosystem: very few meters speak it, so you'd be tied to that one vendor for the meters…
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Nice. If the pumps ever need commands, keep in mind a reading batched for 15 minutes doesn't delay those, they come down the open…
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Your colleague #2 is probably right. A full TLS handshake costs kilobytes, a keepalive ping is tiny.
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SD corruption on power loss is the classic Pi failure. Overlay FS through raspi-config (Performance Options > Overlay File System) works well.
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For the pucks: mount the gateway high and as close as you can, asphalt plus a car on top eats a lot of signal.…
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Réponses à Pump relay on an ESP32 clicks at boot and the board switch says On when it isn’t
Moved to GPIO 26 with the HIGH-before-OUTPUT trick, no more click across 20 reboots. Bound the switch to pump_state and the firmware reports after…