Decoded the solar protocol messages, previously logged as unhandled#73
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marklynch
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Jul 19, 2026
marklynch
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- Decoded the solar protocol messages, previously logged as unhandled: register 0x3A (slot 0x01) is the Solar Setpoint in °C (confirmed by changing the setpoint in the UI and watching the rebroadcast; polled by the Internet Gateway every cycle), CMD 0x2D is the Solar Setpoint Broadcast the touchscreen fires when the setpoint is changed (1-byte °C), and CMD 0x2C is the Solar Status Broadcast carrying the solar mode (Off/Auto/On), a config bitmask (Winter/Summer season, Flush daily, Filter pump required for solar), the temperature differential, and two bytes read as the pool-water/roof temperature readings (byte order unconfirmed) — all three handled log-only and documented in PROTOCOL.md, with the remaining 0x2C unknowns (a byte tracking differential − 3, an always-set bit) flagged for further captures
…: register 0x3A (slot 0x01) is the Solar Setpoint in °C (confirmed by changing the setpoint in the UI and watching the rebroadcast; polled by the Internet Gateway every cycle), CMD 0x2D is the Solar Setpoint Broadcast the touchscreen fires when the setpoint is changed (1-byte °C), and CMD 0x2C is the Solar Status Broadcast carrying the solar mode (Off/Auto/On), a config bitmask (Winter/Summer season, Flush daily, Filter pump required for solar), the temperature differential, and two bytes read as the pool-water/roof temperature readings (byte order unconfirmed) — all three handled log-only and documented in PROTOCOL.md, with the remaining 0x2C unknowns (a byte tracking differential − 3, an always-set bit) flagged for further captures
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