AC-1..AC-4 are the four upstream anomalies of the generic sunspec vendor
(setpoint range, read/write mismatch on the rate states, enableDischarging
never reconciled, revert timer never written).
AC-5..AC-15 are the Fronius-specific behaviour: manufacturer filter, byte
order, connection parameters, polling floor, forbidden writes, the HEMS
intent to register table, scale factor reread, readback verification and
the model 160 block classification.
Points the design contract leaves open are recorded as explicit working
hypotheses (H-1..H-6) rather than blocking on them.
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