Room air conditioners on the ARTIK051 board (ARTIK051_KRAC_18K, issue #136)
report no oneUiVersion and carry a '_KRAC_' token in modelNum. The existing
'_RAC_' check can't see it -- the 'K' sits between the underscore and 'RAC' --
and the consumer-prefix fallback only covers washers/dryers/dishwashers, so
these units fell back to 'unknown': 8 of their 19 resources ended up unbound
and the device exposed nothing but a power switch.
Same ARTIK051 board family as the '_TVTL_' air purifier handled just below.