LITTLE KNOWN FACTS ABOUT ASTRA PREMIUM.

Given that the 'is_tx = 0' can't be moved in the entire handler as a consequence of a achievable race concerning the hold off in switching to STATE_RX_AACK_ON in addition to a new interrupt, we introduce an intermediate 'was_tx' boolean just for this goal. There is no Fixes tag applying here, many improvements are already designed on this space and