As the 'is_tx = 0' cannot be moved in the entire handler thanks to a probable race between the hold off in switching to STATE_RX_AACK_ON in addition to a new interrupt, we introduce an intermediate 'was_tx' boolean only for this reason. There isn't a Fixes tag making use of listed https://astra-pro62615.blogdun.com/29217403/lifetime-hosting-an-overview