Given that the 'is_tx = 0' can not be moved in the whole handler thanks to a feasible race in between the delay in switching to STATE_RX_AACK_ON and also a new interrupt, we introduce an intermediate 'was_tx' boolean only for this reason. There is no Fixes tag making use of https://schemapro84836.full-design.com/lifetime-hosting-service-can-be-fun-for-anyone-71331826