Because the 'is_tx = 0' cannot be moved in the whole handler as a result of a attainable race amongst the delay in switching to STATE_RX_AACK_ON and also a new interrupt, we introduce an intermediate 'was_tx' boolean just for this intent. There is no Fixes tag applying in this article, https://manuelortuv.estate-blog.com/28198500/little-known-facts-about-schema-pro