Because the 'is_tx = 0' cannot be moved in the whole handler on account of a attainable race involving 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 goal. There's no Fixes tag applying in this article, https://claytonfhjkl.azzablog.com/28760846/an-unbiased-view-of-astra-premium-sites-plugin