As the 'is_tx = 0' can't be moved in the whole handler thanks to a achievable race among 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 function. There is not any Fixes tag implementing listed here, https://laneosvvw.csublogs.com/34825940/how-wordpress-plugin-can-save-you-time-stress-and-money