if (ao_packet_tx_used && ao_tx_packet.len == 0) {
memcpy(&ao_tx_packet.d, tx_data, ao_packet_tx_used);
ao_tx_packet.len = ao_packet_tx_used;
if (ao_packet_tx_used && ao_tx_packet.len == 0) {
memcpy(&ao_tx_packet.d, tx_data, ao_packet_tx_used);
ao_tx_packet.len = ao_packet_tx_used;