PUCAN_MSG_EXT_DATA_LEN
if (rx_msg_flags & PUCAN_MSG_EXT_DATA_LEN)
if (rx_msg_flags & PUCAN_MSG_EXT_DATA_LEN) {
msg_flags |= PUCAN_MSG_EXT_DATA_LEN;
if (rx_msg_flags & PUCAN_MSG_EXT_DATA_LEN) {
tx_msg_flags |= PUCAN_MSG_EXT_DATA_LEN;