[L431][HAL][CAN] Cannot force no ACK error in CAN handling

[BPrac.1]

HI!

I'm trying to impelemnt watchdog on my CAN devices, but i cannot force CAN error for testing.

hcan1->ErrorCode is always 0 value, even if i disconnect CAN and no device are acknowledging message(no ack have its own error code in HAL).

I see on oscilloscope, theres no ACK. Why i cant get this error?

there's the way im sending frame. And frame is sending every time(see it on oscilloscope)

if (!HAL_CAN_IsTxMessagePending(&hcan1, canTxMailbox)
		&& HAL_CAN_GetTxMailboxesFreeLevel(&hcan1) > 0) {
	if (HAL_CAN_AddTxMessage(&hcan1, canTxHeader, canTxData,
			&canTxMailbox) != HAL_OK) {
		Error_Handler();
	} else {
 
		HAL_IWDG_Refresh(&hiwdg);
 
	}
}