Syncronize semaphore counters to queue dimension

- Remove RTOS timers
- Create LED task
- Avoid polling, instead wait for semaphore

Core/Src/canlog.c

@@ -121,8 +121,21 @@ void vLEDHeartbeat(void *argument)
 
     for (;;)
     {
-      if (osSemaphoreAcquire(context->semaphore, 25U) == osOK) HAL_GPIO_WritePin(context->led->port, context->led->pin, GPIO_PIN_SET);
+        // BLOCK for UP TO 25ms.
-      else HAL_GPIO_WritePin(context->led->port, context->led->pin, GPIO_PIN_RESET);
+        // - Returns osOK instantly if CAN traffic arrives.
+        // - Returns osTimeout if 25ms pass with NO traffic.
+        if (osSemaphoreAcquire(context->semaphore, 25U) == osOK)
+        {
+            // Traffic detected! Turn ON LED.
+            // Loop immediately to wait for the next message.
+            HAL_GPIO_WritePin(context->led->port, context->led->pin, GPIO_PIN_SET);
+        }
+        else
+        {
+            // Timeout! No CAN traffic for 25ms. Turn OFF LED.
+            // Loop and block again.
+            HAL_GPIO_WritePin(context->led->port, context->led->pin, GPIO_PIN_RESET);
+        }
     }
     /* CODE END */
 }