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The timer_hw_periodic example is the equivalent of timer_sw_periodic implmented with the on-chip timer. In this example, one task is created to process the interrupt and it waits for a notification to unblock and execute. The expiration of the hardware timer triggers an interrupt and the ISR sends a notification to the interrupt processing task. This is done to defer the interrupt processing to a task and minimize time in the hardware ISR that is not part of the RTOS kernel scheduling. After the notification is received, the task is unblocked and toggles the on-board LED before re-entering the BLOCKed state to wait for the next notification.