# Use FCntUp as a pulse counter?

**URL:** <https://www.thethingsnetwork.org/forum/t/use-fcntup-as-a-pulse-counter/36090>\
**Category:** Application Development\
**Created:** [April 11, 2020, 9:29pm UTC](https://www.thethingsnetwork.org/forum/t/use-fcntup-as-a-pulse-counter/36090 "2020-04-11T21:29:17Z")\
**Posts on this page:** 1\
**Showing post:** 6

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**Author:** ![hobo](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/hobo/32/25844_2.png) [@hobo](https://www.thethingsnetwork.org/forum/u/hobo)\
**Post date:** [April 12, 2020, 11:03am UTC](https://www.thethingsnetwork.org/forum/t/use-fcntup-as-a-pulse-counter/36090/6 "2020-04-12T11:03:39Z")

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> [@arjanvanb](#):
>
> If the pulse frequency [is not too high](https://www.thethingsnetwork.org/forum/t/limitations-data-rate-packet-size-30-seconds-uplink-and-10-messages-downlink-per-day-fair-access-policy-guidelines/1300), then: yes, that will work.

One day there may be a need to send an answer to MAC command or other packed without application payload and at all not initiated by application.

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