# Data written to /dev/ttyHSL1 can later only be read if it is between bracktets i.e. \[\*data\*\]. All data outside of the brackets is ignored as if it does not exist

**URL:** <https://forum.legato.io/t/data-written-to-dev-ttyhsl1-can-later-only-be-read-if-it-is-between-bracktets-i-e-data-all-data-outside-of-the-brackets-is-ignored-as-if-it-does-not-exist/6634>\
**Category:** Legato Application Framework\
**Created:** [November 16, 2023, 4:08pm UTC](https://forum.legato.io/t/data-written-to-dev-ttyhsl1-can-later-only-be-read-if-it-is-between-bracktets-i-e-data-all-data-outside-of-the-brackets-is-ignored-as-if-it-does-not-exist/6634 "2023-11-16T16:08:57Z")\
**Posts on this page:** 1\
**Showing post:** 2

<div class="post-metadata">

**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.legato.io/jyijyi/32/822_2.png) [@jyijyi](https://forum.legato.io/u/jyijyi)\
**Post date:** [November 17, 2023, 12:00am UTC](https://forum.legato.io/t/data-written-to-dev-ttyhsl1-can-later-only-be-read-if-it-is-between-bracktets-i-e-data-all-data-outside-of-the-brackets-is-ignored-as-if-it-does-not-exist/6634/2 "2023-11-17T00:00:56Z")

</div>

You can try this application

> [@\[WP7605\]\[SW\] Testing 8-wire UART1 by ioctrl( )](https://forum.legato.io/t/wp7605-sw-testing-8-wire-uart1-by-ioctrl/5533/3):
>
> Yes I know, but Sierra requested whether R17 ioctrl() worked correctly as customer’s requirement. This is customer validation status. So we would like to know whether issue was caused by either source code or yocto FW. Sorry for inconvenient you, but please cooperate us to support it.

---

_[View the full topic](https://forum.legato.io/t/data-written-to-dev-ttyhsl1-can-later-only-be-read-if-it-is-between-bracktets-i-e-data-all-data-outside-of-the-brackets-is-ignored-as-if-it-does-not-exist/6634)._