# I can't subscribe to MQTT Payload Fields

**URL:** <https://www.thethingsnetwork.org/forum/t/i-cant-subscribe-to-mqtt-payload-fields/37520>\
**Category:** Application Development\
**Created:** [June 2, 2020, 10:22am UTC](https://www.thethingsnetwork.org/forum/t/i-cant-subscribe-to-mqtt-payload-fields/37520 "2020-06-02T10:22:36Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![arjanvanb](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/arjanvanb/32/46626_2.png) [@arjanvanb](https://www.thethingsnetwork.org/forum/u/arjanvanb)\
**Post date:** [June 2, 2020, 11:26am UTC](https://www.thethingsnetwork.org/forum/t/i-cant-subscribe-to-mqtt-payload-fields/37520/4 "2020-06-02T11:26:47Z")

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> [@MarinusCWD](#):
>
> ```plaintext
> topic ''+/devices/+/up''
> 
> ```

I see double single-quotes there, which makes me think you used single quotes in the command line? Please show the full command line. And again: did you see the “When using Windows” remarks in the documentation?

Please see also [How do I format my forum post? [HowTo]](https://www.thethingsnetwork.org/forum/t/how-do-i-format-my-forum-post-howto/8735) to avoid the forum from showing funny curly quotes.

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