# Issue with LoRaWAN Message Transmission via MQTT

**URL:** <https://www.thethingsnetwork.org/forum/t/issue-with-lorawan-message-transmission-via-mqtt/68206>\
**Category:** MQTT\
**Tags:** gateways, end-devices, mqtt\
**Created:** [June 10, 2024, 9:31am UTC](https://www.thethingsnetwork.org/forum/t/issue-with-lorawan-message-transmission-via-mqtt/68206 "2024-06-10T09:31:24Z")\
**Posts on this page:** 1\
**Showing post:** 5

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**Author:** ![descartes](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/descartes/32/47220_2.png) [@descartes](https://www.thethingsnetwork.org/forum/u/descartes)\
**Post date:** [June 10, 2024, 4:12pm UTC](https://www.thethingsnetwork.org/forum/t/issue-with-lorawan-message-transmission-via-mqtt/68206/5 "2024-06-10T16:12:24Z")

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I’m confused - is this a repeat or just a different version of the same question?

And this:

> [@marianamador](#):
>
> MQTT is used to publish the data from the gateway to TTN for further processing.

can’t be correct as the Lorank8 uses the Poly Packet Forwarder which uses UDP not MQTT - although it’s “open source” the code isn’t actually shared so it’s hard to be definitive.

And if you subscribe to the ‘up’ topic, you get uplinks sent from the device, that’s one way only, what are you hoping to do by sending a message to that topic?

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