# V3 using MQTT to Downlink from NodeRED

**URL:** <https://www.thethingsnetwork.org/forum/t/v3-using-mqtt-to-downlink-from-nodered/52629>\
**Category:** Application Development\
**Created:** [October 23, 2021, 2:14pm UTC](https://www.thethingsnetwork.org/forum/t/v3-using-mqtt-to-downlink-from-nodered/52629 "2021-10-23T14:14:10Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![simmoinard](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/simmoinard/32/35697_2.png) [@simmoinard](https://www.thethingsnetwork.org/forum/u/simmoinard)\
**Post date:** [October 23, 2021, 2:14pm UTC](https://www.thethingsnetwork.org/forum/t/v3-using-mqtt-to-downlink-from-nodered/52629/1 "2021-10-23T14:14:11Z")

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Hi guys,  
this is something that has been already discussed in this forum but even with the posts that i found that talks about this, I cannot success to downlink a message using NodeRed with the “MQTT out” node.

I can read data from my sensors with the “MQTT in” node, the configuration of “MQTT out” are quite the same so I guess the problem does not come from the server.

The message that i send is based on [this page](https://www.thethingsnetwork.org/forum/t/mqtt-downlink-in-node-red/38096) or [this tuto](https://www.thethingsnetwork.org/forum/t/mqtt-in-node-red-howto/39909)

This is an exemple of the message sent to my MQTT out node :  
 ![image](https://www.thethingsnetwork.org/forum/uploads/default/original/3X/a/2/a2bba427fbb6c2d21ce2ff69a4d6b864d6e2172d.png)

my function node :  
 ![image](https://www.thethingsnetwork.org/forum/uploads/default/original/3X/1/9/191fd6821759ec6cb3438d0b2c88479434babad9.png)

I send it to v3/hubis@ttn/devices/eui-0004a30b00f50d7d/down

I don’t see anything on my terminal node. Note that my node receive data if I use the console  
 ![image](https://www.thethingsnetwork.org/forum/uploads/default/original/3X/c/7/c7929ff95b54a5fcca361ad8d2c0db17e0958a4b.png)

Can you guys see some problem ? I suspect a js problem (as this is not my favorite language)

Thank’s,

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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:** [October 23, 2021, 2:24pm UTC](https://www.thethingsnetwork.org/forum/t/v3-using-mqtt-to-downlink-from-nodered/52629/2 "2021-10-23T14:24:42Z")

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> [@simmoinard](#):
>
> Can you guys see some problem ?

Using v2 tutorials on a v3 system. The JSON has changed:

[https://www.thethingsindustries.com/docs/integrations/mqtt/](https://www.thethingsindustries.com/docs/integrations/mqtt/)

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<div class="post-metadata">

**Author:** ![simmoinard](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/simmoinard/32/35697_2.png) [@simmoinard](https://www.thethingsnetwork.org/forum/u/simmoinard)\
**Post date:** [October 23, 2021, 2:51pm UTC](https://www.thethingsnetwork.org/forum/t/v3-using-mqtt-to-downlink-from-nodered/52629/3 "2021-10-23T14:51:54Z")

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It works, thank you so much !

I add the /push at the end of the topic, and changed the Json.  
Have a nice day !