# Add uxrce_client topics into voxl-px4

Source: https://forum.modalai.com/topic/3330/add-uxrce_client-topics-into-voxl-px4
Category: VOXL SDK and Software (https://forum.modalai.com/category/47/voxl-sdk-and-software)
Tags: ros
Posted: 2024-04-15 12:19:09 UTC by K.Stute
Replies: 1 · Views: 807

## K.Stute · 2024-04-15 12:19:09 UTC

Hi,
I'd like to know how i can add new topics to the uxrce_client. According to the px4 documentation i only have to add the topic in [this](https://github.com/PX4/PX4-Autopilot/blob/main/src/modules/uxrce_dds_client/dds_topics.yaml) yaml file and then build the client (included in px4) with it.
My problem is that in the forked version of px4 by [modalai](https://github.com/modalai/px4-firmware/tree/030a59eccfefe3a5e0d2c1649b44b7193cb4bc77) i am unable to locate the file since the above mentioned directory does not exist.
Any hints as to where the yaml file is located in the modalai fork are highly appreciated!

## Reply by Zachary Lowell 0 · 2024-04-15 16:31:19 UTC

@K-Stute here is the directory in voxl-dev px4-firmware: https://github.com/modalai/px4-firmware/blob/voxl-dev/src/modules/microdds_client/dds_topics.yaml