# Difficulties with gazebo version used by PX4- SITL

**URL:** <https://discuss.px4.io/t/difficulties-with-gazebo-version-used-by-px4-sitl/34137>\
**Category:** PX4 Autopilot\
**Created:** [September 4, 2023, 7:26pm UTC](https://discuss.px4.io/t/difficulties-with-gazebo-version-used-by-px4-sitl/34137 "2023-09-04T19:26:45Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![luky](https://discuss.px4.io/letter_avatar_proxy/v4/letter/l/fbc32d/32.png) [@luky](https://discuss.px4.io/u/luky)\
**Post date:** [September 4, 2023, 7:26pm UTC](https://discuss.px4.io/t/difficulties-with-gazebo-version-used-by-px4-sitl/34137/1 "2023-09-04T19:26:45Z")

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hello,

I am new to this and I am stucked at this issue. I am using PX4 model called gz\_x500, which is gazebo garden model, but I am not sure, whether the simulation is really running in Gazebo garden, because I can not find any services or topics provided by the gazebo using MAVROS and ROS2 Humble. Does anyone have a clue, where the problem is? Isn’t there a problem, that my simulation is running in wrong Gazebo or even wrong version so my ros2 can not see it?  
PS: You can see my simulation in screenshot below.

thank you very much

 ![image](https://discuss.px4.io/uploads/default/original/2X/2/2bcea7417e855c8d0fe813f8f0352fb96162fe36.png)

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**Author:** ![Benja](https://discuss.px4.io/user_avatar/discuss.px4.io/benja/32/11872_2.png) [@Benja](https://discuss.px4.io/u/Benja)\
**Post date:** [October 6, 2023, 2:55pm UTC](https://discuss.px4.io/t/difficulties-with-gazebo-version-used-by-px4-sitl/34137/2 "2023-10-06T14:55:55Z")

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Hi @luky.  
You are using Garden indeed

note that PX4 directly interfaces with Gazebo using the `gz_bridge` module.  
Therefore you can’t see any topics or services on ROS2: ROS2 is just not used in the process.