# PX4 Community Q&A: May 10, 2023 **URL:** \ **Category:** PX4 Autopilot\ **Created:** [May 3, 2023, 5:00pm UTC](https://discuss.px4.io/t/px4-community-q-a-may-10-2023/32060 "2023-05-03T17:00:50Z")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![rroche](https://discuss.px4.io/user_avatar/discuss.px4.io/rroche/32/17635_2.png) [@rroche](https://discuss.px4.io/u/rroche)\ **Post date:** [May 3, 2023, 5:00pm UTC](https://discuss.px4.io/t/px4-community-q-a-may-10-2023/32060/1 "2023-05-03T17:00:50Z")
# May 10, 2023 ## Join us > **[Discord - Group Chat That’s All Fun & Games](https://discord.com/channels/1022170275984457759/1022185721450213396/1065287189791002776)** > > Discord is great for playing games and chilling with friends, or even building a worldwide community. Customize your own space to talk, play, and hang out. ## Agenda - Community Announcement - Community Q&A - General Discussions ## 📢 Community Announcement * * * ### A.1 : ## 🧑‍🤝‍🧑 Community Q&A (No deep technical discussions) * * * ### ❗ Guideline for asking a Question 1. Specify what you are trying to **achieve** 2. Specify what environment / **platform** you are using 3. Prepare a **Link** or **Document** to help understand if possible 4. First, ask the question on **Discord** or [create a **Github Issue**](https://github.com/PX4/PX4-Autopilot/issues/new/choose)! 5. If you take over 5 minutes for the question, please continue in Discord or a Github Issue. ### Q.1: VIO bridge alternative > > > \## Question > 1. Is there any example of the VIO bridge ROS node that provides a …bridge between a camera and ROS? > 2. If yes for what version of firmware is it compatible with? > > \## Explanation > Previously I was working with the older version of firmware ( with ekf2\_aid\_mask param) and Autherion VIO bridge. In the simulation drone was flying properly in the scenario with VIO and turned off GPS. My goal was flying the drone with VIO and missing temporary GPS signal which I couldn't achieve. After attending PX4 community Devcall about month ago I was trying to implement flying the with VIO and missing GPS with firmware (1.14.0beta with ekf2\_ev\_ctrl parameter).In the sitl simulation drone wasn't flying properly with VIO system. I think that there could be a problem with VIO bridge. After this week PX4 call I was recommended to create this github issue with my VIO problem. > > I am using 1.14.0beta - firmware version. > > Here is my rosgraph and frames. > !\[rosgraph\](https://user-images.githubusercontent.com/60292200/233388621-89aa5cf0-e295-4d0b-a4c3-2363a6f390d3.png) > !\[frames\](https://user-images.githubusercontent.com/60292200/233388645-720c13f4-721c-4230-80e8-b7468c2575f5.png) > Thanks in advance for any help. Auterion repo is now private, is there an alternative? Answer: Post on discord & maybe people may know there! ### Q.2: QGC customizing a function - Anthony To export KML files? How to get started in modifying the QGC code? Object detection use case: Requiring confidence parameter, etc. Goal: Handle a specific file (e.g. KML) that is getting passed through. There’s a rectangular pattern. And want to have a function to generate KML file with certain parameters. Answer: There’s “Polygon tools” code section. Farhang will answer in DM. ### Q.3: How to suppress preflight check? - Farhang Currently the disarmed PWM value equals failsafe PWM value. Leading to unintended failsafe trigger. In Gazebo, it’s now hard to determine if vehicle is in failsafe mode via PWM output value. Starting from v1.12, the parachute package in SITL Gazebo isn’t working. > > > The instructions in https://docs.px4.io/master/en/simulation/gazebo.html#simulat…ed-parachute-flight-termination explain that you can simulate parachute deployment by first launching the simulator with: > \`\`\` > make px4\_sitl gazebo\_if750a > \`\`\` > Then force flight termination. > > I tested this by forcing an altitude safety geofence violation (set a low altitude ceiling and flew straight up). > The flight termination happens - there are GCS notifications and the vehicle crashes. But there is no indication that a parachute is deployed. > > How would you know? Shouldn't we see something appear on the screen? Action Item: Ping beat on discord about this ## 🤔 General Discussions * * * ### D.1 :