# Issue with Jmavsim

**URL:** <https://discuss.px4.io/t/issue-with-jmavsim/38004>\
**Category:** PX4 Autopilot\
**Created:** [April 30, 2024, 10:43am UTC](https://discuss.px4.io/t/issue-with-jmavsim/38004 "2024-04-30T10:43:22Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Adityashah1998](https://discuss.px4.io/letter_avatar_proxy/v4/letter/a/ed8c4c/32.png) [@Adityashah1998](https://discuss.px4.io/u/Adityashah1998)\
**Post date:** [April 30, 2024, 10:43am UTC](https://discuss.px4.io/t/issue-with-jmavsim/38004/1 "2024-04-30T10:43:23Z")

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I am trying to launch the SIH can be run as SITL (Software-In-The-Loop), using  
make px4\_sitl sihsim\_quadx.

I want to know how to decouple these two.

i.e., build using ’ none\_iris’ arguments and then use the separate command to launch the SIH mode/SITL mode.

Another question, how to connect the Jmavsim to the PX4 host target, I see it is unable to connect tcp