# Companion MCU parameters

**URL:** <https://discuss.px4.io/t/companion-mcu-parameters/43400>\
**Category:** PX4 Autopilot\
**Created:** [January 21, 2025, 1:48pm UTC](https://discuss.px4.io/t/companion-mcu-parameters/43400 "2025-01-21T13:48:46Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![dotanAtTrim](https://discuss.px4.io/user_avatar/discuss.px4.io/dotanattrim/32/14833_2.png) [@dotanAtTrim](https://discuss.px4.io/u/dotanAtTrim)\
**Post date:** [January 21, 2025, 1:48pm UTC](https://discuss.px4.io/t/companion-mcu-parameters/43400/1 "2025-01-21T13:48:46Z")

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I’m trying to implement some parameters for my companion computer, which is actually an STM32 mcu, without external flash memory.  
One way is to use its internal flash, which I am trying to avoid unless someone can really recommend doing so.

So, my effort at the moment is using PX4 to store parameters for me, using a simple module.  
I have a set of parameters for the module which can be easily updated from QGC.  
My problem now - I want to forward those relevant parameters to the companion computer.  
This has 2 parts in it - **identify** that a relevant parameter was updated, and **sending** a PARAM\_SET message (or forwarding it) to my companion computer.

I’m struggling with last 2 parts. I can’t find resources or examples on how to do so and I’ve been looking for a few days now.