• Which the release of FS2020 we see an explosition of activity on the forun and of course we are very happy to see this. But having all questions about FS2020 in one forum becomes a bit messy. So therefore we would like to ask you all to use the following guidelines when posting your questions:

    • Tag FS2020 specific questions with the MSFS2020 tag.
    • Questions about making 3D assets can be posted in the 3D asset design forum. Either post them in the subforum of the modelling tool you use or in the general forum if they are general.
    • Questions about aircraft design can be posted in the Aircraft design forum
    • Questions about airport design can be posted in the FS2020 airport design forum. Once airport development tools have been updated for FS2020 you can post tool speciifc questions in the subforums of those tools as well of course.
    • Questions about terrain design can be posted in the FS2020 terrain design forum.
    • Questions about SimConnect can be posted in the SimConnect forum.

    Any other question that is not specific to an aspect of development or tool can be posted in the General chat forum.

    By following these guidelines we make sure that the forums remain easy to read for everybody and also that the right people can find your post to answer it.


  1. J

    SDK SimConnect Variables - Source of Truth

    Does anyone know of any resource which is considered the best “Source of truth” for SimVars? I’ve found multiple locations so far which contain SimVar info such as: SimConnect Variable Index SimConnect Variable Category pages Programming API page listing Environment Variable SimVars Release...
  2. ZenMusic

    delete this

    delete this please
  3. C

    P3D v5 [SOLVED] SimConnect returning false while on ground

    I'm getting the boolean value of SIM ON GROUND and when the aircraft is on the ground, for fixed wing aircraft the sim return true as expected however when I switch to a rotor wing (helicopter) it returns false even if if the aircraft is standing on the ground with 0 velocity in any direction...
  4. E

    Using simconnect with third party airplane

    I'm trying to do a project with PMDG 737 is FS2020. How does one get a list of all the LVARS and KVARS supported by the airplane. Read somewhere you have to go thru the airplane xml files - but wasn't clear. Also, can I read set them using simconnect? The Simconnect api docs for...
  5. R

    COM RADIO RX Status

    Does anyone know if there is some way to know if specific radio (COM1,COM2,COM3 is receiving any message? It's possible to determine TX with (PILOT TRANSMITTING) but I have not found anything about RX. Only RX status found is for radio is enabled on not.
  6. Clamb

    MSFS SimConnect_AddToFacilityDefinition in C#

    Hi, I'm desperately trying to get airport information from MSFS using the relatively new SimConnect_AddToFacilityDefinition function. Sending the request and receiving some kind of data is working fine. However, I'm not able to get more than a single int. I've made a bare-minimum example for...
  7. L

    MSFS Connection between Microsoft Flight Simulator and external simulation engine.

    I am porting the Tu-154B-2 from X-Plane, for which I write an engine that can simulate "directly rewritten to C" LUA scripts, and executed it as a QT application. And at the moment I have: -Completely rewritten Datarefs; -The "core" of the engine itself, which executes the logic of the systems...
  8. =Hollywood=

    MSFS Building my first C sharp Simconnect Module (The Journey) using ChatGPT

    Okay for years I have developing my own code to bring in fire location data and someone years ago wrote a nice module for it for me, it was a freeware project, but it pulled up an interface module which I was really hoping to have it work as a part of the simconnect system without the interface...
  9. A

    How can I spawn in an object in relation to my aircraft?

    Hi there, I’m a scenery developer and I’m very new to development in this field. I’m trying to spawn in a stationary object a few meters away from my aircraft (e.g a bus), which is toggled by some externel app, or in-sim. I’d really appreciate if someone could help me get started. Thank you.
  10. J

    MSFS Unable to read ClientData at PANEL_SERVICE_PRE_KILL stage

    Hi! I want to notify a third party the plane is unloading. I'm doing so setting the data via SetClientData at the stage PANEL_SERVICE_PRE_KILL stage prior to the SimConnect handle is closed. However, the third party does not "see" the new data (SetClientData returns S_OK) whereas it works...
  11. J

    MSFS Unable to read ClientData at PANEL_SERVICE_PRE_KILL stage

    Hi! I want to notify a third party the plane is unloading. I'm doing so setting the data via SetClientData at the stage PANEL_SERVICE_PRE_KILL stage prior to the SimConnect handle is closed. However, the third party does not "see" the new data (SetClientData returns S_OK) whereas it works...
  12. RED COOL

    [SOLVED]Getting Nose wheel position

    Hello guys back in P3D days I've worked on an Addons that used nose wheel position in order to calculate some distances, my method to get this position was to request attachpoint world position of a taxi light effect used by the aircraft developer this method used to work very well. Now, I'm...
  13. Simon_2002

    MSFS MSFS 2020 C# SimConnect decreas of the showen Character

    Hello, I put together a small test plugin for MSFS 2020 in C#. Now it shows me a number with far too many decimal places for the defined variable of the height of the aircraft. How can I eliminate these decimal places? I would also like to create an if function that, at a flight altitude of...
  14. F

    MSFS Difference between LVAR, HVAR and SimVar

    Hi there! Pretty straightforward question, but can someone please explain the difference between all these types of variables, specially between LVAR and SimVar? I'm familiarized on using SimConnect with SimVars that are documented on the SDK, but I also see a lot of people mentioning LVARs...
  15. X

    dwDefineCount always increasing in simconnect

    Dear all, I've been having a problem with the sim frame rate slowly decreasing over the course of 45 mins or so and have been trying to figure it out. Visual Studio says the CPU is executing external code and using trial and error (and disabling bits until it works properly) I've found that...
  16. F

    MSFS Issues retrieving CDU text from PMDG 737-NG3 using SimConnect

    Hey everyone! A couple of years ago I've assembled an Arduino with a TFT display that shows the CDU text from PMDG's 737-NGX for P3D. I recently bought the NG3 for MSFS and was porting my code to the MSFS SimConnect, but I'm having some issues retrieving the CDU display data. I can send the...
  17. RED COOL

    MSFS WASM module | Render texture on simobject

    Hello I read that WASM modules allow aircraft developers to render some gauges using the low API functions provided by the wasm integration with MSFS, this module should be loaded through a reference in the Panel.cfg file as the documentation says. My question is: can we use those WASM Render...
  18. RED COOL

    MSFS Add-ons' interfaces withing MSFS

    Hello The way we used to be able to give the end user a control over simconnect add-ons during FSX/p3d era used to be through menus. We had drop down menus as well as multi-pages "ATC" menus that can be used to control or to monitor the process of certain add-ons using simconnect. I haven't seen...
  19. T

    MSFS How to send this LVAR?

    Hi, i would like to send this LVAR (>L:SWS_LIGHTING_Switch_Light_Landing, Enum) to Simconnect which should turn off the Landing Lights of the Simworks Studios Kodiak Quest 100, however even after extensive search i just did not make any progress so far. When i google for "WASM" or "sending...
  20. Paddy211185

    MSFS How to set COM_STBY_RADIO_SET (TCalc_004)

    Hello I have downloaded the simconnect TCalc_004 example and am trying in vain to change the standby frequency. Can anyone help me? Thats my code: my_simconnect.MapClientEventToSimEvent((Enum)Form1.EVENTS.KEY_COM1SBset, "COM_STBY_RADIO_SET")...