Directly setting a settable simvar via WASM

User Support Hub SDK
1

What is the best way to set a simvar in a C++ wasm module? I know there is the key events but there is no key event to write on some of the simvars (Avars). I am trying to force a bus voltage (A:ELECTRICAL MAIN BUS VOLTAGE:1 for instance) using execute_calculator_code() function but not successful. According to the SDK, ELECTRICAL MAIN BUS VOLTAGE is a settable simvar but there is no key event to set it.
my function that I am using is:

execute_calculator_code(“28 (>A:ELECTRICAL MAIN BUS VOLTAGE:1, Volts)”, nullptr, nullptr, nullptr);

please let me know if there is a possibility to directly write into a settable simvar with an index.

2

Either the calculator code or simconnect… no other way.

Best,
R.

3

can you give me an example how should I use the calculator code for ELECTRICAL MAIN BUS VOLTAGE simvar?

4

Just like you would do it using RPN code, however the variable simvar must be writable, if it is not, you can only use events to manipulate the value

5

So technically this should work to set the voltage of a bus:1 to 28 volts:
execute_calculator_code(“28 (>A:ELECTRICAL MAIN BUS VOLTAGE:1, Volts)”, nullptr, nullptr, nullptr);

but it doesn’t :frowning:

6

Check that sim var is writable and also the electrical systems of that product you working with supports that voltage, it might be capped

7

Are you quite certain that overriding the voltage can actually work? I am pretty sure that in a running aircraft simulation the voltage is handled by the aircraft code itself. There are many instances where that is the case. While you can technically set the value of a variable (doesn’t matter how you do it) - it holds that value only briefly - then the associated aircraft system resets it to the value that it is supposed to have.

Try a loop, set the value constantly as fast as you can. Maybe use a crazy value, so you can definitely see if something is happening. Then at least you know that setting the variable is working and/or futile (unless you keep the loop running)