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Read/Set NAV with simconnect

Hi !
I'm interfacing my home cockpit with FS2020 and among the many issues I'm facing there is the following :
I can read and set Nav Standby frequency using events, but the active frequency always read as 0. I was able to set it by setting the standby frequency, then swapping active and standby.
Any information, experience sharing about this (setting the active NAV freq) would be welcome ...
You might want to give some examples of the code you have been trying? I can't speak for FS20 but for FSX it did involve a lot of dealing with BCD16 variable types which are not fun.
Thanks Anhony. I just realized that there's no need to set the active frequency. Setting the standby and swapping is the normal way of use, at least for the B737, corresponding to my home cockpit.