SIMCONNECT_RECV_ID_SIMCONNECT_RECV_ID_CUSTOM_ACTION

msfs::sys

Constant SIMCONNECT_RECV_ID_SIMCONNECT_RECV_ID_CUSTOM_ACTION 

Source 
pub const SIMCONNECT_RECV_ID_SIMCONNECT_RECV_ID_CUSTOM_ACTION: SIMCONNECT_RECV_ID = 14;