Work on MacroDeck:
Macro Deck -> Unity/SendMenuAction -> Unity UDP Server -> ExecuteMenuItem
Install on unity:
Install MacroDeckUnityUDPServer.unitypackage, it contains scripts(UDP server); This extension by default uses port:8193 (MacroDeck uses 8191). To change it either open Unity menu Tools/MacroDeck/UDPExecuteEditor or just modify the code in UDPExecuteEditor.cs