OBS to stream directly to VLC, using own custom server(Monaserver), Windows

https://sourceforge.net/projects/monaserver/
Download & extract zip to a folder, double click to run: MonaServer.exe


get you pc ip address says it's 192.168.0.11
In OBS -- Settings -- Stream -- Service:Custom -- Server:rtmp://192.168.0.11:1935  -- OK
click Start Streaming

In VLC menu -- Media -- Stream -- Network: rtmp://192.168.0.11:1935
click the drop down arrow of [Stream] button, click [Play]

or use cmd:
"C:\Program Files (x86)\VideoLAN\VLC\vlc.exe"  rtmp://192.168.0.11:1935  --fullscreen

If you have external monitor and wanna play full screen on it, manually change in VLC Simple Preferences -- Video -- Fullscreen Video Device=\\.\DISPLAY2  -- Save