HDMI expander
• https://blog.danman.eu/new‑version‑of‑lenkeng‑hdmi‑over‑ip‑extender‑lkv373a/ 
• go implementation https://github.com/benjojo/de‑ip‑hdmi 
• Sending audio to LKV373 HDMI extenders https://eta.st/2021/06/20/showtime.html