udp broadcast service rtp audio device
https://www.codeproject.com/Articles/394890/Play-or-Capture-Audio-Sound-Send-and-Receive-as-Mu
Real Time Streaming Protocol，RTSP
https://en.wikipedia.org/wiki/Real-time_Transport_Protocol
An Efficient Transmission Scheme of MPEG2-TS over RTP for a Hybrid DMB System
https://stackoverflow.com/questions/66154507/android-devices-stop-receiving-wifi-udp-broadcasts
https://en.wikipedia.org/wiki/Audio_over_IP
FMUSER FBE200 H.264 / H.265 HDMI to IP Video Converter, HDMI Encoder for Live Streaming Broadcast to Internet, IPTV Encoder WiFi/LAN Output HLS M3U8 VLC RTMP RTSP UDP HTTP for Facebook Live, YouTube
IP Active Speaker IP Network Audio System Poe Speaker
broadcasting VOIP telephone standard SIP RFC3261
SIP 2.0 TCP/IP UDP DHCP primary DNS and secondary DNS server
VLAN SNTP client
VPN L2TP / PPTP
SRTP webpage HTTP/HTTPS
Qos: 802.1p/q DSCP MD5 authentication
