Ran Media Renderer Analyser from Whitebear (thx AndrewFG) against the board
DMR Report (by Whitebear) for Up2Stream Pro V3
==============================================
Device Description Url=http://xxx.xxx.x.xxx:xxxxx/description.xml
HTTP Server Header=Linux/2.6.36+
Description=RAKOIT Wi-Fi Sound System
Friendly Name=Garage
Manufacturer Name=Rakoit Technology(SZ) Co., Ltd.
Manufacturer Url=http://xxx.xxx.x.xxx:xxxxx/https://www.rakoit.com
Model Name=Up2Stream Pro V3
Model Number=V01-Jun 22 2020
Model Url=http://xxx.xxx.x.xxx:xxxxx/https://www.rakoit.com
Serial Number=00001
UPnP Device Type=urn:schemas-upnp-org:device:MediaRenderer:1
UPnP Media Renderer version=1
Unique Device Name=uuid:FF31F09E-9D22-4448-4852-2821FF31F09E
X_DLNADOC Element=DMR-1.50
Service Url for AVTransport=http://xxx.xxx.x.xxx:xxxxx/upnp/rendertransportSCPD.xml
Service Url for ConnectionManager=http://xxx.xxx.x.xxx:xxxxx/upnp/renderconnmgrSCPD.xml
Service Url for RenderingControl=http://xxx.xxx.x.xxx:xxxxx/upnp/rendercontrolSCPD.xml
AVT:GetDeviceCapabilities action=Supported
AVT:GetMediaInfo action=Supported
AVT:GetPositionInfo action=Supported
AVT:GetTransportInfo action=Supported
AVT:GetTransportSettings action=Supported
AVT:SetNextAVTransportURI (gapless play)=NOT Supported
AVT:SyncPlay (synchronous play)=NOT Supported
RC:GetVolume action=Supported
RC:SetVolume action=Supported
AVT:Event Subscription=Succeeded
RC:Event Subscription=Succeeded
HTTP User Agent (client)=curl/7.36.0
Play test file result=Play success => Start Ok / Stop Ok
Media Center DLNA Server Advanced Settings
==========================================
DLNA=Checked
DLNAExtra=Checked
Enable bitrate Field=Checked
Filter international characters=Off
Include session ID=Off
Playstation 3 Compatible=Off
Present Caption Resources=Checked
Present Small Artwork=Off
Present Subtitle Resources=Checked
Skip Child Count=Off
Use flat URLs=Off
Use full URLs=Off
WMC Compatible=Off
Declared Supported Audio, Image & Video Formats
===============================================
http-get:*:audio/wav:DLNA.ORG_PN=LPCM
http-get:*:audio/x-wav:DLNA.ORG_PN=LPCM
http-get:*:audio/mpeg:DLNA.ORG_PN=MP3
http-get:*:audio/mpeg:DLNA.ORG_PN=MP3X
http-get:*:audio/x-ms-wma:DLNA.ORG_PN=WMABASE
http-get:*:audio/x-ms-wma:DLNA.ORG_PN=WMAFULL
http-get:*:audio/x-ms-wma:DLNA.ORG_PN=WMAPRO
http-get:*:audio/mpeg:DLNA.ORG_PN=MP2_MPS
http-get:*:audio/mp3:*
http-get:*:audio/wma:*
http-get:*:audio/mpeg:*
http-get:*:audio/vnd.dlna.adts:DLNA.ORG_PN=AAC_ADTS
http-get:*:audio/vnd.dlna.adts:DLNA.ORG_PN=AAC_ADTS_320
http-get:*:audio/m4a:DLNA.ORG_PN=AAC_ISO
http-get:*:audio/aac:DLNA.ORG_PN=AAC_ISO
http-get:*:audio/ac3:DLNA.ORG_PN=AC3
http-get:*:audio/ogg:*
http-get:*:audio/ape:*
http-get:*:audio/x-ape:*
http-get:*:audio/flac:*
the board has been working without issue since I connected it. Have queried Arylic regarding support for PCM L16 No Header and if they have plans to support SetNextAVTransportURI (for gapless). will post back when I get a reply
Hopefully get to the amplifier board this weekend and see how well they sync when linked up
Steve