Just ran some test, but the uPnP services are discovered in the same manner, but fail to expose themselves in V3.396 on the HP’s:
Both Dell and HP have the kernel headers install for mpd_oled, so basic they have the same install and configuration.
sudo apt-get install gupnp-tools
Dell:
volumio@volumiodell:~$ gssdp-discover -i eth0 --timeout=3 --target=urn:schemas-upnp-org:device:MediaRenderer:1
Using network interface eth0
Scanning for resources matching urn:schemas-upnp-org:device:MediaRenderer:1
Showing "available" messages
resource available
USN: uuid:59B5395B-964B-6407-1766-FAF9119BA84A::urn:schemas-upnp-org:device:MediaRenderer:1
Location: http://192.168.1.97:9000/plugins/UPnP/MediaRenderer.xml?player=aa%3Aaa%3Ae5%3Ae0%3Acc%3A52
resource available
USN: uuid:13e29454-0be1-1f32-8345-44efbf4134a1::urn:schemas-upnp-org:device:MediaRenderer:1
Location: http://192.168.1.124:2870/dmr.xml
resource available
USN: uuid:66b238ba-74df-fc7c-f1bd-40a8f0500176::urn:schemas-upnp-org:device:MediaRenderer:1
Location: http://192.168.1.97:49152/uuid-66b238ba-74df-fc7c-f1bd-40a8f0500176/description.xml
resource available
USN: uuid:B7B9D386-7FFD-B74D-95DC-A27827CDA310::urn:schemas-upnp-org:device:MediaRenderer:1
Location: http://192.168.1.97:9000/plugins/UPnP/MediaRenderer.xml?player=bb%3Abb%3A13%3Aec%3Ac0%3A0a
resource available
USN: uuid:15F218BE-5843-BF1D-9A64-F88BDF885725::urn:schemas-upnp-org:device:MediaRenderer:1
Location: http://192.168.1.97:9000/plugins/UPnP/MediaRenderer.xml?player=aa%3Aaa%3A1d%3A49%3A92%3Aec
resource available
USN: uuid:B29073B6-9259-CF73-DBFA-6C49C9A0956D::urn:schemas-upnp-org:device:MediaRenderer:1
Location: http://192.168.1.97:9000/plugins/UPnP/MediaRenderer.xml?player=bb%3Abb%3A10%3Ae8%3A2c%3A0a
resource available
USN: uuid:BE7D3264-C814-A047-BC75-3D7C415B51D6::urn:schemas-upnp-org:device:MediaRenderer:1
Location: http://192.168.1.97:9000/plugins/UPnP/MediaRenderer.xml?player=aa%3Aaa%3Ade%3Afe%3Aaf%3A21
resource available
USN: uuid:211a6207-0903-0470-69fb-544810e82c0a::urn:schemas-upnp-org:device:MediaRenderer:1
Location: http://192.168.1.199:49152/uuid-211a6207-0903-0470-69fb-544810e82c0a/description.xml
resource available
USN: uuid:F88997D2-3ABF-DFC7-1A67-299C70CFBF7C::urn:schemas-upnp-org:device:MediaRenderer:1
Location: http://192.168.1.97:9000/plugins/UPnP/MediaRenderer.xml?player=bb%3Abb%3Abf%3A41%3A34%3Aa1
HP:
volumio@volumioe30ii:~$ gssdp-discover -i eth0 --timeout=3 --target=urn:schemas-upnp-org:device:MediaRenderer:1
Using network interface eth0
Scanning for resources matching urn:schemas-upnp-org:device:MediaRenderer:1
Showing "available" messages
resource available
USN: uuid:B29073B6-9259-CF73-DBFA-6C49C9A0956D::urn:schemas-upnp-org:device:MediaRenderer:1
Location: http://192.168.1.97:9000/plugins/UPnP/MediaRenderer.xml?player=bb%3Abb%3A10%3Ae8%3A2c%3A0a
resource available
USN: uuid:13e29454-0be1-1f32-8345-44efbf4134a1::urn:schemas-upnp-org:device:MediaRenderer:1
Location: http://192.168.1.124:2870/dmr.xml
resource available
USN: uuid:BE7D3264-C814-A047-BC75-3D7C415B51D6::urn:schemas-upnp-org:device:MediaRenderer:1
Location: http://192.168.1.97:9000/plugins/UPnP/MediaRenderer.xml?player=aa%3Aaa%3Ade%3Afe%3Aaf%3A21
resource available
USN: uuid:59B5395B-964B-6407-1766-FAF9119BA84A::urn:schemas-upnp-org:device:MediaRenderer:1
Location: http://192.168.1.97:9000/plugins/UPnP/MediaRenderer.xml?player=aa%3Aaa%3Ae5%3Ae0%3Acc%3A52
resource available
USN: uuid:66b238ba-74df-fc7c-f1bd-40a8f0500176::urn:schemas-upnp-org:device:MediaRenderer:1
Location: http://192.168.1.97:49152/uuid-66b238ba-74df-fc7c-f1bd-40a8f0500176/description.xml
resource available
USN: uuid:F88997D2-3ABF-DFC7-1A67-299C70CFBF7C::urn:schemas-upnp-org:device:MediaRenderer:1
Location: http://192.168.1.97:9000/plugins/UPnP/MediaRenderer.xml?player=bb%3Abb%3Abf%3A41%3A34%3Aa1
resource available
USN: uuid:B7B9D386-7FFD-B74D-95DC-A27827CDA310::urn:schemas-upnp-org:device:MediaRenderer:1
Location: http://192.168.1.97:9000/plugins/UPnP/MediaRenderer.xml?player=bb%3Abb%3A13%3Aec%3Ac0%3A0a
resource available
USN: uuid:15F218BE-5843-BF1D-9A64-F88BDF885725::urn:schemas-upnp-org:device:MediaRenderer:1
Location: http://192.168.1.97:9000/plugins/UPnP/MediaRenderer.xml?player=aa%3Aaa%3A1d%3A49%3A92%3Aec
resource available
USN: uuid:211a6207-0903-0470-69fb-544810e82c0a::urn:schemas-upnp-org:device:MediaRenderer:1
Location: http://192.168.1.199:49152/uuid-211a6207-0903-0470-69fb-544810e82c0a/description.xml