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The DLNA standard specifies four device types (see the Wikipedia page on DLNA):
At this moment netdisco discovers DMS and DMR devices as one, named DLNA.
Currently, Home Assistant is - as far as I know - only interested in DMR devices (as per home-assistant/core#14749). The component in home-assistant now needs to detect if the device is a DMR device.
If these device types are separated, home-assistant becomes less 'polluted' with checks for proper device types. Also, introducing a DMS component to home-assistant would not work with discovery, as the DLNA_DMR component already 'catches' the DLNA discoveries.
Also, there are 4 DMS and 3 DMR versions. Currently only version 1 of both is discovered. This pull request makes netdisco support the other versions.
Please do inform me before merging (and releasing) this! The DLNA_DMR component in home-assistant + discovery has to be updated as well.