I didn't say release feature source code nor code of others feature solutions. What I said was release the code used to decode the signals sent over poe to the recording equipment. That is almost certainly client side code and probably only a codec at the end of the day. As it's almost certain the features are implemented camera side via hardware / firmware otherwise if client side they'd already be universal, all they'd be releasing potentially is their own poe stream decoding solution.
there is no such thing as signals sent over POE to the recording equipment

POE is a Power over Ethernet standards.. except some negotiation for power, it simply sends 48V over CAT5 cable

Dahua NVRs and IPCs are using many protocols, all over classic TCP/IP (or UDP/IP in case of P2P), which are sent over Ethernet (or WIFI). As each computer and device on internet.
You are probably are talking about Dahua Private Protocol. Protocol name says Private, but Dahua offers SDK with documentation to it after signing NDA. So you can write own apps for it (and I know one written in Poland).
One more time - it's not up Dahua, how the situation in CCTV apps world looks.
Everything is around ONVIF, everything supports only basic features.
No one wants to implement manufacturers private protocols, features or technologies. Too many brands & features.
Both HIK & Dahua are in very difficult spot. Both are 'excommunicated' by the US and many western governments (due China situation).
They have big market share but investing into them by western companies / developers is very risky.
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