Better will be when use only your addon SDK… Unlock door works very very fast than cloud… I believe that maybe you some create to support callstatus for my model… Maybe HikVision helpyou. Because callstatus also works when user app on windows IVMS-4200 and when door ring i have a status in IVMS-4200 on PC…
In my door station i have latest FW available and no longer support by HikVision… My door station DS-KV8102-IM FW V1.5.1 Build 190613