The string you provided is a specific type of Google Dork —a search query used to find vulnerable or publicly accessible internet-connected devices, in this case, network security cameras Breakdown of the Query
mode=motion: Targets the live video stream mode of the camera interface. inurl+viewerframe+mode+motion+hotel+extra+quality
robots.txt to disallow crawling of /viewerframe paths, though this is not a security measure—authentication is required.viewerframe software often contains known vulnerabilities.port:80 "viewerframe" (more controlled).