What caused the housekeeper to open the door twice?

Network error, resulting in system failure. Ding Qian Internet has realized the digitalization, online and intelligence of the community through innovative technologies such as Internet of Things, cloud technology, big data and artificial intelligence. At the same time, by connecting more commercial services and public services, we will continue to empower property companies and service owners, provide faster and more satisfactory value-added services for community families, and create a new experience of smart communities.