42 Design and development of building automation systems, building access control systems, building HVAC systems, building power monitoring systems, building video surveillance systems, building lighting systems, security and fire systems, personal safety systems, and patient wandering and infant monitoring systems; design and development of computer hardware, firmware, and software; design and development of computer hardware, firmware, and software in the field of building automation systems, building access control systems, building HVAC systems, building power monitoring systems, building video surveillance systems, building lighting systems, security and fire systems, personal safety systems, and patient wandering and infant monitoring systems; Software integration services; Installation, repair, and maintenance of computer software; consulting services and providing information in the field of design and development of building automation systems, building access control systems, building HVAC systems, building power monitoring systems, building video surveillance systems, building lighting systems, security and fire systems, personal safety systems, and patient wandering and infant monitoring systems