Efficient control and/or linking of smart network connected devices. Some implementations are directed to rendering, within an active application that enables control of multiple smart devices from multiple parties, both: (1) an interactive graphical interface element that, when interacted with, causes corresponding control of smart device(s) of a third-party (3P); and (2) a selectable element that, when selected, causes execution of a deeplink to cause a 3P application to open in a state that presents additional information for the smart device(s). Some implementations are additionally or alternatively directed to, in response to determining that a application is installed at a client device, but a smart device topology lacks any entries for 3P smart devices of the 3P, efficiently adding one or more particular smart devices of the 3P to the smart device topology.