There's application usage by client (over a defined period), you'd need to get a list of clients, for instance... https://developer.cisco.com/meraki/api-v1/#!get-device-clients ...and/or... https://developer.cisco.com/meraki/api-v1/#!get-network-clients ...then call for each client... https://developer.cisco.com/meraki/api-v1/#!get-network-clients-application-usage I guess in some contexts a switch/AP might count as a client (try it and see), but typically it'll be a connected end-user device that's the 'user' of the application and it could be connecting to multiple APs and/or passing through multiple switches.
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