In the system that I'm trying to create there is a controller program and a client program. The controller sends data to AWS and AWS then sends it to certain client(s) (I'm using SNS and SQS)

I'm currently able to get the controller to send it to the clients however I am having trouble figuring out a way in which the controller can know which clients are online and then choose any number of the online clients that will receive the data it sends out.

What kind of Services could I use to accomplish this task?

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