title: Number of clients connected to AWS IoT MQTT topic
body: <p>We developed an iOS application and configured the app to listen to all the messages published on a particular MQTT topic on AWS IoT.</p>
  
  <p>All I want to know is, is there a way where I can pull a list of connected devices who are listening on that topic ? (I checked the cloudWatch logs and I couldn't find the detailed info like the MAC address of the device connected etc). </p>
  
  <p>Also, I want to know if there is limit on the no. of devices that can be subscribed to a topic.</p>