How many receivers are active at the moment?

Can you tell how many receivers are online on a global basis. Do have receivers a “heartbeat” you can activate?

I have no information on the actual number of active devices. The ‘heartbeat’ (which is sent to is only active on a few of our test boxes. An updated firmware with monitoring (hearbeat) daemon will be rolled out by the end of next week, so we may have some idea about the number of devices.