I always assumed this was true, too. Seems like the simple, obvious way Bluetooth communication works. You send data out into the world, and any paired device can receive it… Until my last transmitter, that is. I’m starting to believe that it actually is sending separate signals to different devices. Maybe as part of the ever-increasing security mechanisms?
I noticed my phone is always lagging on the readings. My pump gets them about a minute sooner. I suppose this could easily be explained by a slow phone, if it was the only indicator. My last transmitter died prematurely under warranty still. I could see the terrible battery output in Xdrip and knew it was dying. For about two weeks before the failure, it just absolutely refused to communicate with my phone, but still sent readings to my pump. I could query the transmitter stats, but not receive any new data. None of the troubleshooting worked. I even uninstalled Xdrip and tried to start over fresh, with nothing to show for it. As soon as I plugged in the new transmitter, though, my phone was back in business as my second collector. I swear, the transmitter was selectively and specifically sending data to the medical device and not the extraneous one, to conserve battery.