So others may know this already but I’ve never seen it anywhere and if it’s mentioned in the instruction manual it must be buried pretty deep. Backstory is that my most recent transmitter has been plagued with Bt dropouts, like 3-6 per day, rather than the occassional one or two per week I’m used to. But even those less frequent dropouts may have a similar cause. To wit, at least on an iPhone, when you pair up a new transmitter, the old pairing remains stored in BT settings even though one of the partners is no longer “alive” so to speak. They don’t clear automatically. So unless you manually go in and “forget” them, the old connections build up and the transmitter starts having trouble sorting through the when it does its 5-minute connect-and-send. I don’t have the software code to look at, but I’m guessing the transmitter just has limited time and resources for making the connection, so the more of this cruft you have, the more it has to sort through and the more dropouts you’re going to run into.
I suspected this might be the case because I’d built up a lot of these DexcomXX id’s in Settings -> Bluetooth on my iPhone. Five, in fact. So I figured, hey, maybe I should unpair some of those things! But there’s the rub: which are the old ones? Because you don’t want to unpair the active one, that’s going to cause a lot of problems. So how do you know? I looked at the transmitter SN but at first I didn’t see it, because the bit it uses for the BT designation is actually at the end. It was actually kind of a D’oh! moment, but it’s not that obvious, so I thought I’d share it here, maybe save someone else some aggravation. It goes like this:
Dexcom SSN: - - - - AB
Bluetooth ID: DexcomAB
So if you’re having a lot of dropouts, or even just a few, find out if you’ve got a whole stack of these in your BT settings, like
DexcomWW, etc etc
And just go in and “forget” all of 'em except that AB one.
The OTHER thing of course is just to remember to unpair your old one as part of the routine when about to pair a new one. Then this pesky Bluetooth build-up won’t happen!