Is it possible to intercept and record the raw Bluetooth data (my OWN data-NOT data belonging to anybody else) from a Dexcom One+ continuous glucose monitor sensor by using an ESP32/STM32 or any other platform?
I'm having to buy a separate receiver as my smartphone is not compatible (unless I want to treat myself to a new 5G phone for next Christmas). The receiver is not that expensive compared to the sensors (as the cost of sensors, if recurring, can add up). So, I was wondering if this data can be "Sniffed" or otherwise intercepted. Is anyone aware of any attempts (legal, of course) to do this? Thanks.
Might be possible, but to know for sure you'll have to know first which version of Bluetooth is used, then search for BT sniffer for your particular version of BT. Even if it's for your own device, depending of the local laws, extracting frequency hopping keys and alike (bypassing locked security features of any device), might be at least in the grey area of legality, if not worst.
There are 3 or 4 BT versions, all under the generic name "Bluetooth". The protocol+security features are very different with each version. Also, the device may choose the types of pairing, and may choose a less secure one, depending on what the device is, and the manufacturer's intent. I'm no BT expert, these is what I found a couple of years ago, while trying to revive a BT bracelet receiver for which the manufacturer company (and websites) went bankrupt.
I would expect the more recent the BT version, the harder would be to sniff that traffic. Might be easier to just buy a BT receiver for your BT version, and then interconnect that receiver with your phone or PC.