controlX2
controlX2 copied to clipboard
jwoglom
Update to v7.7 Changes Pairing code Format
Just wanted to let you know. If anyone updates their pump to work with the Dexcom G7, the software update to the pump changes the pairing code to a 6-digit code similar to 2FA codes. The code is only good for 5 minutes at a time for each G7 sensor.
This has been on my radar (once it was mentioned in the early launch announcement), but I only got access to the G7 update earlier this week and haven't updated yet. I will investigate the protocol changes and their impact on the project once I've updated my pump.
The latest Tandem update does break the connection with ControlX2. I recently updated and am now unable to get this working again. Hopefully an update can fix this.
I've updated my pump and good news: the core protocol has not changed. The pump reports ApiVersionResponse[majorVersion=3,minorVersion=2] as its API version and still appears to use the same basic auth protocol. I think the main change necessary is just to reverse engineer how the 6 character code gets translated into a 16 character code which is then sent over the wire via HMAC. I'll report in this thread when I have any further findings about this,.
@NethCoder @aaroecker the 6-digit pairing code system has been successfully reverse engineered! It ended up being much more complicated than initially expected: Tandem rewrote the entire pairing protocol using JPAKE. Please try it out and let me know if you run into any issues.