Minimed 770G / 780G communication protocol implementation, how to get started ?

[ondrej1024]

Hi all,

Medtronic has started distributing the Minimed 770G and 780G insulin pumps. Their communication protocol is based on Bluetooth. I would like to start implementing an open source protocol stack for these pumps. Anyone here knows if someone has already started with this ? Is their any documentation on the new protocol available ?

Cheers, Ondrej

[benceszasz]

@ondrej1024 maybe someone has started it, but not sure: NightscoutFoundation/xDrip#1473

[mohammed-nep-group]

Hi ondrej,

I was also already looking into this look over my issue otherwise : https://github.com/nightscout/cgm-remote-monitor/issues/6568

Would love to look it over with everyone, because I think there should be space to accomplish this.

[lynass]

There is a USB blue adapter 1003910 that connects to the 780G pump for users without a phone to upload data to carelink. This would seem like a good place to start. I have one of these devices and I could try to look at the data going over the usb connection so avoiding any of the bluetooth layer. If someone could give me a few pointers how to do this, it would be helpful.

[pazaan]

I originally used Wireshark for USB to inspect the traffic going over USB while chatting to CareLink.

[ondrej1024]

@lynass I would be interested to know if you have started looking into the BLE communication between the 780G and a PC and could share your results.

I think it would be worth the effort to develop an open source library which allows to communicate directly with the pump. I am not aware of any work going on to achieve this.

To get started I have developed a prototype of the M5Stack Minimed Monitor, which is based on the minimed-connect-to-nightscout project. While this seems like the easiest way to go, it is not the best solution. It relies on the entire Carelink Cloud infrastructure, which is not always a good thing.