Hacker News Board Hacker News, browsed like a classic message board
Live data from Hacker News

Python client for the $20 Colmi R02 smart ring

tahnok.github.io

Post reply on HN
Print view View original

21–30 of 125 posts

Re: Python client for the $20 Colmi R02 smart ring

#21

Post by gorbypark »

Galanwe wrote: post #18

Is there a similar ring with NFC? I have no use for the smart health thingies, which really look like a data driven health gimmicks to me. NFC on the other hand I could find hundreds of applications, from payment to access and transport cards.

They do exist, I believe. I don't have one but came across many for sale on AliExpress when looking for a writer to clone my RFID apartment door entry thingy. Seems like they even have some that are dual NFC/RFID that would work as regular NFC as well as for my apartment door (125khz).

Re: Python client for the $20 Colmi R02 smart ring

#22

Post by franga2000 »

Galanwe wrote: post #18

Is there a similar ring with NFC? I have no use for the smart health thingies, which really look like a data driven health gimmicks to me. NFC on the other hand I could find hundreds of applications, from payment to access and transport cards.

The problem with that idea is that all secure implementations of RFID lock the user out, meaning you can't just buy an NFC ring/fob/implant and copy your bank card or transit card onto it. The only implementations where the user can do that are terribly insecure and, while still commonly used, are slowly getting phased out.

So for anything other than systems you control or are good friends with the IT guy for, you're out of luck.

Re: Python client for the $20 Colmi R02 smart ring

#23

Post by daghamm »

Always42 wrote: post #5

At a quick glance this looks cool! I just have a hard time justifying things like this when the apple watch + iphone work so well. But i'm sure at some point the apple experience will get worse and push people to other OS like windows is

I dont understand this attitude.

If this is how you feel about technology why are you not on the verge instead of HACKER news?

Re: Python client for the $20 Colmi R02 smart ring

#24

Post by edent »

Galanwe wrote: post #18

Is there a similar ring with NFC? I have no use for the smart health thingies, which really look like a data driven health gimmicks to me. NFC on the other hand I could find hundreds of applications, from payment to access and transport cards.

Yes. I have the Z1 Ring.

Getting secure tokens (like payment, door unlock, etc) is possible but can be complicated. The ring is a small target, so not always easy to find the received if you're using it with a phone.

Oh, and the software is low level and finickity. I managed to accidentally set mine to read only mode permanently.

Review at https://shkspr.mobi/blog/2024/02/giving-the-finger-to-mfa-a-...

Re: Python client for the $20 Colmi R02 smart ring

#25

Post by Galanwe »

franga2000 wrote: post #22
Galanwe wrote: post #18

Is there a similar ring with NFC? I have no use for the smart health thingies, which really look like a data driven health gimmicks to me. NFC on the other hand I could find hundreds of applications, from payment to access and transport cards.

The problem with that idea is that all secure implementations of RFID lock the user out, meaning you can't just buy an NFC ring/fob/implant and copy your bank card or transit card onto it. The only implementations where the user can do that are terribly insecure and, while still commonly used, are slowly getting phased out. So for anything other than systems you control or are good friends with the IT guy for, you're…

Right I agree with you on theory. But in practice, I already do clone most of my smart cards on small NFC stickers on the back of my phone case.

The things is 99.9% of access cards (where I leave at least) are default-encrypted mifare classic, making cloning trivial. Transport cards are an other beast since they have their own backlog and proper encryption, but there are ways.

So all in all, dumping the card is not the issue for me, it's the medium on which to put the clones that is still a question mark.

The "NFC sticker on the back of the phone" is cool because it's almost as if your phone opens the door (stock android won't let me easily swap NFC SC ID), but NFC is fidgety when multiple chips are in close proximity, leading to frequent misses.

I have found multi-chips NFC cards on Ali Express. These are basically a single antenna wired to an array of chips directed by a keypad. That seems viable on paper but you still get to carry the card and press the right switch.

The ideal solution would be a smart ring with a reflashable NFC chip, along with a programmable MCU to implement the rolling logic between cards.

Re: Python client for the $20 Colmi R02 smart ring

#27

Post by karamanolev »

Flux159 wrote: post #11

This looks interesting - is there a comparable ring that also has a temperature sensor? It would be interesting to be able to determine if you're sick a day or two ahead like an Oura ring or Apple's new Vitals app for Apple Watch using an open source app. Alternatively, does anyone know if it's possible with the sensors just in this ring?

From my experience, RHR, sleeping heart rate and HRV are good indicators of when I'm getting sick.

Re: Python client for the $20 Colmi R02 smart ring

#30

Post by dsign »

The hardware is getting so cheap! But the software...

I bought for $20 a bed lamp that comes with led lights, bluetooth receiver, clock and alarm clock, and wireless charging for my iphone. It has a microphone to stream all my conversations god knows where, though its purported purpose is to listen me sing and pulse the lights according to the pitch.

It comes with a convenient app to set the clock and the lights. But due to a glitch in the software, the alarm goes off every night at 01:00 AM. I haven't been able to disable that via their official app; no real programmers were used making that thing. But there probably is a bug in their bluetooth stack that would allow me to become root of the lamp and fix it myself...if I had the time.

I wish hardware makers for off-brand products would include a minimal hacking kit in their boxes.

Post reply on HN