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pathetic piss kitten @kitten@elizabeth.cat
9mo
kitten playing with trackers okay, so, my tinkering with Bluetooth beacons/trackers begins

I bought a bunch to be able to play around and see which one its holder likes the most
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pathetic piss kitten @kitten@elizabeth.cat
9mo
kitten playing with trackers first contender: nrf51822 (like almost all the boards), with an incorporated SHT30 temperature and humidity sensor, using a CR2032 battery

this one is my favorite for the moment, both because of the neat small form factor, and because the seller provides the pinout for the board... except mine doesn't match any of the ones they provide..but I asked them, see if they can provide it.

a.aliexpress.com/_EJjjOxI
small black PCB with a nrf51822 microcontroller in it and a small button in the center
the board inside its white plastic case, with a blue plastic button, in my hand
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pathetic piss kitten @kitten@elizabeth.cat
9mo
kitten playing with trackers the second, another nrf51822, this time by itself, and this time using a CR2477 battery

this one... is not looking good. it's just too big, and that's with half the PCB empty. besides, the case has no way of attaching it to anything

it does have an upside though: I found the datasheet in the internet, with the pinout. not only that, it has 4 available digital I/O pins, which means: potential

a.aliexpress.com/_EHqjtVA

www.holyiot.com/tp/2019042814310092401.pdf
big black PCB with a chip in the middle, marking "N51822" barely visible
the chip in a big bulky black round case, in my hand
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pathetic piss kitten @kitten@elizabeth.cat
9mo
kitten playing with trackers the third one, also nrf51822, this one is a bit weird... two button, and it's clearly a devboard embedded in a larger PCB. also CR2477

I found sort of a pinout, and it has plenty of gpio available... the case is weird though, no easy way of attaching it to anything, although it has some holes in it that could be used

a.aliexpress.com/_EGPL3pO
weirdly shaped black PCB, with a chip in the middle marked N51822, and a button on its side
the PCB in its transparent case, in a similar weird shape
the pinout for the devboard. with the antenna on the top, and the chip facing the viewer, the left side is: ANT, P0.22, P0.23, P0.24, P0.00, P0.01, P0.02, P0.03, P0.04 and the right side: P0.18, SWCLK, SWDIO, P0.16, P0.15, P0.12, P0.08, GND, VCC
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pathetic piss kitten @kitten@elizabeth.cat
9mo
kitten playing with trackers oh no I messed up the order of the posts here
This note is quoting social.elizabeth.cat/notes/ahaqq3007zwjgx7g
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pathetic piss kitten @kitten@elizabeth.cat
9mo
kitten playing with trackers update for tracker : pinout found and someone already tried stuff in it

github.com/seemoo-lab/openhaystack/issues/35#issuecomment-828338751
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pathetic piss kitten @kitten@elizabeth.cat
9mo
kitten playing with trackers I'm wondering which network will work better here, Google's or Apple's ​:neocat_think:​
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pathetic piss kitten @kitten@elizabeth.cat
9mo
kitten playing with trackers okay, so, flashing attempt !

first of all, I need to solder those cables on the tag's pins, let's see how it goes

(I should clean that mat, I know)
my desktop, with a black mat, and on top of it some soldering supply, a soldering iron, the Bluetooth tag, and some jumper cables cut in half
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pathetic piss kitten @kitten@elizabeth.cat
9mo
kitten playing with trackers well, after a lunch break, and after getting up to speed after so much time without soldering, I think I got it

(btw, every time I try to use a soldering tip that isn't the BC2 I end up regretting it)

let's see if that's good enough
tag #1 with half jumper cables soldered to the 4 relevant pins
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pathetic piss kitten @kitten@elizabeth.cat
9mo
kitten playing with trackers aaaaand it seems it worked!! I made a backup of the firmware originally in the tag. let's write OpenHaystack's one
three terminal windows with OpenOCD running in one, a telnet session where I communicate with the tag, and queried a backup in other, and the hexdump of the dumped firmware in the third
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Lis (≙) retired account @lis@luisa.is
9mo
kitten playing with trackers @kitten neocat_chew_wire
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Maaike 🔜 eth0 @ayke@blahaj.social
9mo
kitten playing with trackers @kitten that flux looks like a nail polish bottle?? Didn't know they made flux like that, seems handy.
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pathetic piss kitten @kitten@elizabeth.cat
9mo
kitten playing with trackers @ayke yes! very handy indeed
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Maaike 🔜 eth0 @ayke@blahaj.social
9mo
cursed, don't @kitten now I need to empty a nail polish bottle to use for this purpose
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pathetic piss kitten @kitten@elizabeth.cat
9mo
cursed, don't @ayke ​:blobCat_eyes:​
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Maaike 🔜 eth0 @ayke@blahaj.social
9mo
kitten playing with trackers @kitten I was actually looking into whether I could reimplement the Google system. Might do that, there's code for that online:
github.com/leonboe1/GoogleFindMyTools/blob/main/ZephyrFirmware/README.md
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pathetic piss kitten @kitten@elizabeth.cat
9mo
kitten playing with trackers @ayke ​:neocat_laptop_notice:​
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