Y
ou’ve probably heard of Apple’s Find My
network protocol for offline finding. Now
implemented in over 1 billion devices, Find My
has enabled Apple to introduce the AirTag, a
low-cost, low-power location tracking beacon
with worldwide coverage, but without the need for
a GPS or cellular modem.
But did you know you can piggyback on the
Find My network with your own tracker? And
even transmit arbitrary data over the network? Or
operate in a special “stealth” mode to track your
belongings without alerting potential thieves?
This article will explain how the protocol works
and explore how this ubiquitous network can be
110
makezine.com
Understanding, (ab)using, and extending
Apple’s offline finding protocol Written by Fabian Bräunlein
SKILL BUILDER: Find My Trackers
FIND MY:
DIY AITAG
TRACKER
Fabian Bräunlein, OpehHaystack
MATERIALS
» ESP32-based development board such as
Huzzah32 Feather, Adafruit 3405
» USB power bank
» Cable, USB to Micro-USB
OR, FOR A SMALLER FORM FACTOR:
» nRF51822-based tracker/“iBeacon”
Search “NRF51822 beacon” on AliExpress.
» Coin cell battery for the tracker, e.g. CR2032
(if not included)
» SWD programmer e.g. J-Link EDU Mini, Adafruit 3571
TOOLS
» Computer with Mac OS X / macOS You can also
rent a cloud Mac from AWS or cheaper hosting
companies, or run a virtual machine with macOS
such as github.com/sickcodes/Docker-OSX.
M83_110-17_SB_AirTags_F1.indd 110M83_110-17_SB_AirTags_F1.indd 110 10/11/22 12:07 PM10/11/22 12:07 PM
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