urh

Love these write-ups, i have various 433mhz things around the home that i’ve integrated with home assistant. Probably the most useful is still a bbq thermometer with multiple probes. Anyway i was going to post my favourite tool in this space https://github.com/jopohl/urh universal radio hacker just makes the process trivial, but i see the repo is marked archived now. Either way, the software is excellent.

Author should have used Universal Radio Hacker instead. https://github.com/jopohl/urh It’s an amazing tool. In less than an hour I decoded my RF remotes for the fans in my house. Whipped up a Python script (without external modules) that transmits a modulated carrier using HackRF. Now I can control fans (with lights) with scripts. URH also really good at recognizing the pulse durations and repetitions. All crude RG devices aren’t even ASK, it’s really OOK. The receivers don’t have an ADC!

You don't need a license to explore and have fun. Cheap, firmware hackable HTs are hawt, in particular the Quansheng UV-K5,K6. Tons of SDR receivers out there to explore, and many extremely exiting transceiver projects out there also. Just so much: https://github.com/jopohl/urh http://websdr.org/ http://kiwisdr.com/public/ https://meshtastic.org/docs/hardware/devices/

>> or somewhat expensive and complex SDR I don’t think that’s as accurate today as it used to be. On the hardware side there are tons of options very cheaply available - iirc the flipper uses the c1100 (or a number like that) it’s a popular cheap chip and it’s well documented and interfaces easily with arduino. More accessibly, lime mini SDRs are cheap but there’s quite a few alternatives too. On the software side GNU Radio is free with decent tutorials - we’re not talking anything like blender levels of difficulty to adopt even if it is a complex domain. Although on the more accessible side, urh is incredibly powerful given how easy to use it is https://github.com/jopohl/urh I used the latter to tap into a 2 channel wireless bbq thermometer via a $10 rtl sdr and that was a breeze, an absolute walk in the park compared to when I reverse e

Really enjoyed reading this. When i first stumbled across https://github.com/jopohl/urh (universal radio hacker) i couldn’t believe my luck. I’ve done stuff like this manually before (as in just collecting all the bits and then trying to ascribe meaning, e.g. https://github.com/cleanflight/cleanflight/issues/1125#issue... ) but i used URH to reverse my bbq temperature sensors. I have an alexa skill that shows the last 20 readings for both probes on a graph. It is stupidly over-the-top (a Pi with a cheap sdr dongle listens for packets from the bbq down the garden, it parses out the measurements and fires them into a dynamodb which is absurd but it was quick to do, then the Alexa skill just pulls from there and sends to a chart api that draws my line graphs to show on alex’s screen - totally absurd) but great fun to do.

Not quite what you are describing, but Universal Radio Hacker is a useful tool for reverse engineering protocols. https://github.com/jopohl/urh