How do I use the carfob config for unknown fobs?

[Stefn Kurz]

Hey, I want to play around with my car keys and then maybe do a rolljam attack (I think I can do that as long as it's my car). I use rtl_433 with my hackrf one.  I'm not sure how to use car_fob.conf (https://github.com/merbanan/rtl_433/blob/master/conf/car_fob.conf) to detect and decode the signal.

there is no output when I press my car fob:

[sl rtl_433]# rtl_433 -c conf/car_fob.conf -d driver=hackrf -g LNA=36,AMP=14,VGA=42 -s 2M -f 434421000
rtl_433 version 20.02-19-g7a9bfd5 branch master at 202003252233 inputs file rtl_tcp RTL-SDR SoapySDR
Use -h for usage help and see https://triq.org/ for documentation.
Registered 123 out of 150 device decoding protocols [ 1-4 8 11-12 15-17 19-21 23 25-26 29-36 38-60 63 67-71 73-100 102-105 108-116 119 121 124-128 130-149 ]
[INFO] Opening HackRF One #0 909864c82d6e4bcf...
Sample rate set to 2000000 S/s.
Setting gain element LNA: 36.000000 dB
Setting gain element AMP: 14.000000 dB
Setting gain element VGA: 42.000000 dB
Tuned to 434.421MHz.
^CSignal caught, exiting!
[sl rtl_433]#

I would be happy if someone here could help me. Thanks Stefn

[Benjamin Larsson]

Run in analyzer mode -A. That should give you a description of the signal.

Regarding the legality you have to comply with the regulations covering
the frequency band and the intent of your actions.

MvH
Benjamin Larsson