Add support for Car Remotes

[eshaz]

Add support for multiple car remotes / keyfobs.

See merbanan/rtl_433_tests#462 for decode samples and documentation.

Manufacturer / Model:

• Astroflex
  • Astrostart 2000
  • Astrostart 3000
• Alps
  • FWB1U545
• Audiovox
  • PRO-OE3B, AVX01BT3CL3 (FCC ID BGAOE3B)
• Code Alarm
  • FRDPC2002
• Compustar
  • 1WG3R-SH
  • 1WAMR-1900
• Continental
  • KR5V2X
• Chrysler
  • 56008761
  • 56008762 (FCC ID GQ43VT7T)
  • 04686366
  • 56021903AA
• General Motors
  • ABO1502T
• Microchip
  • HCS361
• Nidec
  • OUCG8D-344H-A
• Nutek
  • ATCD-1
  • APS99BT3BCF4, ATCH (FCC ID ELVATCD)
  • AVX1BS4, AVX-1BS4 (FCC ID ELVATCC)
  • A1BTX (FCC ID ELVATFE)
  • 105BP (FCC ID ELVATJA)
• Siemens
  • 5WY72XX
• Unknown
  • 6SC2

Resolves #2754

[zuckschwerdt]

Thanks! Simple decoders without value processing or checksums are best implemented as flex decoder confs, for examples see https://github.com/merbanan/rtl_433/tree/master/conf

For PWM Short and long need to be different, is your code that a typo?

E.g.

decoder {
    name=Audiovox-car-remote,
    modulation=OOK_PWM,
    short=550,
    long=1000,
    reset=1300,
    bits=37,
    get=
    get=@0:{16}:id,
    get=@16:{16}:code,
    get=@17:{1}:chk,
    get=@18:{4}:flags,
}

You can just add a documented conf to this PR.

[eshaz]

Thanks! Simple decoders without value processing or checksums are best implemented as flex decoder confs, for examples see https://github.com/merbanan/rtl_433/tree/master/conf

I have a few devices on the 433Mhz frequency already and just using the flex decoder was causing false positives. I added a few sanity checks here that removed the false positives:

rtl_433/src/devices/audiovox_car_remote.c

Lines 69 to 71 in d743eb6

	if (id == 0 || code == 0 || button == 0 || id == 0xffff || code == 0xffff) {
	return DECODE_FAIL_SANITY;
	}

[eshaz]

I've finished decoding / reverse engineering all of the keyfobs I have as mentioned in #2754. Let me know if there's any formatting or changes needed.

I also have this PR open: merbanan/rtl_433_tests#462 that documents and adds some sample data for these devices.

[eshaz]

@merbanan, @zuckschwerdt It's been almost a year since I've opened this PR. Just want to check in to see if needs any changes before merging.

[zuckschwerdt]

Just yesterday someone asked about HCS362 so this is interesting to some people. I'll try to review but this is really much code and not as plain as other decoders we have. Can you rebase and make sure that all files end with a linefeed?

At a quick glance the codes in the button_map's look too random. Are you sure that's not the codes for one specific sender?

[eshaz]

Just yesterday someone asked about HCS362 so this is interesting to some people. I'll try to review but this is really much code and not as plain as other decoders we have. Can you rebase and make sure that all files end with a linefeed?

@zuckschwerdt I've rebased against the current master branch and fixed the formatting.

At a quick glance the codes in the button_map's look too random. Are you sure that's not the codes for one specific sender?

Yeah I'm sure they are generic for each model. I have multiple examples of each device that I used to test with. Some of the remotes have multiple buttons that result in relatively complex bit-wise combinations. such as holding two or more down at the same time, etc.