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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. Hector Martin‏ @marcan42 14 Apr 2020
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      You could reverse engineer a proprietary protocol. Or I guess you could just manually capture the cartesian product of all possible field values, and make a giant lookup table. Times multiple proprietary target encoding formats. Times dozens of devices.https://github.com/smartHomeHub/SmartIR/blob/master/codes/climate/1023.json …

      2 replies 8 retweets 58 likes
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    2. Hector Martin‏ @marcan42 14 Apr 2020
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      I was going to write a @home_assistant integration for my aircon. Then I found that project, and figured maybe I didn't have to. Still going to do it.

      1 reply 1 retweet 14 likes
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    3. Hector Martin‏ @marcan42 14 Apr 2020
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      I just... don't understand how multiple people contributing to a project end up (manually!) capturing thousands of IR codes from remotes to make this work and don't stop and think that there might be a better way.

      3 replies 0 retweets 26 likes
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    4. Andrea Rossetto‏ @brusarp 14 Apr 2020
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      Replying to @marcan42

      I'm interested ... is it possible in simple words to explain how it could be done? Isn't it necessary to try the keys one by one anyway?

      1 reply 0 retweets 1 like
    5. Hector Martin‏ @marcan42 14 Apr 2020
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      Replying to @brusarp

      Aircon remotes don't send keycodes, they have a screen and keep track of the current settings on the remote, then transfer the entire state to the aircon. The right way to do this is to reverse engineer the packet format and figure out where mode, temp, fan speed, etc go.

      2 replies 0 retweets 6 likes
    6. Hector Martin‏ @marcan42 14 Apr 2020
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      Replying to @marcan42 @brusarp

      These people are literally spending hours with each remote trying every possible speed setting times every possible temperature times every possible mode (and missing out on any additional features because some have so many combinations it would take weeks to capture them all).

      2 replies 0 retweets 3 likes
    7. Hector Martin‏ @marcan42 14 Apr 2020
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      Replying to @marcan42 @brusarp

      For reference, here is a quick emulator I wrote for my old aircon remote: https://mrcn.st/p/jUaSBl4E  It really isn't hard to work out the fields. You change the temp, see what changes; change the mode, see what changes; etc. Often you can get more modes than the remote supports.

      2 replies 0 retweets 1 like
    8. Jeffers‏ @Jeffers727 14 Apr 2020
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      Replying to @marcan42 @brusarp

      I've been doing a little reverse engineering lcm.. what's your approach to bytes that you can't decipher and don't seem to change, treat them as magic numbers?

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 15 Apr 2020
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      Replying to @Jeffers727 @brusarp

      A priori yes (e.g. 0x40, 0xff, 0xcc in that script), they are often going to be a device/maker code (effectively a magic number). Or if you feel adventurous you can try changing them and see if it does anything discernible.

      12:01 AM - 15 Apr 2020
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