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Thx! Got it - finally. I guess the extra arduino was partially needed to offload the raspberry from having to bitbang the rf data line, as the raspberry's uart is already reserved for the connection to the motor controller arduino. Ingenious design for sure. Just watched S2E4 of Luther but unravelling this is more thrilling.
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well, the raspberry just can't receive RF from userspace reliably. It drops a lot of packages. So maybe with a kernel module it's possible, however this way offloads the RF receiver completely. The arduino does a few other useful tasks as well, and can even decode IR for example eliminating the complicated programming procedure of LIRC. The arduino also can provide an additional serial port for nmea data.
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Yeah I would have thought these rf modules would come with some convenient i2c interface but for some reason that does not seem to be the custom.
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I improved the description of filling remotes in the initial post.
Jean-Marc
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I tried to improve the translation of the initial post and added the link to the stl files
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I modified the initial post to propose a new solution to improve the waterproofness and guarantee the reliability of the keys. The new method also makes it possible to replace the batteries. See the first post.