Article <2nd4cj1s95e3nk3mut4j9g2f5morttdqde@4ax.com>

Warning: mysqli::__construct(): (HY000/1203): User howardkn already has more than 'max_user_connections' active connections in D:\Inetpub\vhosts\howardknight.net\al.howardknight.net\includes\artfuncs.php on line 21
Failed to connect to MySQL: (1203) User howardkn already has more than 'max_user_connections' active connections
Warning: mysqli::query(): Couldn't fetch mysqli in D:\Inetpub\vhosts\howardknight.net\al.howardknight.net\index.php on line 66
Article <2nd4cj1s95e3nk3mut4j9g2f5morttdqde@4ax.com>

Deutsch English Français Italiano

<2nd4cj1s95e3nk3mut4j9g2f5morttdqde@4ax.com>

View for Bookmarking (what is this?)
Look up another Usenet article

Path: ...!eternal-september.org!feeder3.eternal-september.org!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail
From: Jeff Liebermann <jeffl@cruzio.com>
Newsgroups: rec.bicycles.tech
Subject: Re: Jamming Shimano Di2
Date: Sun, 18 Aug 2024 11:21:17 -0700
Lines: 37
Message-ID: <2nd4cj1s95e3nk3mut4j9g2f5morttdqde@4ax.com>
References: <ona0cjlnpdmjv5c2r6nlm1ubb3mi4jqf55@4ax.com> <v9q3t0$1sfv4$10@dont-email.me> <opg1cj5kmiullu25leaaii4redindeohj4@4ax.com> <v9qj1f$1v8v2$4@dont-email.me> <o2q1cj5bb877tc764i1o9ddn5nnkhide5h@4ax.com> <v9sr4u$1v8v2$7@dont-email.me>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Trace: individual.net 6NYrjlYmnLe/hLJWqYmWJgUFm7X/DP0pxWLmAVrlSoABJLfk2T
Cancel-Lock: sha1:9RcK1TUk+dBowQLBySG1Z4voWzI= sha256:YWo4Yi9W1pyfOmp8vtCgsHzuAsWUjcHZvntR4rpmX+I=
User-Agent: ForteAgent/8.00.32.1272
Bytes: 2594

On Sun, 18 Aug 2024 08:58:05 -0400, zen cycle
<funkmasterxx@hotmail.com> wrote:

>You misunderstand. I didn't write that it was simplex. I wrote that it 
>was originally intended to monitor sensors rather than dynamically 
>control another 'slave' device. Of course some handshaking is necessary 
>in order to pair the components and maintain the link. As the technology 
>and popularity of the protocol has grown subsequent versions gave more 
>versatility for more control. I know I read that history somewhere, but 
>It's not popping up in my searches right now.

This might be of interest:
"Shimano DI2 Wireless Reverse Engineered"  (March 22, 2019)
<https://www.youtube.com/watch?v=25Kyh5im_ak>  (19:45)
Note that the Github page with the code is gone.  However, there are
some other interesting projects on his site:
<https://github.com/kwakeham?tab=repositories>
Following search results for "DiHack", I found this:
"DiHack.  Reverse Engineering the Shimano Private ANT Wireless
profile"
<https://github.com/cmoski/DiHack/blob/master/Onenote-notes.pdf>

>- Does wireless shift faster? yes, marginally.
>- Does wireless shift more accurately? Yes, but a properly set-up cable 
>system does just as well such that it's barely noticeable.

When races are won or lost by small fractions of a second, any
innovation that offers even a slight advantage is probably worthwhile.
Whether it's financially worthwhile depends on the sponsors
generosity.


-- 
Jeff Liebermann                 jeffl@cruzio.com
PO Box 272      http://www.LearnByDestroying.com
Ben Lomond CA 95005-0272
Skype: JeffLiebermann      AE6KS    831-336-2558