Evohome / Evotouch Wireless protocol?

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Re: Evohome / Evotouch Wireless protocol?

Postby colintd » Tue Oct 17, 2017 11:22 am

dty> Sorry about very slow reply! Yes, the second UART is wired to the async data wires on all the current busware modules. It wasn't on the very old COC module, but is a fairly easy patch is needed.
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Re: Evohome / Evotouch Wireless protocol?

Postby colintd » Tue Oct 17, 2017 11:28 am

The schematic for the latest CUL module is on the busware website here http://busware.de/tiki-download_file.php?fileId=43
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Re: Evohome / Evotouch Wireless protocol?

Postby kiwi3 » Sun Oct 29, 2017 10:03 pm

hox wrote:Continuing the last post.

I inverted the signal after the sync FF00 plus additional 2 bits (ff008) to get
aaaaaaaaaaaaaaaaaaff00833555355a9a96a966569aa565aa6a966569aa565aa6695a699696a9
so I get the sync bits 335553
After the 29th byte I make a Manchester decoding:
0ee7946f13de51bc4f58da6791eb7b98a7b40000000
At this point I could not decode futher like it is in https://www.domoticaforum.eu/download/file.php?id=1396

Also the RFBee and CUL data showed different results.

The SDR work was a test only, to see real data of the CC100 RF output.
In the end I'm interested in an Arduino + CC1100 modul.
Does anyonyone have a running Arduino-Code which communictes with EVOtouch


Hox

Hi Hox,

Think you have a couple of problems;
- You shouldn't invert
- bit length = 26us . Not sure if you have that correctly set
- remove preamble (including start/stop: 01111111110000000001011001100101010101010110010101)
- remove end of block (excluding start/stop: 10101100)
- remove start(0) and stop(1) bits surrounding each sequence of 8 bits (1 byte)
- per byte: reverse the order (LSB first). e.g. 10011010 becomes 01011001
- after doing all that, manchester decode

that should get you going.
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Re: Evohome / Evotouch Wireless protocol?

Postby hox » Tue Nov 07, 2017 8:25 pm

Thanks kiwi3,
your recipe was realy gooood.
I thought, start and stop bits are only used in RS323 serial comunications and should not be in the wireless comunication
seen by SDR.

Also my idea was, the start and stop bits comes in only by the serial comunication of the cc1101 and the MCU (SPI interface).
As honeywell uses manchester coding the start and stop bits are hardly to be seen in the data stream.

Thanks for your support kiwi3.

hox
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Re: Evohome / Evotouch Wireless protocol?

Postby Alkemist » Thu Apr 05, 2018 1:56 pm

Hi, Sorry to jump in uninvited here.
I have an interest in the evohome protocol and am looking for a document mentioned here in several posts called TridiumEuropeResource_honeywellevohomedriver_1354788406.pdf
It is no longer available on the Tridium website. Would any of you good gentlemen have a copy you could PM me with or point me in the right direction.

My interest is in looking at a range extender for the system,


many thanks
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Re: Evohome / Evotouch Wireless protocol?

Postby CaptNemo » Sun Apr 22, 2018 9:24 pm

Chris if you can create a range extender I would be interested. Cannot believe Honeywell isn't making one....
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Re: Evohome / Evotouch Wireless protocol?

Postby DanD » Thu May 10, 2018 7:20 pm

Hi,

Can you access this link to the Tridium doc OK?

yumpu.com/en/document/view/50032896/nia ... ium-europe

I've messed with creating a battery powered standalone repeater using an RFBee with some pretty simple modifications to the Evohome firmware developed by others. It's a couple of years since I worked on it and it was just a simple proof of principle device, but I can try and track down further details if you're interested. As far as I can remember, I had to mess a little with timings as many of the Evohome devices have a sleep/wake cycle that you have to deal with, but I think that it wasn't too time critical.

Dan
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Re: Evohome / Evotouch Wireless protocol?

Postby ernst » Mon Nov 05, 2018 9:45 pm

I've created a simple luaradio script to receive/decode the evohome wireless data using a cheap RTL-SDR from the information found in this threat.
It will output the raw and decoded packets to UDP which can be further decoded using any of the other utilities.

If anyone's interested the code is at https://github.com/ernst-s/luaradio-evohome
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