ANT Forum

Hi,
I've just bought an Ant+ system :i-genius from tacx.
On the box I've seen the Ant+ logo.
I would like to know if there is a way to spy the data exchanged between the trainer and the software.
In first step I need to spy them to show them on another system.
In second step I need to drive the trainer directly with the other system.
I've contact Tacx support but they have no information about that.
Thanks you


     

To my best knowledge the TACX trainers don't follow any public ANT+ profile (except for receiving heart rate from an ANT+ hr belt and power from an ANT+ power meter). Transfer of control messages and measurement data follows a private protocol on top of ANT transport.

If Tacx say they can't (won't) tell you details of that protocol, there's no legal way to "spy" these communications.

Cheers,
OMB      

Hi,
Ok I was waiting this kind of answer .
The support Tacx only tell me that they don't know how to do this.
Actually I don't have a look about the ANT+ protocol and profile system.
Maybe it is not as protected as you tougth ???
Thanks you
     

Hi sdecorme,

OMB's answer is correct. You cannot legally spy on the Tacx *trainer* data and/or control the trainer - as this is not ANT+. (It's just ANT, i.e. proprietary)

The ANT+ logo you see on the box will refer to other ANT+ device profiles: e.g. Heart rate, Speed, Cadence.

You can check which device profiles the trainer that you have supports here: http://www.thisisant.com/directory/filter/173/~/~/

You can decode the ANT+ data for these device profiles easily, as you can access the ANT+ Device Profiles on the downloads page.

Kat      

Hi Kat,
Thanks you for this answer.
What do you mean it is not ANT+ just ANT.
It use the same stack but not the same protocol ?      

Hi Sdecorme,

See here:

http://www.thisisant.com/developer/ant-plus/ant-antplus-defined/

http://www.thisisant.com/developer/ant-plus/ant-plus-basics/

http://www.thisisant.com/developer/ant/ant-basics/

Cheers,

Kat