- Posts: 3
Support for Graupner HoTT
- Waschtl
- Topic Author
- Offline
are there any plans to support the Graupner HoTT Rx system?
Is this even widely known outside of Germany?
Thanks for your help,
Bastian
Please Log in or Create an account to join the conversation.
- victzh
- Offline
- Posts: 1386
So, don't hold your breath.
Please Log in or Create an account to join the conversation.
- Wene001
- Offline
- Posts: 277
SJ/Graupner ESCs are plug and play with Hott Receivers and are sending
Voltage/Ampere/RPM/Capacity/Temperature
without using external hardware
Please Log in or Create an account to join the conversation.
- Waschtl
- Topic Author
- Offline
- Posts: 3
cgi.ebay.de/ws/eBayISAPI.dll?ViewItem=&i...bayCategoryId=159499 )
That's actually quite cheap to the Futaba modules which start at ~100€...
I can of course help to get a module for development
Please Log in or Create an account to join the conversation.
- victzh
- Offline
- Posts: 1386
PhracturedBlue has much more experience with CC2500 and I know there were some problems with CC2500 modules - some work better than others for unknown reason.
Also, for every protocol there are no guarantees that it can be done easily. I was lucky so far, all three protocols I dealt with are not very complicated and not much countermeasures were taken against reverse engineering. Unlike for instance DSMX - it took long time to reverse engineer frequency hopping algorithm.
Please Log in or Create an account to join the conversation.
- Waschtl
- Topic Author
- Offline
- Posts: 3
Volunteers welcome!
Please Log in or Create an account to join the conversation.
- PhracturedBlue
- Offline
- Posts: 4402
As victzh said, this is a pretty expensive proposition. Someone doing the analysis would need access to both a Tx and and Rx, and may need to damage one or the other to get the proper wiring to snoop the protocol. And in the end, if they developed a strong hopping algorithm, it may be very difficult to decode (Even DMX, which was the hardest protocol we've seen to date, could have been much more difficult with a single change like using a key-exchange, which would probably have been enough to make it unbreakable using current techniques)
At $65, I'd consider buying an Rx to hack, but without a reasonably priced Tx, it wouldn't be helpful.
Please Log in or Create an account to join the conversation.
- vlad_vy
- Offline
- Posts: 3333
Please Log in or Create an account to join the conversation.
- huge
- Offline
- Posts: 9
Regards
Please Log in or Create an account to join the conversation.
- SirDomsen
- Offline
Best regards
Domsen
Please Log in or Create an account to join the conversation.
- planger
- Offline
It's only 2 channels but it might give a start to reverse this protocol. I'll have a look in the coming days to see if the CC2500 SPI bus is accessible in it.
Depending on the result I might need a normal receiver to go further, is someone willing to ship a RX my way? I would even think that it could even be a prerequisite for me before starting anything...
- Pascal
Please Log in or Create an account to join the conversation.
- Fernandez
- Offline
- Posts: 983
Maybe in case you like hacking at some point we could add the Semtech Modules, for 900mhz as that would be really adding something what is lacking! Especially frsky r9m rx are very afdordable, if it was deviated would certainly use it.
Please Log in or Create an account to join the conversation.
- SirDomsen
- Offline
I would like to ship the receiver to you if it's of use
There is a problem that I see though:
Since HOTT uses Telemetry only to configure the receiver, there is a GUI needed to do so. I guess without the support of this configuration menu, there is not much of use of HOTT. I didn't know about this circumstance before I actually used HOTT. I helped Silverxxx from Silverware to implement Graupner's SUMD, that's why I have had contact with it...
Please Log in or Create an account to join the conversation.
- planger
- Offline
What are they configuring through telemetry on the RX?
Please Log in or Create an account to join the conversation.
- SirDomsen
- Offline
Just read around a bit in the Graupner receiver and/or transmitter manuals, they always show that telemetry menu
I can do a video of that menu if it's of use
Please Log in or Create an account to join the conversation.
- planger
- Offline
Please Log in or Create an account to join the conversation.
- Home
- Forum
- Development
- Protocol Development
- Support for Graupner HoTT