This blog is about my spare time projects or stuff that matters to me such as electronics, reverse engineering, computer science, embedded devices, security or digital forensics. It is not affiliated to my employer in any way. Posts may be either in English or in French.
During the previous part, we were able to use GNU Radio and a Software Defined Radio (SDR) in order to receive and demodulate RF packets.
Now is the time to go a bit further: extract and decode packets and then, the counterpart, encode and send packets back.
Even though I will use my robot vacuum as an example, this blog post can be considered as a simple how-to about writing a simple packet sink in GNU Radio.
For those who want to read the whole story from the beginning, here are Part 1 and Part 2.
I haven’t talked about this project for a while but I was still working on it. So, what took me so long that I didn’t write about it?
Well, as I told you in Part 1, my final goal is to be able to control the robot vacuum with a GoodFET and a transceiver. The robot relies on an A7105 transceiver which is not directly supported by the GoodFET project and I don’t want to add support for it as I have already written code to support a Chipcon CC2500 transceiver that might be radio-compatible with the Avantcom one.
Knowing all the parameters we need by spying the configuration phase on the SPI bus from the remote control should have been enough to build another remote. But sometimes things don’t go well!
