Summary
SDR provides you with a very powerful (albeit relatively complex) way to interact with arbitrary radio signals used by your target embedded system. In this chapter, we were able to go over the hardware you may need, building simple antennas that fit the signal frequency you want to interact with and the different signal modulations. This is a complex field that will require you to study very actively its intricacies to be used to the fullest extent of its power (and pass certifications to be able to send signals) but will allow you to interact with the communications at a very intimate level.
In the next chapter, we will go back to tinkering with circuits and will look into the typical debug interfaces we can use to interact with processors.