I'm looking to do some research into the actual messaging used by powerline adapters. I'm aware of the standards, but I'm specifically looking to see where real devices deviate from the standard, and how they might be played with from a security standpoint.
What's a sensible way to interface with the powerline adapters safely? I envision some kind of high-pass filter on the mains which pulls out just the HF components (>1MHz), but then I'm not entirely sure what kind of voltage levels the resultant signal would come out at. I'm looking to translate them down to save levels (e.g. ±1V) for analysis.
Is there a simpler option, perhaps a chipset that can be interfaced with from a microcontroller that supports direct messaging rather than an Ethernet abstraction?