Hmm, I want to use Sunny Boy internal and Sensata external AFCI with Tigo RSD. Those of course have a keep-alive transmitter.
I don't know what the signal is, could be a simple tone, or could be higher frequency modulated data like used for monitoring.
I would want AFCI to perform RSD, not sure if internal keep-alive transmitter does that, but could implement that for external.
I'm not sure most optimizers communicate for that function. They would have MPPT switching harmonics, but so do inverter/SCC.
Is their monitoring communication limited to a narrow band that could be notch filtered? Or unlike over the air, they don't think they need to coexist with other devices?