I was responding to:
> With a hardware switch, none of that malware will survive a reboot of the device.
A reboot of the inverter would not prevent a supply chain attack using MPPT measurement electronics for an optical backdoor channel.
The hardware backdoor channel is present anyway because MPPT needs it.
The software can abuse the measurements to listen for optically transmitted commands.
I was responding to:
> With a hardware switch, none of that malware will survive a reboot of the device.
A reboot of the inverter would not prevent a supply chain attack using MPPT measurement electronics for an optical backdoor channel.