For my Model 3, the EVSE unit is attached about every other day. I set the start time for after midnight and usually rate of charge for 22A. My 240v, 14-50 outlet will easily support 40A. When choosing 22A, dose the car "communicate" with my EVSE or is this thru the duty cycle PWM? I ask, because I'm trying to understand how another after market EVSE would work. I also monitor the status using my phone App; Is this again a communication with my car or my EVSE?