Automation for public EV charging station

I have a very simple EV charging station maid by myself. It is one phase AC 220 volts 16 Amps, using connection j1772. To control, monitor and calculate consumption I’m using Sonoff LAN coolkit PSF-X67.
The problem is that I cannot create a good automation for it.

Tasks:

1. Notify me by phone that charging begins
2. Notify me by phone that charging complete
3. Record consumed kWt/h by each charging session

So, what I have at the moment:

1. To trigger I’m using power (sensor.sonoff_1000chfgrt_power). When somebody plug the car power runs above 10 watts and I receive notification and fix input_number.charging_start_value. I make subtract sensor to calculate consumed electricity
   value_template: "{{ '%0.2f' | format (states('sensor.charger_month_consumption') | float - states('input_number.charging_start_value') | float) }}".
   Problem is that some cars when charging near to finish but not complete, power runs less than 10 watts for seconds and my automation triggers again, and consumption value resets.
2. For trigger I cannot use buttons, for example Zigbee, to start and stop charging, no Zigbee network.

I would be very grateful if you help me find a solution.

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