Home Assistant Configuration: pulse_counter in configuration.yaml

Hello,

I need a configuration for the current version of home assistant.
There is nothing to developer implement, it’s just putting the right configuration there.

I have a pulse coming from a power meter.
100 Pulses equal 1 KWh
ESPHome is perfectly reading the signal via platform pulse_counter:
https://esphome.io/components/sensor/pulse_counter.html

As the area doesn’t have stable internet I’d modify an ESP or similar to send a String or Char whenever the pulse occurs.

The ESP connects to the home-assistant-server via USB.
Adding the following to configuration.yaml

sensor:
- platform: serial
serial_port: /dev/ttyUSB0
baudrate: 9600

provides the transmitted text.

Write a customization that will:
- count the pulses and provide the current power consumption to Home-Assistant
- summarize the pulses and provide the KWh to be shown in the Home-Assistant-Power-metering

Offer a realistic price, I'll award and release once the configuration is successfully tested on my setup.