TS0201 - Attiny -> https://github.com/Koenkk/zigbee2mqtt/issues/4202

ts0201.ino

#include <avr/interrupt.h>
#include <avr/sleep.h>

// Arduino IDE settings
// BOD: 1.8V
// Clock: 1.2 MHz

// ATTiny13 pins/legs
// Leg 8: VCC
// Leg 4: GND
// Leg 6: TS0201 Button

// Pin 1 for TS0201 Button
volatile int button = 1; //pin 1 (ATtiny leg 6)
volatile int count = 0;

ISR(WDT_vect) {
  count = count +1;
  //93 with 1.2 internal oscillator, about 15 min
  if(count > 93)
  {
    pinMode(button, OUTPUT);  
    digitalWrite(button, LOW);   // push button; when pushed, button is pulled down by 10k resistor in the device, so this should be safe 
    delay(100);               // wait for 100ms
    pinMode(button, INPUT);
    digitalWrite(button, LOW);
    count = 0;
  }
  //sleep_mode();
}

void setup() {
  // initialize the digital pin as an output.
  pinMode(button, INPUT);
  digitalWrite(button, LOW); //when released/default, button is pulled up by 100k resistor in the device
  
  pinMode(2, INPUT_PULLUP);
  pinMode(3, INPUT_PULLUP);
  pinMode(4, INPUT_PULLUP);
  pinMode(0, INPUT_PULLUP);
  
  // prescale timer to 8s so we can measure current
  WDTCR |= (1<<WDP3 )|(0<<WDP2 )|(0<<WDP1)|(1<<WDP0); // 8s
  // Enable watchdog timer interrupts
  WDTCR |= (1<<WDTIE);
  // Disable ADC
  ADCSRA &= ~(1<<ADEN);

  ACSR = (1<<ACD); //Disable the analog comparator
  DIDR0 = 0x3F; //Disable digital input buffers on all ADC0-ADC5 pins.  
  
  sei(); // Enable global interrupts
  
  // Use the Power Down sleep mode
  set_sleep_mode(SLEEP_MODE_PWR_DOWN);
  
  for (;;) {
    sleep_mode();   // go to sleep and wait for interrupt...
  }
  
}
// the loop routine runs over and over again forever:
void loop() {
}

Connect the ATTiny legs like this:
Leg8 - Red - VCC
Leg4- Grey - GND
Leg6 - Blue - Data/Button

Good job , thank ou , made it also on my. ( Modified only time to 5min , in reality there is ~4min 33s giving 31 value.)
I have a question regrding this
when pushed, button is pulled down by 10k resistor in the device

In TS0201 there is resistor 10k in series with button , but when ATTINY13 is conected like on the picture this resistor is not in the part of circuit...
Beetwen Pin 6 of ATTINY13 and Pin3 of P1 conector on TS0201 i put additional 10k resistor , and it still works.

sadly i'm not that familiar with the electronics of the ATTINY and this gist is mostly a saving point for the discussion in the zigbee2mqtt repo
Koenkk/zigbee2mqtt#4202 (comment)
maybe @jandy123 can give you more insights?

really appreciated your idea. it works great for me.