Itmr() (Retentive Timer) accumulates the time the condition is ON and clears it with the Reset input.

bool Itmr(uint8_t timer_id, bool state, unsigned long delayTime, bool reset = false)

bool Iton(uint8_t timer_id, bool state, unsigned long delayTime);
bool Itof(uint8_t timer_id, bool state, unsigned long delayTime);
bool Itpl(uint8_t timer_id, bool state, unsigned long delayTime);
bool Itmon(uint8_t timer_id, bool state, unsigned long delayTime);
bool Itmr(uint8_t timer_id, bool state, unsigned long delayTime, bool reset = false);
unsigned long IgetTime(uint8_t timer_id);
bool IgetState(uint8_t timer_id);

• Timer interrupt callbacks run inside an ISR. For safety, change only flags in the callback and perform actual control processing in loop().
• Do not use slow or interrupt-dependent code such as delay(), Serial, I2C or SPI in callbacks.
• Normally, call ImodbusRTU() repeatedly in loop(). Call it from a timer interrupt with a sufficient interval only when long delay() calls or debug output slow down loop().
• Do not use the default ItimerSet() together with tone() using Timer2 or analogWrite() on Timer2 PWM pins.
• Explicitly using Timer1, Timer3, Timer4 or Timer5 may conflict with PWM, analog output or high-speed counter functions using that timer.
• Configure only one Itimer callback per hardware timer.
• Defining an ISR for the same timer directly in the sketch may conflict with Itimer operation.
• ItimerStopAll() stops only hardware interrupt timers. It does not reset PLC-style timer states such as Iton, Itof or Itmr.

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