Doesn´t work with NANOESP32

[dzech]

I want to use your library with the SDI-Adapter from IRROMETER (https://www.irrometer.com/pdf/426.pdf)
The simple code works with the MEGA 2560 but not with the NANOESP32 although the specifications say all ESPs should work.
On the NANOESP32 I use D7 as data pin.

#include <SDI12.h>
#define DATA_PIN 12
SDI12 mySensor(DATA_PIN);

void setup() {
Serial.begin(9600);
mySensor.begin();
delay(1000);
}

void loop() {

mySensor.sendCommand("0I!");
delay(320);

String response = "";
while (mySensor.available()) {
char c = mySensor.read();
response += c;
delay(50);
}
Serial.print("Wert: ");
Serial.println(response);

delay(3000); //milliseconds
}