Difficulty using the substring function

Projects Programming
26

if the library returns a String of the form "RX=7B FF 2C FF 2C FF FF 7D" you could parse it so

void setup() {
  Serial.begin(115200);
  String RX="RX=7B FF 2C FF 2C FF FF 7D";
  int d[8]={0};
  sscanf(RX.c_str(),"RX=%2x%2x%2x%2x%2x%2x%2x%2x",&d[0],&d[1],&d[2],&d[3],&d[4],&d[5],&d[6],&d[7]);
  for(int i=0;i<8;i++) {
    Serial.print(d[i],HEX);
    Serial.print(' ');
  }
}

void loop() {}

you can then pick out which elements of the array d[] you require, e.g. a run gives

7B FF 2C FF 2C FF FF 7D