mylib

#define READPORTS 2
#define PORTSOUT 3

uint8_t readports[READPORTS] = {22,21};
uint8_t ports_out[PORTSOUT] = {17,15,18};

MyLib mylib(Serial, localAddress, destinationAddress);

void setup() {

  Serial.begin(9600);
  mylib.initialize(ports_out, readports, PORTSOUT, READPORTS, 'R');
....