class Slay2
{
   ...
   virtual unsigned int getTime1ms(void) = 0;
   virtual unsigned int getTxCount(void) = 0;
   virtual int transmit(const unsigned char * data, unsigned int len) = 0;
   virtual int receive(unsigned char * buffer, unsigned int size) = 0;

   Slay2Channel * open(const unsigned int channel);
   void close(Slay2Channel * const channel);

class Slay2Channel
{
   ...
   int send(const unsigned char * data, const unsigned int len, const bool more=false);
   void setReceiver(const Slay2Receiver receiver, void * const obj=NULL);

//main.cpp
#include "slay2.h"
#include "slay2_linux.h"            //Slay2Linux is a target adaption of slay2 for Linux

...

static Slay2Linux slay2;            //Slay2Linux is a child of Slay2 (e.g. Slay2Linux : public Slay2 ...)
static Slay2Channel * slay2ch[3];   //3 logical slay2 communication channels

...

static void onSerialReceive(void * const obj, const unsigned char * const data, const unsigned int len)
{
   Slay2Channel * thiz = (Slay2Channel *)obj; //e.g. you can use "obj" to reference an object instance
   ...
}

static void anotherOSerialReceive(void * const obj, const unsigned char * const data, const unsigned int len)
{
   ...
}

...

int main(int argc, char * argv[])
{
   //optional - if the target adaption requires an initialization....
   slay2.init("/dev/ttyUSB0", 115200);      //this is a Slay2Linux specific method to initialize the tty device

   //open the communication channel 0, and set receive callback (used by channel 0 and 1, with parameter)
   slay2ch[0] = slay2.open(0);
   slay2ch[0]->setReceiver(&onSerialReceive, (void *)slay2ch[0]);

   //open the communication channel 1, and set receive callback (used by channel 0 and 1, with parameter)
   slay2ch[1] = slay2.open(1);
   slay2ch[1]->setReceiver(&onSerialReceive, (void *)slay2ch[1]);

   //open the communication channel 2, and set its own receive callback
   slay2ch[2] = slay2.open(2);
   slay2ch[2]->setReceiver(&anotherOnSerialReceive); //obj will be NULL, because of default parameter


   //enter application loop
   while (true)
   {
      /*
         application logic to send data using
          slay2[...]->send(x, y);
         and receive data using
          the respective callback function
      */

      //process communication
      slay2.task(); //this method must be called cyclically
   }

   ...