File content as of revision 0:39c8feff805f:

#include "mbed.h"
#include "string.h"
#include "stdio.h"

DigitalOut led2(LED2);
DigitalOut led3(LED3);

Serial device(p9, p10);  // tx, rx
char msgPC[20],msgDEV[20];

void serialRXmon(){
    char msg1[] = "Your msg-> ",msg[30];
    msg[0] = '\0';
    int i=0;
     while(msgDEV[i-1]!=0x0D){
      msgDEV[i] = device.getc();
        i++;
        led3 = 1;
      }
        msgDEV[i] = '\0';
        strcat(msg,msg1);
        strcat(msg,msgDEV);
        device.puts(msg);
        led3 = 0;
        device.getc();
    }

int main() {
    int adcVal;
  device.attach(&serialRXmon);
    while(1) {
        
        adcVal = rand()%255+1;
        
        sprintf(msgPC,"adcVal -> %d\n",adcVal);
        
        if(device.writeable()) {
            device.puts(msgPC);
        }
        led2 = 1;
        wait(1);
        led2 = 0;
        wait(1);
}
    
    }