readComData

int readComData(const int toReadBytes, char *serDataBuf, const int stream_status){
    unsigned int idx=0; //index of the serDataBuf
    int remainingBytes=toReadBytes, readBytes=0, totalReadBytes=0;
    fd_set rfds;    // File pointer set for select
    struct timeval serInWait;   // Time to wait for serial input
    int selRetVal;  // Return value of select

    //inits
    serInWait.tv_sec = SERIAL_TIMEOUT_SEC;
    serInWait.tv_usec = SERIAL_TIMEOUT_USEC;
    FD_ZERO(&rfds);
    FD_SET(fd, &rfds);

    //main fn
    while (remainingBytes>0){
        selRetVal = select(fd+1, &rfds, NULL, NULL, &serInWait);
        if (selRetVal==0){
            DEBUG_SERIAL(printf("SERIAL: DATA read timeout @ byte %d.\n",totalReadBytes));
            return SERIAL_TIMEOUT;
        } else if (selRetVal>0){
            readBytes=read(fd,&serDataBuf[totalReadBytes],remainingBytes);
            if (readBytes<remainingBytes){
                DEBUG_SERIAL(printf("SERIAL: last data read %d bytes. To a total of %d .\n",readBytes,totalReadBytes));
                remainingBytes-=readBytes;
                totalReadBytes+=readBytes;
            } else {
                DEBUG_SERIAL(printf("SERIAL: All remaining DATA have been read %d .\n",toReadBytes));
            }
        }// if selRetVal
    }//end while

    return 0;
}