printf ("recv_IP -> %s  \r\n", recv_IP);

#ifndef    RS232_H__
#define    RS232_H__
#include    <stdint.h>

extern unsigned char hasinput(void);
extern char getchar(void);
extern void putchar(char);
extern void puts(const char*);
extern void puts_P(const char __flash *);
static uint8_t txdone(void)    { return UCSRA & (1<<TXC); }

#ifndef    CR
#define    CR    "\r\n"
#endif

#define    putString(string) {                \
    static __flash char str[] = string;    \
    puts_P(str);                            \
}

extern int snprintf(char* buf, unsigned int size, const char* fmt, ...);
#define printf(...) do { char printf__buf[256]; snprintf(printf__buf, 256, __VA_ARGS__); putString(printf__buf); } while (0)

#endif    //RS232_H__

extern int snprintf(char* buf, unsigned int size, const char* fmt, ...);
#define printf(...) \
    do { char printf__buf[32]; \
    snprintf(printf__buf, 32, __VA_ARGS__); \
    putString(printf__buf); } \
    while (0)

int snprintf(char* buf, unsigned int size, const char* fmt, ...) {
    char* buf_start=buf, * buf_end=buf+size-1;
    const int* va=(int*)(&fmt)+1;
    char tmpbuf[32];
    while (*fmt && buf<buf_end) {
        char c=*fmt++;
        if (c=='%') {
            char* q0=tmpbuf, * q1=tmpbuf;
            int w=0;
            while (*fmt>='0' && *fmt<='9') { w=w*10+(*fmt++)-'0'; }
            c=*fmt++;
            switch (c) {
                case '%': *buf++='%'; break;
                                case 'c': *buf++=(char)(*va++); break;
                case 'd': {
                    int i=*va++, s=0;
                    q0=q1=tmpbuf+sizeof(tmpbuf);
                    if (!w) ++w;
                    if (i<0) { i=-i; s=1; }
                    while (i || w>0) { *--q0='0'+(i%10); i/=10; if (w) --w; }
                    if (s) { *--q0='-'; }
                    break;
                }
                case 'x': {
                    uint32_t x=*va++;
                    q0=q1=tmpbuf+sizeof(tmpbuf);
                    if (!w) ++w;
                    while (x || w>0) { *--q0="0123456789abcdef"[x&0x0F]; x>>=4; if (w) --w; }
                    break;
                }
                                case 's': {
                                    q0=(char*)(*va++);
                                        q1=q0;
                                        while (*q1) ++q1;
                                    break;
                                }
            }
            while (q0<q1 && buf<buf_end) *buf++=*q0++;
        }
        else *buf++=c;
    }
    *buf=0;
    return buf-buf_start;
}

static const __flash char str[] = string;

int fputc(int c, FILE* stream)
{
    if ((char)c=='\n')
    {
        if (!fputc('\r', stream))
        {
            return (0);
        }
    }

    uart_putchar(c);

    return (c);
}

char printf__buf[32];
static __flash char str[] = printf__buf;

void putString (char * string) {
    char c;
    while(c = *string++) {
        putchar (c);
    }
  }