앱인벤터와 C서버간 소켓 통신문제..

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <errno.h>
#include "string.h"
#include "time.h"
#include "sys/types.h"
#include "sys/socket.h"
#include "netinet/in.h"
//소켓 프로그래밍에 사용될 헤더파일 선언
#define BUF_LEN 128
//메시지 송수신에 사용될 버퍼 크기를 선언
 
 
int main(int argc, char *argv[])
{
	char buffer[BUF_LEN];
	struct sockaddr_in server_addr, client_addr;
	char temp[20];
	int server_fd, client_fd;
    //server_fd, client_fd : 각 소켓 번호
    	int len, msg_size;
 
 
    	if(argc != 2)
    	{
        	printf("usage : %s [port]\n", argv[0]);
        	exit(0);
    	}
 
    	if((server_fd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
    {// 소켓 생성
       	printf("Server : Can't open stream socket\n");
       	exit(0);
    	}
    	memset(&server_addr, 0x00, sizeof(server_addr));
 
   //server_Addr 을 NULL로 초기화
 
    	server_addr.sin_family = AF_INET;
    	server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
    	server_addr.sin_port = htons(atoi(argv[1]));
    //server_addr 셋팅
 
    	if(bind(server_fd, (struct sockaddr *)&server_addr, sizeof(server_addr)) <0)
    	{//bind() 호출
       	printf("Server : Can't bind local address.\n");
       	exit(0);
    	}
 
    	if(listen(server_fd, 5) < 0)
    {//소켓을 수동 대기모드로 설정
       	printf("Server : Can't listening connect.\n");
       	exit(0);
    	}
 
    	memset(buffer, 0x00, sizeof(buffer));
    	printf("Server : wating connection request.\n");
    	len = sizeof(client_addr);
    	while(1)
    	{
        	client_fd = accept(server_fd, (struct sockaddr *)&client_addr, &len);
        if(client_fd < 0)
        {
            printf("Server: accept failed.\n");
            exit(0);
        }
        inet_ntop(AF_INET, &client_addr.sin_addr.s_addr, temp, sizeof(temp));
        printf("Server : %s client connected.\n", temp);
        msg_size = read(client_fd, buffer, 1024);
	printf("%s", buffer);
        write(client_fd, buffer, msg_size);
        close(client_fd);
	printf("Server : %s client closed.\n", temp);
	}
 
	close(server_fd);
 
	return 0;
 
}