C/C++ Socket UDP Client Data Sending -> Keep sending only one peer - udp

Question

i faced a problem with Multi-UDP Socket.
Now I have a PC(192.168.58.200), and 3 MPU(STM32F4)(192.168.85.100~102).
and I Conncected RS232 With MPU.
When MPU got a messasge, it returns just 'X', and print out same thing with RS232, so i can distinguish when PC can not send message and when MPU can get a message but PC can not recieve the message.
below is my code, Especially "UdpClient[c].Write( TempStr, strlen(TempStr));" doesnt work.
when it send mesage, only one MPU can get a message, and keep reciving 30~40 sec, some times changed other MPU.
1:1 is fine, but problem is more 2 Peer. please share your experiences.
// udpclient.cpp
#include <stdio.h>
#include "UDPCLIENT.h"
#include "UDPServer.h"
struct sPeer
{
char IP[64];
int Port;
};
#define CUR_MPU 3
#define MAX_MPU 16
sPeer Peer[MAX_MPU];
unsigned long _stdcall ReadThread(void *Param)
{
UDPSERVERSOCKET UDPSocket;
int ID = (int)Param;
printf("Server ID %d\n", ID);
UDPSocket.Open(Peer[ID].Port);
while (1)
{
char ReadBuffer[1024];
char Addr[32];
UDPSocket.Read(Addr, ReadBuffer, 1024);
printf("%s>%s\n", Addr, ReadBuffer);
}
UDPSocket.Close();
return 0;
}
int main()
{
sprintf(Peer[0].IP, "192.168.58.100"); Peer[0].Port = 7726;
sprintf(Peer[1].IP, "192.168.58.101"); Peer[1].Port = 7727;
sprintf(Peer[2].IP, "192.168.58.102"); Peer[2].Port = 7728;
///////////////////////쓰레드를 연다./////////////////
for (int c = 0; c < CUR_MPU; c++)
{
DWORD ID;
HANDLE thread01 = CreateThread( NULL,//보안 속성
0,//스택의 크기
ReadThread,//함수
(void *)c,//인자
0,//생성플러그
&ID);// 아이디
}
UDPCLIENTSOCKET UdpClient[CUR_MPU];
for (int c = 0; c < CUR_MPU; c++)
{
UdpClient[c].Open(Peer[c].IP, Peer[c].Port);
}
while (1)
{
char TempStr[1024];
printf("보낼 메시지 ---");
scanf("%s", TempStr);
for (int c = 0; c < CUR_MPU; c++)
{
UdpClient[c].Write( TempStr, strlen(TempStr));
}
}
for (int c = 0; c < CUR_MPU; c++)
UdpClient[c].Close();
return 0;
}
Cleint.cpp
#include "UDPCLIENT.h"
int UDPCLIENTSOCKET::Open(char *Address , int Port)
{
unsigned int addr;
int nRtn = WSAStartup(MAKEWORD(1, 1), &wsaData);
if (nRtn != 0) {
perror("WSAStartup 오류\n");
return -1;
}
s = socket(AF_INET, SOCK_DGRAM, 0);
if (s < 0) {
perror("소켓 오류\n");
WSACleanup();
return -2;
}
lpHostEnt = gethostbyname(Address);
if (lpHostEnt == NULL) {
addr = inet_addr(Address);
lpHostEnt = gethostbyaddr((char *)&addr, 4, AF_INET);
if (lpHostEnt == NULL) {
perror("서버를 찾을 수 없습니다.\n");
_getch();
return -3;
}
}
memset(&addrin, 0, sizeof(addrin));
memcpy(&(addrin.sin_addr),
lpHostEnt->h_addr_list[0],
lpHostEnt->h_length);
addrin.sin_port = htons(Port);
addrin.sin_family = AF_INET;
//addrin.sin_addr.s_addr =
// *((unsigned long *)lpHostEnt->h_addr);
return 1;
}
void UDPCLIENTSOCKET::Close()
{
closesocket(s);
WSACleanup();
}
int UDPCLIENTSOCKET::Write(char *Address, int Port, char *Buffer, int Size)
{
unsigned int addr;
lpHostEnt = gethostbyname(Address);
if (lpHostEnt == NULL) {
addr = inet_addr(Address);
lpHostEnt = gethostbyaddr((char *)&addr, 4, AF_INET);
if (lpHostEnt == NULL) {
perror("서버를 찾을 수 없습니다.\n");
_getch();
return -3;
}
}
memset(&addrin, 0, sizeof(addrin));
memcpy(&(addrin.sin_addr),
lpHostEnt->h_addr_list[0],
lpHostEnt->h_length);
addrin.sin_port = htons(Port);
addrin.sin_family = AF_INET;
int nRtn = sendto(s, Buffer, Size, 0,
(LPSOCKADDR)&addrin, sizeof(addrin));
return nRtn;
}
int UDPCLIENTSOCKET::Write(char *Buffer, int Size)
{
int nRtn = sendto(s, Buffer, Size, 0,
(LPSOCKADDR)&addrin, sizeof(addrin));
return nRtn;
}
Server.cpp
#include "UDPServer.h"
int UDPSERVERSOCKET::Open(u_short uport)
{
int nRtn;
if (WSAStartup(MAKEWORD(1, 1), &wsaData) != 0) {
perror("WSAStartup Error\n");
return -1;
}
s = socket(AF_INET, SOCK_DGRAM, 0);
if (s < 0) {
perror("socket 오류\n");
WSACleanup();
return -2;
}
memset(&addrin, 0, sizeof(addrin));
addrin.sin_port = htons(uport);
addrin.sin_family = AF_INET;
addrin.sin_addr.s_addr = htonl(INADDR_ANY);
nRtn = bind(s, (LPSOCKADDR)&addrin, (int)sizeof(addrin));
if (nRtn == SOCKET_ERROR) {
perror("bind 오류\n");
closesocket(s);
WSACleanup();
return -3;
}
return 1;
}
int UDPSERVERSOCKET::Read(char *Addr, char *Buffer, int Length)
{
int fromlen = (int)sizeof(from);
int nRtn = recvfrom(s,
Buffer,
Length -1,
0,
(SOCKADDR *)&from,
&fromlen);
if (nRtn == SOCKET_ERROR)
{
Addr[0] = 0;
perror("recvform 오류\n");
closesocket(s);
WSACleanup();
return -4;
}
strcpy(Addr, inet_ntoa(from.sin_addr));
Buffer[nRtn] = '\0';
return 1;
}
int UDPSERVERSOCKET::Close()
{
closesocket(s);
WSACleanup();
printf("WSACleanup 완료\n");
return 1;
}
void UDPSERVERSOCKET::ShowErrorMessage(int i)
{
}
void UDPSERVERSOCKET::ReturnClientIP(char *Buffer)
{
}