Sending UDP data hangs the receiving application - c++

Question

I am sending UDP packets to Hercules for testing, and whenever I send data it hangs Hecrcules.
I am not sure if it is an issue with my code.
Please have a look at my code and if it has any issues, please let me know.
void UDPConnect::Connect(unsigned short local_port, const char* local_addr)
{
WSADATA wsa;
int err;
err = WSAStartup(MAKEWORD(2, 2), &wsa);
if (err != 0)
{
//std::cout << "Failed. Error Code : " << err << std::endl;
QMessageBox Msgbox;
Msgbox.setText("Udp Connection Failed.");
Msgbox.exec();
exit(EXIT_FAILURE);
}
//Create a socket
if ((s = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) == INVALID_SOCKET)
{
// err = WSAGetLastError();
// std::cout << "Could not create socket : " << err << std::endl;
QMessageBox Msgbox;
Msgbox.setText("Could not create socket :");
Msgbox.exec();
exit(EXIT_FAILURE);
}
//Prepare the sockaddr_in structure
struct sockaddr_in server = {};
server.sin_family = AF_INET;
server.sin_port = htons(local_port);
if (local_addr)
{
server.sin_addr.s_addr = inet_addr(local_addr);
if (server.sin_addr.s_addr == INADDR_NONE)
{
// std::cout << "Invalid local address specified" << std::endl;
QMessageBox Msgbox;
Msgbox.setText("Invalid local address specified.");
Msgbox.exec();
closesocket(s);
exit(EXIT_FAILURE);
}
}
else
server.sin_addr.s_addr = INADDR_ANY;
//Bind
if (::bind(s, (struct sockaddr *)&server, sizeof(server)) == SOCKET_ERROR)
{
// err = WSAGetLastError();
// std::cout << "Bind failed with error code : " << err << std::endl;
QMessageBox Msgbox;
Msgbox.setText("Bind failed.");
Msgbox.exec();
closesocket(s);
exit(EXIT_FAILURE);
}
}
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
int UDPConnect::SendPacket(byte *buffer, unsigned int buf_size, const char* remote_addr, unsigned short remote_port)
{
struct sockaddr_in si_other = {};
int send_len;
//Prepare the sockaddr_in structure
si_other.sin_family = AF_INET;
si_other.sin_addr.s_addr = inet_addr(remote_addr);
si_other.sin_port = htons(remote_port);
if ((send_len = sendto(s, (char*)buffer, buf_size, 0, (struct sockaddr *) &si_other, sizeof(si_other))) == SOCKET_ERROR)
{
}
return send_len;
}
When I use the boost library to send data, I have no problem.
bool UDPConnect::send_udp_message(const std::string& message, const std::string& destination_ip, const unsigned short port)
{
boost::asio::io_service io_service;
boost::asio::ip::udp::socket socket(io_service);
// Create the remote endpoint using the destination ip address and
// the target port number. This is not a broadcast
auto remote = boost::asio::ip::udp::endpoint(boost::asio::ip::address::from_string(destination_ip), port);
try {
// Open the socket, socket's destructor will
// automatically close it.
socket.open(boost::asio::ip::udp::v4());
// And send the string... (synchronous / blocking)
socket.send_to(boost::asio::buffer(message), remote);
}
catch (const boost::system::system_error& ex) {
// Exception thrown!
// Examine ex.code() and ex.what() to see what went wrong!
return false;
}
return true;
}