Cannot receive UDP Stream from Port 2368 (Linux) C - c++

Question

I'm currently working with a Laser Sensor that delivers a UDP data stream on Port 2368. I can see the packets with Wireshark.
As I'm not able to post an image, I write what Wireshark shows for a packet:
Source: 192.168.17.141
Destination: 192.168.3.255
Protocol: UDP
Source Port: https (443)
Destination Port: opentable (2368)
However, I want to read the packets using sockets with following example C program:
int main(int argc, char *argv[])
{
int sock, n, res;
unsigned int length = 1206;
char* buffer = new char[1206];
sock= socket(AF_INET, SOCK_DGRAM, 0);
if (sock < 0) error("socket");
uint16_t udp_port = 2368;
sockaddr_in my_addr;
socklen_t len = sizeof(sockaddr_in);
memset(&my_addr, 0, sizeof(my_addr));
my_addr.sin_family = AF_INET;
my_addr.sin_port = htons(udp_port);
my_addr.sin_addr.s_addr = INADDR_ANY;
cout << my_addr.sin_family << endl;
cout << my_addr.sin_port << endl;
cout << my_addr.sin_addr.s_addr << endl;
res = bind(sock, (sockaddr *)&my_addr, sizeof(sockaddr_in));
if (res == -1)
{
perror("bind");
return -1;
}
while (true)
{
n = recvfrom(sock,buffer,1,0,NULL,NULL);
if (n < 0) error("recvfrom");
}
close(sock);
return 0;
}
The program is successful until it comes to recvfrom(). There the socket waits for packages and does not receive anything. I wrote the same program for Windows with Winsock and it worked perfectly. As I am relatively new to Linux OS I do not know how to fix this problem and would be thankful for advice!
Additional information: I manually assigned following IP and netmask to eth4 (this is the interface where the device is connected):
IP: 192.168.3.5
NM: 255.255.255.0

Answer 1

Set the SO_BROADCAST option, even for receiving. According to the socket(7) manpage:
SO_BROADCAST:
Set or get the broadcast flag. When enabled, datagram sockets receive packets sent to a broadcast address and they are allowed to send packets to a broadcast address. This option has no effect on stream-oriented sockets.
It could also be that your interface config is incorrect. Verify that you have a 192.168.3.xxx/24 address configured for the interface in question.

Answer 2

char buffer[1200+6]; /* no need for dynamic buffers */
...
n = recvfrom(sock, buffer, sizeof buffer, 0, NULL, NULL);
BTW your usage of recvfrom() is equivalent to
n = recv(sock, buffer, sizeof buffer, 0);
, or even:
n = read(sock, buffer, sizeof buffer);

Answer 3

You have
IP: 192.168.3.5 NM: 255.255.255.0
and
Source: 192.168.17.141 Destination: 192.168.3.255
This can't work, if there is no router involved. Try
IP: 192.168.3.5 NM: 255.255.0.0
as an interims measure, but do read up on IP
Edit: Maybe better look into your Laser sensor and set it to 192.168.3.[something free] with Destination directly your 192.168.3.5, and debug the broadcasting later.