All Questions
149
questions
-3
votes
1
answer
116
views
How to interface with a UNIX port? [closed]
I have encountered this same question in numerous forms over the past year, and have not been able to find the solution I am after. As the question has yet again reared its head, I am asking here with ...
1
vote
0
answers
70
views
How to manage responses from multiple measuring devices to a single TCP/IP port for time sensitive applications?
I am very new to Socket programming, and I would appreciate any input you have in my question.
I am a physicist working on a project where the time intervals and coincidence of measurements play a big ...
- 45
-1
votes
1
answer
76
views
Winsock client not connecting to any server
I made two separate C programs using Visual Studio 2022, A client application and a server application, but my client app cannot connect to any external servers, including google.com. My server works ...
2
votes
1
answer
295
views
Override open function using LD_PRELOAD
I already made a library that i override the readdir function and I use it to cover up some processes, and now am trying to override the open function, in order to hide a port that is opened, this is ...
-1
votes
1
answer
85
views
how to specify ports number for both sides of a tcp connection (client and server side) in c using sockets
I am trying to replicate this diagram in C:
I have created the request line connection fine, but I can't find any information that has worked on how to create a connection where both sides have ...
- 9
0
votes
2
answers
166
views
How to detect If a digital pin is blinking (from high to low) in C?
I am writing a firmware application. I must read a GPIO pin connected to a smart battery, which communicates the state of the battery. A high value in the pin means the battery is in an unknow state, ...
- 89
1
vote
1
answer
71
views
c-code does not correctly poll/interrogate an instrument connected through serial port
I am writing a c program to log data that arrives via serial port from an instrument. The instrument is interrogated using various ascii characters terminated in a single carriage return.
The ...
- 33
0
votes
1
answer
412
views
Unable to see the data sent from STM32 over virtual COM port to PC
I am trying to learn STM32 programming and trying to send a sample text from the microcontroller to the PC. Here is the code :
#include "main.h"
\#include "usb_device.h"
/\* ...
- 65
0
votes
2
answers
568
views
Assemble a struct from Bytes received through serial port in C#
In C I simply do a memcpy from my data buffer array to the address of my struct.
I am not sure how to do this in C# for the desktop side of things. This is my struct in C#
struct frame_type
{
...
- 151
-2
votes
1
answer
1k
views
Socket programming chat application
I made a chat application using sockets in c language. When i run server and client on same device it works fine. But, when i run client and server on different device client shows connect error. is ...
- 1
2
votes
1
answer
769
views
Define Source port of tcp socket SOCK_STREAM
i want to define the sourceport(localport) of this socket connection -- some help plox xD
if ((fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) == -1)
{
continue;
}
// Set it in ...
0
votes
0
answers
153
views
Send a message to a webserver using only the client ephemeral port
I'd like to send a message to a server without actually sending any data.
For example, specifying a client ephemeral port 7273 (is HI in ASCII)
Successively connecting using ports 7279, 8732, 6582, ...
- 2,125
0
votes
1
answer
1k
views
receiving udp packets from a specific client
I am trying to implement UDP Server with "accept" function like the one in TCP. That because I need to keep one channel for each client. My question is how to let the UDP socket receiving ...
- 13
0
votes
2
answers
126
views
a random port is chosen while initing socket [closed]
int create_socket(struct in_addr *ip, unsigned int port) {
int s = socket(AF_INET, SOCK_STREAM, 0);
struct sockaddr_in sin;
memset(&sin, 0, sizeof(sin));
sin.sin_family = AF_INET;
...
- 113
0
votes
0
answers
123
views
How to assign incoming packet's source port to outgoing packet destination port -- TCP C Linux
I like to know the source port of packet in tcphdr can be assigned to destination port of ip like this
source_ip_tcph->source= dest_ip_tcph->dest;
source_ip_tcph->dest = ...
- 4,254