1,634 questions
Advice
1
vote
4
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84
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Which paradigm and tech stack for an app that listens to messages and updates shapes on a satellite map
I am taking advantage of StackOverflow's new "General advice" question type to present my use case and ask for technical guidance.
I am a Data Scientist with several years experience in ...
2
votes
1
answer
101
views
Asynchronous listening and processing in a Pyside app
I am having difficulties integrating asyncio with Pyside.
What I want to acheive:
I have several emitters (up to 30) sending messages independently every few milliseconds (200ms) in multicast.
I have ...
1
vote
1
answer
126
views
UDP multicast stream suddenly stops for 1-30 secs and automatically starts again
I am trying to receive an UDP multicast data stream with an UdpClient (C# on .NET 8). The messages are binary encoded messages, size approx. 90 bytes each, approx. 50-60 messages per second.
Receiving ...
0
votes
0
answers
61
views
gstreamer does not allow my application to make multicast endpoint
I have this gstremer pipeline which is started by Qprocess in Qt Application:
gst-launch-1.0 rtspsrc location="rtsp://admin:[email protected]:554/sub" ! rtph264depay ! h264parse ! mpegtsmux ...
4
votes
2
answers
150
views
How to choose the correct port for multicast in linux / C
I have tried to do a multicast on a local network in C. My main problem is that:-
When I am trying to execute multiple instance listening to the broadcaster, only one client receives the message and ...
1
vote
1
answer
86
views
How to know which device interfaces will actually work for IPv6 multicast?
I am converting my IPv4 networking library to support IPv6. I am using it to initiate UDP communication between devices on the same LAN. One of the devices broadcasts (IPv4) a "connect" ...
-1
votes
1
answer
115
views
How to receive VRRP multicast packets on port 112?
I'm trying an experiment with keepalived and the VRRP protocol. I have keepalived running on computer A, and from computer B I want to read the multicast VRRP messages to find the the Virtual IP ...
1
vote
0
answers
121
views
Boost.ASIO: not getting multicast udp input
I am trying to receive UDP multicast messages on Linux.
With tcpdump I see packets coming in at the expected rate:
22:04:30.224631 IP <myhostname>.55292 > 239.255.0.1.sdt: UDP, length 638
...
2
votes
1
answer
80
views
Can I bind ip and port to receive mulitcast traffic from a specific network interface
On Linux, I want to receive multicast traffic only from a specific interface. So I bind the interface and port to socket, then join the multicast group by setsockopt with IP_ADD_MEMBERSHIP option. ...
0
votes
0
answers
60
views
Missing Messages with PGM in PUB/SUB Architecture Using ZMQ 4.3.6
I'm working on a PUB/SUB architecture with the following setup:
Receiver:
Platform: x86 Ubuntu 24.04
Sender:
armv7 embedded device with ubuntu based custom OS
On both:
ZeroMQ Version: 4.3.6 (libzmq)
...
3
votes
0
answers
148
views
Firebase Multicast Message Integration Connection Max pool warning
I am encountering an issue with Firebase where I see the following error message in the logs:
Firebase Connection pool is full, discarding connection: oauth2.googleapis.com. Connection pool size: 10
...
5
votes
1
answer
568
views
Multicast works on WSL1, but not WSL2
I have a small app that is running two threads.
One thread sends a UDP multicast packet (to group 239.0.0.1), and the other reads that same multicast packet.
When I run this on app on Windows using ...
0
votes
1
answer
144
views
What is the purpose of the 25th bit of a multicast mac address
I have a video stream sent from an FPGA.
When I analyse this multicast stream with Wireshark, I see the destination mac address : 01:00:5E:A9:A9:0A. The FPGA is configured to send to this multicast IP ...
1
vote
1
answer
95
views
How to distinguish the incoming packets group when joining multiple multicast feeds in UdpSocket
I need to listen 2 UDP multicast addresses. One is 233.113.216.75:21001 and the other is 233.113.216.70:21001. Due to their ports are same I can't bind to them separately.
use std::net::UdpSocket;
...
-1
votes
1
answer
85
views
multicast from loopback device to nic
am trying to test UDP mutlicast in same host.since i have only 1 NIC card,my idea is send multicast data to loopback device and consume at NIC
googling how to send multicast data to loopback device ,i ...
1
vote
0
answers
126
views
UDP Multicast C#
I have an application running in Linux (VirtualBox) what is sending messages with UDP multicast. I want to receive these messages within a C# application that's running on Windows. With Wireshark I ...
0
votes
1
answer
111
views
send multicast but only local can read
I have 2 different machine example is 192.168.11.115 and 192.168.11.114
Machine 192.168.11.114 will send video stream to multicast address 239.0.0.1 and port 1234
And I want machine 192.168.11.115 can'...
0
votes
0
answers
127
views
Why does the UDP multicast receiver need to bind to the port which the sender sendto?
I created a multicast sender and receiver, where the sender sends messages to 239.255.0.1:54321. It works well.
The receiver's steps are as follows:
Create a socket
Bind to 239.255.0.1:54321
Join the ...
0
votes
1
answer
54
views
Send data to all sockets at exact time [closed]
Say we have array or list of sockets named (A,B,C) and we want to send data to all of them at the same exact time due to that the application is really time critical, then is there a away to send to ...
0
votes
1
answer
119
views
Multicast UDP local transfer failed using Flute protocol in Rust
I'm trying to run the flute in rust demo code in my local.
I modified demo code from read me to below
use flute::sender::Sender;
use flute::sender::ObjectDesc;
use flute::sender::Cenc;
use flute::core:...
0
votes
0
answers
102
views
Issues Receiving Multicast UDP Data with Mellanox Network Card in C++ on Windows
I am working on a C++ application to receive multicast UDP data on a Windows machine. I have encountered an issue where the application is missing data packets when using a Mellanox network card. ...
-2
votes
1
answer
162
views
Confused about Linux multicast
I am struggling with two executables that I have built, which should communicate over multicast. In my current setup they should communicate over the loopback device.
For this I have executed two ...
1
vote
1
answer
93
views
How can I translate this TCP/IP MULTICAST code from Python to Go
I have this code, written in Python. From what I understand it
Creates a single socket
Adds every local IP address as a member of the given multicast groups.
If any local interface receives a ...
0
votes
0
answers
60
views
Implementing multicast in Java, but sometimes other hosts fail to receive multicast messages
I'm implementing multicast with Java, but I've encountered some issues. When I start with [Host A receiver -> Host B receiver -> Host A sender], Host B cannot receive the multicast messages. ...
0
votes
1
answer
600
views
Why does Windows Filtering Platform apply ALE reauthorization for EVERY single incoming multicast UDP packet from same source?
I am using iperf network testing tool and observe the following: if, on box A (Windows Server 2019), I have a single sender that posts to some multicast address/port, and 5 multicast receivers, ...
0
votes
2
answers
168
views
Question to multicast concept with BSD Socket APIs
I'm relatively new to topics such as socket programming and multicast messages. I'm trying to understand this concept better.
Let's say a PC is sending Multicast messages over address 224.0.0.0 on ...
2
votes
1
answer
64
views
Understand the received packet length from a multicast group address
https://github.com/dashersw/docker-cloud-multicast/blob/master/mcreceive.c
$ ./mcreceive X.X.X.X 60001
where X.X.X.X is a multicast address
Received 28 bytes from X.X.X.X: Ϭ(
Received 28 bytes from ...
0
votes
1
answer
57
views
c++ zeromq with pgm crash in joining multicast in windows
I compile zeromq c++ source code with pgm source code in visual code 2019, and get zeromq lib.
Then I config my multicast environment, but the program failed in joining multicast.
my code is :
...
1
vote
0
answers
87
views
How can I clear the internal buffer of ZMQ multicast without closing the socket?
I'm using ZeroMQ (ZMQ) to transfer bulk data from a server to multiple groups. The bulk data is divided into small chunks and transmitted accordingly. After sending a predefined window of data, I ...
0
votes
1
answer
417
views
Change default udp multicast ttl at linux
Is there any method to change udp multicast ttl at linux system level ?
I already know use setsockopt to set IP_MULTICAST_TTL in application. But i want to change ttl in system level.
1
vote
0
answers
43
views
Running grid db in multicast mode
I have installled griddb on WSL which by default runs in FIXED mode. The configuration file gs_cluster.json is as below :
{
"dataStore":{
"partitionNum":128,
"...
1
vote
1
answer
205
views
Multiple Netty clients listening on the same multicast group
I am trying to get multiple Netty clients listening on the same multicast group address.
The issue with running these clients on the same machine is that each client is bound to the same port (group ...
0
votes
0
answers
31
views
udpclient auto find server. client/broadcaster doesn't receive message
I am trying to auto find server app within a local network using usbclient in the following code.
the sever and broadcaster is run on separate pc.
The server always receives the broadcaster message, ...
1
vote
2
answers
225
views
Python socket transmitting on correct interface but with wrong source address
I have a multicast system with multiple network interfaces. Packets transmitted using the socket I created are being sent out the correct interface, but the packet's source address is incorrect. The ...
0
votes
1
answer
156
views
Humminbird echosounder multicast stream data to listen c#
Good day firends
I am trying to write app for my echosounder humminbird helix 9 to live receive data from it.
I have connected it by router and using wire shark i found that it streams data ...
0
votes
1
answer
1k
views
No IGMP report packets on multicast stream
I'm trying to capture an multicast stream with ffmpeg behind a switch with IGMP Snooping enabled:
root [ /tmpfs/root ] $ ffmpeg -i rtp://239.0.0.1:5006 /tmp/stream.mp4
The stream always disconnects ...
0
votes
0
answers
54
views
How to create socket to send and receive UDP packets
How may I create a socket that can both send and receive UDP packets?
My application requires that sockets are bound to the physical network interface because it's a multicast system with multiple ...
0
votes
0
answers
132
views
socket recvfrom() hanging/blocking when trying to capture UDP or multicast data in python
First, I want to show that my interface w/static IP 10.10.10.88 is receiving the data, so I don't see how this can be a firewall issue:
Packets in Wireshark
Wireshark is not running when I run the ...
0
votes
1
answer
1k
views
How to serve RTSP multicast server with gstreamer and OpenCV?
I wanna write a program that streams cv2 frames through a multicast or broadcast rtsp/rtp server.
I've written a code below with some examples, but with this code I only can stream using just first ...
-2
votes
1
answer
219
views
Multicast-Message within VLAN using IPv6 has no 802.1Q-field (VLAN) within Ethernet frame
I want to know how multicast works in VLAN for the IPv6 address domain. Can anybody tell me, whether the VLAN ID - by specification - is added to an Ethernet frame, when I send data to an IPv6 ...
0
votes
1
answer
432
views
Mdns packets not received by avahi
I'm porting mdns into my embedded device(in C), it's not using socket but some raw packet tx.
And want to test it with avahi, so I run a virtualbox ubuntu, and build avahi so I can add debug message.
...
0
votes
0
answers
403
views
Python Multicast Receiver Not Receiving Data, But Wireshark Does. Code issue, or system issue?
I'm trying to receive multicast UDP packets in Python. The packets are visible in Wireshark but are not being received by my Python program. The multicast group is 224.0.2.2, and the port is 42102. ...
0
votes
0
answers
95
views
Can I constrain UDP communication to LAN only?
I have multiple apps setup to work in a LAN over Wi-Fi. In order to handshake (establish communication) automatically I'm using UdpClient to broadcast the server address. The server is running on ...
0
votes
1
answer
419
views
How does a gateway forward UDP multicast packets?
I implemented test programs to send/receive UDP packets through multicast using 224.x.x.x IP address. The server and the client are in the same 192.x.x.x/24 subnet and the server receives UDP packets ...
1
vote
1
answer
3k
views
How to avoid multicast timeout due to IGMP snooping
I have an embedded device (ESP32) that uses an UDP socket with multicast. It is connected to a router through another wifi device that acts as an access point.
After some time (260 seconds), the ...
0
votes
0
answers
1k
views
Allowing Local Multicast mDNS Access Through Linux Wireguard VPN
I have a Raspberry Pi 4 ("Buster") on which I am deploying a VPN. I am using the Linux Wireguard library installed through:
sudo apt install wireguard.
Here is an example XXXXXX.conf file I ...
0
votes
1
answer
866
views
vsomeip - how to discover service in QEMU-QNX guest from Ubuntu host?
I am running vsomeip service example from the Wiki page "https://github.com/COVESA/vsomeip/wiki/vsomeip-in-10-minutes#devices" inside virtual QNX guest on QEMU. Bridge networking is enabled ...
0
votes
1
answer
142
views
How can I one-to-many stream with netcat or socat?
I have a serial device I would like to share with other devices on my network. I would like each device to be able to read/write to this serial device.
I have used netcat to stream this serial device ...
2
votes
1
answer
532
views
When subscribing to a multicast group, what is the best way to filter traffic from other hosts in the group?
There is a server that will be sending messages to a multicast group.
I have multiple clients that will be receiving messages from that multicast group.
It's my understanding that anyone can send ...
1
vote
1
answer
67
views
UDP Multicast data not being received by clients
Here's my code... I've tried many things, but none of them work. I'm sure there's something I'm missing. The intent is that a client listens to the given _remoteEndpoint address. Instead, nothing is ...