udp

Getting incoming TTL in GO

由 谁说我不能喝 提交于 2021-02-19 05:34:22
问题 I'm struggling with a small project I am working on. I want to implement functionality in GO that allows me to set the IP header TTL on an outgoing UDP packet that I then send and view the received TTL on the other end. I have a tried using a number of connections provided by the 'net' library and have so far had no success (I can set the TTL but I can't read it). Can anyone suggest a way of sending and receiving UDP packets that provide access to the packet's TTL field? 回答1: Set TTL: var

How to listen to different UDP ports on the same address within the same process in Node.js

由 泄露秘密 提交于 2021-02-19 05:27:16
问题 I'm writing a Node.js app to control a small drone. Here are the instructions from the SDK: Use Wi-Fi to establish a connection between the Tello and PC, Mac, or mobile device. Send Command & Receive Response Tello IP: 192.168.10.1 UDP PORT: 8889 <<-->> PC/Mac/Mobile Step 1: Set up a UDP client on the PC, Mac, or mobile device to send and receive message from the Tello via the same port. Step 2: Before sending any other commands, send 'command' to the Tello via UDP PORT 8889 to initiate SDK

How to listen to different UDP ports on the same address within the same process in Node.js

由 谁说我不能喝 提交于 2021-02-19 05:26:07
问题 I'm writing a Node.js app to control a small drone. Here are the instructions from the SDK: Use Wi-Fi to establish a connection between the Tello and PC, Mac, or mobile device. Send Command & Receive Response Tello IP: 192.168.10.1 UDP PORT: 8889 <<-->> PC/Mac/Mobile Step 1: Set up a UDP client on the PC, Mac, or mobile device to send and receive message from the Tello via the same port. Step 2: Before sending any other commands, send 'command' to the Tello via UDP PORT 8889 to initiate SDK

UDP packets not displayed in Wireshark

由 故事扮演 提交于 2021-02-19 05:04:56
问题 I have an embedded jetty server(server1) which sends UDP packets as trigger to receive a message from another server(server2). server1 then waits for a message from server2. This message is then validated and processed further. From testing the server1, I saw that some times server2 doesnot send messages on receiving a trigger from server1. So I tried analyzing it with Wireshark. When I gave the capture filter as UDP, it is not showing any packets even though at the server1 I received some

四十二,Java 网络编程浅析

由 时光怂恿深爱的人放手 提交于 2021-02-19 04:59:12
1. 网络编程的基本概念 网络编程使物理上不在一起的主机进行互联 , 网络连接过程需要使用网络协议 , 常见的通信协议是 TCP,UDP 协议 . TCP: 属于可靠的连接 , 使用三方握手的方式完成连接的确认 . UDP: 属于不可靠的连接 . 对于网络的开发有两种架构 :C/S 和 B/S. 2. 简单 TCP 程序实现 网络开发包所在的类都在 java.net 开发包中 . 此包中可以使用 ServerSocket,Socket 类完成服务器和客户端的开发 . 开发 TCP 程序 , 首先开发服务器端 , 使用 ServerSocket 进行客户端的连接接收 , 每个客户端在程序上都使用 Socket 对象表示 . Server 代码 : package com.ares.demo.helloserver; import java.io.OutputStream; import java.io.PrintStream; import java.net.ServerSocket; import java.net.Socket; public class HelloServer { public static void main(String[] args) throws Exception { ServerSocket server = new ServerSocket

Disconnect UDP socket in python?

由 試著忘記壹切 提交于 2021-02-18 18:13:38
问题 I need to 'disconnect' a UDP socket in python(and not close it!). Is it possible to do the equivalent of: int disconnect_udp_sock(int fd) { struct sockaddr_in sin; memset((char *)&sin, 0, sizeof(sin)); sin.sin_family = AF_UNSPEC; return (connect(fd, (struct sockaddr *)&sin, sizeof(sin))); } taken from here in python without interfacing the function? 回答1: Looking at socketmodule.c in the Python 2.7 sources, it doesn't seem possible. You really need to define and call the C function above. 来源：

Disconnect UDP socket in python?

由 为君一笑 提交于 2021-02-18 18:09:04
问题 I need to 'disconnect' a UDP socket in python(and not close it!). Is it possible to do the equivalent of: int disconnect_udp_sock(int fd) { struct sockaddr_in sin; memset((char *)&sin, 0, sizeof(sin)); sin.sin_family = AF_UNSPEC; return (connect(fd, (struct sockaddr *)&sin, sizeof(sin))); } taken from here in python without interfacing the function? 回答1: Looking at socketmodule.c in the Python 2.7 sources, it doesn't seem possible. You really need to define and call the C function above. 来源：

Datagram Transport Layer Security (DTLS) on Android/Java

由 醉酒当歌 提交于 2021-02-18 02:06:10
问题 Has anyone used DTLS on Android or is there an open source Java implementation that supports DTLS? What are my other options for securing UDP traffic on Android? 回答1: DTLS support is not available in pure Java yet. We ended up using OpenSSL through JNI. I doubt you will find anything on Android. You should use TLS (which means you have to use TCP). 回答2: wolfSSL recently created an open source JNI wrapper around the lightweight SSL/TLS library, CyaSSL. The wrapper supports both DTLS 1.0 and

Datagram Transport Layer Security (DTLS) on Android/Java

由 只谈情不闲聊 提交于 2021-02-18 02:03:08
问题 Has anyone used DTLS on Android or is there an open source Java implementation that supports DTLS? What are my other options for securing UDP traffic on Android? 回答1: DTLS support is not available in pure Java yet. We ended up using OpenSSL through JNI. I doubt you will find anything on Android. You should use TLS (which means you have to use TCP). 回答2: wolfSSL recently created an open source JNI wrapper around the lightweight SSL/TLS library, CyaSSL. The wrapper supports both DTLS 1.0 and

Datagram Transport Layer Security (DTLS) on Android/Java

由 我的梦境 提交于 2021-02-18 02:01:34
问题 Has anyone used DTLS on Android or is there an open source Java implementation that supports DTLS? What are my other options for securing UDP traffic on Android? 回答1: DTLS support is not available in pure Java yet. We ended up using OpenSSL through JNI. I doubt you will find anything on Android. You should use TLS (which means you have to use TCP). 回答2: wolfSSL recently created an open source JNI wrapper around the lightweight SSL/TLS library, CyaSSL. The wrapper supports both DTLS 1.0 and
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