sockets – Page 5 – Tarik Billa

Create a virtual serial port connection over TCP

December 14, 2023 by Tarik

Try socat. Possible scenario: socat pty,link=/dev/virtualcom0,raw tcp:192.168.254.254:8080& socat creates TCP connection to 192.168.254.254:8080, so that everything, that will be written to /dev/virtualcom0 will be forwarded to 192.168.254.254:8080 and vice versa. Another approach would be to use RFC2217 via ser2net on Linux sever side and RFC2217 driver on Windows side (for example http://www.hw-group.com/products/hw_vsp/index_en.html single port version). … Read more

What is the best way to pass information between threads?

December 14, 2023 by Tarik

If I have a thread listening for the server how can I pass that data to the main thread for interpretation? What is the best way for the main thread to send data to the server? I’d use a BlockingQueue for this. You define a single BlockingQueue such as the LinkedBlockingQueue. Your listener class then … Read more

Setting the source IP for a UDP socket

December 13, 2023 by Tarik

Nikolai, using a separate socket and bind(2) for each address or messing with routing tables is often not a feasible option e.g. with dynamic addresses. A single IP_ADDRANY-bound UDP server should be able to appear to respond on the same dynamically-assigned IP address a packet is received on. Luckily, there is another way. Depending on … Read more

What’s the difference between WebSocket and plain socket communication?

December 12, 2023 by Tarik

webSockets and regular sockets are not the same thing. A webSocket runs over a regular socket, but runs its own connection scheme, security scheme and framing protocol on top of the regular socket and both endpoints must follow those additional steps for a connection to even be made. You can see the webSocket protocol here: … Read more

Tips / techniques for high-performance C# server sockets

December 12, 2023 by Tarik

Socket I/O performance has improved in .NET 3.5 environment. You can use ReceiveAsync/SendAsync instead of BeginReceive/BeginSend for better performance. Chech this out: http://msdn.microsoft.com/en-us/library/bb968780.aspx

Creating JSON objects directly from model classes in Java

December 12, 2023 by Tarik

Google GSON does this; I’ve used it on several projects and it’s simple and works well. It can do the translation for simple objects with no intervention, but there’s a mechanism for customizing the translation (in both directions,) as well. Gson g = …; String jsonString = g.toJson(new Customer());

Why is INET6_ADDRSTRLEN defined as 46 in C?

December 10, 2023 by Tarik

Why is INET6_ADDRSTRLEN defined as 46 in C? Because POSIX defines it to be 46: INET6_ADDRSTRLEN 46. Length of the string form for IPv6. While you are right that longtest IPv6 address takes 39 bytes, with IPv4 tunneling, the longest form can be 45 bytes: ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255 And the 46th byte is for the terminating nul … Read more

Create a virtual serial port connection over TCP

What is the best way to pass information between threads?

Setting the source IP for a UDP socket

What’s the difference between WebSocket and plain socket communication?

Tips / techniques for high-performance C# server sockets

Creating JSON objects directly from model classes in Java

Why is INET6_ADDRSTRLEN defined as 46 in C?

HAProxy doesn’t start, can not bind UNIX socket [/run/haproxy/admin.sock]

Is it possible to combine React Native with socket.io

Redis NodeJs server error,client is closed