make it work

Cargo.lock

@@ -360,6 +360,7 @@ dependencies = [
  "rumqttc",
  "serde",
  "serde_json",
+ "socket2 0.4.10",
 ]
 
 [[package]]
@@ -559,6 +560,16 @@ version = "0.4.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "04dc19736151f35336d325007ac991178d504a119863a2fcb3758cdb5e52c50d"
 
+[[package]]
+name = "socket2"
+version = "0.4.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9f7916fc008ca5542385b89a3d3ce689953c143e9304a9bf8beec1de48994c0d"
+dependencies = [
+ "libc",
+ "winapi",
+]
+
 [[package]]
 name = "socket2"
 version = "0.5.10"
@@ -628,7 +639,7 @@ dependencies = [
  "mio",
  "pin-project-lite",
  "slab",
- "socket2",
+ "socket2 0.5.10",
  "tokio-macros",
  "windows-sys 0.52.0",
 ]
@@ -678,6 +689,28 @@ version = "0.11.1+wasi-snapshot-preview1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ccf3ec651a847eb01de73ccad15eb7d99f80485de043efb2f370cd654f4ea44b"
 
+[[package]]
+name = "winapi"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
+dependencies = [
+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
+
 [[package]]
 name = "windows-sys"
 version = "0.52.0"

Cargo.toml

@@ -8,3 +8,4 @@ rumqttc = "0.23"
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
 clap = { version = "4.4", features = ["derive"] }
+socket2 = "0.4.7"

README.md

@@ -0,0 +1,12 @@
+# Position client
+
+Example client to get Positon data from the bornhack pixelflut touch screen
+
+```
+./run.sh network_interface_name
+```
+
+
+The positon data is a UDP packet of 4 bytes containing 2 usigned 16bit ints for x and y on multicast group 239.1.1.1 port 1234
+
+

run.sh

@@ -0,0 +1,3 @@
+#!/bin/sh
+sudo ip addr add 239.1.1.1/32 dev $1 autojoin
+cargo run

src/main.rs

@@ -2,6 +2,8 @@ use std::net::UdpSocket;
 use std::env;
 use std::process;
 use std::convert::TryInto;
+use socket2::{Domain, Socket, Type};
+use std::net::{Ipv4Addr, SocketAddr};
 
 /// Unpacks a 4-byte slice into two u16 values (little-endian).
 fn unpack_coordinates(buffer: &[u8]) -> Option<(u16, u16)> {
@@ -21,28 +23,14 @@ fn unpack_coordinates(buffer: &[u8]) -> Option<(u16, u16)> {
 }
 
 fn main() {
-    let args: Vec<String> = env::args().collect();
 
-    if args.len() != 3 {
-        eprintln!("Usage: {} <listen_ip> <listen_port>", args[0]);
-        eprintln!("Example: {} 127.0.0.1 12345", args[0]);
-        process::exit(1);
-    }
+    let socket = Socket::new(Domain::IPV4, Type::DGRAM, None).unwrap();
+    socket.set_reuse_address(true).unwrap();
 
-    let listen_addr = &args[1];
-    let listen_port = &args[2];
-    let bind_address = format!("{}:{}", listen_addr, listen_port);
+    socket.join_multicast_v4(&Ipv4Addr::new(239, 1, 1, 1), &Ipv4Addr::new(0, 0, 0, 0)).unwrap();
+    socket.bind(&"0.0.0.0:1234".parse::<SocketAddr>().unwrap().into()).unwrap();
 
-    // Bind the UDP socket to the specified address and port.
-    let socket = match UdpSocket::bind(&bind_address) {
-        Ok(s) => s,
-        Err(e) => {
-            eprintln!("Error: Could not bind to address {}: {}", bind_address, e);
-            process::exit(1);
-        }
-    };
-
-    println!("Listening for UDP packets on {}", bind_address);
+    let socket: UdpSocket = socket.into();
 
     // Create a buffer to hold incoming data. 4 bytes for two u16 values.
     let mut buf = [0u8; 4];