a second instance on one machine: its own data, its own peer port, and a join that says itself again when it was never seated

src-tauri/src/freenet.rs

@@ -148,15 +148,18 @@ struct NodeDirs {
     base: PathBuf,
     config: PathBuf,
     data: PathBuf,
+    /// The client API port this peer must listen on — the same one the
+    /// adapter dials. Left implicit, a second instance's peer takes the
+    /// default and quietly binds the first instance's port.
+    ws_port: u16,
 }
 
 fn node_dirs(app: &tauri::AppHandle) -> Result<NodeDirs, String> {
-    let base = app
-        .path()
-        .app_data_dir()
+    let base = crate::paths::app_data(app)
         .map_err(|e| e.to_string())?
         .join("freenet");
-    Ok(NodeDirs { config: base.join("config"), data: base.join("data"), base })
+    let ws_port = config::load(app).freenet_ws_port.unwrap_or(freenet_adapter::DEFAULT_WS_PORT);
+    Ok(NodeDirs { config: base.join("config"), data: base.join("data"), base, ws_port })
 }
 
 /// No console window for child processes on Windows.
@@ -224,6 +227,8 @@ fn spawn_node(bin: &Path, dirs: &NodeDirs, log: &Path) -> Result<Child, String>
         .arg(&dirs.config)
         .arg("--data-dir")
         .arg(&dirs.data)
+        .arg("--ws-api-port")
+        .arg(dirs.ws_port.to_string())
         .stdin(Stdio::null())
         .stdout(Stdio::from(out))
         .stderr(Stdio::from(err))