Changes to be committed:

modified:   cmd/pmomusic/main.go
	new file:   internal/netutils/ip_detect.go
	new file:   internal/netutils/list_all_ip.go
	modified:   internal/soap/soap.go
	modified:   internal/ssdp/responder.go
	modified:   internal/ssdp/ssdp.go
	modified:   internal/upnp/http.go
	new file:   internal/upnp/server.go
	new file:   internal/upnp/xml/AVTransport.xml
	new file:   internal/upnp/xml/ConnectionManager.xml
	new file:   internal/upnp/xml/RenderingControl.xml

internal/upnp/server.go

@@ -0,0 +1,45 @@
+package upnp
+
+import (
+	"embed"
+	"fmt"
+	"io/fs"
+	"log"
+	"net/http"
+
+	"gargoton.petite-maison-orange.fr/eric/pmomusic/internal/soap"
+)
+
+//go:embed xml/*.xml
+var embeddedXML embed.FS
+
+// ServeStaticXML mounts handlers for SCPD XML files.
+func ServeStaticXML(mux *http.ServeMux) {
+	subFS, err := fs.Sub(embeddedXML, "xml")
+	if err != nil {
+		panic("failed to create sub FS: " + err.Error())
+	}
+	mux.Handle("/scpd/", http.StripPrefix("/scpd/", http.FileServer(http.FS(subFS))))
+}
+
+func StartHTTPServer(usn, ip string, port uint) {
+	mux := http.NewServeMux()
+
+	// Device description
+	mux.HandleFunc("/description.xml", func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "text/xml")
+		w.Write([]byte(generateDeviceDescription(usn, ip, port)))
+	})
+
+	// SOAP control endpoints
+	mux.HandleFunc("/upnp/control/AVTransport", soap.HandleSOAP)
+	mux.HandleFunc("/upnp/control/RenderingControl", soap.HandleSOAP)
+	mux.HandleFunc("/upnp/control/ConnectionManager", soap.HandleSOAP)
+
+	// Serve static SCPD XML files
+	ServeStaticXML(mux)
+
+	addr := fmt.Sprintf("%s:%d", ip, port)
+	log.Printf("Serving UPnP fake renderer at http://%s", addr)
+	log.Fatal(http.ListenAndServe(addr, mux))
+}