Add a command to display all SSDP discoveries on local network.

cmd/discoverall/discoverall.go

@@ -0,0 +1,38 @@
+// Example program to display all devices discovered on the local network.
+package main
+
+import (
+	"fmt"
+	"log"
+
+	"github.com/huin/goupnp"
+	"github.com/huin/goupnp/ssdp"
+)
+
+func main() {
+	if err := run(); err != nil {
+		log.Fatal(err)
+	}
+}
+
+func run() error {
+	devices, err := goupnp.DiscoverDevices(ssdp.SSDPAll)
+	if err != nil {
+		return err
+	}
+	for _, device := range devices {
+		fmt.Printf("Location: %v\n", device.Location)
+		fmt.Printf("USN: %v\n", device.USN)
+		if device.Err != nil {
+			fmt.Printf("  Error: %v\n", device.Err)
+		} else {
+			fmt.Printf("  Root v%d.%d @ %s\n",
+				device.Root.SpecVersion.Major, device.Root.SpecVersion.Minor,
+				device.Root.URLBaseStr)
+			fmt.Printf("  Type: %s\n", device.Root.Device.DeviceType)
+			fmt.Printf("  Friendly name: %s\n", device.Root.Device.FriendlyName)
+			fmt.Printf("  Num devices: %d\n", len(device.Root.Device.Devices))
+		}
+	}
+	return nil
+}