Golang upnp/ssdp DiscoverDevices example

Here is some general information about using SSDP with Go:

• The goupnp library is a popular library for working with SSDP and UPnP (Universal Plug and Play) protocols in Go. It provides a simple API for sending and receiving SSDP messages, as well as managing UPnP services and devices.
• To use SSDP with Go, you will first need to import the goupnp library and create a new SSDPClient object. This object allows you to send and receive SSDP messages.
• To discover devices on the local network, you can use the SSDPClient.Search method to send a search request and receive a list of matching devices.
• To communicate with a specific device, you can use the SSDPClient.GetUPnPDeviceDescription method to retrieve the device's UPnP description and get information about the services and actions it offers.
• Once you have a device description, you can use the UPnPDevice object to interact with the device and call its services and actions.

Here is an example of how you might use the goupnp library to discover devices on the local network and print their descriptions:

package main

import (
	"fmt"
	"github.com/huin/goupnp"
	"github.com/huin/goupnp/ssdp"
	"log"
)

func main() {
	// "urn:schemas-upnp-org:device:InternetGatewayDevice:1"
	devices, err := goupnp.DiscoverDevices(ssdp.UPNPRootDevice /*ssdp.SSDPAll*/)

	if err != nil {
		log.Fatal("failed to discover devices", err)
	}

	for _, device := range devices {
		if device.Err != nil {
			log.Println("failed to discover device. skipping.", device.Err, "url", device.Location.String())
			continue
		}

		fmt.Printf("%s\n", device.Location.Host)

		fmt.Printf("    Devices\n")
		device.Root.Device.VisitDevices(func(dev *goupnp.Device) {
			fmt.Printf("        %s - %s - %s\n", dev.FriendlyName, dev.Manufacturer, dev.DeviceType)
		})

		fmt.Printf("    Services:\n")
		device.Root.Device.VisitServices(func(svc *goupnp.Service) {
			fmt.Printf("        %s\n", svc.String())
		})
	}
}

This code creates a new SSDPClient object and uses the DiscoverDevices method to discover devices on the local network. It then prints the description of each device it finds.

Note that this is just an example and may not be complete or fully functional. For more detailed information and examples, please see the goupnp library documentation.