To implement SSDP in Golang, you would need to use the net package, which provides support for network-related operations such as creating and listening for UDP connections. You would also need to use the net/http package, which provides support for the HTTP protocol, which is the basis for SSDP.

Golang, also known as Go, is a programming language developed by Google. It is a statically-typed language with syntax similar to C, but with additional features such as garbage collection and built-in support for concurrency.

Here is an example of how you might implement SSDP in Golang:

Go: 
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package main

// Import the necessary packages
import (
	"bytes"
	"net"
	"net/http"
)

func main() {
	// Create a UDP listener for SSDP messages
	listener, err := net.ListenUDP("udp", &net.UDPAddr{
		IP:   net.IPv4(239, 255, 255, 250),
		Port: 1900,
	})
	if err != nil {
		// Handle error
	}

	// Create an HTTP request to be used for sending SSDP messages
	request, err := http.NewRequest("M-SEARCH", "ssdp:discover", nil)
	if err != nil {
		// Handle error
	}

	// Set the necessary headers for the request
	request.Header.Set("ST", "ssdp:all")
	request.Header.Set("MAN", `"ssdp:discover"`)
	request.Header.Set("MX", "3")

	// Create a buffer to hold the message to be sent
	message := make([]byte, 1024)

	// Encode the HTTP request into the message buffer
	request.Write(bytes.NewBuffer(message))

	// Send the message to the multicast address
	_, err = listener.WriteToUDP(message, &net.UDPAddr{
		IP:   net.IPv4(239, 255, 255, 250),
		Port: 1900,
	})
	if err != nil {
		// Handle error
	}
}

This code creates a UDP listener on the SSDP multicast address and port, and then sends an SSDP M-SEARCH request to the same address. This will cause any other devices on the network that are listening for SSDP messages to respond with their own SSDP messages, allowing them to be discovered.