> For the complete documentation index, see [llms.txt](https://help.diarkis.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.diarkis.io/en/diarkis-modules/notifier/setup-server.md).

# Set Up Notifier Module on Server

## Overview <a href="#diarkis-room-wosettoappusuru" id="diarkis-room-wosettoappusuru"></a>

The Notifier module can be set up on TCP and UDP servers.

When using the Notifier module, it must be set up on all servers except for HTTP servers.

## Setup <a href="#birutoinkomandowokuraiantonisuru" id="birutoinkomandowokuraiantonisuru"></a>

To expose built-in commands to the client, you can use the `diarkisexec` package for setup.

Add the following to the server's main function. Below is a sample setup for a UDP server. The setup function of `diarkisexec` must be executed before calling `diarkisexec.StartDiarkis()`.

Additionally, you need to configure the message broadcast interval and content with `diarkisexec.SetupNotificationService(name, interval, callback)`.

For more details, refer to the [diarkisexec API Reference](https://docs.diarkis.io/docs/server/current/diarkis/diarkisexec/index.html).

```go
package main

import "github.com/Diarkis/diarkis/diarkisexec"

func main() {
	logConfigPath := "/configs/shared/log.json"
	meshConfigPath := ""

	diarkisexec.SetupDiarkis(logConfigPath, meshConfigPath, &diarkisexec.Modules{
		Notifier:   &diarkisexec.Options{},
	})
	diarkisexec.SetupNotificationService("Notification", 60, handleNotification)
	diarkisexec.SetupDiarkisUDPServer("/configs/udp/main.json")
	diarkisexec.StartDiarkis()
}

func handleNotification() (*diarkisexec.Notification, error) {
	// Retrieve notification data from a database by the current time
	notificationData := someDatabase.GetNotificationDataByCurrentTime(year, month, date)

	if notificationData == nil {
		// No notification data to send out
		return nil, nil
	}

	n := &diarkisexec.Notification{}
	n.ID = notificationData.ID
	n.Name = notificationData.Name

	// Ver is used by the client to identify the message when received.
	n.Ver = notificationData.Ver

	// Cmd is used by the client to identify the message when received.
	n.Cmd = notificationData.Cmd

	n.Message = []byte("Notification message says 'Hello from the server'")

	// TTL is in seconds to indicate the availability of the notification data.
	// The notification will be available for the not-connected-clients for the duration of TTL and
	// will be sent to the clients when they connect before TTL expires.
	n.TTL = int64(60 * 60) // one hour

	return n, nil
}
```


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