> For the complete documentation index, see [llms.txt](https://assetstore.essentialkit.voxelbusters.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://assetstore.essentialkit.voxelbusters.com/features/network-services/playmaker/use-cases/use-case-2-server-health.md).

# Server Health Monitoring (Host Reachability)

## Goal

Monitor the configured host reachability and switch to a fallback when it becomes unreachable.

## Prerequisite

Set the host address in Essential Kit settings (Network Services section).

## Actions used

* `NetworkServicesStartNotifier`
* `NetworkServicesOnHostReachabilityChanged` (persistent listener)
* `NetworkServicesGetStatus` (optional)

## Variables

* `isHostReachable` (Bool)

## Flow

1. On app launch: call `NetworkServicesStartNotifier`.
2. Keep `NetworkServicesOnHostReachabilityChanged` in an active state:
   * `eventReachable` → use primary host
   * `eventUnreachable` → show maintenance / switch to backup
3. Optional: call `NetworkServicesGetStatus` whenever you need the latest booleans (`isHostReachable`, `isInternetActive`).