Start Gotify WebSocketService on boot completed

app/src/main/java/com/github/gotify/init/BootCompletedReceiver.java

@@ -0,0 +1,28 @@
+package com.github.gotify.init;
+
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import android.os.Build;
+import com.github.gotify.Settings;
+import com.github.gotify.service.WebSocketService;
+
+public class BootCompletedReceiver extends BroadcastReceiver {
+
+    private Settings settings;
+
+    @Override
+    public void onReceive(Context context, Intent intent) {
+        settings = new Settings(context);
+
+        if (!settings.tokenExists()) {
+            return;
+        }
+
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+            context.startForegroundService(new Intent(context, WebSocketService.class));
+        } else {
+            context.startService(new Intent(context, WebSocketService.class));
+        }
+    }
+}