add first JSON encoder

app/Http/Controllers/ShellyLogController.php

+<?php
+
+namespace App\Http\Controllers;
+
+use Illuminate\Http\Request;
+
+class ShellyLogController extends Controller
+{
+    public function test()
+    {
+        $json = file_get_contents('http://admin:Mamueller88*@192.168.252.250/status');
+
+        $data = json_decode($json,true);
+        //dd($data['meters'][0]['total']);
+
+        $sum = $data['meters'][0]['total'] / 60 / 1000;
+
+        echo round($sum, 2).'kWh -> Total <br>';
+
+        $sum_power = $data['meters'][0]['counters'][0];
+        echo round($sum_power, 2).'W <br>';
+    }
+}

routes/web.php

 <?php
 
+namespace App\Http\Controllers;
 use Illuminate\Support\Facades\Route;
+//use App\Http\Controllers\ShellyLogController;
 
 /*
 |--------------------------------------------------------------------------
@@ -13,6 +15,10 @@
 |
 */
 
+
 Route::get('/', function () {
     return view('welcome');
 });
+
+
+Route::get('/test', [ShellyLogController::class, 'test']);