MAPG-204 clean up result sending

src/Multi/MultiConnector.php

@@ -2,7 +2,7 @@
 
 class MultiConnector
 {
-    public function sendMessage(string $func, array $args = []): void
+    public function sendMessage(string $func, array $args = [])
     {
         $message = json_encode([
             'func' => $func,
@@ -17,8 +17,10 @@ class MultiConnector
         }
         fclose($connection);
 
-        if ($response !== 'OK') {
-            throw new \Exception('Sending message failed with response: ' . $response);
+        $response = json_decode($response, true);
+
+        if (isset($response['data'])) {
+            return $response['data'];
         }
     }
 }