diff --git a/mock-api/restServer.ts b/mock-api/restServer.ts
index 80631f208..fcb9e0dc6 100644
--- a/mock-api/restServer.ts
+++ b/mock-api/restServer.ts
@@ -318,10 +318,10 @@ function updateMask(entity: any, de: any, dd: any) {
       const old_custom_name = dd.nodes[dd_objIndex].cn;
       console.log(
         'comparing names, old (' +
-        old_custom_name +
-        ') with new (' +
-        new_custom_name +
-        ')'
+          old_custom_name +
+          ') with new (' +
+          new_custom_name +
+          ')'
       );
       if (old_custom_name !== new_custom_name) {
         changed = true;
@@ -438,9 +438,9 @@ function upgradeImportantMessages(version: string) {
 
   console.log(
     'upgradeImportantMessageType: version=' +
-    version +
-    ' type=' +
-    upgradeImportantMessageType_n
+      version +
+      ' type=' +
+      upgradeImportantMessageType_n
   );
   return { upgradeImportantMessageType: upgradeImportantMessageType_n };
 }
@@ -487,17 +487,17 @@ function get_versions() {
 
   console.log(
     'getVersions: current=' +
-    THIS_VERSION +
-    ' stable=' +
-    LATEST_STABLE_VERSION +
-    ' (upgradeable=' +
-    (STABLE_VERSION_IS_UPGRADEABLE ? 'YES' : 'NO') +
-    ') dev=' +
-    LATEST_DEV_VERSION +
-    ' (upgradeable=' +
-    (DEV_VERSION_IS_UPGRADEABLE ? 'YES' : 'NO') +
-    ')' +
-    (MOCK_OFFLINE ? ' [offline]' : '')
+      THIS_VERSION +
+      ' stable=' +
+      LATEST_STABLE_VERSION +
+      ' (upgradeable=' +
+      (STABLE_VERSION_IS_UPGRADEABLE ? 'YES' : 'NO') +
+      ') dev=' +
+      LATEST_DEV_VERSION +
+      ' (upgradeable=' +
+      (DEV_VERSION_IS_UPGRADEABLE ? 'YES' : 'NO') +
+      ')' +
+      (MOCK_OFFLINE ? ' [offline]' : '')
   );
   return data;
 }
@@ -4147,6 +4147,21 @@ let emsesp_customentities = {
       value_type: 0,
       writeable: true,
       value: 21
+    },
+    {
+      id: 0,
+      ram: 1,
+      device_id: 0,
+      type_id: 0,
+      offset: 0,
+      factor: 1,
+      name: 'message',
+      uom: 0,
+      value_type: 9,
+      writeable: true,
+      hide: false,
+      value:
+        '{"stable":{"version":"3.8.2","date":"2026-05-12"},"dev":{"version":"3.8.3-dev.5","date":"2026-05-28T09:55:29Z"}}'
     }
   ]
 };
@@ -4189,6 +4204,18 @@ let emsesp_commands = {
       cmd: 'system/message',
       value: '"hello world"',
       name: 'send_message'
+    },
+    {
+      id: 7,
+      cmd: 'custom/message',
+      value: '{"url":"http://emsesp.org/versions.json"}',
+      name: 'get_versions'
+    },
+    {
+      id: 8,
+      cmd: 'system/sendmail',
+      value: '"test email with version " + custom/message',
+      name: 'sendmail'
     }
   ]
 };