only send device update info when it is extractable

src/ebusd/bushandler.h

@@ -423,6 +423,11 @@ class BusHandler : public WaitThread {
     }
   }
 
+  /**
+   * @return the @a Device instance for accessing the bus.
+   */
+  const Device* getDevice() const { return m_device; }
+
   /**
    * Clear stored values (e.g. scan results).
    */

src/ebusd/mqtthandler.cpp

@@ -952,8 +952,10 @@ void MqttHandler::run() {
           publishDefinition(m_replacers, "def_global_uptime-", uptimeTopic, "global", "uptime", "def_global-");
           publishDefinition(m_replacers, "def_global_updatecheck-", m_globalTopic.get("", "updatecheck"), "global",
                             "updatecheck", "def_global-");
-          publishDefinition(m_replacers, "def_global_updatecheck_device-", m_globalTopic.get("", "updatecheck"), "global",
-                            "updatecheck_device", "");
+          if (m_busHandler->getDevice()->supportsEnhancedInfos()) {
+            publishDefinition(m_replacers, "def_global_updatecheck_device-", m_globalTopic.get("", "updatecheck"),
+                              "global", "updatecheck_device", "");
+          }
           publishDefinition(m_replacers, "def_global_scan-", m_globalTopic.get("", "scan"), "global", "scan",
                             "def_global-");
         }

src/lib/ebus/device.h

@@ -205,6 +205,11 @@ class Device {
    */
   bool isEnhancedProto() const { return m_enhancedProto; }
 
+  /**
+   * @return whether the device supports the ebusd enhanced protocol and supports querying extra infos.
+   */
+  bool supportsEnhancedInfos() const { return m_enhancedProto && m_extraFatures & 0x01; }
+
   /**
    * Set the @a DeviceListener.
    * @param listener the @a DeviceListener.