feat(mdns): Add version keys

Author: ascillato

components/mdns/CMakeLists.txt

@@ -34,7 +34,9 @@ if(${target} STREQUAL "linux")
     target_link_libraries(${COMPONENT_LIB} PRIVATE "-lbsd")
 endif()
 
-
 if(CONFIG_ETH_ENABLED)
     idf_component_optional_requires(PRIVATE esp_eth)
 endif()
+
+idf_component_get_property(MDNS_VERSION ${COMPONENT_NAME} COMPONENT_VERSION)
+target_compile_definitions(${COMPONENT_LIB} PUBLIC "-DESP_MDNS_VERSION_NUMBER=\"${MDNS_VERSION}\"")

components/mdns/examples/query_advertise/main/mdns_example_main.c

@@ -314,6 +314,8 @@ void app_main(void)
     ESP_ERROR_CHECK(esp_netif_init());
     ESP_ERROR_CHECK(esp_event_loop_create_default());
 
+    ESP_LOGI(TAG, "mDNS Ver: %s", ESP_MDNS_VERSION_NUMBER);
+
     initialise_mdns();
 
     /* This helper function configures Wi-Fi or Ethernet, as selected in menuconfig.