mdns: Use multi/uni-cast types in API

* Original commit: espressif/esp-idf@125c312552

components/mdns/include/mdns.h

@@ -60,6 +60,14 @@ typedef enum mdns_if_internal {
     MDNS_IF_MAX
 } mdns_if_t;
 
+/**
+ * @brief mDNS query type to be explicitly set to either Unicast or Multicast
+ */
+typedef enum {
+    MDNS_QUERY_UNICAST,
+    MDNS_QUERY_MULTICAST,
+} mdns_query_transmission_type_t;
+
 /**
  * @brief   mDNS query result structure
  */
@@ -580,7 +588,7 @@ mdns_search_once_t *mdns_query_async_new(const char *name, const char *service_t
  * @param  service_type service type (_http, _arduino, _ftp etc.) (NULL for host queries)
  * @param  proto        service protocol (_tcp, _udp, etc.) (NULL for host queries)
  * @param  type         type of query (MDNS_TYPE_*)
- * @param  unicast      true for Unicast query, false for Multicast query
+ * @param  transmission_type      either Unicast query, or Multicast query
  * @param  timeout      time in milliseconds to wait for answers.
  * @param  max_results  maximum results to be collected
  * @param  results      pointer to the results of the query
@@ -592,7 +600,8 @@ mdns_search_once_t *mdns_query_async_new(const char *name, const char *service_t
  *     - ESP_ERR_NO_MEM         memory error
  *     - ESP_ERR_INVALID_ARG    timeout was not given
  */
-esp_err_t mdns_query_generic(const char * name, const char * service_type, const char * proto, uint16_t type, bool unicast, uint32_t timeout, size_t max_results, mdns_result_t ** results);
+esp_err_t mdns_query_generic(const char * name, const char * service_type, const char * proto, uint16_t type,
+                             mdns_query_transmission_type_t transmission_type, uint32_t timeout, size_t max_results, mdns_result_t ** results);
 
 /**
  * @brief  Query mDNS for host or service