Events: Add new event to report deleted messages from outbox

lib/include/mqtt_config.h

@@ -19,6 +19,8 @@
 
 #define MQTT_SKIP_PUBLISH_IF_DISCONNECTED CONFIG_MQTT_SKIP_PUBLISH_IF_DISCONNECTED
 
+#define MQTT_REPORT_DELETED_MESSAGES CONFIG_MQTT_REPORT_DELETED_MESSAGES
+
 #if CONFIG_MQTT_BUFFER_SIZE
 #define MQTT_BUFFER_SIZE_BYTE       CONFIG_MQTT_BUFFER_SIZE
 #else

lib/include/mqtt_outbox.h

@@ -44,6 +44,12 @@ esp_err_t outbox_delete(outbox_handle_t outbox, int msg_id, int msg_type);
 esp_err_t outbox_delete_msgid(outbox_handle_t outbox, int msg_id);
 esp_err_t outbox_delete_msgtype(outbox_handle_t outbox, int msg_type);
 int outbox_delete_expired(outbox_handle_t outbox, outbox_tick_t current_tick, outbox_tick_t timeout);
+/**
+ * @brief Deletes single expired message returning it's message id
+ *
+ * @return msg id of the deleted message, -1 if no expired message in the outbox
+ */
+int outbox_delete_single_expired(outbox_handle_t outbox, outbox_tick_t current_tick, outbox_tick_t timeout);
 
 esp_err_t outbox_set_pending(outbox_handle_t outbox, int msg_id, pending_state_t pending);
 esp_err_t outbox_set_tick(outbox_handle_t outbox, int msg_id, outbox_tick_t tick);

lib/mqtt_outbox.c

@@ -153,6 +153,22 @@ esp_err_t outbox_delete_msgtype(outbox_handle_t outbox, int msg_type)
     }
     return ESP_OK;
 }
+int outbox_delete_single_expired(outbox_handle_t outbox, outbox_tick_t current_tick, outbox_tick_t timeout)
+{
+    int msg_id = -1;
+    outbox_item_handle_t item, tmp;
+    STAILQ_FOREACH_SAFE(item, outbox, next, tmp) {
+        if (current_tick - item->tick > timeout) {
+            STAILQ_REMOVE(outbox, item, outbox_item, next);
+            free(item->buffer);
+            msg_id = item->msg_id;
+            free(item);
+            return msg_id;
+        }
+
+    }
+    return msg_id;
+}
 
 int outbox_delete_expired(outbox_handle_t outbox, outbox_tick_t current_tick, outbox_tick_t timeout)
 {