--- a/thermferm/mqtt.h	Sun Apr 14 12:46:02 2024 +0200
+++ b/thermferm/mqtt.h	Sun Apr 14 14:41:38 2024 +0200
@@ -49,6 +49,8 @@
 void mqtt_connect(void);
 void mqtt_disconnect(void);
 
+char *unit_data(units_list *unit, bool birth);
+
 /**
  * @brief Publish DBIRTH for all active units. If there are no active units, don't
  *        publish anything. This function should be called at program start.