diff -r 003c20125212 -r 862de87f9f89 thermferm/mqtt.c
--- a/thermferm/mqtt.c	Thu May 12 21:43:07 2016 +0200
+++ b/thermferm/mqtt.c	Sat Apr 29 17:07:36 2017 +0200
@@ -194,10 +194,12 @@
     if (mqtt_use) {
         /*
          * Final publish 0 to clients/<hostname>/thermferm/state
+	 * After that, remove the retained topic.
          */
         syslog(LOG_NOTICE, "MQTT disconnecting");
         sprintf(buf, "0");
         mosquitto_publish(mosq, &mqtt_mid_sent, state, strlen(buf), buf, mqtt_qos, true);
+	mosquitto_publish(mosq, &mqtt_mid_sent, state, 0, NULL, mqtt_qos, true);
         mqtt_last_mid = mqtt_mid_sent;
         mqtt_status = STATUS_WAITING;
 	mqtt_my_shutdown = TRUE;
@@ -268,3 +270,17 @@
 #endif
 }
 
+
+
+void mqtt_publish_clear(char *uuid, char *tail)
+{
+#ifdef HAVE_MOSQUITTO_H
+    char        topic[1024];
+
+    if (mqtt_use) {
+	snprintf(topic, 1023, "bmsd/%s/%s/%s", my_hostname, uuid, tail);
+	mosquitto_publish(mosq, &mqtt_mid_sent, topic, 0, NULL, mqtt_qos, 1);
+    }
+#endif
+}
+