diff -r b88c60e8369e -r d1c52fb43e30 thermferm/server.c
--- a/thermferm/server.c	Tue Nov 11 16:19:07 2014 +0100
+++ b/thermferm/server.c	Sat Nov 15 20:35:32 2014 +0100
@@ -631,8 +631,10 @@
  */
 int cmd_list(char *buf)
 {
-    char		*opt, *param, *filename, q[5], buffer[256], *copy = NULL;
-    char		*mode_o = NULL, *mode_n, *heater_o = NULL, *heater_n, *cooler_o = NULL, *cooler_n;
+    char		*opt, *param, *filename, q[5], buffer[256], outbuf[256];
+    char		*date_n, *mode_n, *air_n, *beer_n, *target_n, *heater_n, *cooler_n;
+    char		*heater_u, *cooler_u;
+    int			heater_l = 0, cooler_l = 0, h = 0, c = 0, heat_used = 0, cool_used = 0;
     units_list		*unit;
     FILE		*fp;
 
@@ -675,54 +677,55 @@
 	filename = xstrcat(filename, (char *)".log");
 	if ((fp = fopen(filename, "r"))) {
 	    while (fgets(buffer, sizeof(buffer)-1, fp) != NULL) {
+		/*
+		 * 2014-11-15 18:39,BEER,20.312,19.750,20.0,0,NA,NA,NA,78105,NA,NA
+		 */
 		buffer[strlen(buffer) -1] = '\0';
-		copy = xstrcpy(buffer);
-		mode_n = strtok(buffer, ",\0");
-		mode_n = strtok(NULL, ",\0");
-		heater_n = strtok(NULL, ",\0");	/* skip air_temp	*/
-		heater_n = strtok(NULL, ",\0");	/* skip beer temp	*/
-		heater_n = strtok(NULL, ",\0"); /* skip target temp	*/
-		heater_n = strtok(NULL, ",\0");
-		cooler_n = strtok(NULL, ",\0");
+		date_n = strtok(buffer, ",\0");	/* timestamp		*/
+		mode_n = strtok(NULL, ",\0");	/* unit mode		*/
+		air_n = strtok(NULL, ",\0");	/* air temp		*/
+		beer_n = strtok(NULL, ",\0");	/* beer temp		*/
+		target_n = strtok(NULL, ",\0"); /* target temp		*/
+		heater_n = strtok(NULL, ",\0");	/* current heater state	*/
+		cooler_n = strtok(NULL, ",\0");	/* current cooler state	*/
+		heater_u = strtok(NULL, ",\0");	/* current fan state	*/
+		heater_u = strtok(NULL, ",\0");	/* current door state	*/
+		heater_u = strtok(NULL, ",\0");	/* heater use counter	*/
+		cooler_u = strtok(NULL, ",\0");	/* cooler use counter	*/
 
 		if (strncmp(mode_n, (char *)"Mode", 4)) {
 		    /*
-		     * Output a line each 10 minutes or if something changes.
+		     * Output a line each 30 minutes.
 		     */
 		    if ((q[0] != buffer[11]) || (q[1] != buffer[12]) || (q[3] != buffer[14])) {
 			q[0] = buffer[11];
 			q[1] = buffer[12];
 			q[2] = buffer[13];
 			q[3] = buffer[14];
-			if ((q[3] == '0') || (q[3] == '3'))
-		    	    srv_send(copy);
-		    } else if ((mode_o && strcmp(mode_o, mode_n)) ||
-			       (heater_o && strcmp(heater_o, heater_n)) || (cooler_o && strcmp(cooler_o, cooler_n))) {
-			srv_send(copy);
+			if ((q[3] == '0') || (q[3] == '3')) {
+			    heat_used = cool_used = 0;
+			    if (strcmp(heater_u, "NA") && (sscanf(heater_u, "%d", &h) == 1)) {
+				if (h && heater_l) {
+				    heat_used = ((h - heater_l) * 100) / 1800;
+				}
+			    }
+			    if (strcmp(cooler_u, "NA") && (sscanf(cooler_u, "%d", &c) == 1)) {
+				if (c && cooler_l) {
+				    cool_used = ((c - cooler_l) * 100) / 1800;
+				}
+			    }
+			    snprintf(outbuf, 255, "%s,%s,%s,%s,%s,%s,%s,%d,%d", 
+					    date_n, mode_n, air_n, beer_n, target_n, heater_n, cooler_n, heat_used, cool_used);
+		    	    srv_send(outbuf);
+			    if (h && strcmp(heater_u, "NA"))
+				heater_l = h;
+			    if (c & strcmp(cooler_u, "NA"))
+				cooler_l = c;
+			}
 		    }
 	    	}
-		free(copy);
-		copy = NULL;
-		if (mode_o)
-		    free(mode_o);
-		mode_o = xstrcpy(mode_n);
-		if (heater_o)
-		    free(heater_o);
-		heater_o = xstrcpy(heater_n);
-		if (cooler_o)
-		    free(cooler_o);
-		cooler_o = xstrcpy(cooler_n);
 	    }
 	}
-	if (mode_o)
-	    free(mode_o);
-	mode_o = NULL;
-	if (heater_o)
-	    free(heater_o);
-	heater_o = NULL;
-	if (cooler_o)
-	    free(cooler_o);
-	cooler_o = NULL;
 	free(filename);
 	filename = NULL;
 	srv_send((char *)".");