# HG changeset patch
# User Michiel Broek <mbroek@mbse.eu>
# Date 1570732959 -7200
# Node ID a8a6901b5a994eef7d6dfaec0b118e9fdb40ffe9
# Parent  9c41e865144a9c0b0f8e2745e3e6ef78c26f1211
Added CO2 meter units to the daemon.

diff -r 9c41e865144a -r a8a6901b5a99 bmsd/Makefile
--- a/bmsd/Makefile	Wed Oct 09 22:39:46 2019 +0200
+++ b/bmsd/Makefile	Thu Oct 10 20:42:39 2019 +0200
@@ -55,7 +55,7 @@
 
 # DO NOT DELETE THIS LINE - MAKE DEPEND RELIES ON IT
 # Dependencies generated by make depend
-mqtt.o: bms.h xutil.h mqtt.h nodes.h fermenters.h
+mqtt.o: bms.h xutil.h mqtt.h nodes.h fermenters.h co2meters.h
 lock.o: lock.h bms.h futil.h
 nodes.o: bms.h xutil.h nodes.h mysql.h
 futil.o: bms.h futil.h
diff -r 9c41e865144a -r a8a6901b5a99 bmsd/bms.h
--- a/bmsd/bms.h	Wed Oct 09 22:39:46 2019 +0200
+++ b/bmsd/bms.h	Thu Oct 10 20:42:39 2019 +0200
@@ -76,7 +76,7 @@
 
 
 /**
- * @brief Structure for the nodes. Database table 'nodes'.
+ * @brief Structure for the nodes. Database table 'mon_nodes'.
  */
 typedef struct _sys_node_list {
     struct _sys_node_list	*next;
@@ -151,7 +151,7 @@
 
 
 /**
- * @brief Structure for the fermenters. Stored in database table 'fermenters'.
+ * @brief Structure for the fermenters. Stored in database table 'mon_fermenters'.
  */
 typedef struct _fermenter_list {
     struct _fermenter_list	*next;
@@ -249,6 +249,47 @@
 
 
 /**
+ * @brief Structure for the co2meters. Stored in database table 'mon_co2meters'.
+ */
+typedef struct _co2meter_list {
+    struct _co2meter_list	*next;
+    char                        *uuid;                  ///< Fixed uuid string
+    char                        *alias;                 ///< Fixed short name
+    char                        *node;                  ///< Fixed node name
+    bool                        online;                 ///< Online status
+    char			*mode;			///< Working mode
+    char                        *beercode;              ///< Beer unique code
+    char                        *beername;              ///< Beer name in fermenter
+    char                        *beeruuid;              ///< Beer uuid in fermenter
+    char			*temperature_state;	///< Temperature sensor state
+    char			*temperature_address;	///< Temperature sensor address
+    float			temperature;		///< Temperature value
+    char			*pressure_state;	///< Pressure sensor state
+    uint8_t			pressure_channel;	///< Pressure sensor channel
+    float			pressure_voltage;	///< Pressure voltage reading
+    float			pressure_zero;		///< Pressure zero offset voltage
+    float			pressure_bar;		///< Pressure in bar
+} sys_co2meter_list;
+
+
+/**
+ * @brief Strcuture holding a co2 pressure log entry.
+ */
+typedef struct co2meter_log {
+    char			*datetime;		///< Date/time stamp
+    char			*product_uuid;		///< Product uuid
+    char			*product_code;		///< Product code
+    char			*product_name;		///< Product name
+    float			temperature;		///< Temperature
+    float			pressure;		///< Pressure
+    char			*co2meter_uuid;		///< Unit uuid
+    char			*co2meter_node;		///< Unit node
+    char			*co2meter_alias;	///< Unit alias
+} co2pressure_log;
+
+
+
+/**
  * @brief Brew computer controllers. Must have hardware + installation + recipe data.
  */
 typedef struct _brewer_list {
diff -r 9c41e865144a -r a8a6901b5a99 bmsd/co2meters.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/bmsd/co2meters.c	Thu Oct 10 20:42:39 2019 +0200
@@ -0,0 +1,346 @@
+/**
+ * @file co2meters.c
+ * @brief Handle co2meters status
+ * @author Michiel Broek <mbroek at mbse dot eu>
+ *
+ * Copyright (C) 2019
+ *
+ * This file is part of the bms (Brewery Management System)
+ *
+ * This is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * bms is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with ThermFerm; see the file COPYING.  If not, write to the Free
+ * Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ */
+
+
+#include "bms.h"
+#include "xutil.h"
+#include "co2meters.h"
+#include "mysql.h"
+
+
+sys_co2meter_list	*co2meters = NULL;
+
+extern int		debug;
+extern sys_config       Config;
+
+
+
+void co2meter_set(char *edge_node, char *alias, char *payload)
+{
+    struct json_object	*jobj, *val, *sensor;
+    sys_co2meter_list	*co2meter, *tmpp;
+    bool		new_co2meter = true;
+
+//    fprintf(stdout, "co2meter_set: %s/%s %s\n", edge_node, alias, payload);
+
+    /*
+     * Search co2meter record in the memory array and use it if found.
+     */
+    if (co2meters) {
+	for (tmpp = co2meters; tmpp; tmpp = tmpp->next) {
+	    if ((strcmp(tmpp->alias, alias) == 0) && (strcmp(tmpp->node, edge_node) == 0)) {
+		new_co2meter = false;
+		co2meter = tmpp;
+		break;
+	    }
+	}
+    }
+
+//    printf("new_co2meter %s\n", new_co2meter ? "true":"false");
+
+    /*
+     * Allocate new co2meter if not yet known.
+     */
+    if (new_co2meter) {
+	co2meter = (sys_co2meter_list *)malloc(sizeof(sys_co2meter_list));
+	memset(co2meter, 0, sizeof(sys_co2meter_list));
+	co2meter->alias = xstrcpy(alias);
+	co2meter->node = xstrcpy(edge_node);
+	co2meter->mode = xstrcpy((char *)"OFF");
+    }
+
+    if (! co2meter->online) {
+    	co2meter->online = true;
+    	syslog(LOG_NOTICE, "Online co2meter %s/%s mode %s", edge_node, alias, co2meter->mode);
+    }
+
+    /*
+     * Process the JSON formatted payload. 
+     * Update only the fields that are found in the payload.
+     */
+    jobj = json_tokener_parse(payload);
+
+    if (json_object_object_get_ex(jobj, "uuid", &val)) {
+	if (co2meter->uuid)
+	    free(co2meter->uuid);
+	co2meter->uuid = xstrcpy((char *)json_object_get_string(val));
+    }
+    if (json_object_object_get_ex(jobj, "mode", &val)) {
+	if (co2meter->mode) {
+	    if (strcmp(co2meter->mode, (char *)json_object_get_string(val))) {
+		syslog(LOG_NOTICE, "Change mode co2meter %s/%s: %s to %s", edge_node, alias, co2meter->mode, (char *)json_object_get_string(val));
+	    }
+	    free(co2meter->mode);
+	}
+	co2meter->mode = xstrcpy((char *)json_object_get_string(val));
+    }
+    if (json_object_object_get_ex(jobj, "temperature", &sensor)) {
+	if (json_object_object_get_ex(sensor, "address", &val)) {
+	    if (co2meter->temperature_address)
+		free(co2meter->temperature_address);
+	    co2meter->temperature_address = xstrcpy((char *)json_object_get_string(val));
+	}
+	if (json_object_object_get_ex(sensor, "state", &val)) {
+	    if (co2meter->temperature_state)
+		free(co2meter->temperature_state);
+	    co2meter->temperature_state = xstrcpy((char *)json_object_get_string(val));
+	}
+	if (json_object_object_get_ex(sensor, "temperature", &val)) {
+	    co2meter->temperature = json_object_get_double(val);
+	}
+    }
+    if (json_object_object_get_ex(jobj, "pressure", &sensor)) {
+	if (json_object_object_get_ex(sensor, "state", &val)) {
+            if (co2meter->pressure_state)
+                free(co2meter->pressure_state);
+            co2meter->pressure_state = xstrcpy((char *)json_object_get_string(val));
+        }
+	if (json_object_object_get_ex(sensor, "channel", &val)) {
+            co2meter->pressure_channel = json_object_get_int(val);
+        }
+	if (json_object_object_get_ex(sensor, "voltage", &val)) {
+            co2meter->pressure_voltage = json_object_get_double(val);
+        }
+	if (json_object_object_get_ex(sensor, "zero", &val)) {
+            co2meter->pressure_zero = json_object_get_double(val);
+        }
+	if (json_object_object_get_ex(sensor, "bar", &val)) {
+            co2meter->pressure_bar = json_object_get_double(val);
+        }
+    }
+    json_object_put(jobj);
+
+//    co2meter_dump(co2meter);
+
+    if (new_co2meter) {
+    	if (co2meters == NULL) {
+	    co2meters = co2meter;
+	} else {
+	    for (tmpp = co2meters; tmpp; tmpp = tmpp->next) {
+		if (tmpp->next == NULL) {
+		    tmpp->next = co2meter;
+		    break;
+		}
+	    }
+	}
+	co2meter_mysql_insert(co2meter);
+    } else {
+	co2meter_mysql_update(co2meter);
+    }
+
+}
+
+
+
+/*
+ * With DBIRTH all active co2meters are publishd in an array.
+ */
+void co2meter_birth_data(char *topic, char *payload)
+{
+    char		*message_type, *edge_node, *alias;
+    struct json_object  *jobj, *val, *metric, *units, *unit;
+    int			arraylen;
+
+    strtok(topic, "/"); // ignore namespace
+    strtok(NULL, "/");
+    message_type = strtok(NULL, "/");
+    edge_node = strtok(NULL, "/\0");
+    alias = strtok(NULL, "/\0");
+
+    if ((alias == NULL) && (strcmp("DBIRTH", message_type) == 0)) {
+	/*
+	 * Global initial DBIRTH message with array of co2meters.
+	 */
+	jobj = json_tokener_parse(payload);
+
+	if (json_object_object_get_ex(jobj, "metric", &metric)) {
+	    if (json_object_object_get_ex(metric, "units", &units)) {
+		arraylen = json_object_array_length(units);
+		for (int i = 0; i < arraylen; i++) {
+		    /*
+		     * Parse the array of units
+		     */
+		    unit = json_object_array_get_idx(units, i);
+
+		    if (json_object_object_get_ex(unit, "alias", &val)) {
+			if (alias)
+			    free(alias);
+			alias = xstrcpy((char *)json_object_get_string(val));
+		    	co2meter_set(edge_node, alias, (char *)json_object_to_json_string_ext(unit, 0));
+			free(alias);
+			alias = NULL;
+		    }
+		}
+	    }
+	}
+	json_object_put(jobj);
+	return;
+    }
+
+    /*
+     * The rest are errors.
+     */
+    printf("ERROR co2meter_birth_data: %s %s %s\n", message_type, edge_node, alias);
+}
+
+
+
+void co2meter_log(char *topic, char *payload)
+{
+    char                *edge_node, *alias, *line, buf[65], *logfile;
+    struct json_object  *jobj, *val, *metric;
+    co2pressure_log	*log;
+    struct tm		*mytime;
+    time_t		timestamp;
+    FILE		*fp;
+
+    strtok(topic, "/"); // ignore namespace
+    strtok(NULL, "/");	// group_id
+    strtok(NULL, "/");	// message_type
+    edge_node = strtok(NULL, "/\0");
+    alias = strtok(NULL, "/\0");
+
+    log = (co2pressure_log *)malloc(sizeof(co2pressure_log));
+    memset(log, 0, sizeof(co2pressure_log));
+
+    log->co2meter_node = xstrcpy(edge_node);
+    log->co2meter_alias = xstrcpy(alias);
+    jobj = json_tokener_parse(payload);
+
+    timestamp = time(NULL);
+    log->datetime = malloc(21);
+    mytime = localtime(&timestamp);
+    snprintf(log->datetime, 20, "%04d-%02d-%02d %02d:%02d:%02d", 
+	mytime->tm_year + 1900, mytime->tm_mon + 1, mytime->tm_mday, mytime->tm_hour, mytime->tm_min, mytime->tm_sec);
+
+    if (json_object_object_get_ex(jobj, "metric", &metric)) {
+
+/*	    if (json_object_object_get_ex(metric2, "uuid", &val)) {
+		if (strcmp((char *)"(null)", json_object_get_string(val)))
+		    log->product_uuid = xstrcpy((char *)json_object_get_string(val));
+	    }
+	    if (json_object_object_get_ex(metric2, "code", &val)) {
+		if (strcmp((char *)"(null)", json_object_get_string(val)))
+		    log->product_code = xstrcpy((char *)json_object_get_string(val));
+	    }
+	    if (json_object_object_get_ex(metric2, "name", &val)) {
+		if (strcmp((char *)"(null)", json_object_get_string(val)))
+		    log->product_name = xstrcpy((char *)json_object_get_string(val));
+	    }
+*/
+	if (json_object_object_get_ex(metric, "co2meter_uuid", &val)) {
+	    if (strcmp((char *)"(null)", json_object_get_string(val)))
+	    	log->co2meter_uuid = xstrcpy((char *)json_object_get_string(val));
+	}
+	if (json_object_object_get_ex(metric, "temperature", &val)) {
+	    log->temperature = json_object_get_double(val);
+	}
+	if (json_object_object_get_ex(metric, "pressure", &val)) {
+            log->pressure = json_object_get_double(val);
+        }
+    }
+    json_object_put(jobj);
+
+    /*
+     * Because co2meters are not so smart and don't hold product information
+     * search the missing pieces in the database.
+     */
+    // log->co2meter_uuid is the search, fill:
+    // log->product_uuid log->product_name log->product_code
+    // log->co2meter_node log->co2meter_alias
+
+    /*
+     * Build csv log line
+     */
+    line = xstrcpy(log->datetime);
+    line = xstrcat(line, (char *)",");
+    snprintf(buf, 64, "%.3f", log->temperature);
+    line = xstrcat(line, buf);
+    line = xstrcat(line, (char *)",");
+    snprintf(buf, 64, "%.3f", log->pressure);
+    line = xstrcat(line, buf);
+    line = xstrcat(line, (char *)",");
+    line = xstrcat(line, log->co2meter_uuid);
+
+    /*
+     * Build logfile name
+     */
+    logfile = xstrcpy(Config.web_root);
+    logfile = xstrcat(logfile, (char *)"/log/co2pressure/");
+    logfile = xstrcat(logfile, log->product_code);
+    logfile = xstrcat(logfile, (char *)" ");
+    logfile = xstrcat(logfile, log->product_name);
+    logfile = xstrcat(logfile, (char *)".log");
+
+    if (debug)
+	fprintf(stdout, "%s %s\n", logfile, line);
+
+    fp = fopen(logfile, "a");
+    if (fp) {
+	fprintf(fp, "%s\n", line);
+	fclose(fp);
+    } else {
+	syslog(LOG_NOTICE, "cannot append to `%s'", logfile);
+    }
+
+    free(logfile);
+    logfile = NULL;
+    free(line);
+    line = NULL;
+
+    if (log->datetime)
+    	free(log->datetime);
+    if (log->product_uuid )
+	free(log->product_uuid );
+    if (log->product_code )
+	free(log->product_code );
+    if (log->product_name )
+	free(log->product_name );
+    if (log->co2meter_uuid)
+	free(log->co2meter_uuid);
+    if (log->co2meter_node)
+	free(log->co2meter_node);
+    if (log->co2meter_alias)
+	free(log->co2meter_alias);
+    free(log);
+}
+
+
+
+void co2meter_dump(sys_co2meter_list *co2meter)
+{
+    if (debug) {
+    	printf("uuid        %s\n", co2meter->uuid);
+    	printf("alias       %s\n", co2meter->alias);
+    	printf("node        %s\n", co2meter->node);
+	printf("online      %s\n", co2meter->online ? "yes":"no");
+	printf("product     %s / %s\n", co2meter->beercode, co2meter->beername);
+	printf("Temperature %-16s %10s %8.3f\n", co2meter->temperature_address, co2meter->temperature_state, co2meter->temperature);
+	printf("Pressure    %10s %d %.3f %.3f %.3f\n", co2meter->pressure_state, co2meter->pressure_channel,
+				co2meter->pressure_voltage, co2meter->pressure_zero, co2meter->pressure_bar);
+	printf("mode        %s\n", co2meter->mode);
+    }
+}
+
+
diff -r 9c41e865144a -r a8a6901b5a99 bmsd/co2meters.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/bmsd/co2meters.h	Thu Oct 10 20:42:39 2019 +0200
@@ -0,0 +1,26 @@
+/**
+ * @file co2meters.h
+ */
+
+#ifndef _CO2METERS_H
+#define _CO2METERS_H
+
+void co2meter_dump(sys_co2meter_list *co2meter);
+
+/**
+ * @brief Birth of a co2meter or data update. Create it in the database if 
+ *        never seen before, else just update the database entry.
+ * @param topic The MQTT topic string, contains the co2meter type and name.
+ * @param payload The JSON formatted payload with the co2meter details.
+ */
+void co2meter_birth_data(char *topic, char *payload);
+
+/**
+ * @brief Data logging from co2meters.
+ * @param topic The MQTT topic string, contains the co2meter type and name.
+ * @param payload The JSON formatted payload with the co2meter details.
+ */
+void co2meter_log(char *topic, char *payload);
+
+
+#endif
diff -r 9c41e865144a -r a8a6901b5a99 bmsd/mqtt.c
--- a/bmsd/mqtt.c	Wed Oct 09 22:39:46 2019 +0200
+++ b/bmsd/mqtt.c	Thu Oct 10 20:42:39 2019 +0200
@@ -1,5 +1,5 @@
 /*****************************************************************************
- * Copyright (C) 2017-2018
+ * Copyright (C) 2017-2019
  *   
  * Michiel Broek <mbroek at mbse dot eu>
  *
@@ -25,6 +25,7 @@
 #include "mqtt.h"
 #include "nodes.h"
 #include "fermenters.h"
+#include "co2meters.h"
 
 
 extern sys_config       Config;
@@ -98,7 +99,7 @@
 	topic = xstrcpy((char *)"mbv1.0/fermenters/#");	// Subscribe to fermenter messages.
 	mosquitto_subscribe(mosq, NULL, topic, 0);
 	free(topic);
-	topic = xstrcpy((char *)"mbv1.0/co2meter/#");	// Subscribe to co2meter messages.
+	topic = xstrcpy((char *)"mbv1.0/co2meters/#");	// Subscribe to co2meter messages.
 	mosquitto_subscribe(mosq, NULL, topic, 0);
 	free(topic);
 	topic = NULL;
@@ -170,6 +171,14 @@
 	    fermenter_log(message->topic, (char *)message->payload);
 	    return;
 	}
+	if (strstr(message->topic, (char *)"co2meters") &&  strstr(message->topic, (char *)"DBIRTH")) {
+            co2meter_birth_data(message->topic, (char *)message->payload);
+            return;
+        }
+        if (strstr(message->topic, (char *)"co2meters") && strstr(message->topic, (char *)"DLOG")) {
+            co2meter_log(message->topic, (char *)message->payload);
+            return;
+        }
 	syslog(LOG_NOTICE, "MQTT: message callback %s :: %d", message->topic, message->payloadlen);
     } else {
 	if (strstr(message->topic, (char *)"NBIRTH")) {
diff -r 9c41e865144a -r a8a6901b5a99 bmsd/mysql.c
--- a/bmsd/mysql.c	Wed Oct 09 22:39:46 2019 +0200
+++ b/bmsd/mysql.c	Thu Oct 10 20:42:39 2019 +0200
@@ -35,6 +35,7 @@
 extern sys_config       	Config;
 extern sys_node_list		*nodes;
 extern sys_fermenter_list	*fermenters;
+extern sys_co2meter_list	*co2meters;
 extern int              	debug;
 
 
@@ -60,7 +61,8 @@
 {
     sys_node_list	*node, *tmpp;
     sys_fermenter_list	*fermenter, *tmpf;
-    int			ncnt = 0, fcnt = 0;
+    sys_co2meter_list	*co2meter, *tmpc;
+    int			ccnt = 0, ncnt = 0, fcnt = 0;
 
     con = mysql_init(NULL);
     if (con == NULL) {
@@ -226,7 +228,51 @@
 	}
     }
 
-    syslog(LOG_NOTICE, "MySQL: loaded %d nodes, %d fermenters", ncnt, fcnt);
+    if (mysql_query(con, "SELECT * FROM mon_co2meters")) {
+        syslog(LOG_NOTICE, "MySQL: SELECT * FROM mon_co2meters error %u (%s))", mysql_errno(con), mysql_error(con));
+    } else {
+        res_set = mysql_store_result(con);
+        if (res_set == NULL) {
+            syslog(LOG_NOTICE, "MySQL: mysq_store_result error %u (%s))", mysql_errno(con), mysql_error(con));
+        } else {
+            while ((row = mysql_fetch_row(res_set)) != NULL) {
+                co2meter = (sys_co2meter_list *)malloc(sizeof(sys_co2meter_list));
+                memset(co2meter, 0, sizeof(sys_co2meter_list));
+                co2meter->next                = NULL;
+                co2meter->uuid                = xstrcpy(row[1]);
+                co2meter->alias               = xstrcpy(row[2]);
+                co2meter->node                = xstrcpy(row[3]);
+                co2meter->online              = 0;    // Will be set later
+                co2meter->beercode            = xstrcpy(row[5]);
+                co2meter->beername            = xstrcpy(row[6]);
+                co2meter->beeruuid            = xstrcpy(row[7]);
+		co2meter->mode                = xstrcpy(row[8]);
+		co2meter->temperature_state   = xstrcpy(row[9]);
+		co2meter->temperature_address = xstrcpy(row[10]);
+		co2meter->temperature         = atof(row[11]);
+		co2meter->pressure_state      = xstrcpy(row[12]);
+		co2meter->pressure_channel    = atoi(row[13]);
+		co2meter->pressure_voltage    = atof(row[14]);
+		co2meter->pressure_zero       = atof(row[15]);
+		co2meter->pressure_bar        = atof(row[16]);
+
+		if (co2meters == NULL) {
+                    co2meters = co2meter;
+                } else {
+                    for (tmpc = co2meters; tmpc; tmpc = tmpc->next) {
+                        if (tmpc->next == NULL) {
+                            tmpc->next = co2meter;
+                            break;
+                        }
+                    }
+                }
+		ccnt++;
+	    }
+	    mysql_free_result(res_set);
+	}
+    }
+
+    syslog(LOG_NOTICE, "MySQL: loaded %d nodes, %d fermenters, %d co2meters", ncnt, fcnt, ccnt);
     return 0;
 }
 
@@ -234,6 +280,7 @@
 
 void bms_mysql_end(void)
 {
+    sys_co2meter_list	*tmpp, *oldtmpp;
     sys_fermenter_list	*tmpf, *oldtmpf;
     sys_node_list	*tmpn, *oldtmpn;
 
@@ -243,6 +290,28 @@
     if (debug)
 	fprintf(stdout, "MySQL: disconnected\n");
 
+    for (tmpp = co2meters; tmpp; tmpp = oldtmpp) {
+        oldtmpp = tmpp->next;
+        if (tmpp->uuid)
+            free(tmpp->uuid);
+        if (tmpp->alias)
+            free(tmpp->alias);
+        if (tmpp->node)
+            free(tmpp->node);
+        if (tmpp->beercode)
+            free(tmpp->beercode);
+        if (tmpp->beername)
+            free(tmpp->beername);
+        if (tmpp->beeruuid)
+            free(tmpp->beeruuid);
+        if (tmpp->temperature_address)
+            free(tmpp->temperature_address);
+        if (tmpp->temperature_state)
+            free(tmpp->temperature_state);
+        if (tmpp->pressure_state)
+            free(tmpp->pressure_state);
+        free(tmpp);
+    }
     for (tmpf = fermenters; tmpf; tmpf = oldtmpf) {
 	oldtmpf = tmpf->next;
 	if (tmpf->uuid)
@@ -531,3 +600,58 @@
 }
 
 
+
+void co2meter_mysql_insert(sys_co2meter_list *co2meter)
+{
+    char        *query = malloc(2560);
+
+    snprintf(query, 2559,
+        "INSERT INTO mon_co2meters SET uuid='%s', alias='%s', node='%s', online='%d', mode='%s', " \
+        "temperature_address='%s', temperature_state='%s', temperature='%.3f', " \
+	"pressure_state='%s', pressure_channel='%d', pressure_voltage='%.3f', pressure_zero='%.3f', pressure_bar='%.3f'",
+        co2meter->uuid, co2meter->alias, co2meter->node, co2meter->online ? 1:0, co2meter->mode,
+        co2meter->temperature_address, co2meter->temperature_state, co2meter->temperature,
+	co2meter->pressure_state, co2meter->pressure_channel, co2meter->pressure_voltage, co2meter->pressure_zero, co2meter->pressure_bar);
+
+    if (bms_mysql_query(query) == 0) {
+        syslog(LOG_NOTICE,  "MySQL: insert new co2meter %s/%s", co2meter->node, co2meter->alias);
+    }
+    free(query);
+}
+
+
+
+void co2meter_mysql_update(sys_co2meter_list *co2meter)
+{
+    char        *query = malloc(2560);
+
+    snprintf(query, 2559,
+        "UPDATE mon_co2meters SET online='%d', mode='%s', " \
+	"temperature_address='%s', temperature_state='%s', temperature='%.3f', " \
+        "pressure_state='%s', pressure_channel='%d', pressure_voltage='%.3f', pressure_zero='%.3f', pressure_bar='%.3f' " \
+	"WHERE uuid='%s'",
+        co2meter->online ? 1:0, co2meter->mode,
+	co2meter->temperature_address, co2meter->temperature_state, co2meter->temperature,
+        co2meter->pressure_state, co2meter->pressure_channel, co2meter->pressure_voltage, co2meter->pressure_zero, co2meter->pressure_bar,
+	co2meter->uuid);
+
+    bms_mysql_query(query);
+    free(query);
+}
+
+
+
+void co2meter_mysql_death(char *node, char *alias)
+{
+    char        *query = malloc(512);
+
+    if (alias)
+        snprintf(query, 511, "UPDATE mon_co2meters SET online='0' WHERE node='%s' and alias='%s'", node, alias);
+    else
+        snprintf(query, 511, "UPDATE mon_co2meters SET online='0' WHERE node='%s'", node);
+
+    bms_mysql_query(query);
+    free(query);
+}
+
+
diff -r 9c41e865144a -r a8a6901b5a99 bmsd/mysql.h
--- a/bmsd/mysql.h	Wed Oct 09 22:39:46 2019 +0200
+++ b/bmsd/mysql.h	Thu Oct 10 20:42:39 2019 +0200
@@ -37,5 +37,9 @@
 void fermenter_mysql_update(sys_fermenter_list *fermenter);
 void fermenter_mysql_death(char *node, char *alias);
 
+void co2meter_mysql_insert(sys_co2meter_list *co2meter);
+void co2meter_mysql_update(sys_co2meter_list *co2meter);
+void co2meter_mysql_death(char *node, char *alias);
+
 
 #endif
diff -r 9c41e865144a -r a8a6901b5a99 bmsd/nodes.c
--- a/bmsd/nodes.c	Wed Oct 09 22:39:46 2019 +0200
+++ b/bmsd/nodes.c	Thu Oct 10 20:42:39 2019 +0200
@@ -3,7 +3,7 @@
  * @brief Handle nodes status
  * @author Michiel Broek <mbroek at mbse dot eu>
  *
- * Copyright (C) 2018
+ * Copyright (C) 2018-2019
  *
  * This file is part of the bms (Brewery Management System)
  *
@@ -33,6 +33,8 @@
 
 extern int			debug;
 extern sys_fermenter_list	*fermenters;
+extern sys_co2meter_list	*co2meters;
+
 
 
 void node_birth_data(char *topic, char *payload)
@@ -244,6 +246,7 @@
 {
     sys_node_list	*tmpn;
     sys_fermenter_list  *tmpf;
+    sys_co2meter_list	*tmpc;
     time_t		now = time(NULL);
 
     for (tmpn = nodes; tmpn; tmpn = tmpn->next) {
@@ -261,6 +264,16 @@
 		    }
             	}
             }
+
+	    for (tmpc = co2meters; tmpc; tmpc = tmpc->next) {
+		if (strcmp(tmpc->node, tmpn->node) == 0) {
+		    if (tmpc->online) {
+			syslog(LOG_NOTICE, "Timeout co2meter %s/%s", tmpc->node, tmpc->alias);
+			tmpc->online = false;
+			co2meter_mysql_death(tmpc->node, tmpc->alias);
+		    }
+		}
+	    }
 	}
     }
 }