diff -r 4903b4da9d40 -r 602d9968960f thermferm/mqtt.c --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/thermferm/mqtt.c Mon May 02 16:15:37 2016 +0200 @@ -0,0 +1,270 @@ +/***************************************************************************** + * Copyright (C) 2016 + * + * Michiel Broek + * + * This file is part of the mbsePi-apps + * + * 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. + * + * mbsePi-apps 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 "thermferm.h" +#include "xutil.h" +#include "mqtt.h" + +extern sys_config Config; +extern int debug; + +#ifdef HAVE_MOSQUITTO_H + + +/* Global variables for use in callbacks. */ +int mqtt_qos = 0; +int mqtt_status = STATUS_CONNECTING; +int mqtt_mid_sent = 0; +int mqtt_last_mid = -1; +int mqtt_last_mid_sent = -1; +int mqtt_connected = TRUE; +int mqtt_disconnect_sent = FALSE; +int mqtt_connect_lost = FALSE; +int mqtt_my_shutdown = FALSE; +int mqtt_use = FALSE; +int keepalive = 60; +unsigned int max_inflight = 20; +struct mosquitto *mosq = NULL; +char *state = NULL; +char my_hostname[256]; + + +void my_connect_callback(struct mosquitto *my_mosq, void *obj, int result) +{ + if (mqtt_connect_lost) { + mqtt_connect_lost = FALSE; + syslog(LOG_NOTICE, "MQTT: reconnect: %s", mosquitto_connack_string(result)); + } + + if (!result) { + mqtt_status = STATUS_CONNACK_RECVD; + } else { + syslog(LOG_NOTICE, "MQTT: my_connect_callback: %s\n", mosquitto_connack_string(result)); + } +} + + + +void my_disconnect_callback(struct mosquitto *my_mosq, void *obj, int rc) +{ + if (mqtt_my_shutdown) { + syslog(LOG_NOTICE, "MQTT: acknowledged DISCONNECT from %s", Config.mosq_host); + mqtt_connected = FALSE; + } else { + /* + * The remote server was brought down. We must keep running + */ + syslog(LOG_NOTICE, "MQTT: received DISCONNECT from %s, connection lost", Config.mosq_host); + mqtt_connect_lost = TRUE; + } +} + + + +void my_publish_callback(struct mosquitto *my_mosq, void *obj, int mid) +{ + mqtt_last_mid_sent = mid; +} + + + +void my_log_callback(struct mosquitto *my_mosq, void *obj, int level, const char *str) +{ + syslog(LOG_NOTICE, "MQTT: %s", str); + if (debug) + fprintf(stdout, "MQTT: %s\n", str); +} + + + +#endif + + +void mqtt_connect(void) +{ +#ifdef HAVE_MOSQUITTO_H + char *id = NULL; + char err[1024]; + int rc; + + /* + * Initialize mosquitto communication + */ + gethostname(my_hostname, 255); + mosquitto_lib_init(); + id = xstrcpy((char *)"thermferm/"); + id = xstrcat(id, my_hostname); + if (strlen(id) > MOSQ_MQTT_ID_MAX_LENGTH) { + /* + * Enforce maximum client id length of 23 characters + */ + id[MOSQ_MQTT_ID_MAX_LENGTH] = '\0'; + } + + mosq = mosquitto_new(id, TRUE, NULL); + if (!mosq) { + switch(errno) { + case ENOMEM: + syslog(LOG_NOTICE, "MQTT: mosquitto_new: Out of memory"); + break; + case EINVAL: + syslog(LOG_NOTICE, "MQTT: mosquitto_new: Invalid id"); + break; + } + mosquitto_lib_cleanup(); + return; + } + + if (debug) { + mosquitto_log_callback_set(mosq, my_log_callback); + } + + /* + * Set our will + */ + state = xstrcpy((char *)"clients/"); + state = xstrcat(state, my_hostname); + state = xstrcat(state, (char *)"/thermferm/state"); + if ((rc = mosquitto_will_set(mosq, state, 1, (char *)"0", mqtt_qos, TRUE))) { + if (rc == MOSQ_ERR_INVAL) { + syslog(LOG_NOTICE, "MQTT: mosquitto_will_set: input parameters invalid"); + } else if (rc == MOSQ_ERR_NOMEM) { + syslog(LOG_NOTICE, "MQTT: mosquitto_will_set: Out of Memory"); + } else if (rc == MOSQ_ERR_PAYLOAD_SIZE) { + syslog(LOG_NOTICE, "MQTT: mosquitto_will_set: invalid payload size"); + } + mosquitto_lib_cleanup(); + return; + } + + mosquitto_max_inflight_messages_set(mosq, max_inflight); + mosquitto_connect_callback_set(mosq, my_connect_callback); + mosquitto_disconnect_callback_set(mosq, my_disconnect_callback); + mosquitto_publish_callback_set(mosq, my_publish_callback); + + if ((rc = mosquitto_connect(mosq, Config.mosq_host, Config.mosq_port, keepalive))) { + if (rc == MOSQ_ERR_ERRNO) { + strerror_r(errno, err, 1024); + syslog(LOG_NOTICE, "MQTT: mosquitto_connect: error: %s", err); + } else { + syslog(LOG_NOTICE, "MQTT: mosquitto_connect: unable to connect (%d)", rc); + } + mosquitto_lib_cleanup(); + syslog(LOG_NOTICE, "MQTT: will run without an MQTT broker."); + } else { + mqtt_use = TRUE; + syslog(LOG_NOTICE, "MQTT: connected with %s:%d", Config.mosq_host, Config.mosq_port); + + /* + * Initialise is complete, report our presence state + */ + mosquitto_loop_start(mosq); + mosquitto_publish(mosq, &mqtt_mid_sent, state, 1, (char *)"1", mqtt_qos, 1); + } +#endif +} + + + +void mqtt_disconnect(void) +{ +#ifdef HAVE_MOSQUITTO_H + int rc; + char buf[128]; + + if (mqtt_use) { + /* + * Final publish 0 to clients//thermferm/state + */ + syslog(LOG_NOTICE, "MQTT disconnecting"); + sprintf(buf, "0"); + mosquitto_publish(mosq, &mqtt_mid_sent, state, strlen(buf), buf, mqtt_qos, true); + mqtt_last_mid = mqtt_mid_sent; + mqtt_status = STATUS_WAITING; + mqtt_my_shutdown = TRUE; + + do { + if (mqtt_status == STATUS_WAITING) { + if (debug) + fprintf(stdout, (char *)"Waiting\n"); + if (mqtt_last_mid_sent == mqtt_last_mid && mqtt_disconnect_sent == FALSE) { + mosquitto_disconnect(mosq); + mqtt_disconnect_sent = TRUE; + } + usleep(100000); + } + rc = MOSQ_ERR_SUCCESS; + } while (rc == MOSQ_ERR_SUCCESS && mqtt_connected); + + mosquitto_loop_stop(mosq, FALSE); + mosquitto_destroy(mosq); + mosquitto_lib_cleanup(); + syslog(LOG_NOTICE, "MQTT disconnected"); + } +#endif +} + + + +void mqtt_publish_int(char *uuid, char *tail, int value) +{ +#ifdef HAVE_MOSQUITTO_H + char topic[1024], buf[128]; + + if (mqtt_use) { + snprintf(topic, 1023, "fermenter/%s/%s/%s", my_hostname, uuid, tail); + snprintf(buf, 127, "%d", value); + mosquitto_publish(mosq, &mqtt_mid_sent, topic, strlen(buf), buf, mqtt_qos, 1); + } +#endif +} + + + +void mqtt_publish_float(char *uuid, char *tail, float value, int decimals) +{ +#ifdef HAVE_MOSQUITTO_H + char topic[1024], buf[128]; + + if (mqtt_use) { + snprintf(topic, 1023, "fermenter/%s/%s/%s", my_hostname, uuid, tail); + snprintf(buf, 127, "%.*f", decimals, value); + mosquitto_publish(mosq, &mqtt_mid_sent, topic, strlen(buf), buf, mqtt_qos, 1); + } +#endif +} + + + +void mqtt_publish_str(char *uuid, char *tail, char *value) +{ +#ifdef HAVE_MOSQUITTO_H + char topic[1024], buf[128]; + + if (mqtt_use) { + snprintf(topic, 1023, "fermenter/%s/%s/%s", my_hostname, uuid, tail); + snprintf(buf, 127, "%s", value); + mosquitto_publish(mosq, &mqtt_mid_sent, topic, strlen(buf), buf, mqtt_qos, 1); + } +#endif +} +