+#if LIBMOSQUITTO_MAJOR == 0
+static char const *mosquitto_strerror (int code)
+{
+ switch (code)
+ {
+ case MOSQ_ERR_SUCCESS: return "MOSQ_ERR_SUCCESS";
+ case MOSQ_ERR_NOMEM: return "MOSQ_ERR_NOMEM";
+ case MOSQ_ERR_PROTOCOL: return "MOSQ_ERR_PROTOCOL";
+ case MOSQ_ERR_INVAL: return "MOSQ_ERR_INVAL";
+ case MOSQ_ERR_NO_CONN: return "MOSQ_ERR_NO_CONN";
+ case MOSQ_ERR_CONN_REFUSED: return "MOSQ_ERR_CONN_REFUSED";
+ case MOSQ_ERR_NOT_FOUND: return "MOSQ_ERR_NOT_FOUND";
+ case MOSQ_ERR_CONN_LOST: return "MOSQ_ERR_CONN_LOST";
+ case MOSQ_ERR_SSL: return "MOSQ_ERR_SSL";
+ case MOSQ_ERR_PAYLOAD_SIZE: return "MOSQ_ERR_PAYLOAD_SIZE";
+ case MOSQ_ERR_NOT_SUPPORTED: return "MOSQ_ERR_NOT_SUPPORTED";
+ case MOSQ_ERR_AUTH: return "MOSQ_ERR_AUTH";
+ case MOSQ_ERR_ACL_DENIED: return "MOSQ_ERR_ACL_DENIED";
+ case MOSQ_ERR_UNKNOWN: return "MOSQ_ERR_UNKNOWN";
+ case MOSQ_ERR_ERRNO: return "MOSQ_ERR_ERRNO";
+ }
+
+ return "UNKNOWN ERROR CODE";
+}
+#else
+/* provided by libmosquitto */
+#endif
+
+static void mqtt_free (mqtt_client_conf_t *conf)
+{
+ if (conf == NULL)
+ return;
+
+ if (conf->connected)
+ (void) mosquitto_disconnect (conf->mosq);
+ conf->connected = 0;
+ (void) mosquitto_destroy (conf->mosq);
+
+ sfree (conf->host);
+ sfree (conf->username);
+ sfree (conf->password);
+ sfree (conf->client_id);
+ sfree (conf->topic_prefix);
+ sfree (conf);
+}
+
+static char *strip_prefix (char *topic)
+{
+ size_t num = 0;
+
+ for (size_t i = 0; topic[i] != 0; i++)
+ if (topic[i] == '/')
+ num++;
+
+ if (num < 2)
+ return (NULL);
+
+ while (num > 2)
+ {
+ char *tmp = strchr (topic, '/');
+ if (tmp == NULL)
+ return (NULL);
+ topic = tmp + 1;
+ num--;
+ }
+
+ return (topic);
+}
+
+static void on_message (
+#if LIBMOSQUITTO_MAJOR == 0
+#else
+ __attribute__((unused)) struct mosquitto *m,
+#endif
+ __attribute__((unused)) void *arg,
+ const struct mosquitto_message *msg)
+{
+ value_list_t vl = VALUE_LIST_INIT;
+ data_set_t const *ds;
+ char *topic;
+ char *name;
+ char *payload;
+ int status;
+
+ if (msg->payloadlen <= 0) {
+ DEBUG ("mqtt plugin: message has empty payload");
+ return;
+ }
+
+ topic = strdup (msg->topic);
+ name = strip_prefix (topic);
+
+ status = parse_identifier_vl (name, &vl);
+ if (status != 0)
+ {
+ ERROR ("mqtt plugin: Unable to parse topic \"%s\".", topic);
+ sfree (topic);
+ return;
+ }
+ sfree (topic);
+
+ ds = plugin_get_ds (vl.type);
+ if (ds == NULL)
+ {
+ ERROR ("mqtt plugin: Unknown type: \"%s\".", vl.type);
+ return;
+ }
+
+ vl.values = calloc (ds->ds_num, sizeof (*vl.values));
+ if (vl.values == NULL)
+ {
+ ERROR ("mqtt plugin: calloc failed.");
+ return;
+ }
+ vl.values_len = ds->ds_num;
+
+ payload = malloc (msg->payloadlen+1);
+ if (payload == NULL)
+ {
+ ERROR ("mqtt plugin: malloc for payload buffer failed.");
+ sfree (vl.values);
+ return;
+ }
+ memmove (payload, msg->payload, msg->payloadlen);
+ payload[msg->payloadlen] = 0;
+
+ DEBUG ("mqtt plugin: payload = \"%s\"", payload);
+ status = parse_values (payload, &vl, ds);
+ if (status != 0)
+ {
+ ERROR ("mqtt plugin: Unable to parse payload \"%s\".", payload);
+ sfree (payload);
+ sfree (vl.values);
+ return;
+ }
+ sfree (payload);
+
+ plugin_dispatch_values (&vl);
+ sfree (vl.values);
+} /* void on_message */
+
+/* must hold conf->lock when calling. */
+static int mqtt_reconnect (mqtt_client_conf_t *conf)