int mqtt_unsubscribe(const char* topic)
{
if(!mqtt_ready())
return -1;
printf("sending unsubscribe\n");
mqtt_state.outbound_message = mqtt_msg_unsubscribe(&mqtt_state.mqtt_connection, topic,
&mqtt_state.pending_msg_id);
mqtt_flags &= ~MQTT_FLAG_READY;
mqtt_state.pending_msg_type = MQTT_MSG_TYPE_UNSUBSCRIBE;
tcpip_poll_tcp(mqtt_state.tcp_connection);
return 0;
}
// Publish the specified message
int mqtt_publish_with_length(const char* topic, const char* data, int data_length, int qos, int retain)
{
if(!mqtt_ready())
return -1;
printf("mqtt: sending publish...\n");
mqtt_state.outbound_message = mqtt_msg_publish(&mqtt_state.mqtt_connection,
topic, data, data_length,
qos, retain,
&mqtt_state.pending_msg_id);
mqtt_flags &= ~MQTT_FLAG_READY;
mqtt_state.pending_msg_type = MQTT_MSG_TYPE_PUBLISH;
tcpip_poll_tcp(mqtt_state.tcp_connection);
return 0;
}
/*---------------------------------------------------------------------------*/
static void
state_machine(void)
{
switch(state) {
case MQTT_CLIENT_STATE_INIT:
/* If we have just been configured register MQTT connection */
mqtt_register(&conn, &mqtt_client_process, client_id, mqtt_event,
MQTT_CLIENT_MAX_SEGMENT_SIZE);
/*
* Authentication: provide user name and password
*/
if(strlen(conf->auth_token) > 0) {
mqtt_set_username_password(&conn, "use-token-auth",
conf->auth_token);
}
/* _register() will set auto_reconnect. We don't want that. */
conn.auto_reconnect = 0;
connect_attempt = 1;
/*
* Wipe out the default route so we'll republish it every time we switch to
* a new broker
*/
memset(&def_route, 0, sizeof(def_route));
state = MQTT_CLIENT_STATE_REGISTERED;
DBG("Init\n");
/* Continue */
case MQTT_CLIENT_STATE_REGISTERED:
if(uip_ds6_get_global(ADDR_PREFERRED) != NULL) {
/* Registered and with a public IP. Connect */
DBG("Registered. Connect attempt %u\n", connect_attempt);
ping_parent();
connect_to_broker();
}
etimer_set(&publish_periodic_timer, CC26XX_WEB_DEMO_NET_CONNECT_PERIODIC);
return;
break;
case MQTT_CLIENT_STATE_CONNECTING:
leds_on(CC26XX_WEB_DEMO_STATUS_LED);
ctimer_set(&ct, CONNECTING_LED_DURATION, publish_led_off, NULL);
/* Not connected yet. Wait */
DBG("Connecting (%u)\n", connect_attempt);
break;
case MQTT_CLIENT_STATE_CONNECTED:
/* Don't subscribe unless we are a registered device
if(strncasecmp(conf->org_id, QUICKSTART, strlen(conf->org_id)) == 0) {
DBG("Using 'quickstart': Skipping subscribe\n");
state = MQTT_CLIENT_STATE_PUBLISHING;
}*/
/* Continue */
case MQTT_CLIENT_STATE_PUBLISHING:
/* If the timer expired, the connection is stable. */
if(timer_expired(&connection_life)) {
/*
* Intentionally using 0 here instead of 1: We want RECONNECT_ATTEMPTS
* attempts if we disconnect after a successful connect
*/
connect_attempt = 0;
}
if(mqtt_ready(&conn) && conn.out_buffer_sent) {
/* Connected. Publish */
if(state == MQTT_CLIENT_STATE_CONNECTED) {
subscribe();
state = MQTT_CLIENT_STATE_PUBLISHING;
} else {
leds_on(CC26XX_WEB_DEMO_STATUS_LED);
ctimer_set(&ct, PUBLISH_LED_ON_DURATION, publish_led_off, NULL);
publish();
}
etimer_set(&publish_periodic_timer, conf->pub_interval);
DBG("Publishing\n");
/* Return here so we don't end up rescheduling the timer */
return;
} else {
/*
* Our publish timer fired, but some MQTT packet is already in flight
* (either not sent at all, or sent but not fully ACKd).
*
* This can mean that we have lost connectivity to our broker or that
* simply there is some network delay. In both cases, we refuse to
* trigger a new message and we wait for TCP to either ACK the entire
* packet after retries, or to timeout and notify us.
*/
DBG("Publishing... (MQTT state=%d, q=%u)\n", conn.state,
conn.out_queue_full);
}
break;
case MQTT_CLIENT_STATE_DISCONNECTED:
DBG("Disconnected\n");
if(connect_attempt < RECONNECT_ATTEMPTS ||
RECONNECT_ATTEMPTS == RETRY_FOREVER) {
/* Disconnect and backoff */
clock_time_t interval;
mqtt_disconnect(&conn);
connect_attempt++;
interval = connect_attempt < 3 ? RECONNECT_INTERVAL << connect_attempt :
RECONNECT_INTERVAL << 3;
DBG("Disconnected. Attempt %u in %lu ticks\n", connect_attempt, interval);
etimer_set(&publish_periodic_timer, interval);
state = MQTT_CLIENT_STATE_REGISTERED;
return;
} else {
/* Max reconnect attempts reached. Enter error state */
state = MQTT_CLIENT_STATE_ERROR;
DBG("Aborting connection after %u attempts\n", connect_attempt - 1);
}
break;
case MQTT_CLIENT_STATE_NEWCONFIG:
/* Only update config after we have disconnected */
if(conn.state == MQTT_CONN_STATE_NOT_CONNECTED) {
update_config();
DBG("New config\n");
/* update_config() scheduled next pass. Return */
return;
}
break;
case MQTT_CLIENT_STATE_CONFIG_ERROR:
/* Idle away. The only way out is a new config */
printf("Bad configuration.\n");
return;
case MQTT_CLIENT_STATE_ERROR:
default:
leds_on(CC26XX_WEB_DEMO_STATUS_LED);
/*
* 'default' should never happen.
*
* If we enter here it's because of some error. Stop timers. The only thing
* that can bring us out is a new config event
*/
printf("Default case: State=0x%02x\n", state);
return;
}
/* If we didn't return so far, reschedule ourselves */
etimer_set(&publish_periodic_timer, STATE_MACHINE_PERIODIC);
}
