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nes-proj/examples/mqtt-client/mqtt-client.c

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/*
* Copyright (c) 2014, Texas Instruments Incorporated - http://www.ti.com/
* Copyright (c) 2017, George Oikonomou - http://www.spd.gr
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*---------------------------------------------------------------------------*/
#include "contiki.h"
#include "net/routing/routing.h"
#include "mqtt.h"
#include "net/ipv6/uip.h"
#include "net/ipv6/uip-icmp6.h"
#include "net/ipv6/sicslowpan.h"
#include "sys/etimer.h"
#include "sys/ctimer.h"
#include "lib/sensors.h"
#include "dev/button-hal.h"
#include "dev/leds.h"
#include "os/sys/log.h"
#include "mqtt-client.h"
#include <string.h>
#include <strings.h>
/*---------------------------------------------------------------------------*/
#define LOG_MODULE "mqtt-client"
#ifdef MQTT_CLIENT_CONF_LOG_LEVEL
#define LOG_LEVEL MQTT_CLIENT_CONF_LOG_LEVEL
#else
#define LOG_LEVEL LOG_LEVEL_NONE
#endif
/*---------------------------------------------------------------------------*/
/* Controls whether the example will work in IBM Watson IoT platform mode */
#ifdef MQTT_CLIENT_CONF_WITH_IBM_WATSON
#define MQTT_CLIENT_WITH_IBM_WATSON MQTT_CLIENT_CONF_WITH_IBM_WATSON
#else
#define MQTT_CLIENT_WITH_IBM_WATSON 0
#endif
/*---------------------------------------------------------------------------*/
/* MQTT broker address. Ignored in Watson mode */
#ifdef MQTT_CLIENT_CONF_BROKER_IP_ADDR
#define MQTT_CLIENT_BROKER_IP_ADDR MQTT_CLIENT_CONF_BROKER_IP_ADDR
#else
#define MQTT_CLIENT_BROKER_IP_ADDR "fd00::1"
#endif
/*---------------------------------------------------------------------------*/
/*
* MQTT Org ID.
*
* If it equals "quickstart", the client will connect without authentication.
* In all other cases, the client will connect with authentication mode.
*
* In Watson mode, the username will be "use-token-auth". In non-Watson mode
* the username will be MQTT_CLIENT_USERNAME.
*
* In all cases, the password will be MQTT_CLIENT_AUTH_TOKEN.
*/
#ifdef MQTT_CLIENT_CONF_ORG_ID
#define MQTT_CLIENT_ORG_ID MQTT_CLIENT_CONF_ORG_ID
#else
#define MQTT_CLIENT_ORG_ID "quickstart"
#endif
/*---------------------------------------------------------------------------*/
/* MQTT token */
#ifdef MQTT_CLIENT_CONF_AUTH_TOKEN
#define MQTT_CLIENT_AUTH_TOKEN MQTT_CLIENT_CONF_AUTH_TOKEN
#else
#define MQTT_CLIENT_AUTH_TOKEN "AUTHTOKEN"
#endif
/*---------------------------------------------------------------------------*/
#if MQTT_CLIENT_WITH_IBM_WATSON
/* With IBM Watson support */
static const char *broker_ip = "0064:ff9b:0000:0000:0000:0000:b8ac:7cbd";
#define MQTT_CLIENT_USERNAME "use-token-auth"
#else /* MQTT_CLIENT_WITH_IBM_WATSON */
/* Without IBM Watson support. To be used with other brokers, e.g. Mosquitto */
static const char *broker_ip = MQTT_CLIENT_BROKER_IP_ADDR;
#ifdef MQTT_CLIENT_CONF_USERNAME
#define MQTT_CLIENT_USERNAME MQTT_CLIENT_CONF_USERNAME
#else
#define MQTT_CLIENT_USERNAME "use-token-auth"
#endif
#endif /* MQTT_CLIENT_WITH_IBM_WATSON */
/*---------------------------------------------------------------------------*/
#ifdef MQTT_CLIENT_CONF_STATUS_LED
#define MQTT_CLIENT_STATUS_LED MQTT_CLIENT_CONF_STATUS_LED
#else
#define MQTT_CLIENT_STATUS_LED LEDS_GREEN
#endif
/*---------------------------------------------------------------------------*/
#ifdef MQTT_CLIENT_CONF_WITH_EXTENSIONS
#define MQTT_CLIENT_WITH_EXTENSIONS MQTT_CLIENT_CONF_WITH_EXTENSIONS
#else
#define MQTT_CLIENT_WITH_EXTENSIONS 0
#endif
/*---------------------------------------------------------------------------*/
/*
* A timeout used when waiting for something to happen (e.g. to connect or to
* disconnect)
*/
#define STATE_MACHINE_PERIODIC (CLOCK_SECOND >> 1)
/*---------------------------------------------------------------------------*/
/* Provide visible feedback via LEDS during various states */
/* When connecting to broker */
#define CONNECTING_LED_DURATION (CLOCK_SECOND >> 2)
/* Each time we try to publish */
#define PUBLISH_LED_ON_DURATION (CLOCK_SECOND)
/*---------------------------------------------------------------------------*/
/* Connections and reconnections */
#define RETRY_FOREVER 0xFF
#define RECONNECT_INTERVAL (CLOCK_SECOND * 2)
/*
* Number of times to try reconnecting to the broker.
* Can be a limited number (e.g. 3, 10 etc) or can be set to RETRY_FOREVER
*/
#define RECONNECT_ATTEMPTS RETRY_FOREVER
#define CONNECTION_STABLE_TIME (CLOCK_SECOND * 5)
static struct timer connection_life;
static uint8_t connect_attempt;
/*---------------------------------------------------------------------------*/
/* Various states */
static uint8_t state;
#define STATE_INIT 0
#define STATE_REGISTERED 1
#define STATE_CONNECTING 2
#define STATE_CONNECTED 3
#define STATE_PUBLISHING 4
#define STATE_DISCONNECTED 5
#define STATE_NEWCONFIG 6
#define STATE_CONFIG_ERROR 0xFE
#define STATE_ERROR 0xFF
/*---------------------------------------------------------------------------*/
#define CONFIG_ORG_ID_LEN 32
#define CONFIG_TYPE_ID_LEN 32
#define CONFIG_AUTH_TOKEN_LEN 32
#define CONFIG_EVENT_TYPE_ID_LEN 32
#define CONFIG_CMD_TYPE_LEN 8
#define CONFIG_IP_ADDR_STR_LEN 64
/*---------------------------------------------------------------------------*/
/* A timeout used when waiting to connect to a network */
#define NET_CONNECT_PERIODIC (CLOCK_SECOND >> 2)
#define NO_NET_LED_DURATION (NET_CONNECT_PERIODIC >> 1)
/*---------------------------------------------------------------------------*/
/* Default configuration values */
#define DEFAULT_TYPE_ID "mqtt-client"
#define DEFAULT_EVENT_TYPE_ID "status"
#define DEFAULT_SUBSCRIBE_CMD_TYPE "+"
#define DEFAULT_BROKER_PORT 1883
#define DEFAULT_PUBLISH_INTERVAL (30 * CLOCK_SECOND)
#define DEFAULT_KEEP_ALIVE_TIMER 60
#define DEFAULT_RSSI_MEAS_INTERVAL (CLOCK_SECOND * 30)
/*---------------------------------------------------------------------------*/
#define MQTT_CLIENT_SENSOR_NONE (void *)0xFFFFFFFF
/*---------------------------------------------------------------------------*/
/* Payload length of ICMPv6 echo requests used to measure RSSI with def rt */
#define ECHO_REQ_PAYLOAD_LEN 20
/*---------------------------------------------------------------------------*/
PROCESS_NAME(mqtt_client_process);
AUTOSTART_PROCESSES(&mqtt_client_process);
/*---------------------------------------------------------------------------*/
/**
* \brief Data structure declaration for the MQTT client configuration
*/
typedef struct mqtt_client_config {
char org_id[CONFIG_ORG_ID_LEN];
char type_id[CONFIG_TYPE_ID_LEN];
char auth_token[CONFIG_AUTH_TOKEN_LEN];
char event_type_id[CONFIG_EVENT_TYPE_ID_LEN];
char broker_ip[CONFIG_IP_ADDR_STR_LEN];
char cmd_type[CONFIG_CMD_TYPE_LEN];
clock_time_t pub_interval;
int def_rt_ping_interval;
uint16_t broker_port;
} mqtt_client_config_t;
/*---------------------------------------------------------------------------*/
/* Maximum TCP segment size for outgoing segments of our socket */
#define MAX_TCP_SEGMENT_SIZE 32
/*---------------------------------------------------------------------------*/
/*
* Buffers for Client ID and Topic.
* Make sure they are large enough to hold the entire respective string
*
* d:quickstart:status:EUI64 is 32 bytes long
* iot-2/evt/status/fmt/json is 25 bytes
* We also need space for the null termination
*/
#define BUFFER_SIZE 64
static char client_id[BUFFER_SIZE];
static char pub_topic[BUFFER_SIZE];
static char sub_topic[BUFFER_SIZE];
/*---------------------------------------------------------------------------*/
/*
* The main MQTT buffers.
* We will need to increase if we start publishing more data.
*/
#define APP_BUFFER_SIZE 512
static struct mqtt_connection conn;
static char app_buffer[APP_BUFFER_SIZE];
/*---------------------------------------------------------------------------*/
#define QUICKSTART "quickstart"
/*---------------------------------------------------------------------------*/
static struct mqtt_message *msg_ptr = 0;
static struct etimer publish_periodic_timer;
static struct ctimer ct;
static char *buf_ptr;
static uint16_t seq_nr_value = 0;
/*---------------------------------------------------------------------------*/
/* Parent RSSI functionality */
static struct uip_icmp6_echo_reply_notification echo_reply_notification;
static struct etimer echo_request_timer;
static int def_rt_rssi = 0;
/*---------------------------------------------------------------------------*/
static mqtt_client_config_t conf;
/*---------------------------------------------------------------------------*/
#if MQTT_CLIENT_WITH_EXTENSIONS
extern const mqtt_client_extension_t *mqtt_client_extensions[];
extern const uint8_t mqtt_client_extension_count;
#else
static const mqtt_client_extension_t *mqtt_client_extensions[] = { NULL };
static const uint8_t mqtt_client_extension_count = 0;
#endif
/*---------------------------------------------------------------------------*/
PROCESS(mqtt_client_process, "MQTT Client");
/*---------------------------------------------------------------------------*/
static int
ipaddr_sprintf(char *buf, uint8_t buf_len, const uip_ipaddr_t *addr)
{
uint16_t a;
uint8_t len = 0;
int i, f;
for(i = 0, f = 0; i < sizeof(uip_ipaddr_t); i += 2) {
a = (addr->u8[i] << 8) + addr->u8[i + 1];
if(a == 0 && f >= 0) {
if(f++ == 0) {
len += snprintf(&buf[len], buf_len - len, "::");
}
} else {
if(f > 0) {
f = -1;
} else if(i > 0) {
len += snprintf(&buf[len], buf_len - len, ":");
}
len += snprintf(&buf[len], buf_len - len, "%x", a);
}
}
return len;
}
/*---------------------------------------------------------------------------*/
static void
echo_reply_handler(uip_ipaddr_t *source, uint8_t ttl, uint8_t *data,
uint16_t datalen)
{
if(uip_ip6addr_cmp(source, uip_ds6_defrt_choose())) {
def_rt_rssi = sicslowpan_get_last_rssi();
}
}
/*---------------------------------------------------------------------------*/
static void
publish_led_off(void *d)
{
leds_off(MQTT_CLIENT_STATUS_LED);
}
/*---------------------------------------------------------------------------*/
static void
pub_handler(const char *topic, uint16_t topic_len, const uint8_t *chunk,
uint16_t chunk_len)
{
LOG_DBG("Pub Handler: topic='%s' (len=%u), chunk_len=%u\n", topic,
topic_len, chunk_len);
/* If we don't like the length, ignore */
if(topic_len != 23 || chunk_len != 1) {
LOG_ERR("Incorrect topic or chunk len. Ignored\n");
return;
}
/* If the format != json, ignore */
if(strncmp(&topic[topic_len - 4], "json", 4) != 0) {
LOG_ERR("Incorrect format\n");
}
if(strncmp(&topic[10], "leds", 4) == 0) {
LOG_DBG("Received MQTT SUB\n");
if(chunk[0] == '1') {
leds_on(LEDS_RED);
} else if(chunk[0] == '0') {
leds_off(LEDS_RED);
}
return;
}
}
/*---------------------------------------------------------------------------*/
static void
mqtt_event(struct mqtt_connection *m, mqtt_event_t event, void *data)
{
switch(event) {
case MQTT_EVENT_CONNECTED: {
LOG_DBG("Application has a MQTT connection\n");
timer_set(&connection_life, CONNECTION_STABLE_TIME);
state = STATE_CONNECTED;
break;
}
case MQTT_EVENT_DISCONNECTED: {
LOG_DBG("MQTT Disconnect. Reason %u\n", *((mqtt_event_t *)data));
state = STATE_DISCONNECTED;
process_poll(&mqtt_client_process);
break;
}
case MQTT_EVENT_PUBLISH: {
msg_ptr = data;
/* Implement first_flag in publish message? */
if(msg_ptr->first_chunk) {
msg_ptr->first_chunk = 0;
LOG_DBG("Application received publish for topic '%s'. Payload "
"size is %i bytes.\n", msg_ptr->topic, msg_ptr->payload_length);
}
pub_handler(msg_ptr->topic, strlen(msg_ptr->topic),
msg_ptr->payload_chunk, msg_ptr->payload_length);
break;
}
case MQTT_EVENT_SUBACK: {
LOG_DBG("Application is subscribed to topic successfully\n");
break;
}
case MQTT_EVENT_UNSUBACK: {
LOG_DBG("Application is unsubscribed to topic successfully\n");
break;
}
case MQTT_EVENT_PUBACK: {
LOG_DBG("Publishing complete.\n");
break;
}
default:
LOG_DBG("Application got a unhandled MQTT event: %i\n", event);
break;
}
}
/*---------------------------------------------------------------------------*/
static int
construct_pub_topic(void)
{
int len = snprintf(pub_topic, BUFFER_SIZE, "iot-2/evt/%s/fmt/json",
conf.event_type_id);
/* len < 0: Error. Len >= BUFFER_SIZE: Buffer too small */
if(len < 0 || len >= BUFFER_SIZE) {
LOG_INFO("Pub Topic: %d, Buffer %d\n", len, BUFFER_SIZE);
return 0;
}
return 1;
}
/*---------------------------------------------------------------------------*/
static int
construct_sub_topic(void)
{
int len = snprintf(sub_topic, BUFFER_SIZE, "iot-2/cmd/%s/fmt/json",
conf.cmd_type);
/* len < 0: Error. Len >= BUFFER_SIZE: Buffer too small */
if(len < 0 || len >= BUFFER_SIZE) {
LOG_INFO("Sub Topic: %d, Buffer %d\n", len, BUFFER_SIZE);
return 0;
}
return 1;
}
/*---------------------------------------------------------------------------*/
static int
construct_client_id(void)
{
int len = snprintf(client_id, BUFFER_SIZE, "d:%s:%s:%02x%02x%02x%02x%02x%02x",
conf.org_id, conf.type_id,
linkaddr_node_addr.u8[0], linkaddr_node_addr.u8[1],
linkaddr_node_addr.u8[2], linkaddr_node_addr.u8[5],
linkaddr_node_addr.u8[6], linkaddr_node_addr.u8[7]);
/* len < 0: Error. Len >= BUFFER_SIZE: Buffer too small */
if(len < 0 || len >= BUFFER_SIZE) {
LOG_ERR("Client ID: %d, Buffer %d\n", len, BUFFER_SIZE);
return 0;
}
return 1;
}
/*---------------------------------------------------------------------------*/
static void
update_config(void)
{
if(construct_client_id() == 0) {
/* Fatal error. Client ID larger than the buffer */
state = STATE_CONFIG_ERROR;
return;
}
if(construct_sub_topic() == 0) {
/* Fatal error. Topic larger than the buffer */
state = STATE_CONFIG_ERROR;
return;
}
if(construct_pub_topic() == 0) {
/* Fatal error. Topic larger than the buffer */
state = STATE_CONFIG_ERROR;
return;
}
/* Reset the counter */
seq_nr_value = 0;
state = STATE_INIT;
/*
* Schedule next timer event ASAP
*
* If we entered an error state then we won't do anything when it fires.
*
* Since the error at this stage is a config error, we will only exit this
* error state if we get a new config.
*/
etimer_set(&publish_periodic_timer, 0);
return;
}
/*---------------------------------------------------------------------------*/
static int
init_config()
{
/* Populate configuration with default values */
memset(&conf, 0, sizeof(mqtt_client_config_t));
memcpy(conf.org_id, MQTT_CLIENT_ORG_ID, strlen(MQTT_CLIENT_ORG_ID));
memcpy(conf.type_id, DEFAULT_TYPE_ID, strlen(DEFAULT_TYPE_ID));
memcpy(conf.auth_token, MQTT_CLIENT_AUTH_TOKEN,
strlen(MQTT_CLIENT_AUTH_TOKEN));
memcpy(conf.event_type_id, DEFAULT_EVENT_TYPE_ID,
strlen(DEFAULT_EVENT_TYPE_ID));
memcpy(conf.broker_ip, broker_ip, strlen(broker_ip));
memcpy(conf.cmd_type, DEFAULT_SUBSCRIBE_CMD_TYPE, 1);
conf.broker_port = DEFAULT_BROKER_PORT;
conf.pub_interval = DEFAULT_PUBLISH_INTERVAL;
conf.def_rt_ping_interval = DEFAULT_RSSI_MEAS_INTERVAL;
return 1;
}
/*---------------------------------------------------------------------------*/
static void
subscribe(void)
{
/* Publish MQTT topic in IBM quickstart format */
mqtt_status_t status;
status = mqtt_subscribe(&conn, NULL, sub_topic, MQTT_QOS_LEVEL_0);
LOG_DBG("Subscribing!\n");
if(status == MQTT_STATUS_OUT_QUEUE_FULL) {
LOG_ERR("Tried to subscribe but command queue was full!\n");
}
}
/*---------------------------------------------------------------------------*/
static void
publish(void)
{
/* Publish MQTT topic in IBM quickstart format */
int len;
int remaining = APP_BUFFER_SIZE;
int i;
char def_rt_str[64];
seq_nr_value++;
buf_ptr = app_buffer;
len = snprintf(buf_ptr, remaining,
"{"
"\"d\":{"
"\"Platform\":\""CONTIKI_TARGET_STRING"\","
#ifdef CONTIKI_BOARD_STRING
"\"Board\":\""CONTIKI_BOARD_STRING"\","
#endif
"\"Seq #\":%d,"
"\"Uptime (sec)\":%lu",
seq_nr_value, clock_seconds());
if(len < 0 || len >= remaining) {
LOG_ERR("Buffer too short. Have %d, need %d + \\0\n", remaining,
len);
return;
}
remaining -= len;
buf_ptr += len;
/* Put our Default route's string representation in a buffer */
memset(def_rt_str, 0, sizeof(def_rt_str));
ipaddr_sprintf(def_rt_str, sizeof(def_rt_str), uip_ds6_defrt_choose());
len = snprintf(buf_ptr, remaining,
",\"Def Route\":\"%s\",\"RSSI (dBm)\":%d",
def_rt_str, def_rt_rssi);
if(len < 0 || len >= remaining) {
LOG_ERR("Buffer too short. Have %d, need %d + \\0\n", remaining,
len);
return;
}
remaining -= len;
buf_ptr += len;
for(i = 0; i < mqtt_client_extension_count; i++) {
len = snprintf(buf_ptr, remaining, ",%s",
mqtt_client_extensions[i]->value());
if(len < 0 || len >= remaining) {
LOG_ERR("Buffer too short. Have %d, need %d + \\0\n", remaining,
len);
return;
}
remaining -= len;
buf_ptr += len;
}
len = snprintf(buf_ptr, remaining, "}}");
if(len < 0 || len >= remaining) {
LOG_ERR("Buffer too short. Have %d, need %d + \\0\n", remaining,
len);
return;
}
mqtt_publish(&conn, NULL, pub_topic, (uint8_t *)app_buffer,
strlen(app_buffer), MQTT_QOS_LEVEL_0, MQTT_RETAIN_OFF);
LOG_DBG("Publish!\n");
}
/*---------------------------------------------------------------------------*/
static void
connect_to_broker(void)
{
/* Connect to MQTT server */
mqtt_connect(&conn, conf.broker_ip, conf.broker_port,
(conf.pub_interval * 3) / CLOCK_SECOND);
state = STATE_CONNECTING;
}
/*---------------------------------------------------------------------------*/
static void
ping_parent(void)
{
if(uip_ds6_get_global(ADDR_PREFERRED) == NULL) {
return;
}
uip_icmp6_send(uip_ds6_defrt_choose(), ICMP6_ECHO_REQUEST, 0,
ECHO_REQ_PAYLOAD_LEN);
}
/*---------------------------------------------------------------------------*/
static void
state_machine(void)
{
switch(state) {
case STATE_INIT:
/* If we have just been configured register MQTT connection */
mqtt_register(&conn, &mqtt_client_process, client_id, mqtt_event,
MAX_TCP_SEGMENT_SIZE);
/*
* If we are not using the quickstart service (thus we are an IBM
* registered device), we need to provide user name and password
*/
if(strncasecmp(conf.org_id, QUICKSTART, strlen(conf.org_id)) != 0) {
if(strlen(conf.auth_token) == 0) {
LOG_ERR("User name set, but empty auth token\n");
state = STATE_ERROR;
break;
} else {
mqtt_set_username_password(&conn, MQTT_CLIENT_USERNAME,
conf.auth_token);
}
}
/* _register() will set auto_reconnect. We don't want that. */
conn.auto_reconnect = 0;
connect_attempt = 1;
state = STATE_REGISTERED;
LOG_DBG("Init\n");
/* Continue */
case STATE_REGISTERED:
if(uip_ds6_get_global(ADDR_PREFERRED) != NULL) {
/* Registered and with a public IP. Connect */
LOG_DBG("Registered. Connect attempt %u\n", connect_attempt);
ping_parent();
connect_to_broker();
} else {
leds_on(MQTT_CLIENT_STATUS_LED);
ctimer_set(&ct, NO_NET_LED_DURATION, publish_led_off, NULL);
}
etimer_set(&publish_periodic_timer, NET_CONNECT_PERIODIC);
return;
break;
case STATE_CONNECTING:
leds_on(MQTT_CLIENT_STATUS_LED);
ctimer_set(&ct, CONNECTING_LED_DURATION, publish_led_off, NULL);
/* Not connected yet. Wait */
LOG_DBG("Connecting (%u)\n", connect_attempt);
break;
case STATE_CONNECTED:
/* Don't subscribe unless we are a registered device */
if(strncasecmp(conf.org_id, QUICKSTART, strlen(conf.org_id)) == 0) {
LOG_DBG("Using 'quickstart': Skipping subscribe\n");
state = STATE_PUBLISHING;
}
/* Continue */
case 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 == STATE_CONNECTED) {
subscribe();
state = STATE_PUBLISHING;
} else {
leds_on(MQTT_CLIENT_STATUS_LED);
ctimer_set(&ct, PUBLISH_LED_ON_DURATION, publish_led_off, NULL);
LOG_DBG("Publishing\n");
publish();
}
etimer_set(&publish_periodic_timer, conf.pub_interval);
/* 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.
*/
LOG_DBG("Publishing... (MQTT state=%d, q=%u)\n", conn.state,
conn.out_queue_full);
}
break;
case STATE_DISCONNECTED:
LOG_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;
LOG_DBG("Disconnected. Attempt %u in %lu ticks\n", connect_attempt, interval);
etimer_set(&publish_periodic_timer, interval);
state = STATE_REGISTERED;
return;
} else {
/* Max reconnect attempts reached. Enter error state */
state = STATE_ERROR;
LOG_DBG("Aborting connection after %u attempts\n", connect_attempt - 1);
}
break;
case STATE_CONFIG_ERROR:
/* Idle away. The only way out is a new config */
LOG_ERR("Bad configuration.\n");
return;
case STATE_ERROR:
default:
leds_on(MQTT_CLIENT_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
*/
LOG_ERR("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);
}
/*---------------------------------------------------------------------------*/
static void
init_extensions(void)
{
int i;
for(i = 0; i < mqtt_client_extension_count; i++) {
if(mqtt_client_extensions[i]->init) {
mqtt_client_extensions[i]->init();
}
}
}
/*---------------------------------------------------------------------------*/
PROCESS_THREAD(mqtt_client_process, ev, data)
{
PROCESS_BEGIN();
printf("MQTT Client Process\n");
if(init_config() != 1) {
PROCESS_EXIT();
}
init_extensions();
update_config();
def_rt_rssi = 0x8000000;
uip_icmp6_echo_reply_callback_add(&echo_reply_notification,
echo_reply_handler);
etimer_set(&echo_request_timer, conf.def_rt_ping_interval);
/* Main loop */
while(1) {
PROCESS_YIELD();
if(ev == button_hal_release_event &&
((button_hal_button_t *)data)->unique_id == BUTTON_HAL_ID_BUTTON_ZERO) {
if(state == STATE_ERROR) {
connect_attempt = 1;
state = STATE_REGISTERED;
}
}
if((ev == PROCESS_EVENT_TIMER && data == &publish_periodic_timer) ||
ev == PROCESS_EVENT_POLL ||
(ev == button_hal_release_event &&
((button_hal_button_t *)data)->unique_id == BUTTON_HAL_ID_BUTTON_ZERO)) {
state_machine();
}
if(ev == PROCESS_EVENT_TIMER && data == &echo_request_timer) {
ping_parent();
etimer_set(&echo_request_timer, conf.def_rt_ping_interval);
}
}
PROCESS_END();
}
/*---------------------------------------------------------------------------*/
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