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nes-proj/examples/platform-specific/cc26x0-cc13x0/cc26x0-web-demo/mqtt-client.c

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/*
* Copyright (c) 2014, Texas Instruments Incorporated - http://www.ti.com/
* 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.
*/
/**
* \addtogroup cc26x0-web-demo
* @{
*
* \file
* MQTT/IBM cloud service client for the CC26XX web demo.
*/
/*---------------------------------------------------------------------------*/
#include "contiki.h"
#include "net/routing/routing.h"
#include "mqtt.h"
#include "net/ipv6/uip.h"
#include "net/ipv6/uip-icmp6.h"
#include "sys/etimer.h"
#include "sys/ctimer.h"
#include "lib/sensors.h"
#include "dev/button-hal.h"
#include "board-peripherals.h"
#include "cc26x0-web-demo.h"
#include "dev/leds.h"
#include "mqtt-client.h"
#include "httpd-simple.h"
#include <string.h>
#include <strings.h>
/*---------------------------------------------------------------------------*/
/*
* IBM server: messaging.quickstart.internetofthings.ibmcloud.com
* (184.172.124.189) mapped in an NAT64 (prefix 64:ff9b::/96) IPv6 address
* Note: If not able to connect; lookup the IP address again as it may change.
*
* If the node has a broker IP setting saved on flash, this value here will
* get ignored
*/
static const char *broker_ip = "0064:ff9b:0000:0000:0000:0000:b8ac:7cbd";
/*---------------------------------------------------------------------------*/
/*
* 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 >> 3)
/* 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 5
#define CONNECTION_STABLE_TIME (CLOCK_SECOND * 5)
#define NEW_CONFIG_WAIT_INTERVAL (CLOCK_SECOND * 20)
static struct timer connection_life;
static uint8_t connect_attempt;
/*---------------------------------------------------------------------------*/
/* Various states */
static uint8_t state;
#define MQTT_CLIENT_STATE_INIT 0
#define MQTT_CLIENT_STATE_REGISTERED 1
#define MQTT_CLIENT_STATE_CONNECTING 2
#define MQTT_CLIENT_STATE_CONNECTED 3
#define MQTT_CLIENT_STATE_PUBLISHING 4
#define MQTT_CLIENT_STATE_DISCONNECTED 5
#define MQTT_CLIENT_STATE_NEWCONFIG 6
#define MQTT_CLIENT_STATE_CONFIG_ERROR 0xFE
#define MQTT_CLIENT_STATE_ERROR 0xFF
/*---------------------------------------------------------------------------*/
/* Maximum TCP segment size for outgoing segments of our socket */
#define MQTT_CLIENT_MAX_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;
/*---------------------------------------------------------------------------*/
static uip_ip6addr_t def_route;
/*---------------------------------------------------------------------------*/
/* Parent RSSI functionality */
extern int def_rt_rssi;
/*---------------------------------------------------------------------------*/
const static cc26xx_web_demo_sensor_reading_t *reading;
/*---------------------------------------------------------------------------*/
mqtt_client_config_t *conf;
/*---------------------------------------------------------------------------*/
PROCESS(mqtt_client_process, "CC26XX MQTT Client");
/*---------------------------------------------------------------------------*/
static void
publish_led_off(void *d)
{
leds_off(CC26XX_WEB_DEMO_STATUS_LED);
}
/*---------------------------------------------------------------------------*/
static void
new_net_config(void)
{
/*
* We got a new configuration over the net.
*
* Disconnect from the current broker and stop the periodic timer.
*
* When the source of the new configuration is done, we will get notified
* via an event.
*/
if(state == MQTT_CLIENT_STATE_NEWCONFIG) {
return;
}
state = MQTT_CLIENT_STATE_NEWCONFIG;
etimer_stop(&publish_periodic_timer);
mqtt_disconnect(&conn);
}
/*---------------------------------------------------------------------------*/
static int
org_id_post_handler(char *key, int key_len, char *val, int val_len)
{
int rv = HTTPD_SIMPLE_POST_HANDLER_UNKNOWN;
if(key_len != strlen("org_id") ||
strncasecmp(key, "org_id", strlen("org_id")) != 0) {
/* Not ours */
return HTTPD_SIMPLE_POST_HANDLER_UNKNOWN;
}
if(val_len > MQTT_CLIENT_CONFIG_ORG_ID_LEN) {
/* Ours but bad value */
rv = HTTPD_SIMPLE_POST_HANDLER_ERROR;
} else {
memset(conf->org_id, 0, MQTT_CLIENT_CONFIG_ORG_ID_LEN);
memcpy(conf->org_id, val, val_len);
rv = HTTPD_SIMPLE_POST_HANDLER_OK;
}
new_net_config();
return rv;
}
/*---------------------------------------------------------------------------*/
static int
type_id_post_handler(char *key, int key_len, char *val, int val_len)
{
int rv = HTTPD_SIMPLE_POST_HANDLER_UNKNOWN;
if(key_len != strlen("type_id") ||
strncasecmp(key, "type_id", strlen("type_id")) != 0) {
/* Not ours */
return HTTPD_SIMPLE_POST_HANDLER_UNKNOWN;
}
if(val_len > MQTT_CLIENT_CONFIG_TYPE_ID_LEN) {
/* Ours but bad value */
rv = HTTPD_SIMPLE_POST_HANDLER_ERROR;
} else {
memset(conf->type_id, 0, MQTT_CLIENT_CONFIG_TYPE_ID_LEN);
memcpy(conf->type_id, val, val_len);
rv = HTTPD_SIMPLE_POST_HANDLER_OK;
}
new_net_config();
return rv;
}
/*---------------------------------------------------------------------------*/
static int
event_type_id_post_handler(char *key, int key_len, char *val, int val_len)
{
int rv = HTTPD_SIMPLE_POST_HANDLER_UNKNOWN;
if(key_len != strlen("event_type_id") ||
strncasecmp(key, "event_type_id", strlen("event_type_id")) != 0) {
/* Not ours */
return HTTPD_SIMPLE_POST_HANDLER_UNKNOWN;
}
if(val_len > MQTT_CLIENT_CONFIG_EVENT_TYPE_ID_LEN) {
/* Ours but bad value */
rv = HTTPD_SIMPLE_POST_HANDLER_ERROR;
} else {
memset(conf->event_type_id, 0, MQTT_CLIENT_CONFIG_EVENT_TYPE_ID_LEN);
memcpy(conf->event_type_id, val, val_len);
rv = HTTPD_SIMPLE_POST_HANDLER_OK;
}
new_net_config();
return rv;
}
/*---------------------------------------------------------------------------*/
static int
cmd_type_post_handler(char *key, int key_len, char *val, int val_len)
{
int rv = HTTPD_SIMPLE_POST_HANDLER_UNKNOWN;
if(key_len != strlen("cmd_type") ||
strncasecmp(key, "cmd_type", strlen("cmd_type")) != 0) {
/* Not ours */
return HTTPD_SIMPLE_POST_HANDLER_UNKNOWN;
}
if(val_len > MQTT_CLIENT_CONFIG_CMD_TYPE_LEN) {
/* Ours but bad value */
rv = HTTPD_SIMPLE_POST_HANDLER_ERROR;
} else {
memset(conf->cmd_type, 0, MQTT_CLIENT_CONFIG_CMD_TYPE_LEN);
memcpy(conf->cmd_type, val, val_len);
rv = HTTPD_SIMPLE_POST_HANDLER_OK;
}
new_net_config();
return rv;
}
/*---------------------------------------------------------------------------*/
static int
auth_token_post_handler(char *key, int key_len, char *val, int val_len)
{
int rv = HTTPD_SIMPLE_POST_HANDLER_UNKNOWN;
if(key_len != strlen("auth_token") ||
strncasecmp(key, "auth_token", strlen("auth_token")) != 0) {
/* Not ours */
return HTTPD_SIMPLE_POST_HANDLER_UNKNOWN;
}
if(val_len > MQTT_CLIENT_CONFIG_AUTH_TOKEN_LEN) {
/* Ours but bad value */
rv = HTTPD_SIMPLE_POST_HANDLER_ERROR;
} else {
memset(conf->auth_token, 0, MQTT_CLIENT_CONFIG_AUTH_TOKEN_LEN);
memcpy(conf->auth_token, val, val_len);
rv = HTTPD_SIMPLE_POST_HANDLER_OK;
}
new_net_config();
return rv;
}
/*---------------------------------------------------------------------------*/
static int
interval_post_handler(char *key, int key_len, char *val, int val_len)
{
int rv = 0;
if(key_len != strlen("interval") ||
strncasecmp(key, "interval", strlen("interval")) != 0) {
/* Not ours */
return HTTPD_SIMPLE_POST_HANDLER_UNKNOWN;
}
rv = atoi(val);
if(rv < MQTT_CLIENT_PUBLISH_INTERVAL_MIN ||
rv > MQTT_CLIENT_PUBLISH_INTERVAL_MAX) {
return HTTPD_SIMPLE_POST_HANDLER_ERROR;
}
conf->pub_interval = rv * CLOCK_SECOND;
return HTTPD_SIMPLE_POST_HANDLER_OK;
}
/*---------------------------------------------------------------------------*/
static int
port_post_handler(char *key, int key_len, char *val, int val_len)
{
int rv = 0;
if(key_len != strlen("broker_port") ||
strncasecmp(key, "broker_port", strlen("broker_port")) != 0) {
/* Not ours */
return HTTPD_SIMPLE_POST_HANDLER_UNKNOWN;
}
rv = atoi(val);
if(rv <= 65535 && rv > 0) {
conf->broker_port = rv;
} else {
return HTTPD_SIMPLE_POST_HANDLER_ERROR;
}
new_net_config();
return HTTPD_SIMPLE_POST_HANDLER_OK;
}
/*---------------------------------------------------------------------------*/
static int
ip_addr_post_handler(char *key, int key_len, char *val, int val_len)
{
int rv = HTTPD_SIMPLE_POST_HANDLER_UNKNOWN;
if(key_len != strlen("broker_ip") ||
strncasecmp(key, "broker_ip", strlen("broker_ip")) != 0) {
/* Not ours */
return HTTPD_SIMPLE_POST_HANDLER_UNKNOWN;
}
if(val_len > MQTT_CLIENT_CONFIG_IP_ADDR_STR_LEN) {
/* Ours but bad value */
rv = HTTPD_SIMPLE_POST_HANDLER_ERROR;
} else {
memset(conf->broker_ip, 0, MQTT_CLIENT_CONFIG_IP_ADDR_STR_LEN);
memcpy(conf->broker_ip, val, val_len);
rv = HTTPD_SIMPLE_POST_HANDLER_OK;
}
new_net_config();
return rv;
}
/*---------------------------------------------------------------------------*/
static int
reconnect_post_handler(char *key, int key_len, char *val, int val_len)
{
if(key_len != strlen("reconnect") ||
strncasecmp(key, "reconnect", strlen("reconnect")) != 0) {
/* Not ours */
return HTTPD_SIMPLE_POST_HANDLER_UNKNOWN;
}
new_net_config();
return HTTPD_SIMPLE_POST_HANDLER_OK;
}
/*---------------------------------------------------------------------------*/
HTTPD_SIMPLE_POST_HANDLER(org_id, org_id_post_handler);
HTTPD_SIMPLE_POST_HANDLER(type_id, type_id_post_handler);
HTTPD_SIMPLE_POST_HANDLER(event_type_id, event_type_id_post_handler);
HTTPD_SIMPLE_POST_HANDLER(cmd_type, cmd_type_post_handler);
HTTPD_SIMPLE_POST_HANDLER(auth_token, auth_token_post_handler);
HTTPD_SIMPLE_POST_HANDLER(ip_addr, ip_addr_post_handler);
HTTPD_SIMPLE_POST_HANDLER(port, port_post_handler);
HTTPD_SIMPLE_POST_HANDLER(interval, interval_post_handler);
HTTPD_SIMPLE_POST_HANDLER(reconnect, reconnect_post_handler);
/*---------------------------------------------------------------------------*/
static void
pub_handler(const char *topic, uint16_t topic_len, const uint8_t *chunk,
uint16_t chunk_len)
{
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) {
printf("Incorrect topic or chunk len. Ignored\n");
return;
}
/* If the format != json, ignore */
if(strncmp(&topic[topic_len - 4], "json", 4) != 0) {
printf("Incorrect format\n");
}
if(strncmp(&topic[10], "leds", 4) == 0) {
if(chunk[0] == '1') {
leds_on(LEDS_RED);
} else if(chunk[0] == '0') {
leds_off(LEDS_RED);
}
return;
}
#if BOARD_SENSORTAG
if(strncmp(&topic[10], "buzz", 4) == 0) {
if(chunk[0] == '1') {
buzzer_start(1000);
} else if(chunk[0] == '0') {
buzzer_stop();
}
return;
}
#endif
}
/*---------------------------------------------------------------------------*/
static void
mqtt_event(struct mqtt_connection *m, mqtt_event_t event, void *data)
{
switch(event) {
case MQTT_EVENT_CONNECTED: {
DBG("APP - Application has a MQTT connection\n");
timer_set(&connection_life, CONNECTION_STABLE_TIME);
state = MQTT_CLIENT_STATE_CONNECTED;
break;
}
case MQTT_EVENT_DISCONNECTED: {
DBG("APP - MQTT Disconnect. Reason %u\n", *((mqtt_event_t *)data));
/* Do nothing if the disconnect was the result of an incoming config */
if(state != MQTT_CLIENT_STATE_NEWCONFIG) {
state = MQTT_CLIENT_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;
DBG("APP - Application received a publish on topic '%s'. Payload "
"size is %i bytes. Content:\n\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: {
DBG("APP - Application is subscribed to topic successfully\n");
break;
}
case MQTT_EVENT_UNSUBACK: {
DBG("APP - Application is unsubscribed to topic successfully\n");
break;
}
case MQTT_EVENT_PUBACK: {
DBG("APP - Publishing complete.\n");
break;
}
default:
DBG("APP - 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) {
printf("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) {
printf("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) {
printf("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 = MQTT_CLIENT_STATE_CONFIG_ERROR;
return;
}
if(construct_sub_topic() == 0) {
/* Fatal error. Topic larger than the buffer */
state = MQTT_CLIENT_STATE_CONFIG_ERROR;
return;
}
if(construct_pub_topic() == 0) {
/* Fatal error. Topic larger than the buffer */
state = MQTT_CLIENT_STATE_CONFIG_ERROR;
return;
}
/* Reset the counter */
seq_nr_value = 0;
state = MQTT_CLIENT_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, CC26XX_WEB_DEMO_DEFAULT_ORG_ID, 11);
memcpy(conf->type_id, CC26XX_WEB_DEMO_DEFAULT_TYPE_ID, 7);
memcpy(conf->event_type_id, CC26XX_WEB_DEMO_DEFAULT_EVENT_TYPE_ID, 7);
memcpy(conf->broker_ip, broker_ip, strlen(broker_ip));
memcpy(conf->cmd_type, CC26XX_WEB_DEMO_DEFAULT_SUBSCRIBE_CMD_TYPE, 1);
conf->broker_port = CC26XX_WEB_DEMO_DEFAULT_BROKER_PORT;
conf->pub_interval = CC26XX_WEB_DEMO_DEFAULT_PUBLISH_INTERVAL;
return 1;
}
/*---------------------------------------------------------------------------*/
static void
register_http_post_handlers(void)
{
httpd_simple_register_post_handler(&org_id_handler);
httpd_simple_register_post_handler(&type_id_handler);
httpd_simple_register_post_handler(&event_type_id_handler);
httpd_simple_register_post_handler(&cmd_type_handler);
httpd_simple_register_post_handler(&auth_token_handler);
httpd_simple_register_post_handler(&interval_handler);
httpd_simple_register_post_handler(&port_handler);
httpd_simple_register_post_handler(&ip_addr_handler);
httpd_simple_register_post_handler(&reconnect_handler);
}
/*---------------------------------------------------------------------------*/
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);
DBG("APP - Subscribing!\n");
if(status == MQTT_STATUS_OUT_QUEUE_FULL) {
DBG("APP - 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;
char def_rt_str[64];
seq_nr_value++;
buf_ptr = app_buffer;
len = snprintf(buf_ptr, remaining,
"{"
"\"d\":{"
"\"myName\":\"%s\","
"\"Seq #\":%d,"
"\"Uptime (sec)\":%lu",
BOARD_STRING, seq_nr_value, clock_seconds());
if(len < 0 || len >= remaining) {
printf("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));
cc26xx_web_demo_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) {
printf("Buffer too short. Have %d, need %d + \\0\n", remaining, len);
return;
}
remaining -= len;
buf_ptr += len;
memcpy(&def_route, uip_ds6_defrt_choose(), sizeof(uip_ip6addr_t));
for(reading = cc26xx_web_demo_sensor_first();
reading != NULL; reading = reading->next) {
if(reading->publish && reading->raw != CC26XX_SENSOR_READING_ERROR) {
len = snprintf(buf_ptr, remaining,
",\"%s (%s)\":%s", reading->descr, reading->units,
reading->converted);
if(len < 0 || len >= remaining) {
printf("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) {
printf("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);
DBG("APP - Publish!\n");
}
/*---------------------------------------------------------------------------*/
static void
connect_to_broker(void)
{
/* Connect to MQTT server */
mqtt_status_t conn_attempt_result = mqtt_connect(&conn, conf->broker_ip,
conf->broker_port,
conf->pub_interval * 3);
if(conn_attempt_result == MQTT_STATUS_OK) {
state = MQTT_CLIENT_STATE_CONNECTING;
} else {
state = MQTT_CLIENT_STATE_CONFIG_ERROR;
}
}
/*---------------------------------------------------------------------------*/
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);
/*
* 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) {
printf("User name set, but empty auth token\n");
state = MQTT_CLIENT_STATE_ERROR;
break;
} else {
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);
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 or in the case of an error */
if(conn.state == MQTT_CONN_STATE_NOT_CONNECTED || conn.state == MQTT_CONN_STATE_ERROR) {
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);
}
/*---------------------------------------------------------------------------*/
PROCESS_THREAD(mqtt_client_process, ev, data)
{
PROCESS_BEGIN();
printf("CC26XX MQTT Client Process\n");
conf = &cc26xx_web_demo_config.mqtt_config;
if(init_config() != 1) {
PROCESS_EXIT();
}
register_http_post_handlers();
update_config();
/* Main loop */
while(1) {
PROCESS_YIELD();
if(ev == button_hal_release_event) {
button_hal_button_t *btn = (button_hal_button_t *)data;
if(btn->unique_id == CC26XX_WEB_DEMO_MQTT_PUBLISH_TRIGGER) {
if(state == MQTT_CLIENT_STATE_ERROR) {
connect_attempt = 1;
state = MQTT_CLIENT_STATE_REGISTERED;
}
}
}
if(ev == httpd_simple_event_new_config) {
/*
* Schedule next pass in a while. When HTTPD sends us this event, it is
* also in the process of sending the config page. Wait a little before
* reconnecting, so as to not cause congestion.
*/
etimer_set(&publish_periodic_timer, NEW_CONFIG_WAIT_INTERVAL);
}
if((ev == PROCESS_EVENT_TIMER && data == &publish_periodic_timer) ||
ev == PROCESS_EVENT_POLL ||
ev == cc26xx_web_demo_publish_event ||
(ev == button_hal_release_event &&
((button_hal_button_t *)data)->unique_id ==
CC26XX_WEB_DEMO_MQTT_PUBLISH_TRIGGER)) {
state_machine();
}
if(ev == cc26xx_web_demo_load_config_defaults) {
init_config();
etimer_set(&publish_periodic_timer, NEW_CONFIG_WAIT_INTERVAL);
}
}
PROCESS_END();
}
/*---------------------------------------------------------------------------*/
/**
* @}
*/
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