mqtt_client.c

#include <esp8266.h>
#include "cgiwifi.h"
#include "config.h"
#include "mqtt.h"

#ifdef MQTTCLIENT_DBG
#define DBG_MQTTCLIENT(format, ...) os_printf(format, ## __VA_ARGS__)
#else
#define DBG_MQTTCLIENT(format, ...) do { } while(0)
#endif

MQTT_Client mqttClient;
char* statusTopicStr;
static char* onlineMsgStr;

static MqttCallback connected_cb;
static MqttCallback disconnected_cb;
static MqttCallback published_cb;
static MqttDataCallback data_cb;

void ICACHE_FLASH_ATTR
mqttConnectedCb(uint32_t *args) {
  MQTT_Client* client = (MQTT_Client*)args;
  DBG_MQTTCLIENT("MQTT Client: Connected\n");
  MQTT_Subscribe(client, "system/time", 0);
  MQTT_Publish(client, "announce/all", onlineMsgStr, 0, 0);
  if (connected_cb)
    connected_cb(args);
}

void ICACHE_FLASH_ATTR
mqttDisconnectedCb(uint32_t *args) {
//  MQTT_Client* client = (MQTT_Client*)args;
  DBG_MQTTCLIENT("MQTT Client: Disconnected\n");
  if (disconnected_cb)
    disconnected_cb(args);
}

void ICACHE_FLASH_ATTR
mqttPublishedCb(uint32_t *args) {
//  MQTT_Client* client = (MQTT_Client*)args;
  DBG_MQTTCLIENT("MQTT Client: Published\n");
  if (published_cb)
    published_cb(args);
}

void ICACHE_FLASH_ATTR
mqttDataCb(uint32_t *args, const char* topic, uint32_t topic_len, const char *data, uint32_t data_len) {
  //  MQTT_Client* client = (MQTT_Client*)args;

  char *topicBuf = (char*)os_zalloc(topic_len + 1);
  char *dataBuf = (char*)os_zalloc(data_len + 1);

  os_memcpy(topicBuf, topic, topic_len);
  topicBuf[topic_len] = 0;

  os_memcpy(dataBuf, data, data_len);
  dataBuf[data_len] = 0;

  DBG_MQTTCLIENT("MQTT Client: Received topic: %s, data: %s\n", topicBuf, dataBuf);
  os_free(topicBuf);
  os_free(dataBuf);

  if (data_cb)
    data_cb(args, topic, topic_len, data, data_len);
}

void ICACHE_FLASH_ATTR
wifiStateChangeCb(uint8_t status)
{
  if (flashConfig.mqtt_enable) {
    if (status == wifiGotIP  && mqttClient.connState != TCP_CONNECTING) {
      MQTT_Connect(&mqttClient);
    }
    else if (status == wifiIsDisconnected && mqttClient.connState == TCP_CONNECTING) {
      MQTT_Disconnect(&mqttClient);
    }
  }
}

void ICACHE_FLASH_ATTR
mqtt_client_init()
{
  if (flashConfig.mqtt_enable) {
    MQTT_Init(&mqttClient, flashConfig.mqtt_host, flashConfig.mqtt_port, 0, flashConfig.mqtt_timeout,
      flashConfig.mqtt_clientid, flashConfig.mqtt_username, flashConfig.mqtt_password,
      flashConfig.mqtt_keepalive);

    if (flashConfig.mqtt_status_enable) {
      statusTopicStr = (char*)os_zalloc(strlen(flashConfig.mqtt_clientid) + strlen(flashConfig.mqtt_status_topic) + 2);
      os_strcpy(statusTopicStr, flashConfig.mqtt_clientid);
      os_strcat(statusTopicStr, "/");
      os_strcat(statusTopicStr, flashConfig.mqtt_status_topic);
    }

    char* onlineMsg = " is online";
    onlineMsgStr = (char*)os_zalloc(strlen(flashConfig.mqtt_clientid) + strlen(onlineMsg) + 1);
    os_strcpy(onlineMsgStr, flashConfig.mqtt_clientid);
    os_strcat(onlineMsgStr, onlineMsg);

    char* offlineMsg = " is offline";
    char* offlineMsgStr = (char*)os_zalloc(strlen(flashConfig.mqtt_clientid) + strlen(offlineMsg) + 1);
    os_strcpy(offlineMsgStr, flashConfig.mqtt_clientid);
    os_strcat(offlineMsgStr, offlineMsg);

    char* lwt = "/lwt";
    char *lwtMsgStr = (char*)os_zalloc(strlen(flashConfig.mqtt_clientid) + strlen(lwt) + 1);
    os_strcpy(lwtMsgStr, flashConfig.mqtt_clientid);
    os_strcat(lwtMsgStr, lwt);
    MQTT_InitLWT(&mqttClient, lwtMsgStr, offlineMsg, 0, 0);

    MQTT_OnConnected(&mqttClient, mqttConnectedCb);
    MQTT_OnDisconnected(&mqttClient, mqttDisconnectedCb);
    MQTT_OnPublished(&mqttClient, mqttPublishedCb);
    MQTT_OnData(&mqttClient, mqttDataCb);
  }

  wifiAddStateChangeCb(wifiStateChangeCb);
}

void ICACHE_FLASH_ATTR
mqtt_client_on_connected(MqttCallback connectedCb) {
  connected_cb = connectedCb;
}

void ICACHE_FLASH_ATTR
mqtt_client_on_disconnected(MqttCallback disconnectedCb) {
  disconnected_cb = disconnectedCb;
}

void ICACHE_FLASH_ATTR
mqtt_client_on_published(MqttCallback publishedCb) {
  published_cb = publishedCb;
}

void ICACHE_FLASH_ATTR
mqtt_client_on_data(MqttDataCallback dataCb) {
  data_cb = dataCb;
}