int mosquitto_reconnect(struct mosquitto *mosq)
{
int rc;
if(!mosq) return MOSQ_ERR_INVAL;
if(!mosq->host || mosq->port <= 0) return MOSQ_ERR_INVAL;
rc = _mosquitto_socket_connect(mosq, mosq->host, mosq->port);
if(rc){
return rc;
}
return _mosquitto_send_connect(mosq, mosq->keepalive, mosq->clean_session);
}
int mosquitto_reconnect(struct mosquitto *mosq)
{
int rc;
struct _mosquitto_packet *packet;
if(!mosq) return MOSQ_ERR_INVAL;
if(!mosq->host || mosq->port <= 0) return MOSQ_ERR_INVAL;
pthread_mutex_lock(&mosq->state_mutex);
mosq->state = mosq_cs_new;
pthread_mutex_unlock(&mosq->state_mutex);
pthread_mutex_lock(&mosq->msgtime_mutex);
mosq->last_msg_in = time(NULL);
mosq->last_msg_out = time(NULL);
pthread_mutex_unlock(&mosq->msgtime_mutex);
mosq->ping_t = 0;
_mosquitto_packet_cleanup(&mosq->in_packet);
pthread_mutex_lock(&mosq->current_out_packet_mutex);
pthread_mutex_lock(&mosq->out_packet_mutex);
if(mosq->out_packet && !mosq->current_out_packet) {
mosq->current_out_packet = mosq->out_packet;
mosq->out_packet = mosq->out_packet->next;
}
while(mosq->current_out_packet) {
packet = mosq->current_out_packet;
/* Free data and reset values */
mosq->current_out_packet = mosq->out_packet;
if(mosq->out_packet) {
mosq->out_packet = mosq->out_packet->next;
}
_mosquitto_packet_cleanup(packet);
_mosquitto_free(packet);
}
pthread_mutex_unlock(&mosq->out_packet_mutex);
pthread_mutex_unlock(&mosq->current_out_packet_mutex);
_mosquitto_messages_reconnect_reset(mosq);
rc = _mosquitto_socket_connect(mosq, mosq->host, mosq->port);
if(rc) {
return rc;
}
return _mosquitto_send_connect(mosq, mosq->keepalive, mosq->clean_session);
}
int main(int argc, char *argv[])
{
struct mosquitto *mosq;
int fd;
bool clean_session = true;
int keepalive = 60;
mosq = mosquitto_new("packetgen", NULL);
if(!mosq){
fprintf(stderr, "Error: Out of memory.\n");
return 1;
}
/* CONNECT */
fd = open("mqtt.connect", O_CREAT|O_WRONLY, 00644);
if(fd<0){
fprintf(stderr, "Error: Unable to open mqtt.connect for writing.\n");
return 1;
}
mosq->core.sock = fd;
printf("_mosquitto_send_connect(): %d\n", _mosquitto_send_connect(mosq, keepalive, clean_session));
printf("loop: %d\n", mosquitto_loop_write(mosq));
close(fd);
/* SUBSCRIBE */
fd = open("mqtt.subscribe", O_CREAT|O_WRONLY, 00644);
if(fd<0){
fprintf(stderr, "Error: Unable to open mqtt.subscribe for writing.\n");
return 1;
}
mosq->core.sock = fd;
printf("_mosquitto_send_subscribe(): %d\n", _mosquitto_send_subscribe(mosq, NULL, false, "subscribe/topic", 2));
printf("loop: %d\n", mosquitto_loop_write(mosq));
close(fd);
mosquitto_destroy(mosq);
return 0;
}
static int _mosquitto_reconnect(struct mosquitto *mosq, bool blocking)
{
int rc;
struct _mosquitto_packet *packet;
if(!mosq) return MOSQ_ERR_INVAL;
if(!mosq->host || mosq->port <= 0) return MOSQ_ERR_INVAL;
pthread_mutex_lock(&mosq->state_mutex);
#ifdef WITH_SOCKS
if(mosq->socks5_host){
mosq->state = mosq_cs_socks5_new;
}else
#endif
{
mosq->state = mosq_cs_new;
}
pthread_mutex_unlock(&mosq->state_mutex);
pthread_mutex_lock(&mosq->msgtime_mutex);
mosq->last_msg_in = mosquitto_time();
mosq->last_msg_out = mosquitto_time();
pthread_mutex_unlock(&mosq->msgtime_mutex);
mosq->ping_t = 0;
_mosquitto_packet_cleanup(&mosq->in_packet);
pthread_mutex_lock(&mosq->current_out_packet_mutex);
pthread_mutex_lock(&mosq->out_packet_mutex);
if(mosq->out_packet && !mosq->current_out_packet){
mosq->current_out_packet = mosq->out_packet;
mosq->out_packet = mosq->out_packet->next;
}
while(mosq->current_out_packet){
packet = mosq->current_out_packet;
/* Free data and reset values */
mosq->current_out_packet = mosq->out_packet;
if(mosq->out_packet){
mosq->out_packet = mosq->out_packet->next;
}
_mosquitto_packet_cleanup(packet);
_mosquitto_free(packet);
}
pthread_mutex_unlock(&mosq->out_packet_mutex);
pthread_mutex_unlock(&mosq->current_out_packet_mutex);
_mosquitto_messages_reconnect_reset(mosq);
#ifdef WITH_SOCKS
if(mosq->socks5_host){
rc = _mosquitto_socket_connect(mosq, mosq->socks5_host, mosq->socks5_port, mosq->bind_address, blocking);
}else
#endif
{
rc = _mosquitto_socket_connect(mosq, mosq->host, mosq->port, mosq->bind_address, blocking);
}
if(rc>0){
return rc;
}
#ifdef WITH_SOCKS
if(mosq->socks5_host){
return mosquitto__socks5_send(mosq);
}else
#endif
{
return _mosquitto_send_connect(mosq, mosq->keepalive, mosq->clean_session);
}
}
int mqtt3_bridge_connect(struct mosquitto_db *db, struct mosquitto *context)
{
int rc;
int i;
char *notification_topic;
int notification_topic_len;
uint8_t notification_payload;
if(!context || !context->bridge) return MOSQ_ERR_INVAL;
context->state = mosq_cs_new;
context->sock = INVALID_SOCKET;
context->last_msg_in = mosquitto_time();
context->next_msg_out = mosquitto_time() + context->bridge->keepalive;
context->keepalive = context->bridge->keepalive;
context->clean_session = context->bridge->clean_session;
context->in_packet.payload = NULL;
context->ping_t = 0;
context->bridge->lazy_reconnect = false;
mqtt3_bridge_packet_cleanup(context);
mqtt3_db_message_reconnect_reset(db, context);
if(context->clean_session){
mqtt3_db_messages_delete(db, context);
}
/* Delete all local subscriptions even for clean_session==false. We don't
* remove any messages and the next loop carries out the resubscription
* anyway. This means any unwanted subs will be removed.
*/
mqtt3_subs_clean_session(db, context);
for(i=0; i<context->bridge->topic_count; i++){
if(context->bridge->topics[i].direction == bd_out || context->bridge->topics[i].direction == bd_both){
_mosquitto_log_printf(NULL, MOSQ_LOG_DEBUG, "Bridge %s doing local SUBSCRIBE on topic %s", context->id, context->bridge->topics[i].local_topic);
if(mqtt3_sub_add(db, context, context->bridge->topics[i].local_topic, context->bridge->topics[i].qos, &db->subs)) return 1;
}
}
if(context->bridge->notifications){
if(context->bridge->notification_topic){
if(!context->bridge->initial_notification_done){
notification_payload = '0';
mqtt3_db_messages_easy_queue(db, context, context->bridge->notification_topic, 1, 1, ¬ification_payload, 1);
context->bridge->initial_notification_done = true;
}
notification_payload = '0';
rc = _mosquitto_will_set(context, context->bridge->notification_topic, 1, ¬ification_payload, 1, true);
if(rc != MOSQ_ERR_SUCCESS){
return rc;
}
}else{
notification_topic_len = strlen(context->bridge->remote_clientid)+strlen("$SYS/broker/connection//state");
notification_topic = _mosquitto_malloc(sizeof(char)*(notification_topic_len+1));
if(!notification_topic) return MOSQ_ERR_NOMEM;
snprintf(notification_topic, notification_topic_len+1, "$SYS/broker/connection/%s/state", context->bridge->remote_clientid);
if(!context->bridge->initial_notification_done){
notification_payload = '0';
mqtt3_db_messages_easy_queue(db, context, notification_topic, 1, 1, ¬ification_payload, 1);
context->bridge->initial_notification_done = true;
}
notification_payload = '0';
rc = _mosquitto_will_set(context, notification_topic, 1, ¬ification_payload, 1, true);
_mosquitto_free(notification_topic);
if(rc != MOSQ_ERR_SUCCESS){
return rc;
}
}
}
_mosquitto_log_printf(NULL, MOSQ_LOG_NOTICE, "Connecting bridge %s (%s:%d)", context->bridge->name, context->bridge->addresses[context->bridge->cur_address].address, context->bridge->addresses[context->bridge->cur_address].port);
rc = _mosquitto_socket_connect(context, context->bridge->addresses[context->bridge->cur_address].address, context->bridge->addresses[context->bridge->cur_address].port, NULL, false);
if(rc > 0 ){
if(rc == MOSQ_ERR_TLS){
_mosquitto_socket_close(db, context);
return rc; /* Error already printed */
}else if(rc == MOSQ_ERR_ERRNO){
_mosquitto_log_printf(NULL, MOSQ_LOG_ERR, "Error creating bridge: %s.", strerror(errno));
}else if(rc == MOSQ_ERR_EAI){
_mosquitto_log_printf(NULL, MOSQ_LOG_ERR, "Error creating bridge: %s.", gai_strerror(errno));
}
return rc;
}
HASH_ADD(hh_sock, db->contexts_by_sock, sock, sizeof(context->sock), context);
if(rc == MOSQ_ERR_CONN_PENDING){
context->state = mosq_cs_connect_pending;
}
rc = _mosquitto_send_connect(context, context->keepalive, context->clean_session);
if(rc == MOSQ_ERR_SUCCESS){
return MOSQ_ERR_SUCCESS;
}else if(rc == MOSQ_ERR_ERRNO && errno == ENOTCONN){
return MOSQ_ERR_SUCCESS;
}else{
if(rc == MOSQ_ERR_TLS){
return rc; /* Error already printed */
}else if(rc == MOSQ_ERR_ERRNO){
_mosquitto_log_printf(NULL, MOSQ_LOG_ERR, "Error creating bridge: %s.", strerror(errno));
}else if(rc == MOSQ_ERR_EAI){
_mosquitto_log_printf(NULL, MOSQ_LOG_ERR, "Error creating bridge: %s.", gai_strerror(errno));
}
_mosquitto_socket_close(db, context);
return rc;
}
}
int mosquitto__socks5_read(struct mosquitto *mosq)
{
ssize_t len;
uint8_t *payload;
uint8_t i;
if(mosq->state == mosq_cs_socks5_start){
while(mosq->in_packet.to_process > 0){
len = _mosquitto_net_read(mosq, &(mosq->in_packet.payload[mosq->in_packet.pos]), mosq->in_packet.to_process);
if(len > 0){
mosq->in_packet.pos += len;
mosq->in_packet.to_process -= len;
}else{
#ifdef WIN32
errno = WSAGetLastError();
#endif
if(errno == EAGAIN || errno == COMPAT_EWOULDBLOCK){
return MOSQ_ERR_SUCCESS;
}else{
_mosquitto_packet_cleanup(&mosq->in_packet);
switch(errno){
case 0:
return MOSQ_ERR_PROXY;
case COMPAT_ECONNRESET:
return MOSQ_ERR_CONN_LOST;
default:
return MOSQ_ERR_ERRNO;
}
}
}
}
if(mosq->in_packet.payload[0] != 5){
_mosquitto_packet_cleanup(&mosq->in_packet);
return MOSQ_ERR_PROXY;
}
switch(mosq->in_packet.payload[1]){
case SOCKS_AUTH_NONE:
_mosquitto_packet_cleanup(&mosq->in_packet);
mosq->state = mosq_cs_socks5_auth_ok;
return mosquitto__socks5_send(mosq);
case SOCKS_AUTH_USERPASS:
_mosquitto_packet_cleanup(&mosq->in_packet);
mosq->state = mosq_cs_socks5_send_userpass;
return mosquitto__socks5_send(mosq);
default:
_mosquitto_packet_cleanup(&mosq->in_packet);
return MOSQ_ERR_AUTH;
}
}else if(mosq->state == mosq_cs_socks5_userpass_reply){
while(mosq->in_packet.to_process > 0){
len = _mosquitto_net_read(mosq, &(mosq->in_packet.payload[mosq->in_packet.pos]), mosq->in_packet.to_process);
if(len > 0){
mosq->in_packet.pos += len;
mosq->in_packet.to_process -= len;
}else{
#ifdef WIN32
errno = WSAGetLastError();
#endif
if(errno == EAGAIN || errno == COMPAT_EWOULDBLOCK){
return MOSQ_ERR_SUCCESS;
}else{
_mosquitto_packet_cleanup(&mosq->in_packet);
switch(errno){
case 0:
return MOSQ_ERR_PROXY;
case COMPAT_ECONNRESET:
return MOSQ_ERR_CONN_LOST;
default:
return MOSQ_ERR_ERRNO;
}
}
}
}
if(mosq->in_packet.payload[0] != 1){
_mosquitto_packet_cleanup(&mosq->in_packet);
return MOSQ_ERR_PROXY;
}
if(mosq->in_packet.payload[1] == 0){
_mosquitto_packet_cleanup(&mosq->in_packet);
mosq->state = mosq_cs_socks5_auth_ok;
return mosquitto__socks5_send(mosq);
}else{
i = mosq->in_packet.payload[1];
_mosquitto_packet_cleanup(&mosq->in_packet);
switch(i){
case SOCKS_REPLY_CONNECTION_NOT_ALLOWED:
return MOSQ_ERR_AUTH;
case SOCKS_REPLY_NETWORK_UNREACHABLE:
case SOCKS_REPLY_HOST_UNREACHABLE:
case SOCKS_REPLY_CONNECTION_REFUSED:
return MOSQ_ERR_NO_CONN;
case SOCKS_REPLY_GENERAL_FAILURE:
case SOCKS_REPLY_TTL_EXPIRED:
case SOCKS_REPLY_COMMAND_NOT_SUPPORTED:
case SOCKS_REPLY_ADDRESS_TYPE_NOT_SUPPORTED:
return MOSQ_ERR_PROXY;
default:
return MOSQ_ERR_INVAL;
}
return MOSQ_ERR_PROXY;
}
}else if(mosq->state == mosq_cs_socks5_request){
while(mosq->in_packet.to_process > 0){
len = _mosquitto_net_read(mosq, &(mosq->in_packet.payload[mosq->in_packet.pos]), mosq->in_packet.to_process);
if(len > 0){
mosq->in_packet.pos += len;
mosq->in_packet.to_process -= len;
}else{
#ifdef WIN32
errno = WSAGetLastError();
#endif
if(errno == EAGAIN || errno == COMPAT_EWOULDBLOCK){
return MOSQ_ERR_SUCCESS;
}else{
_mosquitto_packet_cleanup(&mosq->in_packet);
switch(errno){
case 0:
return MOSQ_ERR_PROXY;
case COMPAT_ECONNRESET:
return MOSQ_ERR_CONN_LOST;
default:
return MOSQ_ERR_ERRNO;
}
}
}
}
if(mosq->in_packet.packet_length == 5){
/* First part of the packet has been received, we now know what else to expect. */
if(mosq->in_packet.payload[3] == SOCKS_ATYPE_IP_V4){
mosq->in_packet.to_process += 4+2-1; /* 4 bytes IPv4, 2 bytes port, -1 byte because we've already read the first byte */
mosq->in_packet.packet_length += 4+2-1;
}else if(mosq->in_packet.payload[3] == SOCKS_ATYPE_IP_V6){
mosq->in_packet.to_process += 16+2-1; /* 16 bytes IPv6, 2 bytes port, -1 byte because we've already read the first byte */
mosq->in_packet.packet_length += 16+2-1;
}else if(mosq->in_packet.payload[3] == SOCKS_ATYPE_DOMAINNAME){
if(mosq->in_packet.payload[4] > 0 && mosq->in_packet.payload[4] <= 255){
mosq->in_packet.to_process += mosq->in_packet.payload[4];
mosq->in_packet.packet_length += mosq->in_packet.payload[4];
}
}else{
_mosquitto_packet_cleanup(&mosq->in_packet);
return MOSQ_ERR_PROTOCOL;
}
payload = _mosquitto_realloc(mosq->in_packet.payload, mosq->in_packet.packet_length);
if(payload){
mosq->in_packet.payload = payload;
}else{
_mosquitto_packet_cleanup(&mosq->in_packet);
return MOSQ_ERR_NOMEM;
}
payload = _mosquitto_realloc(mosq->in_packet.payload, mosq->in_packet.packet_length);
if(payload){
mosq->in_packet.payload = payload;
}else{
_mosquitto_packet_cleanup(&mosq->in_packet);
return MOSQ_ERR_NOMEM;
}
return MOSQ_ERR_SUCCESS;
}
/* Entire packet is now read. */
if(mosq->in_packet.payload[0] != 5){
_mosquitto_packet_cleanup(&mosq->in_packet);
return MOSQ_ERR_PROXY;
}
if(mosq->in_packet.payload[1] == 0){
/* Auth passed */
_mosquitto_packet_cleanup(&mosq->in_packet);
mosq->state = mosq_cs_new;
return _mosquitto_send_connect(mosq, mosq->keepalive, mosq->clean_session);
}else{
i = mosq->in_packet.payload[1];
_mosquitto_packet_cleanup(&mosq->in_packet);
mosq->state = mosq_cs_socks5_new;
switch(i){
case SOCKS_REPLY_CONNECTION_NOT_ALLOWED:
return MOSQ_ERR_AUTH;
case SOCKS_REPLY_NETWORK_UNREACHABLE:
case SOCKS_REPLY_HOST_UNREACHABLE:
case SOCKS_REPLY_CONNECTION_REFUSED:
return MOSQ_ERR_NO_CONN;
case SOCKS_REPLY_GENERAL_FAILURE:
case SOCKS_REPLY_TTL_EXPIRED:
case SOCKS_REPLY_COMMAND_NOT_SUPPORTED:
case SOCKS_REPLY_ADDRESS_TYPE_NOT_SUPPORTED:
return MOSQ_ERR_PROXY;
default:
return MOSQ_ERR_INVAL;
}
}
}else{
return _mosquitto_packet_read(mosq);
}
return MOSQ_ERR_SUCCESS;
}
int mqtt3_bridge_connect(struct mosquitto_db *db, struct mosquitto *context)
{
int rc;
int i;
char *notification_topic;
int notification_topic_len;
uint8_t notification_payload;
if(!context || !context->bridge) return MOSQ_ERR_INVAL;
context->state = mosq_cs_new;
context->sock = -1;
context->last_msg_in = mosquitto_time();
context->last_msg_out = mosquitto_time();
context->keepalive = context->bridge->keepalive;
context->clean_session = context->bridge->clean_session;
context->in_packet.payload = NULL;
context->ping_t = 0;
context->bridge->lazy_reconnect = false;
mqtt3_bridge_packet_cleanup(context);
mqtt3_db_message_reconnect_reset(context);
if(context->clean_session){
mqtt3_db_messages_delete(context);
}
rc = mosquitto_unpwd_check(db, context->bridge->local_username, context->bridge->local_password);
switch(rc){
case MOSQ_ERR_SUCCESS:
break;
case MOSQ_ERR_AUTH:
_mosquitto_log_printf(NULL, MOSQ_LOG_ERR, "Bridge %s failed authentication on local broker.", context->id);
return rc;
case MOSQ_ERR_UNKNOWN:
_mosquitto_log_printf(NULL, MOSQ_LOG_ERR, "Bridge %s returned application error in authorisation.", context->id);
return rc;
default:
_mosquitto_log_printf(NULL, MOSQ_LOG_ERR, "Unknown error in authentication for bridge %s.", context->id);
return rc;
}
/* Delete all local subscriptions even for clean_session==false. We don't
* remove any messages and the next loop carries out the resubscription
* anyway. This means any unwanted subs will be removed.
*/
mqtt3_subs_clean_session(db, context, &db->subs);
for(i=0; i<context->bridge->topic_count; i++){
if(context->bridge->topics[i].direction == bd_out || context->bridge->topics[i].direction == bd_both){
_mosquitto_log_printf(NULL, MOSQ_LOG_DEBUG, "Bridge %s doing local SUBSCRIBE on topic %s", context->id, context->bridge->topics[i].local_topic);
if(mqtt3_sub_add(db, context, context->bridge->topics[i].local_topic, context->bridge->topics[i].qos, &db->subs)) return 1;
}
}
if(context->bridge->notifications){
notification_payload = '0';
if(context->bridge->notification_topic){
mqtt3_db_messages_easy_queue(db, context, context->bridge->notification_topic, 1, 1, ¬ification_payload, 1);
rc = _mosquitto_will_set(context, context->bridge->notification_topic, 1, ¬ification_payload, 1, true);
if(rc != MOSQ_ERR_SUCCESS){
return rc;
}
}else{
notification_topic_len = strlen(context->id)+strlen("$SYS/broker/connection//state");
notification_topic = _mosquitto_malloc(sizeof(char)*(notification_topic_len+1));
if(!notification_topic) return MOSQ_ERR_NOMEM;
snprintf(notification_topic, notification_topic_len+1, "$SYS/broker/connection/%s/state", context->id);
mqtt3_db_messages_easy_queue(db, context, notification_topic, 1, 1, ¬ification_payload, 1);
rc = _mosquitto_will_set(context, notification_topic, 1, ¬ification_payload, 1, true);
if(rc != MOSQ_ERR_SUCCESS){
_mosquitto_free(notification_topic);
return rc;
}
_mosquitto_free(notification_topic);
}
}
_mosquitto_log_printf(NULL, MOSQ_LOG_NOTICE, "Connecting bridge %s (%s:%d)", context->bridge->name, context->bridge->addresses[context->bridge->cur_address].address, context->bridge->addresses[context->bridge->cur_address].port);
rc = _mosquitto_socket_connect(context, context->bridge->addresses[context->bridge->cur_address].address, context->bridge->addresses[context->bridge->cur_address].port, NULL, true);
if(rc != MOSQ_ERR_SUCCESS){
if(rc == MOSQ_ERR_TLS){
return rc; /* Error already printed */
}else if(rc == MOSQ_ERR_ERRNO){
_mosquitto_log_printf(NULL, MOSQ_LOG_ERR, "Error creating bridge: %s.", strerror(errno));
}else if(rc == MOSQ_ERR_EAI){
_mosquitto_log_printf(NULL, MOSQ_LOG_ERR, "Error creating bridge: %s.", gai_strerror(errno));
}
return rc;
}
rc = _mosquitto_send_connect(context, context->keepalive, context->clean_session);
if(rc == MOSQ_ERR_SUCCESS){
return MOSQ_ERR_SUCCESS;
}else if(rc == MOSQ_ERR_ERRNO && errno == ENOTCONN){
return MOSQ_ERR_SUCCESS;
}else{
if(rc == MOSQ_ERR_TLS){
return rc; /* Error already printed */
}else if(rc == MOSQ_ERR_ERRNO){
_mosquitto_log_printf(NULL, MOSQ_LOG_ERR, "Error creating bridge: %s.", strerror(errno));
}else if(rc == MOSQ_ERR_EAI){
_mosquitto_log_printf(NULL, MOSQ_LOG_ERR, "Error creating bridge: %s.", gai_strerror(errno));
}
_mosquitto_socket_close(context);
return rc;
}
}
int mosquitto_reconnect(struct mosquitto *mosq)
{
int rc;
struct _mosquitto_packet *packet;
//输入参数是否正规的判断
if(!mosq) return MOSQ_ERR_INVAL;
if(!mosq->host || mosq->port <= 0) return MOSQ_ERR_INVAL;
//更新连接状态
pthread_mutex_lock(&mosq->state_mutex);
mosq->state = mosq_cs_new;
pthread_mutex_unlock(&mosq->state_mutex);
//重置最后接受和发送信息的时间
pthread_mutex_lock(&mosq->msgtime_mutex);
mosq->last_msg_in = time(NULL);
mosq->last_msg_out = time(NULL);
pthread_mutex_unlock(&mosq->msgtime_mutex);
//PING命令等待时间置0
mosq->ping_t = 0;
//清理接受包的信息
_mosquitto_packet_cleanup(&mosq->in_packet);
pthread_mutex_lock(&mosq->current_out_packet_mutex);
pthread_mutex_lock(&mosq->out_packet_mutex);
//当发送包信息已经初始化 并且 当前发送包信息为空
if(mosq->out_packet && !mosq->current_out_packet) {
mosq->current_out_packet = mosq->out_packet;
mosq->out_packet = mosq->out_packet->next;
}
//清理发送包信息
while(mosq->current_out_packet) {
//指向当前发送包信息
packet = mosq->current_out_packet;
/* Free data and reset values */
mosq->current_out_packet = mosq->out_packet;
if(mosq->out_packet) {
mosq->out_packet = mosq->out_packet->next;
}
//清理包信息
_mosquitto_packet_cleanup(packet);
//释放包
_mosquitto_free(packet);
}
pthread_mutex_unlock(&mosq->out_packet_mutex);
pthread_mutex_unlock(&mosq->current_out_packet_mutex);
//删除收到的信息内容，并删除不需要等待回应的发出的信息内容
_mosquitto_messages_reconnect_reset(mosq);
//创建一个socket，连接到指定的host和port
rc = _mosquitto_socket_connect(mosq, mosq->host, mosq->port);
if(rc) {
return rc;
}
return _mosquitto_send_connect(mosq, mosq->keepalive, mosq->clean_session);
}
