diff --git a/examples/network/mqttclient.c b/examples/network/mqttclient.c
deleted file mode 100644
index 17b049dd93..0000000000
--- a/examples/network/mqttclient.c
+++ /dev/null
@@ -1,560 +0,0 @@
-
-#define OS_RTTHREAD     1
-
-#if (OS_RTTHREAD == 0)
-#include <sys/socket.h>
-#include <sys/time.h>
-#include <sys/select.h>
-#include <netinet/in.h>
-#include <netinet/tcp.h>
-#include <arpa/inet.h>
-#include <netdb.h>
-#include <stdio.h>
-#include <unistd.h>
-#include <errno.h>
-#include <fcntl.h>
-#include <pthread.h>
-#include <signal.h>
-#include <stdlib.h>
-
-#define DEBUG printf
-#define SLEEP(x) sleep(x)
-#else
-#include <rtthread.h>
-#include <lwip/netdb.h> 
-#include <lwip/sockets.h>
-#include <arch/sys_arch.h>
-#include <lwip/sys.h>
-
-#define DEBUG rt_kprintf
-#define SLEEP(x) rt_thread_delay((x)*RT_TICK_PER_SECOND)
-#endif
-
-#include <string.h>
-#include "MQTTPacket.h"
-
-#define HOSTNAME     "m2m.eclipse.org"
-#define HOSTPORT     1883
-#define USERNAME     "testuser"
-#define PASSWORD     "testpassword"
-#define TOPIC        "test"
-
-#define KEEPALIVE_INTERVAL    20
-
-typedef struct
-{
-    int qos;
-    unsigned char retained;
-    unsigned char dup;
-    unsigned short id;
-    int payloadlen;
-    unsigned char *payload;
-}mqtt_msg_t;
-
-typedef struct
-{
-    int sockfd;
-    unsigned char *wbuf; //
-    int wbuflen;
-    unsigned char *rbuf;
-    int rbuflen;
-    int (*getfn)(unsigned char*, int);
-}mqtt_client_t;
-
-static mqtt_client_t _cpub;
-static mqtt_client_t _csub;
-
-static void *mqtt_ping_thread(void *param)
-{
-    int *sockfd = (int*)param;
-    unsigned char buf[2];
-    int len;
-
-    DEBUG("ping start\n");
-
-    while (*sockfd >= 0)
-    {
-        SLEEP(KEEPALIVE_INTERVAL-1);
-        len = MQTTSerialize_pingreq(buf, sizeof(buf));
-
-        send(*sockfd, buf, len, 0);
-    }
-
-    DEBUG("ping exit\n");
-
-    return 0;
-}
-
-void mqtt_ping_start(int *sockfd)
-{
-    #if (OS_RTTHREAD == 0)
-    pthread_t tid;
-
-    pthread_create(&tid, NULL, mqtt_ping_thread, (void*)sockfd);
-    #else
-    sys_thread_new("ping",
-                   mqtt_ping_thread,
-                   (void*)sockfd,
-                   512,
-                   20); 
-    #endif
-}
-
-static int sub_read(unsigned char *buf,  int len)
-{
-    int bytes = 0;
-    struct timeval interval;
-    int rc;
-
-    interval.tv_sec = 3;
-    interval.tv_usec = 0;
-
-    rc = setsockopt(_csub.sockfd, SOL_SOCKET, SO_RCVTIMEO, (char *)&interval, sizeof(struct timeval));
-
-    while (bytes < len)
-    {
-        rc = recv(_csub.sockfd, &buf[bytes], (size_t)(len - bytes), 0);
-
-        if (rc == -1)
-        {
-            if (errno != ENOTCONN && errno != ECONNRESET)
-            {
-                bytes = -1;
-                break;
-            }
-        }
-        else
-            bytes += rc;
-    }
-
-    return bytes;
-}
-
-static int pub_read(unsigned char *buf,  int len)
-{
-    int bytes = 0;
-    struct timeval interval;
-    int rc;
-
-    interval.tv_sec = 3;
-    interval.tv_usec = 0;
-
-    rc = setsockopt(_cpub.sockfd, SOL_SOCKET, SO_RCVTIMEO, (char *)&interval, sizeof(struct timeval));
-
-    while (bytes < len)
-    {
-        rc = recv(_cpub.sockfd, &buf[bytes], (size_t)(len - bytes), 0);
-
-        if (rc == -1)
-        {
-            if (errno != ENOTCONN && errno != ECONNRESET)
-            {
-                bytes = -1;
-                break;
-            }
-        }
-        else
-            bytes += rc;
-    }
-
-    return bytes;
-}
-
-int mqtt_write(int sockfd, unsigned char *buf,  int len)
-{
-    int rc;
-    struct timeval tv;
-
-    tv.tv_sec = 2;
-    tv.tv_usec = 0;
-
-    setsockopt(sockfd, SOL_SOCKET, SO_SNDTIMEO, (char *)&tv, sizeof(struct timeval));
-    rc = send(sockfd, buf, len, 0);
-    if (rc == len)
-        rc = 0;
-
-    return rc;
-}
-
-int mqtt_subscribe(mqtt_client_t *c, char* topicstr, int qos)
-{
-    MQTTString topic = MQTTString_initializer;
-    int msgid = 1;
-    int len;
-    int rc = -1;
-
-    topic.cstring = topicstr;
-    len = MQTTSerialize_subscribe(c->wbuf, c->wbuflen, 0, msgid, 1, &topic, &qos);
-    if (len <= 0)
-        goto exit;
-
-    rc = mqtt_write(c->sockfd, c->wbuf, len);
-    if (rc < 0)
-        goto exit;
-
-    if (MQTTPacket_read(c->rbuf, c->rbuflen, c->getfn) == SUBACK)
-    {
-        unsigned short submsgid;
-        int subcount;
-        int granted_qos;
-
-        rc = MQTTDeserialize_suback(&submsgid, 1, &subcount, &granted_qos, c->rbuf, c->rbuflen);
-        if (granted_qos != 0)
-        {
-            DEBUG("granted qos != 0, %d\n", granted_qos);
-            rc = -1;
-        }
-        else
-        {
-            rc = 0;
-        }
-    }
-    else
-    {
-        rc = -1;
-    }
-
-exit:
-    return rc;
-}
-
-int mqtt_publish(mqtt_client_t *c, char* topicstr, mqtt_msg_t *msg)
-{
-    int rc = -1;
-    MQTTString topic = MQTTString_initializer;
-    int len;
-    int pktype;
-
-    topic.cstring = topicstr;
-
-    len = MQTTSerialize_publish(c->wbuf, c->wbuflen,
-                                                   msg->dup, msg->qos, msg->retained, msg->id,
-                                                   topic, msg->payload, msg->payloadlen);
-    if (len <= 0)
-        goto exit;
-
-    if ((rc = mqtt_write(c->sockfd, c->wbuf, len)) <= 0)
-        goto exit;
-
-    pktype = MQTTPacket_read(c->rbuf, c->rbuflen, c->getfn);
-
-    if (msg->qos == 1)
-    {
-        if (pktype == PUBACK)
-        {
-            unsigned short mypacketid;
-            unsigned char dup, type;
-            if (MQTTDeserialize_ack(&type, &dup, &mypacketid, c->rbuf, c->rbuflen) != 1)
-                rc = -1;
-        }
-        else
-            rc = -1;
-    }
-    else if (msg->qos == 2)
-    {
-        if (pktype == PUBCOMP)
-        {
-            unsigned short mypacketid;
-            unsigned char dup, type;
-            if (MQTTDeserialize_ack(&type, &dup, &mypacketid, c->rbuf, c->rbuflen) != 1)
-                rc = -1;
-        }
-        else
-            rc = -1;
-    }
-
-exit:
-    return rc;
-}
-
-int mqtt_netconnect(char *addr, int port)
-{
-    struct hostent *host = 0;
-    struct sockaddr_in sockaddr;
-    int sock;
-
-    host = gethostbyname(addr);
-    if (host == 0)
-        return -1;
-
-    if ((sock = socket(AF_INET, SOCK_STREAM, 0)) == -1)
-    {
-        return -1;
-    }
-
-    sockaddr.sin_family = AF_INET;
-    sockaddr.sin_port = htons(port);
-    sockaddr.sin_addr = *((struct in_addr *)host->h_addr);
-    memset(&(sockaddr.sin_zero), 0, sizeof(sockaddr.sin_zero));
-
-    if (connect(sock, (struct sockaddr *)&sockaddr, sizeof(struct sockaddr)) == -1)
-    {
-        #if (OS_RTTHREAD == 0)
-        close(sock);
-        #else
-        closesocket(sock);
-        #endif
-        return -2;
-    }
-
-    return sock;
-}
-
-void mqtt_netdisconnect(int *sockfd)
-{
-    #if (OS_RTTHREAD == 0)
-    close(*sockfd);
-    #else
-    closesocket(*sockfd);
-    #endif
-    *sockfd = -1;
-}
-
-int mqtt_connect(mqtt_client_t *c, MQTTPacket_connectData *data)
-{
-    int rc = -1;
-    int len;
-
-    len = MQTTSerialize_connect(c->wbuf, c->wbuflen, data);
-    if (len <= 0)
-        goto exit;
-
-    rc = mqtt_write(c->sockfd, c->wbuf, len);
-    if (rc < 0)
-        goto exit;
-
-    rc = MQTTPacket_read(c->rbuf, c->rbuflen, c->getfn);
-    if (rc < 0)
-        goto exit;
-
-    if (rc == CONNACK)
-    {
-        unsigned char sessionPresent, connack_rc;
-
-        if (MQTTDeserialize_connack(&sessionPresent, &connack_rc, c->rbuf, c->rbuflen) == 1)
-        {
-            rc = connack_rc;
-        }
-        else
-        {
-            rc = -1;
-        }
-    }
-    else
-        rc = -1;
-
-exit:
-    return rc;
-}
-int mqtt_disconnect(mqtt_client_t *c)
-{
-    int rc = -1;
-    int len;
-
-    len = MQTTSerialize_disconnect(c->wbuf, c->wbuflen);
-    if (len > 0)
-    {
-        rc = mqtt_write(c->sockfd, c->wbuf, len);
-    }
-
-    return rc;
-}
-
-static void *mqtt_pub_thread(void *param)
-{
-    MQTTPacket_connectData condata = MQTTPacket_connectData_initializer;
-    int rc;
-    unsigned char rbuf[64];
-    unsigned char wbuf[64];
-
-    DEBUG("pub thread start\n");
-    /*  */
-    _cpub.rbuf = rbuf;
-    _cpub.rbuflen = sizeof(rbuf);
-    _cpub.wbuf = wbuf;
-    _cpub.wbuflen = sizeof(wbuf);
-    _cpub.getfn = pub_read;
-
-    if ((_cpub.sockfd = mqtt_netconnect(HOSTNAME, HOSTPORT)) < 0)
-    {
-        DEBUG("pub netconnet fail\n");
-
-        return 0;
-    }
-
-    DEBUG("pub connect to: %s %d\n", HOSTNAME, HOSTPORT);
-
-    condata.clientID.cstring = "mqttpub";
-    condata.keepAliveInterval = KEEPALIVE_INTERVAL;
-    condata.cleansession = 1;
-    condata.username.cstring = USERNAME;
-    condata.password.cstring = PASSWORD;
-
-    rc = mqtt_connect(&_cpub, &condata);
-    if (rc < 0)
-        goto exit;
-
-    DEBUG("pub connect ok\n");
-
-    mqtt_ping_start(&_cpub.sockfd);
-
-    while (rc == 0)
-    {
-        mqtt_msg_t msg;
-
-        SLEEP(5);
-        msg.dup = 0;
-        msg.id    = 0;
-        msg.qos = 0;
-        msg.retained = 0;
-        msg.payload = (unsigned char*)"RT-Thread";
-        msg.payloadlen = strlen((const char*)msg.payload);
-
-        rc = mqtt_publish(&_cpub, TOPIC, &msg);
-    }
-
-exit:
-    mqtt_netdisconnect(&_cpub.sockfd);
-    DEBUG("pub thread exit\n");
-
-    return 0;
-}
-
-void msgprocess(MQTTString *topic, mqtt_msg_t *msg)
-{
-    msg->payload[msg->payloadlen] = 0;
-    DEBUG("recv: size = %d, msg = %s\n", msg->payloadlen, msg->payload);
-}
-
-static void *mqtt_sub_thread(void *param)
-{
-    MQTTPacket_connectData condata = MQTTPacket_connectData_initializer;
-    int pktype, rc, len;
-    int failcnt = 0;
-    unsigned char wbuf[64];
-    unsigned char rbuf[64];
-
-    DEBUG("sub thread start\n");
-
-    _csub.wbuf = wbuf;
-    _csub.wbuflen = sizeof(wbuf);
-    _csub.rbuf = rbuf;
-    _csub.rbuflen = sizeof(rbuf);
-    _csub.getfn = sub_read;
-
-    if ((_csub.sockfd = mqtt_netconnect(HOSTNAME, HOSTPORT)) < 0)
-    {
-        DEBUG("sub netconnect fail\n");
-
-        return 0;
-    }
-
-    DEBUG("sub connect to: %s %d\n", HOSTNAME, HOSTPORT);
-
-    condata.clientID.cstring = "mqttsub";
-    condata.keepAliveInterval = KEEPALIVE_INTERVAL;
-    condata.cleansession = 1;
-    condata.username.cstring = USERNAME;
-    condata.password.cstring = PASSWORD;
-
-    rc = mqtt_connect(&_csub, &condata);
-    if (rc < 0)
-        goto exit;
-
-    DEBUG("sub connect ok\n");
-
-    rc = mqtt_subscribe(&_csub, TOPIC, 0);
-    if (rc < 0)
-        goto exit;
-
-    DEBUG("sub topic: %s\n", TOPIC);
-
-    mqtt_ping_start(&_csub.sockfd);
-
-    while (1)
-    {
-        pktype = MQTTPacket_read(_csub.rbuf, _csub.rbuflen, sub_read);
-
-        switch (pktype)
-        {
-        case CONNACK:
-        case PUBACK:
-        case SUBACK:
-            break;
-        case PUBLISH:
-        {
-            MQTTString topic;
-            mqtt_msg_t msg;
-
-            if (MQTTDeserialize_publish(&msg.dup, &msg.qos, &msg.retained, &msg.id, &topic,
-                                                         &msg.payload, &msg.payloadlen, _csub.rbuf, _csub.rbuflen) != 1)
-                goto exit;
-
-            msgprocess(&topic, &msg);
-
-            if (msg.qos != 0)
-            {
-                if (msg.qos == 1)
-                    len = MQTTSerialize_ack(_csub.wbuf, _csub.wbuflen, PUBACK, 0, msg.id);
-                else if (msg.qos == 2)
-                    len = MQTTSerialize_ack(_csub.wbuf, _csub.wbuflen, PUBREC, 0, msg.id);
-
-                if (len <= 0)
-                    rc = -1;
-                else
-                    rc = mqtt_write(_csub.sockfd, _csub.wbuf, len);
-
-                if (rc == -1)
-                    goto exit;
-            }
-        }
-        break;
-        case PUBCOMP:
-            break;
-        case PINGRESP:
-            failcnt = 0;
-            break;
-        case -1:
-            if (++failcnt > KEEPALIVE_INTERVAL)
-            {
-                /*  */
-                goto exit;
-            }
-            break;
-        }
-    }
-    /*  */
-    mqtt_disconnect(&_csub);
-
-exit:
-    mqtt_netdisconnect(&_csub.sockfd);
-    DEBUG("sub thread exit\n");
-
-    return 0;
-}
-
-void mqtt_client_init(void)
-{
-    #if (OS_RTTHREAD == 0)
-    pthread_t tid;
-
-    pthread_create(&tid, NULL, mqtt_sub_thread, NULL);
-    pthread_create(&tid, NULL, mqtt_pub_thread, NULL);
-    #else
-    sys_thread_new("sub",
-                   mqtt_sub_thread,
-                   NULL,
-                   1024,
-                   20);
-    sys_thread_new("pub",
-                   mqtt_pub_thread,
-                   NULL,
-                   1024,
-                   20); 
-    #endif
-}
-
-#ifdef RT_USING_FINSH
-#include <finsh.h>
-FINSH_FUNCTION_EXPORT(mqtt_client_init, MQTT Pub/Sub Test);
-#endif