diff --git a/components/lwip/apps/multi-threads/sockets_mt.c b/components/lwip/apps/multi-threads/sockets_mt.c
index abf8c611..c090f907 100644
--- a/components/lwip/apps/multi-threads/sockets_mt.c
+++ b/components/lwip/apps/multi-threads/sockets_mt.c
@@ -757,8 +757,10 @@ int lwip_close(int s)
 {
     int ret;
 
-#if ESP_UDP && LWIP_NETIF_TX_SINGLE_PBUF
-    udp_sync_close(s);
+#if ESP_UDP
+    struct lwip_sock *sock = get_socket(s);
+    if (sock)
+        udp_sync_close_netconn(sock->conn);
 #endif
 
     _sock_set_open(s, 0);
diff --git a/components/lwip/lwip/src/api/api_msg.c b/components/lwip/lwip/src/api/api_msg.c
index 5d086065..3677ac51 100644
--- a/components/lwip/lwip/src/api/api_msg.c
+++ b/components/lwip/lwip/src/api/api_msg.c
@@ -1416,7 +1416,7 @@ lwip_netconn_do_send(void *m)
 #if LWIP_UDP
       case NETCONN_UDP:
 #if ESP_UDP
-        udp_sync_regitser(msg);
+        udp_sync_regitser_sock(msg);
 #endif /* ESP_UDP */
 #if LWIP_CHECKSUM_ON_COPY
         if (ip_addr_isany(&msg->msg.b->addr) || IP_IS_ANY_TYPE_VAL(msg->msg.b->addr)) {
@@ -1442,7 +1442,7 @@ lwip_netconn_do_send(void *m)
     }
   }
 #if ESP_UDP
-  udp_sync_ack(msg);
+  udp_sync_ack_sock(msg);
 #else
   TCPIP_APIMSG_ACK(msg);
 #endif /* ESP_UDP */
diff --git a/components/lwip/lwip/src/api/sockets.c b/components/lwip/lwip/src/api/sockets.c
index 25398343..9b049f73 100644
--- a/components/lwip/lwip/src/api/sockets.c
+++ b/components/lwip/lwip/src/api/sockets.c
@@ -630,8 +630,8 @@ lwip_close(int s)
 #endif /* LWIP_IGMP */
 
 #ifndef SOCKETS_MT
-#if ESP_UDP && LWIP_NETIF_TX_SINGLE_PBUF
-  udp_sync_close(s);
+#if ESP_UDP
+  udp_sync_close_netconn(sock->conn);
 #endif
 #endif
 
diff --git a/components/lwip/lwip/src/core/udp.c b/components/lwip/lwip/src/core/udp.c
index 400d2f5b..b5b67f96 100644
--- a/components/lwip/lwip/src/core/udp.c
+++ b/components/lwip/lwip/src/core/udp.c
@@ -865,6 +865,10 @@ udp_sendto_if_src_chksum(struct udp_pcb *pcb, struct pbuf *p, const ip_addr_t *d
   ttl = pcb->ttl;
 #endif /* LWIP_MULTICAST_TX_OPTIONS */
 
+#if ESP_UDP
+  udp_sync_cache_udp(pcb);
+#endif
+
   LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP checksum 0x%04"X16_F"\n", udphdr->chksum));
   LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,0x%02"X16_F",)\n", (u16_t)ip_proto));
   /* output to IP */
@@ -875,6 +879,10 @@ udp_sendto_if_src_chksum(struct udp_pcb *pcb, struct pbuf *p, const ip_addr_t *d
   /* @todo: must this be increased even if error occurred? */
   MIB2_STATS_INC(mib2.udpoutdatagrams);
 
+#if ESP_UDP
+  udp_sync_clear_udp();
+#endif
+
   /* did we chain a separate header pbuf earlier? */
   if (q != p) {
     /* free the header pbuf */
@@ -1116,6 +1124,11 @@ udp_remove(struct udp_pcb *pcb)
       }
     }
   }
+
+#if ESP_UDP
+  udp_sync_close_udp(pcb);
+#endif
+
   memp_free(MEMP_UDP_PCB, pcb);
 }
 
diff --git a/components/lwip/lwip/src/include/lwip/udp.h b/components/lwip/lwip/src/include/lwip/udp.h
index b9299073..3510a783 100644
--- a/components/lwip/lwip/src/include/lwip/udp.h
+++ b/components/lwip/lwip/src/include/lwip/udp.h
@@ -77,6 +77,8 @@ struct udp_pcb;
 typedef void (*udp_recv_fn)(void *arg, struct udp_pcb *pcb, struct pbuf *p,
     const ip_addr_t *addr, u16_t port);
 
+typedef int (*udp_cb_fn)(void *arg, int free);
+
 /** the UDP protocol control block */
 struct udp_pcb {
 /** Common members of all PCB types */
@@ -106,6 +108,15 @@ struct udp_pcb {
   udp_recv_fn recv;
   /** user-supplied argument for the recv callback */
   void *recv_arg;
+
+#if ESP_UDP
+  /* UDP PCB will be clear to "0" when call udp_new() */
+
+  /* UDP sync callback function mainly used for resend or active up level task */
+  udp_cb_fn cb;
+  /* UDP sync callback function private data */
+  void *arg;
+#endif
 };
 /* udp_pcbs export for external reference (e.g. SNMP agent) */
 extern struct udp_pcb *udp_pcbs;
diff --git a/components/lwip/port/esp8266/freertos/udp_sync.c b/components/lwip/port/esp8266/freertos/udp_sync.c
index ba4ba1e6..ed554dd6 100644
--- a/components/lwip/port/esp8266/freertos/udp_sync.c
+++ b/components/lwip/port/esp8266/freertos/udp_sync.c
@@ -12,6 +12,10 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+#include "lwipopts.h"
+
+#if ESP_UDP
+
 #include <stddef.h>
 #include <string.h>
 #include <stdbool.h>
@@ -20,12 +24,13 @@
 #include "lwip/priv/api_msg.h"
 #include "lwip/priv/tcp_priv.h"
 
+//#define LOG_LOCAL_LEVEL ESP_LOG_VERBOSE
+
 #include "esp_log.h"
 
-#if ESP_UDP && LWIP_NETIF_TX_SINGLE_PBUF
+#define UDP_SYNC_SOCK_RETRY_MAX CONFIG_ESP_UDP_SYNC_RETRY_MAX
 
-#define UDP_SYNC_MAX MEMP_NUM_NETCONN
-#define UDP_SYNC_RETRY_MAX CONFIG_ESP_UDP_SYNC_RETRY_MAX
+#define UDP_SYNC_UDP_RETRY_MAX 64
 
 /*
  * All function has no mutex, so they must put into one task(LWIP main task).
@@ -37,146 +42,178 @@
 #define TCPIP_APIMSG_ACK(m)   do { NETCONN_SET_SAFE_ERR((m)->conn, (m)->err); sys_sem_signal(LWIP_API_MSG_SEM(m)); } while(0)
 #endif /* LWIP_TCPIP_CORE_LOCKING */
 
-typedef struct udp_sync {
-    struct api_msg      *msg;
+#define UDP_SYNC_NONE 0
+#define UDP_SYNC_SOCK 1
+#define UDP_SYNC_UDP 2
 
-    struct netif        *netif;
+typedef struct udp_sync_method {
+    uint8_t             type;
+
+    void (*free) (void *p);
+} udp_sync_method_t;
+
+typedef struct udp_sync_udp {
+    udp_sync_method_t   method;
 
     int8_t              ret;
 
     uint8_t             retry;
-} udp_sync_t;
+
+    struct pbuf         *pbuf;
+
+    struct netif        *netif;
+
+    struct udp_pcb      *pcb;
+} udp_sync_udp_t;
+
+typedef struct udp_sync_sock {
+    udp_sync_method_t   method;
+
+    int8_t              ret;
+
+    uint8_t             retry;
+
+    struct api_msg      *msg;
+
+    struct netif        *netif;
+} udp_sync_sock_t;
+
+typedef struct udp_sync_netconn {
+    sys_sem_t       *sem;
+    struct netconn  *conn;
+} udp_sync_netconn_t;
 
 static const char *TAG = "udp_sync";
+static void *s_cur_msg;
+static size_t s_msg_type;
 static size_t s_udp_sync_num;
-static udp_sync_t s_udp_sync[UDP_SYNC_MAX];
-static struct api_msg *s_cur_msg;
 
-/*
- * @brief initialize UDP sync module
- */
-void udp_sync_init(void)
+static inline int _udp_need_proc(struct udp_pcb *pcb)
 {
-    memset(s_udp_sync, 0, sizeof(s_udp_sync));
-    s_udp_sync_num = 0;
+    return pcb->cb != NULL;
 }
 
-/*
- * @brief register a UDP API message(struct api_msg) to module
- */
-void udp_sync_regitser(void *in_msg)
+static inline int _udp_do_proc(struct udp_pcb *pcb, int force)
 {
-    s_cur_msg = in_msg;
+    return pcb->cb(pcb->arg, force);
+}
 
-    struct api_msg *msg = (struct api_msg *)in_msg;
-    int s = msg->conn->socket;
+static inline void *_udp_priv_data(struct udp_pcb *pcb)
+{
+    return pcb->arg;
+}
 
-    if (s < 0 || s >= UDP_SYNC_MAX) {
-        ESP_LOGE(TAG, "UDP sync register error, socket is %d", s);
-    } else if (s_udp_sync[s].msg) {
-        ESP_LOGE(TAG, "UDP sync register error, msg is %p", s_udp_sync[s].msg);
-    }
+static inline void _udp_end_proc(struct udp_pcb *pcb)
+{
+    pcb->cb = NULL;
+    pcb->arg = NULL;
+    s_udp_sync_num--;
+}
 
+static inline void _udp_add_proc(struct udp_pcb *pcb, udp_cb_fn cb, void *arg)
+{
     s_udp_sync_num++;
-    s_udp_sync[s].ret = ERR_OK;
-    s_udp_sync[s].retry = 0;
-    s_udp_sync[s].msg = msg;
+    pcb->cb = cb;
+    pcb->arg = arg;
 }
 
-static void _udp_sync_ack_ret(int s, struct api_msg *msg)
+static inline struct udp_pcb *_get_msg_pcb(struct api_msg *msg)
 {
+    return msg->conn->pcb.udp;
+}
+
+static void _udp_sync_do_meth_free(udp_sync_method_t *meth)
+{
+    meth->free(meth);
+}
+
+static int _udp_sync_ack_sock_ret(struct api_msg *msg, int force)
+{
+    int ret;
+    struct udp_pcb *pcb = msg->conn->pcb.udp;
+    udp_sync_sock_t *udp_sync_sock = _udp_priv_data(pcb);
+
     /* Only cache when low-level has no buffer to send packet */
-    if (s_udp_sync[s].ret != ERR_MEM || s_udp_sync[s].retry >= UDP_SYNC_RETRY_MAX) {
+    if (force || !udp_sync_sock || udp_sync_sock->ret != ERR_MEM || udp_sync_sock->retry >= UDP_SYNC_SOCK_RETRY_MAX) {
 
-        ESP_LOGD(TAG, "UDP sync ret %d retry %d", s_udp_sync[s].ret, s_udp_sync[s].retry);
-
-        s_udp_sync[s].msg = NULL;
-        s_udp_sync[s].retry = 0;
-        s_udp_sync[s].ret = ERR_OK;
-        s_udp_sync_num--;
+        if (udp_sync_sock) {
+            ESP_LOGD(TAG, "UDP sync sock ret %d retry %d", udp_sync_sock->ret, udp_sync_sock->retry);
+        }
 
         TCPIP_APIMSG_ACK(msg);
+
+        ret = ERR_OK;
     } else {
-        s_udp_sync[s].retry++;
-        ESP_LOGD(TAG, "UDP sync ack error, errno %d", s_udp_sync[s].ret);
+        udp_sync_sock->retry++;
+        ESP_LOGD(TAG, "UDP sync sock ack error, errno %d", udp_sync_sock->ret);
+
+        ret = ERR_INPROGRESS;
     }
+
+    return ret;
 }
 
-/*
- * @brief ack the message
- */
-void udp_sync_ack(void *in_msg)
+static void _udp_sync_meth_sock_free(void *p)
 {
-    struct api_msg *msg = (struct api_msg *)in_msg;
-    int s = msg->conn->socket;
-
-    if (s < 0 || s >= UDP_SYNC_MAX) {
-        ESP_LOGE(TAG, "UDP sync ack error, socket is %d", s);
-    } else if (!s_udp_sync[s].msg) {
-        ESP_LOGE(TAG, "UDP sync ack error, msg is NULL");
-    }
-
-    _udp_sync_ack_ret(s, msg);
-
-    s_cur_msg = NULL;
+    heap_caps_free(p);
 }
 
-/*
- * @brief set the current message send result
- */
-void udp_sync_set_ret(void *netif, int ret)
+static void _udp_sync_meth_udp_free(void *p)
 {
-    /* Only poll and regitser can set current message */
-    if (!s_cur_msg || !sys_current_task_is_tcpip()) {
-        /* You may use it to debug */
-        //ESP_LOGE(TAG, "UDP sync ack error, current message is %p, task name is %s", s_cur_msg, sys_current_task_name());
-        return ;
-    }
+    udp_sync_udp_t *udp_sync_udp = (udp_sync_udp_t *)p;
 
-    struct api_msg *msg = s_cur_msg;
-    int s = msg->conn->socket;
-
-    if (s < 0 || s >= UDP_SYNC_MAX) {
-        ESP_LOGE(TAG, "UDP sync ack error, socket is %d", s);
-    } else if (!s_udp_sync[s].msg) {
-        ESP_LOGE(TAG, "UDP sync ack error, msg is NULL");
-    }
-
-    s_udp_sync[s].netif = netif;
-    s_udp_sync[s].ret = ret;
+    pbuf_free(udp_sync_udp->pbuf);
+    heap_caps_free(udp_sync_udp);
 }
 
-static void udp_sync_send(struct api_msg *msg)
+static int sock_udp_sync_sock_cb(void *p, int force)
 {
-    struct pbuf *p = msg->msg.b->p;
-    int s = msg->conn->socket;
-    struct netif *netif = s_udp_sync[s].netif;
+    int ret;
+    udp_sync_sock_t *udp_sync_sock = (udp_sync_sock_t *)p;
+    struct api_msg *msg = udp_sync_sock->msg;
+    struct netif *netif = udp_sync_sock->netif;
+    struct pbuf *pbuf = msg->msg.b->p;
 
     s_cur_msg = msg;
+    s_msg_type = UDP_SYNC_SOCK;
 
-    netif->linkoutput(netif, p);
-    _udp_sync_ack_ret(s, msg);
+    netif->linkoutput(netif, pbuf);
+    ret = _udp_sync_ack_sock_ret(msg, force);
 
+    s_msg_type = UDP_SYNC_NONE;
     s_cur_msg = NULL;
+
+    return ret;
 }
 
-/*
- * @brief process the sync
- */
-void udp_sync_proc(void)
+static int sock_udp_sync_udp_cb(void *p, int force)
 {
-    if (!s_udp_sync_num)
-        return ;
+    int ret;
+    udp_sync_udp_t *udp_sync_udp = (udp_sync_udp_t *)p;
+    struct netif *netif = udp_sync_udp->netif;
+    struct pbuf *pbuf = udp_sync_udp->pbuf;
+    struct udp_pcb *pcb = udp_sync_udp->pcb;
 
-    for (int i = 0; i < UDP_SYNC_MAX; i++) {
-        if (!s_udp_sync[i].msg)
-            continue;
+    s_cur_msg = pcb;
+    s_msg_type = UDP_SYNC_UDP;
 
-        udp_sync_send(s_udp_sync[i].msg);
+    netif->linkoutput(netif, pbuf);
 
-        if (s_udp_sync[i].ret == ERR_MEM)
-            break;
+    s_msg_type = UDP_SYNC_NONE;
+    s_cur_msg = NULL;
+
+    if (force || udp_sync_udp->ret != ERR_MEM || udp_sync_udp->retry >= UDP_SYNC_UDP_RETRY_MAX) {
+        if (udp_sync_udp) {
+            ESP_LOGD(TAG, "UDP sync sync ret %d retry %d", udp_sync_udp->ret, udp_sync_udp->retry);
+        }
+        ret = ERR_OK;
+    } else {
+        udp_sync_udp->retry++;
+        ESP_LOGD(TAG, "UDP sync udp send error, errno %d", udp_sync_udp->ret);
+        ret = ERR_INPROGRESS;
     }
+
+    return ret;
 }
 
 /*
@@ -187,6 +224,167 @@ static void udp_sync_trigger_null(void *p)
 
 }
 
+static void udp_sync_do_close_netconn(void *p)
+{
+    udp_sync_netconn_t *sync = (udp_sync_netconn_t *)p;
+    struct netconn *conn = sync->conn;
+    sys_sem_t *sem = sync->sem;
+    struct udp_pcb *pcb = conn->pcb.udp;
+
+    udp_sync_close_udp(pcb);
+    sys_sem_signal(sem);
+}
+
+/*
+ * @brief ack the message
+ */
+void udp_sync_regitser_sock(void *in_msg)
+{
+    s_cur_msg = in_msg;
+    s_msg_type = UDP_SYNC_SOCK;
+
+    ESP_LOGD(TAG, "UDP sync regitser sock msg %p", in_msg);
+}
+
+/*
+ * @brief ack the message
+ */
+void udp_sync_ack_sock(void *in_msg)
+{
+    int ret;
+    struct api_msg *msg = (struct api_msg *)in_msg;
+    struct udp_pcb *pcb = _get_msg_pcb(msg);
+
+    ret = _udp_sync_ack_sock_ret(msg, 0);
+    if (ret == ERR_OK && _udp_need_proc(pcb)) {
+        udp_sync_method_t *method = (udp_sync_method_t *)_udp_priv_data(pcb);
+
+        _udp_sync_do_meth_free(method);
+        _udp_end_proc(pcb);
+    }
+
+    s_msg_type = UDP_SYNC_NONE;
+    s_cur_msg = NULL;
+
+    ESP_LOGD(TAG, "UDP sync ack msg %p", msg);
+}
+
+/*
+ * @brief set the current message send result
+ */
+void udp_sync_set_ret(void *netif, void *in_pbuf, int ret)
+{
+    struct udp_pcb *pcb;
+    struct api_msg *msg;
+    udp_sync_sock_t *udp_sync_sock;
+    udp_sync_udp_t *udp_sync_udp;
+    struct pbuf *pbuf;
+
+    /* Only poll and regitser can set current message */
+    if (!s_cur_msg || !sys_current_task_is_tcpip()) {
+        /* You may use it to debug */
+        //ESP_LOGE(TAG, "UDP sync ack error, current message is %p, task name is %s", s_cur_msg, sys_current_task_name());
+        return ;
+    }
+
+    switch (s_msg_type) {
+        case UDP_SYNC_SOCK:
+            msg = s_cur_msg;
+            pcb = _get_msg_pcb(msg);
+            udp_sync_sock = _udp_priv_data(pcb);
+
+            if (udp_sync_sock) {
+                udp_sync_sock->ret = ret;
+                ESP_LOGD(TAG, "UDP sync set1 port %d ret %d netif %p", pcb->local_port, ret, netif);
+                return ;
+            } else {
+                if (ERR_OK == ret) {
+                    return ;
+                }
+            }
+
+            udp_sync_sock = heap_caps_malloc(sizeof(udp_sync_sock_t), MALLOC_CAP_8BIT);
+            if (!udp_sync_sock) {
+                ESP_LOGE(TAG, "UDP sync sock regitser error MEM_ERR");
+                return ;
+            }
+
+            udp_sync_sock->method.free = _udp_sync_meth_sock_free;
+            udp_sync_sock->method.type = UDP_SYNC_SOCK;
+
+            udp_sync_sock->msg = msg;
+            udp_sync_sock->retry = 0;
+            udp_sync_sock->netif = netif;
+            udp_sync_sock->ret = ret;
+
+            _udp_add_proc(pcb, sock_udp_sync_sock_cb, udp_sync_sock);
+
+            ESP_LOGD(TAG, "UDP sync set2 port %d ret %d netif %p", pcb->local_port, ret, netif);
+            break;
+        case UDP_SYNC_UDP:
+            pcb = s_cur_msg;
+            udp_sync_udp = _udp_priv_data(pcb);
+
+            if (udp_sync_udp) {
+                udp_sync_udp->ret = ret;
+                ESP_LOGD(TAG, "UDP sync set3 port %d ret %d netif %p", pcb->local_port, ret, netif);
+                return ;
+            } else {
+                if (ERR_OK == ret)
+                    return ;
+            }
+
+            udp_sync_udp = heap_caps_malloc(sizeof(udp_sync_udp_t), MALLOC_CAP_8BIT);
+            if (!udp_sync_udp) {
+                ESP_LOGE(TAG, "UDP sync udp regitser error MEM_ERR");
+                return ;
+            }
+
+            pbuf = (struct pbuf *)in_pbuf;
+            pbuf_ref(pbuf);
+
+            udp_sync_udp->method.free = _udp_sync_meth_udp_free;
+            udp_sync_udp->method.type = UDP_SYNC_UDP;
+
+            udp_sync_udp->pbuf = pbuf;
+            udp_sync_udp->retry = 0;
+            udp_sync_udp->netif = netif;
+            udp_sync_udp->pcb = pcb;
+            udp_sync_udp->ret = ret;
+
+            _udp_add_proc(pcb, sock_udp_sync_udp_cb, udp_sync_udp);
+
+            ESP_LOGD(TAG, "UDP sync set4 port %d ret %d netif %p", pcb->local_port, ret, netif);
+            break;
+        default:
+            break;
+    }
+}
+
+void udp_sync_cache_udp(void *pcb)
+{
+    if (s_cur_msg || !sys_current_task_is_tcpip())
+        return ;
+
+    s_msg_type = UDP_SYNC_UDP;
+    s_cur_msg = pcb;
+
+    ESP_LOGD(TAG, "UDP sync cache udp %p", pcb);
+}
+
+void udp_sync_clear_udp(void)
+{
+    if (s_msg_type != UDP_SYNC_UDP || !sys_current_task_is_tcpip())
+        return ;
+
+    struct udp_pcb *pcb = (struct udp_pcb *)s_cur_msg;
+
+    s_msg_type = UDP_SYNC_NONE;
+    s_cur_msg = NULL;
+
+    ESP_LOGD(TAG, "UDP sync clear udp %p", pcb);
+}
+
 /*
  * @brief trigger a UDP sync process
  */
@@ -198,28 +396,66 @@ void udp_sync_trigger(void)
     tcpip_callback_with_block(udp_sync_trigger_null, NULL, 0);
 }
 
-/*
- * @brief close and clear the udp sync
- */
-static void udp_sync_do_close(void *p)
+/**
+ * @brief close the udp sync before close the socket
+ */ 
+void udp_sync_close_udp(void *udp_pcb)
 {
-    int s = (int)p;
+    struct udp_pcb *pcb = udp_pcb;
 
-    if (s_udp_sync[s].msg) {
-        ESP_LOGD(TAG, "UDP sync close socket %d", s);
-        s_udp_sync[s].msg = NULL;
-        s_udp_sync[s].retry = 0;
-        s_udp_sync[s].ret = ERR_OK;
-        s_udp_sync_num--;
+    ESP_LOGD(TAG, "UDP sync close port %d", pcb->local_port);
+
+    if (_udp_need_proc(pcb)) {
+        udp_sync_method_t *method = (udp_sync_method_t *)_udp_priv_data(pcb);
+
+        _udp_do_proc(pcb, 1);
+        _udp_sync_do_meth_free(method);
+        _udp_end_proc(pcb);
+        ESP_LOGD(TAG, "UDP sync free proc port %d", pcb->local_port);
     }
 }
 
 /**
- * @brief close the udp sync before close the socket
+ * @brief close the udp sync netconn before close the socket
  */ 
-void udp_sync_close(int s)
+void udp_sync_close_netconn(void *netconn)
 {
-    tcpip_callback_with_block(udp_sync_do_close, (void *)s, 1);
+    udp_sync_netconn_t sync;
+    struct netconn *conn = netconn;
+
+    if (conn->type != NETCONN_UDP)
+        return ;
+
+    sync.conn = netconn;
+    sync.sem = sys_thread_sem_get();
+
+    tcpip_callback(udp_sync_do_close_netconn, &sync);
+    sys_arch_sem_wait(sync.sem, 0);
+}
+
+/*
+ * @brief process the sync
+ */
+void udp_sync_proc(void)
+{
+    struct udp_pcb *pcb;
+
+    if (!s_udp_sync_num)
+        return ;
+
+    for (pcb = udp_pcbs; pcb != NULL; pcb = pcb->next) {
+        udp_sync_method_t *method;
+
+        if (!_udp_need_proc(pcb) || _udp_do_proc(pcb, 0) != ERR_OK)
+            continue;
+
+        method = (udp_sync_method_t *)_udp_priv_data(pcb);
+
+        _udp_sync_do_meth_free(method);
+        _udp_end_proc(pcb);
+
+        ESP_LOGD(TAG, "UDP sync end proc port %d", pcb->local_port);
+    }
 }
 
 #endif /* ESP_UDP */
diff --git a/components/lwip/port/esp8266/include/lwipopts.h b/components/lwip/port/esp8266/include/lwipopts.h
index b4203ae6..8af167e3 100644
--- a/components/lwip/port/esp8266/include/lwipopts.h
+++ b/components/lwip/port/esp8266/include/lwipopts.h
@@ -2224,8 +2224,8 @@ void *memp_malloc_ll(size_t type);
  */
 
 #if ESP_UDP
-#if !LWIP_UDP || !LWIP_SOCKET || !ESP_LWIP
-#error "LWIP_UDP & LWIP_SOCKET & ESP_LWIP must be enable"
+#if !LWIP_UDP || !LWIP_SOCKET || !ESP_LWIP || !LWIP_NETIF_TX_SINGLE_PBUF
+#error "LWIP_UDP & LWIP_SOCKET & ESP_LWIP & LWIP_NETIF_TX_SINGLE_PBUF must be enable"
 #else
 #include "udp_sync.h"
 #endif
diff --git a/components/lwip/port/esp8266/include/udp_sync.h b/components/lwip/port/esp8266/include/udp_sync.h
index a29a3586..81f6db1e 100644
--- a/components/lwip/port/esp8266/include/udp_sync.h
+++ b/components/lwip/port/esp8266/include/udp_sync.h
@@ -29,26 +29,30 @@ void udp_sync_init(void);
  * 
  * @param in_msg message pointer
  */
-void udp_sync_regitser(void *in_msg);
+void udp_sync_regitser_sock(void *in_msg);
 
 /*
  * @brief ack the message
  * 
  * @param in_msg message pointer
  */
-void udp_sync_ack(void *in_msg);
+void udp_sync_ack_sock(void *in_msg);
 
 /*
  * @brief set the current message send result
- * 
+ *
+ * @param netif LwIP netif pointer
+ * @param pbuf low-level netif output pbuf pointer
  * @param ret current message send result
  */
-void udp_sync_set_ret(void *netif, int ret);
+void udp_sync_set_ret(void *netif, void *pbuf, int ret);
+
+void udp_sync_cache_udp(void *pcb);
+
+void udp_sync_clear_udp(void);
 
 /*
  * @brief process the sync
- * 
- * @param ret current message send result
  */
 void udp_sync_proc(void);
 
@@ -58,9 +62,18 @@ void udp_sync_proc(void);
 void udp_sync_trigger(void);
 
 /**
- * @brief close the udp sync before close the socket
+ * @brief close the udp pcb
+ * 
+ * @param udp_pcb LwIP raw UDP pcb pointer
  */
-void udp_sync_close(int s);
+void udp_sync_close_udp(void *udp_pcb);
+
+/**
+ * @brief close the udp sync netconn before close the socket
+ * 
+ * @param netconn LwIP raw netconn pointer
+ */ 
+void udp_sync_close_netconn(void *netconn);
 
 #ifdef __cplusplus
 }
diff --git a/components/lwip/port/esp8266/netif/ethernetif.c b/components/lwip/port/esp8266/netif/ethernetif.c
index aa5c516c..9f89deff 100644
--- a/components/lwip/port/esp8266/netif/ethernetif.c
+++ b/components/lwip/port/esp8266/netif/ethernetif.c
@@ -345,7 +345,7 @@ static int8_t low_level_output(struct netif* netif, struct pbuf* p)
      */
     err = esp_aio_sendto(&aio, NULL, 0);
 #if ESP_UDP
-    udp_sync_set_ret(netif, err);
+    udp_sync_set_ret(netif, p, err);
 #endif
 
     if (err != ERR_OK) {