feat(lwip): Add socket UDP sync function

components/lwip/port/esp8266/include/lwipopts.h

@@ -52,6 +52,10 @@
 
 #define ESP_LWIP 1
 
+#ifdef CONFIG_ESP_UDP_SYNC_SEND
+#define ESP_UDP  1
+#endif
+
 #ifdef CONFIG_LWIP_SOCKET_MULTITHREAD
 #define SOCKETS_MT
 #endif
@@ -2213,4 +2217,12 @@ 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"
+#else
+#include "udp_sync.h"
+#endif
+#endif
+
 #endif /* __LWIP_HDR_LWIPOPTS_H__ */

components/lwip/port/esp8266/include/udp_sync.h

@@ -0,0 +1,59 @@
+// Copyright 2018-2019 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef _UDP_SYNC_H
+#define _UDP_SYNC_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*
+ * @brief initialize UDP sync module
+ */
+void udp_sync_init(void);
+
+/*
+ * @brief register a UDP API message(struct api_msg) to module
+ * 
+ * @param in_msg message pointer
+ */
+void udp_sync_regitser(void *in_msg);
+
+/*
+ * @brief ack the message
+ * 
+ * @param in_msg message pointer
+ */
+void udp_sync_ack(void *in_msg);
+
+/*
+ * @brief set the current message send result
+ * 
+ * @param ret current message send result
+ */
+void udp_sync_set_ret(int ret);
+
+/*
+ * @brief process the sync
+ * 
+ * @param ret current message send result
+ */
+void udp_sync_proc(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _UDP_SYNC_H */