lwip2: fix static address management (#4677)

+ interactive example (for debugging)

tools/sdk/lwip2/include/gluedebug.h

@@ -2,6 +2,7 @@
 #ifndef __GLUE_DEBUG_H
 #define __GLUE_DEBUG_H
 
+// this file is commonly included by both sides of the glue
 /////////////////////////////////////////////////////////////////////////////
 // user-definable
 
@@ -27,6 +28,15 @@
 #define LWIP_DBG_TYPES_ON	(LWIP_DBG_ON)
 #endif
 
+/////////////////////////////////////////////////////////////////////////////
+// packet capture callback from esp side
+#include <stdlib.h>
+
+#ifdef __cplusplus
+extern "C"
+#endif
+void (*phy_capture) (int netif_idx, const char* data, size_t len, int out, int success);
+
 /////////////////////////////////////////////////////////////////////////////
 
 #if UDEBUG && UDEBUGSTORE

tools/sdk/lwip2/include/lwip-git-hash.h

@@ -1,5 +1,5 @@
 // generated by makefiles/make-lwip2-hash
 #ifndef LWIP_HASH_H
 #define LWIP_HASH_H
-#define LWIP_HASH_STR "STABLE-2_0_3_RELEASE/glue:arduino-2.4.1"
+#define LWIP_HASH_STR "STABLE-2_0_3_RELEASE/glue:arduino-2.4.1-7-g2b827f8"
 #endif // LWIP_HASH_H

tools/sdk/lwip2/include/lwipopts.h

@@ -2688,9 +2688,11 @@
  * Return ERR_OK if packet is accepted, any error code otherwise.
  * Payload points to ethernet header!
  */
-#ifdef __DOXYGEN__
-#define LWIP_HOOK_UNKNOWN_ETH_PROTOCOL(pbuf, netif)
-#endif
+//#ifdef __DOXYGEN__
+//#define LWIP_HOOK_UNKNOWN_ETH_PROTOCOL(pbuf, netif)
+//#endif
+#define LWIP_HOOK_UNKNOWN_ETH_PROTOCOL(pbuf, netif) lwip_unhandled_packet((pbuf), (netif))
+
 /**
  * @}
  */
@@ -3003,4 +3005,12 @@
 #include "lwip-git-hash.h"
 #include <sys/time.h> // settimeofday() + struct timeval
 
+// allow to handle special packets (user redefinable)
+struct pbuf;
+struct netif;
+#ifndef LWIP_ERR_T
+#define LWIP_ERR_T s8
+#endif
+LWIP_ERR_T lwip_unhandled_packet (struct pbuf* pbuf, struct netif* netif) __attribute__((weak));
+
 #endif // MYLWIPOPTS_H