diff --git a/arduino/realtek-ambz/cores/arduino/sdk_extern.h b/arduino/realtek-ambz/cores/arduino/sdk_extern.h
index 5e228ee..09ea421 100644
--- a/arduino/realtek-ambz/cores/arduino/sdk_extern.h
+++ b/arduino/realtek-ambz/cores/arduino/sdk_extern.h
@@ -6,7 +6,18 @@
 #include <stddef.h>
 #include <stdint.h>
 
+// disable typedef in basic_types.h
 #define boolean boolean_rtl
+
+#include <strproc.h> // define string macros first
+#undef isdigit		 // then remove them, as they conflict
+#undef islower		 // with ctype.h macros
+#undef isprint
+#undef isspace
+#undef isxdigit
+#undef strtol
+#undef strtoul
+
 #include <ameba_soc.h>
 #include <gpio_api.h>
 #include <main.h>
@@ -14,6 +25,8 @@
 #include <rt_lib_rom.h>
 #include <rtl_lib.h>
 #include <wait_api.h>
+
+// remove previously defined workaround
 #undef boolean
 
 // stdio.h
@@ -36,3 +49,5 @@ extern void wait_us(int us);
 extern int LOGUART_SetBaud(uint32_t BaudRate);	  // from fixups/log_uart.c
 extern void DumpForOneBytes(void *addr, int cnt); // cnt max 0x70!
 extern void SystemCoreClockUpdate(void);
+
+extern int _sscanf_patch(const char *buf, const char *fmt, ...);
diff --git a/builder/frameworks/realtek-ambz-sdk.py b/builder/frameworks/realtek-ambz-sdk.py
index 496b0e9..8b4606d 100644
--- a/builder/frameworks/realtek-ambz-sdk.py
+++ b/builder/frameworks/realtek-ambz-sdk.py
@@ -58,9 +58,14 @@ env.Append(
         "M3",
         "CONFIG_PLATFORM_8711B",
         ("F_CPU", "166000000L"),
+        # LwIP options
         ("LWIP_TIMEVAL_PRIVATE", "0"),
         ("LWIP_NETIF_HOSTNAME", "1"),  # to support hostname changing
         ("LWIP_SO_RCVBUF", "1"),  # for ioctl(FIONREAD)
+        ("ip_addr", "ip4_addr"),  # LwIP 2.0.x compatibility
+        ("ip_addr_t", "ip4_addr_t"),  # LwIP 2.0.x compatibility
+        ("IN_ADDR_T_DEFINED", "1"),
+        ("in_addr_t", "u32_t"),
         ("INT_MAX", "2147483647"),  # for RECV_BUFSIZE_DEFAULT
         ("ERRNO", "1"),  # for LwIP
         ("vprintf", "rtl_vprintf"),
@@ -204,8 +209,8 @@ env.AddLibrary(
     ],
 )
 
-# Sources - lwIP 1.4.1
-env.AddLibraryLwIP(version="1.4.1", port="amb1")
+# Sources - lwIP 2.0.0
+env.AddLibraryLwIP(version="2.0.0", port="amb1")
 
 # Sources - mbedTLS
 env.AddLibrary(
diff --git a/builder/libs/lwip.py b/builder/libs/lwip.py
index c2bafdc..29a40ee 100644
--- a/builder/libs/lwip.py
+++ b/builder/libs/lwip.py
@@ -39,7 +39,6 @@ def env_add_lwip(
         ],
         includes=[
             "+<src/include>",
-            "+<src/include/lwip>",
             "+<src/include/ipv4>",
             *port_includes,
         ],
diff --git a/platform.json b/platform.json
index 1cfcf68..6b976f5 100644
--- a/platform.json
+++ b/platform.json
@@ -33,7 +33,7 @@
       },
       "libraries": {
         "lwip": [
-          "v1.4.1-amb1"
+          "v2.0.0-amb1"
         ]
       }
     },
diff --git a/platform/realtek-ambz/fixups/inc/err.h b/platform/realtek-ambz/fixups/inc/err.h
new file mode 100644
index 0000000..99eb559
--- /dev/null
+++ b/platform/realtek-ambz/fixups/inc/err.h
@@ -0,0 +1,5 @@
+/* Copyright (c) Kuba Szczodrzyński 2022-05-22. */
+
+#pragma once
+
+#include <lwip/err.h>
diff --git a/platform/realtek-ambz/fixups/inc/lwip/lwip_timers.h b/platform/realtek-ambz/fixups/inc/lwip/lwip_timers.h
new file mode 100644
index 0000000..b2a2774
--- /dev/null
+++ b/platform/realtek-ambz/fixups/inc/lwip/lwip_timers.h
@@ -0,0 +1,5 @@
+/* Copyright (c) Kuba Szczodrzyński 2022-05-22. */
+
+#pragma once
+
+#include <lwip/timeouts.h>
diff --git a/platform/realtek-ambz/fixups/inc/lwipopts.h b/platform/realtek-ambz/fixups/inc/lwipopts.h
index b99225a..aae0b09 100644
--- a/platform/realtek-ambz/fixups/inc/lwipopts.h
+++ b/platform/realtek-ambz/fixups/inc/lwipopts.h
@@ -41,7 +41,10 @@
 
 /* Define LWIP_COMPAT_MUTEX if the port has no mutexes and binary semaphores
  should be used instead */
-#define LWIP_COMPAT_MUTEX       1
+#define LWIP_COMPAT_MUTEX         1
+#define LWIP_COMPAT_MUTEX_ALLOWED 1
+
+#define LWIP_TCPIP_TIMEOUT      1
 
 #define ETHARP_TRUST_IP_MAC     0
 #define IP_REASSEMBLY           1
diff --git a/platform/realtek-ambz/fixups/inc/platform_opts.h b/platform/realtek-ambz/fixups/inc/platform_opts.h
index 0831f7b..a2d6d16 100644
--- a/platform/realtek-ambz/fixups/inc/platform_opts.h
+++ b/platform/realtek-ambz/fixups/inc/platform_opts.h
@@ -1,6 +1,7 @@
 // CHANGES:
 // - 2022-05-08 change CONFIG_USE_POLARSSL to CONFIG_USE_MBEDTLS
 // - 2022-05-08 use static int errno
+// - 2022-05-18 include lwip/init.h
 
 
 /**
@@ -22,6 +23,7 @@
 #undef errno // undefine __errno() macro
 extern int errno; // use a static errno
 
+#include <lwip/init.h>
 
 /*For MP mode setting*/
 //#define SUPPORT_MP_MODE		1
diff --git a/platform/realtek-ambz/fixups/inc/sockets.h b/platform/realtek-ambz/fixups/inc/sockets.h
new file mode 100644
index 0000000..3f34b76
--- /dev/null
+++ b/platform/realtek-ambz/fixups/inc/sockets.h
@@ -0,0 +1,5 @@
+/* Copyright (c) Kuba Szczodrzyński 2022-05-23. */
+
+#pragma once
+
+#include <lwip/sockets.h>
diff --git a/platform/realtek-ambz/fixups/inc/sys.h b/platform/realtek-ambz/fixups/inc/sys.h
new file mode 100644
index 0000000..7a8cd6d
--- /dev/null
+++ b/platform/realtek-ambz/fixups/inc/sys.h
@@ -0,0 +1,5 @@
+/* Copyright (c) Kuba Szczodrzyński 2022-05-22. */
+
+#pragma once
+
+#include <lwip/sys.h>
diff --git a/platform/realtek-ambz/fixups/inc/tcpip.h b/platform/realtek-ambz/fixups/inc/tcpip.h
new file mode 100644
index 0000000..9809214
--- /dev/null
+++ b/platform/realtek-ambz/fixups/inc/tcpip.h
@@ -0,0 +1,5 @@
+/* Copyright (c) Kuba Szczodrzyński 2022-05-22. */
+
+#pragma once
+
+#include <lwip/tcpip.h>
diff --git a/platform/realtek-ambz/fixups/inc/udp.h b/platform/realtek-ambz/fixups/inc/udp.h
new file mode 100644
index 0000000..70524e9
--- /dev/null
+++ b/platform/realtek-ambz/fixups/inc/udp.h
@@ -0,0 +1,10 @@
+/* Copyright (c) Kuba Szczodrzyński 2022-05-23. */
+
+#pragma once
+
+#include <lwip/udp.h>
+
+// this is included only by wifi_simple_config.c
+// which uses lwip_ntohl without parentheses
+// so the #define from lwip/def.h doesn't work
+#define lwip_ntohl lwip_htonl