diff --git a/builder/libs/lwip.py b/builder/libs/lwip.py
new file mode 100644
index 0000000..c2bafdc
--- /dev/null
+++ b/builder/libs/lwip.py
@@ -0,0 +1,49 @@
+# Copyright (c) Kuba Szczodrzyński 2022-05-18.
+
+from SCons.Script import DefaultEnvironment
+
+env = DefaultEnvironment()
+platform = env.PioPlatform()
+
+
+def env_add_lwip(
+    env,
+    version: str,
+    port: str,
+):
+    # version = env["LIB_LWIP_VERSION"] if "LIB_LWIP_VERSION" in env else version_default
+    package_dir = platform.get_package_dir(f"library-lwip@{version}-{port}")
+    port_srcs = []
+    port_includes = []
+
+    if port in ["amb1"]:
+        port_srcs = [
+            "+<port/realtek/freertos/ethernetif.c>",
+            "+<port/realtek/freertos/sys_arch.c>",
+        ]
+        port_includes = [
+            "+<port/realtek>",
+            "+<port/realtek/freertos>",
+        ]
+
+    env.AddLibrary(
+        name=f"lwip{version}_{port}",
+        base_dir=package_dir,
+        srcs=[
+            "+<src/api/*.c>",
+            "+<src/core/*.c>",
+            "+<src/core/ipv4/*.c>",
+            "+<src/netif/ethernet.c>",  # 2.0.x
+            "+<src/netif/etharp.c>",  # 1.4.x
+            *port_srcs,
+        ],
+        includes=[
+            "+<src/include>",
+            "+<src/include/lwip>",
+            "+<src/include/ipv4>",
+            *port_includes,
+        ],
+    )
+
+
+env.AddMethod(env_add_lwip, "AddLibraryLwIP")
diff --git a/builder/main.py b/builder/main.py
index f07ed14..057f06d 100644
--- a/builder/main.py
+++ b/builder/main.py
@@ -7,6 +7,8 @@ board = env.BoardConfig()
 
 # Utilities
 env.SConscript("utils.py", exports="env")
+# Vendor-specific library ports
+env.SConscript("libs/lwip.py", exports="env")
 
 # Firmware name
 if env.get("PROGNAME", "program") == "program":
diff --git a/platform.json b/platform.json
index 5e8f954..07a7191 100644
--- a/platform.json
+++ b/platform.json
@@ -40,6 +40,14 @@
         "description": "Hardware independent layer of the Arduino cores"
       }
     },
+    "library-lwip": {
+      "type": "framework",
+      "optional": true,
+      "base_url": "https://github.com/libretuya/lwip",
+      "manifest": {
+        "description": "lwIP - A Lightweight TCPIP stack"
+      }
+    },
     "toolchain-gccarmnoneeabi": {
       "type": "toolchain",
       "optionalVersions": [
diff --git a/platform.py b/platform.py
index 6fcccca..fe45386 100644
--- a/platform.py
+++ b/platform.py
@@ -99,6 +99,28 @@ class LibretuyaPlatform(PlatformBase):
         if framework.startswith("realtek-ambz"):
             self.packages["toolchain-gccarmnoneeabi"]["version"] = "~1.50401.0"
 
+        # use appropriate vendor library versions
+        sdk_package_name = self.frameworks[framework]["package"]
+        sdk_package = self.packages[sdk_package_name]
+        sdk_libraries = sdk_package["libraries"] if "libraries" in sdk_package else {}
+        packages_new = {}
+        for name, package in self.packages.items():
+            if not name.startswith("library-"):
+                continue
+            name = name[8:]  # strip "library-"
+            if name not in sdk_libraries:
+                continue
+            lib_version = sdk_libraries[name][-1]  # get latest version tag
+            package = dict(**package)  # clone the base package
+            package["version"] = (
+                package["base_url"] + "#" + lib_version
+            )  # use the specific version
+            package["optional"] = False  # make it required
+            lib_version = lib_version.lstrip("v")  # strip "v" in target name
+            name = f"library-{name}@{lib_version}"
+            packages_new[name] = package  # put the package under a new name
+        self.packages.update(packages_new)
+
         # make ArduinoCore-API required
         if "arduino" in framework:
             self.packages["framework-arduino-api"]["optional"] = False