netutils/libwebsockets: Remove hard-dependency on mbedTLS and enable websoket server

examples/lws_echo/CMakeLists.txt

@@ -0,0 +1,37 @@
+# ##############################################################################
+# apps/examples/lws_echo/CMakeLists.txt
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more contributor
+# license agreements.  See the NOTICE file distributed with this work for
+# additional information regarding copyright ownership.  The ASF licenses this
+# file to you 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.
+#
+# ##############################################################################
+
+if(CONFIG_EXAMPLES_LWS_ECHO)
+  nuttx_add_application(
+    NAME
+    ${CONFIG_EXAMPLES_LWS_ECHO_PROGNAME}
+    PRIORITY
+    ${CONFIG_EXAMPLES_LWS_ECHO_PRIORITY}
+    STACKSIZE
+    ${CONFIG_EXAMPLES_LWS_ECHO_STACKSIZE}
+    MODULE
+    ${CONFIG_EXAMPLES_LWS_ECHO}
+    DEPENDS
+    libwebsockets
+    SRCS
+    lws_echo_main.c)
+endif()

examples/lws_echo/Kconfig

@@ -0,0 +1,31 @@
+#
+# For a description of the syntax of this configuration file,
+# see the file kconfig-language.txt in the NuttX tools repository.
+#
+
+config EXAMPLES_LWS_ECHO
+	tristate "libwebsockets WebSocket echo server"
+	default n
+	depends on NETUTILS_LIBWEBSOCKETS && NETUTILS_LIBWEBSOCKETS_SERVER
+	---help---
+		Simple WebSocket echo server using libwebsockets without TLS.
+
+if EXAMPLES_LWS_ECHO
+
+config EXAMPLES_LWS_ECHO_PROGNAME
+	string "Program name"
+	default "lws_echo"
+
+config EXAMPLES_LWS_ECHO_PRIORITY
+	int "Task priority"
+	default 100
+
+config EXAMPLES_LWS_ECHO_STACKSIZE
+	int "Stack size"
+	default 16384
+
+config EXAMPLES_LWS_ECHO_PORT
+	int "WebSocket server TCP port"
+	default 9000
+
+endif

examples/lws_echo/Make.defs

@@ -0,0 +1,25 @@
+############################################################################
+# apps/examples/lws_echo/Make.defs
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.  The
+# ASF licenses this file to you 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.
+#
+############################################################################
+
+ifneq ($(CONFIG_EXAMPLES_LWS_ECHO),)
+CONFIGURED_APPS += $(APPDIR)/examples/lws_echo
+endif

examples/lws_echo/Makefile

@@ -0,0 +1,32 @@
+############################################################################
+# apps/examples/lws_echo/Makefile
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.  The
+# ASF licenses this file to you 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.
+#
+############################################################################
+
+include $(APPDIR)/Make.defs
+
+PROGNAME  = $(CONFIG_EXAMPLES_LWS_ECHO_PROGNAME)
+PRIORITY  = $(CONFIG_EXAMPLES_LWS_ECHO_PRIORITY)
+STACKSIZE = $(CONFIG_EXAMPLES_LWS_ECHO_STACKSIZE)
+MODULE    = $(CONFIG_EXAMPLES_LWS_ECHO)
+
+MAINSRC = lws_echo_main.c
+
+include $(APPDIR)/Application.mk

examples/lws_echo/lws_echo_main.c

@@ -0,0 +1,203 @@
+/****************************************************************************
+ * apps/examples/lws_echo/lws_echo_main.c
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you 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.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <libwebsockets.h>
+#include <stdio.h>
+#include <string.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+#ifndef CONFIG_EXAMPLES_LWS_ECHO_PORT
+#  define CONFIG_EXAMPLES_LWS_ECHO_PORT 9000
+#endif
+
+#define LWS_ECHO_IOBUF_SIZE 256
+
+/****************************************************************************
+ * Private Types
+ ****************************************************************************/
+
+struct lws_echo_session_s
+{
+  unsigned char buf[LWS_PRE + LWS_ECHO_IOBUF_SIZE];
+  size_t len;
+  int pending;
+};
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+static int callback_echo(struct lws *wsi,
+                         enum lws_callback_reasons reason,
+                         void *user, void *in, size_t len);
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+static const struct lws_protocols g_protocols[] =
+{
+  {
+    "echo-protocol",
+    callback_echo,
+    sizeof(struct lws_echo_session_s),
+    LWS_ECHO_IOBUF_SIZE,
+    0, NULL, 0
+  },
+  LWS_PROTOCOL_LIST_TERM
+};
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: callback_echo
+ *
+ * Description:
+ *   libwebsockets protocol callback for the echo server.
+ *
+ * Input Parameters:
+ *   wsi    - Websocket instance.
+ *   reason - Callback reason.
+ *   user   - Per-session data.
+ *   in     - Received data.
+ *   len    - Length of received data.
+ *
+ * Returned Value:
+ *   Zero on success; non-zero on failure.
+ *
+ ****************************************************************************/
+
+static int callback_echo(struct lws *wsi,
+                         enum lws_callback_reasons reason,
+                         void *user, void *in, size_t len)
+{
+  struct lws_echo_session_s *pss = (struct lws_echo_session_s *)user;
+
+  switch (reason)
+    {
+    case LWS_CALLBACK_ESTABLISHED:
+      printf("lws_echo: client connected\n");
+      pss->pending = 0;
+      break;
+
+    case LWS_CALLBACK_RECEIVE:
+      if (len > sizeof(pss->buf) - LWS_PRE)
+        {
+          len = sizeof(pss->buf) - LWS_PRE;
+        }
+
+      memcpy(&pss->buf[LWS_PRE], in, len);
+      pss->len = len;
+      pss->pending = 1;
+      lws_callback_on_writable(wsi);
+      break;
+
+    case LWS_CALLBACK_SERVER_WRITEABLE:
+      if (!pss->pending)
+        {
+          break;
+        }
+
+      lws_write(wsi, &pss->buf[LWS_PRE], pss->len, LWS_WRITE_TEXT);
+      pss->pending = 0;
+      break;
+
+    case LWS_CALLBACK_CLOSED:
+      printf("lws_echo: client disconnected\n");
+      break;
+
+    default:
+      break;
+    }
+
+  return 0;
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: main
+ *
+ * Description:
+ *   Start a libwebsockets WebSocket echo server.
+ *
+ * Input Parameters:
+ *   Standard argc and argv.
+ *
+ * Returned Value:
+ *   Zero on success; non-zero on failure.
+ *
+ ****************************************************************************/
+
+int main(int argc, FAR char *argv[])
+{
+  struct lws_context_creation_info info;
+  struct lws_context *context;
+  int n;
+
+  lws_set_log_level(LLL_USER | LLL_ERR | LLL_WARN | LLL_NOTICE, NULL);
+
+  printf("lws_echo: starting WebSocket echo server on port %d\n",
+         CONFIG_EXAMPLES_LWS_ECHO_PORT);
+  printf("lws_echo: connect with ws://<device-ip>:%d "
+         "(subprotocol echo-protocol)\n",
+         CONFIG_EXAMPLES_LWS_ECHO_PORT);
+
+  memset(&info, 0, sizeof(info));
+  info.port = CONFIG_EXAMPLES_LWS_ECHO_PORT;
+  info.protocols = g_protocols;
+  info.vhost_name = "localhost";
+  info.options = 0;
+
+  context = lws_create_context(&info);
+  if (context == NULL)
+    {
+      printf("lws_echo: ERROR creating context\n");
+      return 1;
+    }
+
+  printf("lws_echo: server running\n");
+
+  n = 0;
+  while (n >= 0)
+    {
+      n = lws_service(context, 100);
+    }
+
+  lws_context_destroy(context);
+  printf("lws_echo: server stopped\n");
+
+  return 0;
+}