examples/xedge: Add Xedge example with BAS integration

examples/xedge_demo/Kconfig

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+#
+# For a description of the syntax of this configuration file,
+# see the file kconfig-language.txt in the NuttX tools repository.
+#
+
+config EXAMPLES_XEDGE_DEMO
+	tristate "Xedge IoT Toolkit Demo"
+	depends on NETUTILS_XEDGE && ALLOW_GPL_COMPONENTS
+	default n
+	---help---
+		Simple demonstration of the Xedge IoT Toolkit library.
+
+		This example shows how to integrate and use the Xedge library
+		in your NuttX application. Xedge provides a high-level development
+		environment for creating IoT and industrial device applications
+		using Lua scripting with access to HTTP(S), WebSockets, MQTT,
+		file system, and device I/O.
+
+		Note: This example requires the NETUTILS_XEDGE library to be enabled.
+
+if EXAMPLES_XEDGE_DEMO
+
+config EXAMPLES_XEDGE_DEMO_PROGNAME
+	string "Program name"
+	default "xedge_demo"
+	---help---
+		This is the name of the ELF executable for the Xedge demo application in NSH.
+
+config EXAMPLES_XEDGE_DEMO_PRIORITY
+	int "Xedge demo task priority"
+	default 100
+	---help---
+		Set the task priority for the Xedge demo application.
+
+config EXAMPLES_XEDGE_DEMO_STACKSIZE
+	int "Xedge demo stack size"
+	default 20000
+	---help---
+		Set the stack size for the Xedge demo application.
+
+endif

examples/xedge_demo/Make.defs

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+############################################################################
+# apps/examples/xedge_demo/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_XEDGE_DEMO),)
+CONFIGURED_APPS += $(APPDIR)/examples/xedge_demo
+endif

examples/xedge_demo/Makefile

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+# ##############################################################################
+# apps/examples/xedge_demo/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.
+#
+# ##############################################################################
+
+
+include $(APPDIR)/Make.defs
+
+PROGNAME  = $(CONFIG_EXAMPLES_XEDGE_DEMO_PROGNAME)
+PRIORITY  = $(CONFIG_EXAMPLES_XEDGE_DEMO_PRIORITY)
+STACKSIZE = $(CONFIG_EXAMPLES_XEDGE_DEMO_STACKSIZE)
+MODULE    = $(CONFIG_EXAMPLES_XEDGE_DEMO)
+
+MAINSRC = xedge_main.c
+
+include $(APPDIR)/Application.mk

examples/xedge_demo/xedge_main.c

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+/***************************************************************************
+ * apps/examples/xedge_demo/xedge_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.
+ *
+ ***************************************************************************/
+
+/* Xedge NuttX Startup Code (may need adjustments)
+ *
+ * Additional License Note: Xedge, based on the Barracuda
+ * App Server, uses the license options explained here:
+ * https://github.com/RealTimeLogic/BAS#license
+ * This repo does not include Xedge and the Barracuda App Server
+ * library and must be downloaded separately. The dependencies
+ * are automatically downloaded in apps/netutils/xedge/.
+ */
+
+/***************************************************************************
+ * Included Files
+ ***************************************************************************/
+
+#include <nuttx/config.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <signal.h>
+#include <syslog.h>
+#include <pthread.h>
+#include <netutils/ntpclient.h>
+#include <HttpTrace.h>
+#include <BaDiskIo.h>
+#include <BaServerLib.h>
+#include "../../netutils/xedge/BAS/examples/xedge/src/xedge.h"
+
+/***************************************************************************
+ * Pre-processor Definitions
+ ***************************************************************************/
+
+/* The code uses identifiers from the third-party Barracuda App Server
+ * library, which follows a camelCase naming style:
+ * https://realtimelogic.com/ba/doc/en/C/introduction.html#oo_c
+ * These identifiers are used directly and will trigger "Mixed Case"
+ * warnings in tools like nxstyle, which are safe to ignore in this case.
+ */
+
+/***************************************************************************
+ * Private Data
+ ***************************************************************************/
+
+static int running = FALSE; /* Running mode: 2 running, 1 exiting, 0 stopped */
+
+/* BAS is configured to use dlmalloc for NuttX. This is the pool.
+ * 2M : recommended minimum
+ */
+
+static char poolbuf[2 * 1024 * 1024];
+
+extern LThreadMgr ltMgr; /* The LThreadMgr configured in xedge.c */
+
+/***************************************************************************
+ * External Function Prototypes
+ ***************************************************************************/
+
+/* barracuda(): BAS/examples/xedge/src/xedge.c */
+
+extern void barracuda(void);
+extern void init_dlmalloc(char *heapstart, char *heapend); /* dlmalloc.c */
+extern int (*platformInitDiskIo)(DiskIo *io);              /* xedge.c */
+
+/***************************************************************************
+ * Private Functions
+ ***************************************************************************/
+
+/* The following two functions are copied from the example:
+ * https://github.com/RealTimeLogic/BAS/blob/main/examples/xedge/src/led.c
+ * Details:
+ * https://realtimelogic.com/ba/examples/xedge/readme.html#time
+ */
+
+/* This callback is called by one of the threads managed by LThreadMgr
+ * when a job is taken off the queue and executed. The callback
+ * attempts to find the global Lua function '_XedgeEvent', and if the
+ * function is found, it will be executed as follows: _XedgeEvent("sntp")
+ */
+
+static void execevent(ThreadJob *job, int msgh, LThreadMgr *mgr)
+{
+  lua_State *L = job->Lt;
+  lua_pushglobaltable(L);
+  lua_getfield(L, -1, "_XedgeEvent");
+
+  if (lua_isfunction(L, -1))
+    {
+      lua_pushstring(L, "sntp");
+      lua_pcall(L, 1, 0, msgh);
+    }
+}
+
+/* Thread started by xedgeOpenAUX() */
+
+static void *checktimethread(void *arg)
+{
+  ThreadMutex *dm = HttpServer_getMutex(ltMgr.server);
+  const char *d = __DATE__;
+  char buf[50];
+
+  (void)arg;
+
+  if (!(basnprintf(buf, sizeof(buf), "Mon, %c%c %c%c%c %s %s",
+                   d[4], d[5], d[0], d[1], d[2], d + 7, __TIME__) < 0))
+    {
+      BaTime t = baParseDate(buf);
+      if (t)
+        {
+          t -= 24 * 60 * 60;
+          while (baGetUnixTime() < t)
+            {
+              Thread_sleep(500);
+            }
+
+          ThreadJob *job = ThreadJob_lcreate(sizeof(ThreadJob), execevent);
+          ThreadMutex_set(dm);
+          LThreadMgr_run(&ltMgr, job);
+          ThreadMutex_release(dm);
+        }
+    }
+
+  return NULL;
+}
+
+static void panic(BaFatalErrorCodes ecode1,
+                         unsigned int ecode2,
+                         const char *file,
+                         int line)
+{
+  syslog(LOG_ERR, "Fatal error in Barracuda %d %d %s %d\n",
+         ecode1, ecode2, file, line);
+  exit(1);
+}
+
+/* Redirect server's HttpTrace to syslog.
+ * https://realtimelogic.com/ba/doc/en/C/reference/html/structHttpTrace.html
+ */
+
+static void flushtrace(char *buf, int buflen)
+{
+  buf[buflen] = 0;
+  syslog(LOG_INFO, "%s", buf);
+}
+
+static void sighandler(int signo)
+{
+  if (running)
+    {
+      printf("\nGot SIGTERM; exiting...\n");
+      setDispExit();
+
+      /* NuttX feature: Must wait for socket select() to return */
+
+      Thread_sleep(2000);
+    }
+}
+
+/***************************************************************************
+ * Public Functions
+ ***************************************************************************/
+
+/* xedge.c calls this to initialize the IO.
+ * Change "/mnt/lfs" to your preference.
+ */
+
+int xedgeInitDiskIo(DiskIo *io)
+{
+  if (DiskIo_setRootDir(io, "/mnt/lfs"))
+    {
+      syslog(LOG_ERR, "Error: cannot set root to /mnt/lfs\n");
+      return -1;
+    }
+
+  return 0;
+}
+
+/* xedge.c calls this; include your Lua bindings here.
+ * Tutorial: https://tutorial.realtimelogic.com/Lua-Bindings.lsp
+ */
+
+int xedgeOpenAUX(XedgeOpenAUX *aux)
+{
+  pthread_t thread;
+  pthread_attr_t attr;
+  struct sched_param param;
+
+  (void)aux;
+
+  pthread_attr_init(&attr);
+  pthread_attr_setstacksize(&attr, 4096);
+  param.sched_priority = SCHED_PRIORITY_DEFAULT;
+  pthread_attr_setschedparam(&attr, &param);
+  pthread_create(&thread, &attr, checktimethread, NULL);
+
+  return 0;
+}
+
+int main(int argc, FAR char *argv[])
+{
+  if (running)
+    {
+      printf("Already running!\n");
+      return 1;
+    }
+
+  signal(SIGINT, sighandler);
+  signal(SIGTERM, sighandler);
+
+  ntpc_start();
+  init_dlmalloc(poolbuf, poolbuf + sizeof(poolbuf));
+  HttpTrace_setFLushCallback(flushtrace);
+  HttpServer_setErrHnd(panic);
+
+  running = TRUE;
+  barracuda();
+  running = FALSE;
+
+  printf("Exiting Xedge\n");
+  return 0;
+}

netutils/xedge/.gitignore

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+/BAS
+/BAS-Resources
+/*.o

netutils/xedge/Kconfig

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+#
+# For a description of the syntax of this configuration file,
+# see the file kconfig-language.txt in the NuttX tools repository.
+#
+
+config NETUTILS_XEDGE
+	tristate "Xedge IoT Toolkit Dependencies"
+	depends on ALLOW_GPL_COMPONENTS
+	default n
+	---help---
+		Download and prepare Xedge IoT Toolkit dependencies (BAS and BAS-Resources).
+
+		Xedge is an embedded software toolkit designed to enable high-level developers
+		(e.g., web and Lua programmers) to create sophisticated, secure IoT and industrial
+		device applications. It abstracts low-level embedded development through a lightweight
+		runtime built on top of the Barracuda App Server and Lua.
+
+		This option will download the required Barracuda App Server and BAS-Resources
+		repositories during the build process, making them available for applications
+		that want to use Xedge.
+
+		After enabling this, you can use the examples/xedge_demo as a reference
+		for integrating Xedge into your own applications.