neutils: add support for cmux protocol.

include/netutils/cmux.h

@@ -0,0 +1,66 @@
+/****************************************************************************
+ * apps/include/netutils/cmux.h
+ *
+ * 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.
+ *
+ ****************************************************************************/
+
+#ifndef __APPS_INCLUDE_NETUTILS_CMUX_H
+#define __APPS_INCLUDE_NETUTILS_CMUX_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <sys/time.h>
+#include <stdbool.h>
+#include <debug.h>
+#include <errno.h>
+
+/****************************************************************************
+ * Public Types
+ ****************************************************************************/
+
+struct cmux_settings_s
+{
+    FAR const char *tty_name;
+    FAR const char *script;
+    int total_channels;
+};
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+#undef EXTERN
+#if defined(__cplusplus)
+#define EXTERN extern "C"
+extern "C"
+{
+#else
+#define EXTERN extern
+#endif
+
+int cmux_create(struct cmux_settings_s *settings);
+
+#undef EXTERN
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __APPS_INCLUDE_NETUTILS_CMUX_H */

netutils/cmux/CMakeLists.txt

@@ -0,0 +1,25 @@
+# ##############################################################################
+# apps/netutils/cmux/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_NETUTILS_CMUX)
+  target_sources(apps PRIVATE cmux.c)
+endif()

netutils/cmux/Kconfig

@@ -0,0 +1,18 @@
+#
+# For a description of the syntax of this configuration file,
+# see the file kconfig-language.txt in the NuttX tools repository.
+#
+
+config NETUTILS_CMUX
+	bool "Cmux tool"
+	default n
+	---help---
+		Enable the CMUX (GSM 07.10) multiplexing protocol utility.
+		CMUX allows multiplexing multiple virtual serial connections
+		over a single physical serial link, commonly used with GSM/LTE
+		modems to simultaneously handle AT commands, data connections,
+		and other communication channels.
+
+if NETUTILS_CMUX
+
+endif # NETUTILS_CMUX

netutils/cmux/Make.defs

@@ -0,0 +1,25 @@
+############################################################################
+# apps/netutils/cmux/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_NETUTILS_CMUX),)
+CONFIGURED_APPS += $(APPDIR)/netutils/cmux
+endif

netutils/cmux/Makefile

@@ -0,0 +1,27 @@
+############################################################################
+# apps/netutils/cmux/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
+
+CSRCS = cmux.c
+
+include $(APPDIR)/Application.mk