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netutils/cmux: Add support for CMUX protocol
This commit adds CMUX (GSM 07.10) protocol support to netutils. CMUX allows multiplexing multiple virtual serial connections over a single physical serial link. Changes include: - CMUX protocol implementation - CRC table for frame validation - Basic frame handling Signed-off-by: Halysson <halysson1007@gmail.com>
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‎include/netutils/cmux.h‎

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/****************************************************************************
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* apps/include/netutils/cmux.h
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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#ifndef __APPS_INCLUDE_NETUTILS_CMUX_H
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#define __APPS_INCLUDE_NETUTILS_CMUX_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <sys/time.h>
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#include <stdbool.h>
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#include <debug.h>
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#include <errno.h>
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/****************************************************************************
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* Public Types
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****************************************************************************/
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struct cmux_settings_s
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{
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FAR const char *tty_name;
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FAR const char *script;
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int total_channels;
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};
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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#undef EXTERN
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#if defined(__cplusplus)
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#define EXTERN extern "C"
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extern "C"
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{
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#else
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#define EXTERN extern
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#endif
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int cmux_create(struct cmux_settings_s *settings);
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#undef EXTERN
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#ifdef __cplusplus
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}
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#endif
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#endif /* __APPS_INCLUDE_NETUTILS_CMUX_H */

‎netutils/cmux/CMakeLists.txt‎

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# ##############################################################################
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# apps/netutils/cmux/CMakeLists.txt
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#
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# SPDX-License-Identifier: Apache-2.0
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#
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# Licensed to the Apache Software Foundation (ASF) under one or more contributor
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# license agreements. See the NOTICE file distributed with this work for
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# additional information regarding copyright ownership. The ASF licenses this
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# file to you under the Apache License, Version 2.0 (the "License"); you may not
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# use this file except in compliance with the License. You may obtain a copy of
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# the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations under
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# the License.
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#
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# ##############################################################################
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if(CONFIG_NETUTILS_CMUX)
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target_sources(apps PRIVATE cmux.c)
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endif()

‎netutils/cmux/Kconfig‎

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

‎netutils/cmux/Make.defs‎

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############################################################################
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# apps/netutils/cmux/Make.defs
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#
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# SPDX-License-Identifier: Apache-2.0
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#
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# Licensed to the Apache Software Foundation (ASF) under one or more
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# contributor license agreements. See the NOTICE file distributed with
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# this work for additional information regarding copyright ownership. The
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# ASF licenses this file to you under the Apache License, Version 2.0 (the
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# "License"); you may not use this file except in compliance with the
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# License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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#
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############################################################################
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ifneq ($(CONFIG_NETUTILS_CMUX),)
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CONFIGURED_APPS += $(APPDIR)/netutils/cmux
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endif

‎netutils/cmux/Makefile‎

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############################################################################
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# apps/netutils/cmux/Makefile
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#
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# SPDX-License-Identifier: Apache-2.0
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#
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# Licensed to the Apache Software Foundation (ASF) under one or more
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# contributor license agreements. See the NOTICE file distributed with
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# this work for additional information regarding copyright ownership. The
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# ASF licenses this file to you under the Apache License, Version 2.0 (the
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# "License"); you may not use this file except in compliance with the
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# License. You may obtain a copy of the License at
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#
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# http:#www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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#
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############################################################################
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include $(APPDIR)/Make.defs
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CSRCS = cmux.c
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include $(APPDIR)/Application.mk

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