freemodbus: fix port contains lgpl licensed files

Initial version of freemodbus master port files have been added to ESP-IDF based on https://github.com/armink/FreeModbus_Slave-Master-RTT-STM32.
The overall repository license, at the time of adding these files, has been BSD 3-clause. However at that time, several port files carried LGPL license headers. As the author of these files confirmed in https://github.com/armink/FreeModbus_Slave-Master-RTT-STM32/issues/61#issuecomment-977828450, this wasn't intentional. ESP-IDF version of modbus master port has been rewritten to target FreeRTOS instead of RT-Thread, but the license headers remained from the original version. This commit corrects this, replacing the license of these files with BSD 3-clause.

components/freemodbus/modbus/functions/mbfuncdisc.c

@@ -1,21 +1,38 @@
- /*
-  * FreeRTOS Modbus Libary: A Modbus serial implementation for FreeRTOS
-  * Copyright (C) 2006 Christian Walter <wolti@sil.at>
-  *
-  * This library is free software; you can redistribute it and/or
-  * modify it under the terms of the GNU Lesser General Public
-  * License as published by the Free Software Foundation; either
-  * version 2.1 of the License, or (at your option) any later version.
-  *
-  * This library is distributed in the hope that it will be useful,
-  * but WITHOUT ANY WARRANTY; without even the implied warranty of
-  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-  * Lesser General Public License for more details.
-  *
-  * You should have received a copy of the GNU Lesser General Public
-  * License along with this library; if not, write to the Free Software
-  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
-  */
+/*
+ * SPDX-FileCopyrightText: 2006 Christian Walter
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ * SPDX-FileContributor: 2016-2021 Espressif Systems (Shanghai) CO LTD
+ */
+/*
+ * FreeRTOS Modbus Libary: A Modbus serial implementation for FreeRTOS
+ * Copyright (C) 2006 Christian Walter <wolti@sil.at>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * IF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * File: $Id: mbfuncdisc.c,v 1.10 2007/09/12 10:15:56 wolti Exp $
+ */
 
 /* ----------------------- System includes ----------------------------------*/
 #include "stdlib.h"

components/freemodbus/port/port.c

@@ -1,37 +1,38 @@
-/* Copyright 2018 Espressif Systems (Shanghai) PTE LTD
- *
- * Licensed 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
+/*
+ * SPDX-FileCopyrightText: 2013 Armink
  *
- *     http://www.apache.org/licenses/LICENSE-2.0
+ * SPDX-License-Identifier: BSD-3-Clause
  *
- * 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.
+ * SPDX-FileContributor: 2016-2021 Espressif Systems (Shanghai) CO LTD
  */
 /*
-  * FreeModbus Libary: RT-Thread Port
-  * Copyright (C) 2013 Armink <armink.ztl@gmail.com>
-  *
-  * This library is free software; you can redistribute it and/or
-  * modify it under the terms of the GNU Lesser General Public
-  * License as published by the Free Software Foundation; either
-  * version 2.1 of the License, or (at your option) any later version.
-  *
-  * This library is distributed in the hope that it will be useful,
-  * but WITHOUT ANY WARRANTY; without even the implied warranty of
-  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-  * Lesser General Public License for more details.
-  *
-  * You should have received a copy of the GNU Lesser General Public
-  * License along with this library; if not, write to the Free Software
-  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
-  *
-  * File: $Id: port.c,v 1.60 2015/02/01 9:18:05 Armink $
-  */
+ * FreeModbus Libary: ESP32 Port
+ * Copyright (C) 2013 Armink <armink.ztl@gmail.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * IF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * File: $Id: port.c,v 1.60 2015/02/01 9:18:05 Armink $
+ */
 
 /* ----------------------- System includes --------------------------------*/
 

components/freemodbus/port/port.h

@@ -1,16 +1,37 @@
-/* Copyright 2018 Espressif Systems (Shanghai) PTE LTD
+/*
+ * SPDX-FileCopyrightText: 2010 Christian Walter
  *
- * Licensed 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
+ * SPDX-License-Identifier: BSD-3-Clause
  *
- *     http://www.apache.org/licenses/LICENSE-2.0
+ * SPDX-FileContributor: 2016-2021 Espressif Systems (Shanghai) CO LTD
+ */
+/*
+ * FreeModbus Libary: ESP32 Port
+ * Copyright (C) 2010 Christian Walter <cwalter@embedded-solutions.at>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * IF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
- * 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.
+ * File: $Id: port.h,v 1.1 2010/06/06 13:07:20 wolti Exp $
  */
 
 #ifndef PORT_COMMON_H_

components/freemodbus/port/portevent_m.c

@@ -1,34 +1,35 @@
-/* Copyright 2018 Espressif Systems (Shanghai) PTE LTD
- *
- * Licensed 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
+/*
+ * SPDX-FileCopyrightText: 2013 Armink
  *
- *     http://www.apache.org/licenses/LICENSE-2.0
+ * SPDX-License-Identifier: BSD-3-Clause
  *
- * 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.
+ * SPDX-FileContributor: 2016-2021 Espressif Systems (Shanghai) CO LTD
  */
 /*
- * FreeModbus Libary: ESP32 Port Demo Application
+ * FreeModbus Libary: ESP32 Port
  * Copyright (C) 2013 Armink <armink.ztl@gmail.com>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
  *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * IF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  * File: $Id: portevent.c v 1.60 2013/08/13 15:07:05 Armink add Master Functions$
  */

components/freemodbus/port/portserial.c

@@ -13,10 +13,9 @@
  * limitations under the License.
  */
 /*
- * FreeModbus Libary: ESP32 Port Demo Application
+ * FreeModbus Libary: ESP32 Port
  * Copyright (C) 2010 Christian Walter <cwalter@embedded-solutions.at>
  *
- *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:

components/freemodbus/port/portserial_m.c

@@ -1,34 +1,35 @@
-/* Copyright 2018 Espressif Systems (Shanghai) PTE LTD
- *
- * Licensed 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
+/*
+ * SPDX-FileCopyrightText: 2013 Armink
  *
- *     http://www.apache.org/licenses/LICENSE-2.0
+ * SPDX-License-Identifier: BSD-3-Clause
  *
- * 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.
+ * SPDX-FileContributor: 2016-2021 Espressif Systems (Shanghai) CO LTD
  */
 /*
- * FreeModbus Libary: ESP32 Port Demo Application
+ * FreeModbus Libary: ESP32 Port
  * Copyright (C) 2013 Armink <armink.ztl@gmail.com>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
  *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * IF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  * File: $Id: portserial.c,v 1.60 2013/08/13 15:07:05 Armink add Master Functions $
  */

components/freemodbus/port/porttimer_m.c

@@ -1,34 +1,35 @@
-/* Copyright 2018 Espressif Systems (Shanghai) PTE LTD
- *
- * Licensed 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
+/*
+ * SPDX-FileCopyrightText: 2013 Armink
  *
- *     http://www.apache.org/licenses/LICENSE-2.0
+ * SPDX-License-Identifier: BSD-3-Clause
  *
- * 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.
+ * SPDX-FileContributor: 2016-2021 Espressif Systems (Shanghai) CO LTD
  */
 /*
- * FreeModbus Libary: ESP32 Port Demo Application
+ * FreeModbus Libary: ESP32 Port
  * Copyright (C) 2013 Armink <armink.ztl@gmail.com>
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
  *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * IF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  * File: $Id: porttimer_m.c,v 1.60 2013/08/13 15:07:05 Armink add Master Functions$
  */

components/freemodbus/tcp_master/port/port_tcp_master.c

@@ -1,38 +1,39 @@
-/* Copyright 2018 Espressif Systems (Shanghai) PTE LTD
- *
- * Licensed 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
+/*
+ * SPDX-FileCopyrightText: 2006 Christian Walter
  *
- *     http://www.apache.org/licenses/LICENSE-2.0
+ * SPDX-License-Identifier: BSD-3-Clause
  *
- * 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.
-*/
+ * SPDX-FileContributor: 2016-2021 Espressif Systems (Shanghai) CO LTD
+ */
 /*
-  * FreeModbus Libary: ESP32 TCP Port
-  * Copyright (C) 2006 Christian Walter <wolti@sil.at>
-  * Parts of crt0.S Copyright (c) 1995, 1996, 1998 Cygnus Support
-  *
-  * This library is free software; you can redistribute it and/or
-  * modify it under the terms of the GNU Lesser General Public
-  * License as published by the Free Software Foundation; either
-  * version 2.1 of the License, or (at your option) any later version.
-  *
-  * This library is distributed in the hope that it will be useful,
-  * but WITHOUT ANY WARRANTY; without even the implied warranty of
-  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-  * Lesser General Public License for more details.
-  *
-  * You should have received a copy of the GNU Lesser General Public
-  * License along with this library; if not, write to the Free Software
-  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
-  *
-  * File: $Id: port.h,v 1.2 2006/09/04 14:39:20 wolti Exp $
-  */
+ * FreeModbus Libary: ESP32 TCP Port
+ * Copyright (C) 2006 Christian Walter <wolti@sil.at>
+ * Parts of crt0.S Copyright (c) 1995, 1996, 1998 Cygnus Support
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * IF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * File: $Id: port.c,v 1.2 2006/09/04 14:39:20 wolti Exp $
+ */
 
 /* ----------------------- System includes ----------------------------------*/
 #include <stdio.h>

components/freemodbus/tcp_master/port/port_tcp_master.h

@@ -1,38 +1,39 @@
- /* Copyright 2018 Espressif Systems (Shanghai) PTE LTD
+/*
+ * SPDX-FileCopyrightText: 2006 Christian Walter
  *
- * Licensed 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
+ * SPDX-License-Identifier: BSD-3-Clause
  *
- *     http://www.apache.org/licenses/LICENSE-2.0
+ * SPDX-FileContributor: 2016-2021 Espressif Systems (Shanghai) CO LTD
+ */
+/*
+ * FreeModbus Libary: ESP32 TCP Port
+ * Copyright (C) 2006 Christian Walter <wolti@sil.at>
+ * Parts of crt0.S Copyright (c) 1995, 1996, 1998 Cygnus Support
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
  *
- * 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.
-*/
- /*
-  * FreeModbus Libary: ESP32 TCP Port
-  * Copyright (C) 2006 Christian Walter <wolti@sil.at>
-  * Parts of crt0.S Copyright (c) 1995, 1996, 1998 Cygnus Support
-  *
-  * This library is free software; you can redistribute it and/or
-  * modify it under the terms of the GNU Lesser General Public
-  * License as published by the Free Software Foundation; either
-  * version 2.1 of the License, or (at your option) any later version.
-  *
-  * This library is distributed in the hope that it will be useful,
-  * but WITHOUT ANY WARRANTY; without even the implied warranty of
-  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-  * Lesser General Public License for more details.
-  *
-  * You should have received a copy of the GNU Lesser General Public
-  * License along with this library; if not, write to the Free Software
-  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
-  *
-  * File: $Id: port.h,v 1.2 2006/09/04 14:39:20 wolti Exp $
-  */
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * IF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * File: $Id: port.h,v 1.2 2006/09/04 14:39:20 wolti Exp $
+ */
 
 #ifndef _PORT_TCP_SLAVE_H
 #define _PORT_TCP_SLAVE_H

components/freemodbus/tcp_slave/port/port_tcp_slave.c

@@ -1,38 +1,39 @@
-/* Copyright 2018 Espressif Systems (Shanghai) PTE LTD
- *
- * Licensed 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
+/*
+ * SPDX-FileCopyrightText: 2006 Christian Walter
  *
- *     http://www.apache.org/licenses/LICENSE-2.0
+ * SPDX-License-Identifier: BSD-3-Clause
  *
- * 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.
-*/
+ * SPDX-FileContributor: 2016-2021 Espressif Systems (Shanghai) CO LTD
+ */
 /*
-  * FreeModbus Libary: ESP32 TCP Port
-  * Copyright (C) 2006 Christian Walter <wolti@sil.at>
-  * Parts of crt0.S Copyright (c) 1995, 1996, 1998 Cygnus Support
-  *
-  * This library is free software; you can redistribute it and/or
-  * modify it under the terms of the GNU Lesser General Public
-  * License as published by the Free Software Foundation; either
-  * version 2.1 of the License, or (at your option) any later version.
-  *
-  * This library is distributed in the hope that it will be useful,
-  * but WITHOUT ANY WARRANTY; without even the implied warranty of
-  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-  * Lesser General Public License for more details.
-  *
-  * You should have received a copy of the GNU Lesser General Public
-  * License along with this library; if not, write to the Free Software
-  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
-  *
-  * File: $Id: port.h,v 1.2 2006/09/04 14:39:20 wolti Exp $
-  */
+ * FreeModbus Libary: ESP32 TCP Port
+ * Copyright (C) 2006 Christian Walter <wolti@sil.at>
+ * Parts of crt0.S Copyright (c) 1995, 1996, 1998 Cygnus Support
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * IF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * File: $Id: port.c,v 1.2 2006/09/04 14:39:20 wolti Exp $
+ */
 
 /* ----------------------- System includes ----------------------------------*/
 #include <stdio.h>

components/freemodbus/tcp_slave/port/port_tcp_slave.h

@@ -1,38 +1,39 @@
- /* Copyright 2018 Espressif Systems (Shanghai) PTE LTD
+/*
+ * SPDX-FileCopyrightText: 2006 Christian Walter
  *
- * Licensed 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
+ * SPDX-License-Identifier: BSD-3-Clause
  *
- *     http://www.apache.org/licenses/LICENSE-2.0
+ * SPDX-FileContributor: 2016-2021 Espressif Systems (Shanghai) CO LTD
+ */
+/*
+ * FreeModbus Libary: ESP32 TCP Port
+ * Copyright (C) 2006 Christian Walter <wolti@sil.at>
+ * Parts of crt0.S Copyright (c) 1995, 1996, 1998 Cygnus Support
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
  *
- * 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.
-*/
- /*
-  * FreeModbus Libary: ESP32 TCP Port
-  * Copyright (C) 2006 Christian Walter <wolti@sil.at>
-  * Parts of crt0.S Copyright (c) 1995, 1996, 1998 Cygnus Support
-  *
-  * This library is free software; you can redistribute it and/or
-  * modify it under the terms of the GNU Lesser General Public
-  * License as published by the Free Software Foundation; either
-  * version 2.1 of the License, or (at your option) any later version.
-  *
-  * This library is distributed in the hope that it will be useful,
-  * but WITHOUT ANY WARRANTY; without even the implied warranty of
-  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-  * Lesser General Public License for more details.
-  *
-  * You should have received a copy of the GNU Lesser General Public
-  * License along with this library; if not, write to the Free Software
-  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
-  *
-  * File: $Id: port.h,v 1.2 2006/09/04 14:39:20 wolti Exp $
-  */
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * IF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * File: $Id: port.h,v 1.2 2006/09/04 14:39:20 wolti Exp $
+ */
 
 #ifndef _PORT_TCP_SLAVE_H
 #define _PORT_TCP_SLAVE_H

docs/en/COPYRIGHT.rst

@@ -73,6 +73,8 @@ These third party libraries can be included into the application (firmware) prod
 
 * :component_file:`UBSAN runtime <esp_system/ubsan.c>` — Copyright (c) 2016, Linaro Limited and Jiří Zárevúcky, licensed under the BSD 2-clause license.
 
+* `freemodbus`_ Copyright (c) 2006-2013 Christian Walter, Armink and licensed under the BSD license.
+
 Build Tools
 -----------
 
@@ -186,3 +188,4 @@ Copyright (C) 2011, ChaN, all right reserved.
 .. _sphinx_rtd_theme: https://github.com/readthedocs/sphinx_rtd_theme
 .. _cryptoauthlib: https://github.com/MicrochipTech/cryptoauthlib
 .. _qrcode: https://github.com/nayuki/QR-Code-generator
+.. _freemodbus: https://github.com/armink/FreeModbus_Slave-Master-RTT-STM32