esp-modbus: move idf component files

test/mb_example_common/CMakeLists.txt

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+# The following five lines of boilerplate have to be in your project's
+# CMakeLists in this exact order for cmake to work correctly
+cmake_minimum_required(VERSION 3.5)
+idf_component_register(SRCS "modbus_params.c"
+                    INCLUDE_DIRS "include"
+                    PRIV_REQUIRES freemodbus)

test/mb_example_common/README.md

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+# Modbus Example Common
+
+This directory contains component that is common for Modbus master and slave examples. The component defines Modbus parameters that are shared between examples and provide code that you can copy and adapt into your own projects.
+For more information please refer to Modbus example README.md files located in the folders:
+
+* `examples/protocols/modbus/serial/mb_master` Modbus serial master implementation (RTU and ASCII)
+* `examples/protocols/modbus/serial/mb_slave` Modbus serial slave implementation (RTU and ASCII)
+* `examples/protocols/modbus/serial/mb_master` Modbus serial master implementation (RTU and ASCII)
+* `examples/protocols/modbus/tcp/mb_tcp_slave` Modbus serial slave implementation (TCP)
+* `examples/protocols/modbus/tcp/mb_tcp_master` Modbus serial master implementation (TCP)

test/mb_example_common/include/modbus_params.h

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+/*
+ * SPDX-FileCopyrightText: 2016-2021 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/*=====================================================================================
+ * Description:
+ *   The Modbus parameter structures used to define Modbus instances that
+ *   can be addressed by Modbus protocol. Define these structures per your needs in
+ *   your application. Below is just an example of possible parameters.
+ *====================================================================================*/
+#ifndef _DEVICE_PARAMS
+#define _DEVICE_PARAMS
+
+// This file defines structure of modbus parameters which reflect correspond modbus address space
+// for each modbus register type (coils, discreet inputs, holding registers, input registers)
+#pragma pack(push, 1)
+typedef struct
+{
+    uint8_t discrete_input0:1;
+    uint8_t discrete_input1:1;
+    uint8_t discrete_input2:1;
+    uint8_t discrete_input3:1;
+    uint8_t discrete_input4:1;
+    uint8_t discrete_input5:1;
+    uint8_t discrete_input6:1;
+    uint8_t discrete_input7:1;
+    uint8_t discrete_input_port1:8;
+} discrete_reg_params_t;
+#pragma pack(pop)
+
+#pragma pack(push, 1)
+typedef struct
+{
+    uint8_t coils_port0;
+    uint8_t coils_port1;
+} coil_reg_params_t;
+#pragma pack(pop)
+
+#pragma pack(push, 1)
+typedef struct
+{
+    float input_data0; // 0
+    float input_data1; // 2
+    float input_data2; // 4
+    float input_data3; // 6
+    uint16_t data[150]; // 8 + 150 = 158
+    float input_data4; // 158
+    float input_data5;
+    float input_data6;
+    float input_data7;
+    uint16_t data_block1[150];
+} input_reg_params_t;
+#pragma pack(pop)
+
+#pragma pack(push, 1)
+typedef struct
+{
+    float holding_data0;
+    float holding_data1;
+    float holding_data2;
+    float holding_data3;
+    uint16_t test_regs[150];
+    float holding_data4;
+    float holding_data5;
+    float holding_data6;
+    float holding_data7;
+} holding_reg_params_t;
+#pragma pack(pop)
+
+extern holding_reg_params_t holding_reg_params;
+extern input_reg_params_t input_reg_params;
+extern coil_reg_params_t coil_reg_params;
+extern discrete_reg_params_t discrete_reg_params;
+
+#endif // !defined(_DEVICE_PARAMS)

test/mb_example_common/modbus_params.c

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+/*
+ * SPDX-FileCopyrightText: 2016-2021 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+/*=====================================================================================
+ * Description:
+ *   C file to define parameter storage instances
+ *====================================================================================*/
+#include <stdint.h>
+#include "modbus_params.h"
+
+// Here are the user defined instances for device parameters packed by 1 byte
+// These are keep the values that can be accessed from Modbus master
+holding_reg_params_t holding_reg_params = { 0 };
+
+input_reg_params_t input_reg_params = { 0 };
+
+coil_reg_params_t coil_reg_params = { 0 };
+
+discrete_reg_params_t discrete_reg_params = { 0 };