First commit

firmware/Modbus-Arduino/issues/modbus-arduino-Issue5/platformio.ini

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+; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; https://docs.platformio.org/page/projectconf.html
+
+[platformio]
+default_envs = mkrvidor4000
+
+[env:teensy41]
+platform = teensy
+board = teensy41
+framework = arduino
+lib_extra_dirs = ../../..
+;lib_deps = epsilonrt/Modbus-Serial@^2.0.3
+
+[env:mkrvidor4000]
+platform = atmelsam
+board = mkrvidor4000
+framework = arduino
+lib_extra_dirs = ../../..
+;lib_deps = epsilonrt/Modbus-Serial@^2.0.3
+
+[env:mkrvidor4000-debug]
+platform = atmelsam
+framework = arduino
+board = mkrvidor4000
+debug_tool = atmel-ice
+
+
+; Debugger (gdb) support 
+; https://docs.arduino.cc/tutorials/mkr-wifi-1010/mkr-jlink-setup
+; https://gojimmypi.blogspot.com/2018/12/swd-debugging-arduino-mkr-wifi-1010.html
+
+build_type = debug
+lib_extra_dirs = ../../..
+;lib_deps = epsilonrt/Modbus-Serial@^2.0.3
+
+; activate Dual USB just as README says
+build_flags =
+    -DDEBUG                   # Comment out to disable debugging.
+;debug_build_flags = -O0 -g2 -ggdb2
+debug_build_flags = -O0 -ggdb3 -g3
+
+[env:esp32]
+framework = arduino
+platform = espressif32
+; change for your board : https://registry.platformio.org/platforms/platformio/espressif32/boards
+board = esp32doit-devkit-v1
+;board_build.f_cpu = 240000000L
+lib_extra_dirs = ../../..
+;lib_deps = epsilonrt/Modbus-Serial@^2.0.3
+;upload_port = COM9
+
+[env:esp32-debug]
+; https://dzone.com/articles/eclipse-jtag-debugging-the-esp32-with-a-segger-j-l
+; https://docs.platformio.org/en/latest/tutorials/espressif32/arduino_debugging_unit_testing.html
+; https://community.platformio.org/t/esp32-and-segger-jlink-tip-for-interface-setup-configuration/25964
+framework = arduino
+platform = espressif32
+; change for your board : https://registry.platformio.org/platforms/platformio/espressif32/boards
+board = esp32doit-devkit-v1
+;board_build.f_cpu = 240000000L
+lib_extra_dirs = ../../..
+;lib_deps = epsilonrt/Modbus-Serial@^2.0.3
+upload_port = COM1
+debug_tool = jlink

firmware/Modbus-Arduino/issues/modbus-arduino-Issue5/src/main.cpp

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+#include <ModbusSerial.h>
+
+// Used Pins
+const byte LedPin = LED_BUILTIN;
+const byte TxenPin = -1;    // -1 disables the feature, change that if you are using an RS485 driver, this pin would be connected to the DE and /RE pins of the driver.
+
+#define MySerial Serial1  // define serial port used, Serial most of the time, or Serial1, Serial2 ... if available
+const unsigned long Baudrate = 38400;
+
+const byte SlaveId = 10;
+
+const byte FirstReg = 0;
+const byte Lamp1Coil = FirstReg;
+const byte NofRegs = 32;
+
+ModbusSerial mb(MySerial, SlaveId, TxenPin);
+
+void setup() {
+
+  // MySerial.begin(Baudrate);  // works on all boards but the configuration is 8N1 which is incompatible with the MODBUS standard
+  // prefer the line below instead if possible
+  MySerial.begin (Baudrate, MB_PARITY_EVEN);
+
+  mb.config(Baudrate);
+
+  for (byte i = 0; i < NofRegs; i++) {
+
+    mb.addHreg(FirstReg + i, i);
+    mb.addIreg(FirstReg + i, i);
+    mb.addCoil(FirstReg + i, i % 2);
+    mb.addIsts(FirstReg + i, (i + 1) % 2);
+  }
+
+  pinMode(LedPin, OUTPUT);
+}
+
+void loop() {
+
+  mb.task();
+  digitalWrite(LedPin, !mb.Coil(Lamp1Coil));
+}