Custom Arduino Addon Library Issues - MWArduinoClass& and sendRequestMsg

Hello,

I am having an issue creating an Arduino object with an custom add-on library. I think I have followed all the documentation both for the Arduino Hardware Troubleshooting, the custom addon library setup documentation and examples.

I can create an Arduino as here:

>> a= arduino()
Updating server code on board Due (COM9). This may take a few minutes.
 
a = 
 
  arduino with properties:
 
                  Port: 'COM9'
                 Board: 'Due'
         AvailablePins: {'D2-D53', 'A0-A11'}
  AvailableDigitalPins: {'D2-D53', 'A0-A11'}
      AvailablePWMPins: {'D2-D13'}
   AvailableAnalogPins: {'A0-A11'}
    AvailableI2CBusIDs: [0, 1]
             Libraries: {'I2C', 'SPI', 'Servo'}

And I know that my custom addon can be read by the MATLAB terminal:

>> listArduinoLibraries
 
ans =
 
  8×1 cell array
 
    {'Adafruit/MotorShieldV2'       }
    {'I2C'                          }
    {'RotaryEncoder'                }
    {'SPI'                          }
    {'Servo'                        }
    {'ShiftRegister'                }
    {'Ultrasonic'                   }
    {'MyFolder/MyClass'}...

The project folder setup is similar to the one described in the HelloWorld class addon example.

When I run this command:

arduinoObj = arduino('COM9', 'Due', 'Libraries', 'MyFolder/MyClass', 'ForceBuildOn', true, 'Trace',true);

This is the output:

Updating server code on board Due (COM9). This may take a few minutes.
Loading configuration...
Initialising packages...
Preparing boards...
Verifying...
...
(A LOT OF SEEMINGLY NORMAL LOGS)
...
\Users\Me\AppData\Local\Temp\ArduinoServer\MW\sketch\PeripheralToHandle.c: In function 'getHandle':
 
C:\Users\Me\AppData\Local\Temp\ArduinoServer\MW\sketch\PeripheralToHandle.c:86:10: warning: cast to pointer from integer of different size
[-Wint-to-pointer-cast]
 
   return (MW_Handle_Type)handleValue;
 
          ^
 
"C:\ProgramData\MATLAB\SupportPackages\R2019a\3P.instrset\arduinoide.instrset\idepkgs\packages\arduino\tools\arm-none-eabi-gcc\4.8.3-2014q1/bin/arm-none-eabi-gcc"
-c -g -Os  -std=gnu11 -ffunction-sections -fdata-sections -nostdlib --param max-inline-insns-single=500 -Dprintf=iprintf -MMD -mcpu=cortex-m3
...
(A BIT MORE SEEMINGLY NORMAL LOGS)
...
"C:\Users\Me\AppData\Local\Temp\ArduinoServer\MW\sketch\IO_addOn.cpp.o"
In file included from C:\Users\Me\AppData\Local\Temp\ArduinoServer\MW\sketch\IO_addOn.cpp:12:0:
 
addOnLibraries.h:6: error: 'MyClass' does not name a type
 
 MyClass aMyClass(hwObject); // ID = 0
 
 ^
 
Using library Wire at version 1.0 in folder:
...(A bit more stuff)
...

I think the errors are related to these parts of the C++ class that are highlighted with errors in my IDE. The issue is that I took these lines directly from the HelloWorld example, so it is odd that it appears with errors in the IDE.

Some relevant lines from my Header file are:

#include "LibraryBase.h"  // MATLAB Connection
#include <Arduino.h>
 
class MyClass : public LibraryBase {
 
public:
     MyClass(MWArduinoClass& a) { // TODO Error highlight at MWArduinoClass
      libName = "MyFolder/MyClass";  // Folder/class
      a.registerLibrary(this);
      }
 
      void commandHandler(byte cmdID, byte* dataIn, unsigned int payloadSize) {
      switch (cmdID) {
      case TEST_CONNECTION: {
      testConnection();
      byte value[17] = "Good connection.";
      sendResponseMsg(cmdID, value, 17);  // TODO Error highlight at sendResponseMsg
      break;
 }
... more stuff

The error highlight at the `MWArduinoClass&` line from cpplint says:

(int)4096
 Is this a non-const reference? If so, make const or use a pointer: MWArduinoClass& a  [runtime/references]cpplint
 Single-parameter constructors should be marked explicit.  [runtime/explicit]cpplint
expected ')' before '&' token
identifier "MWArduinoClass" is undefined

Where would MWArduinoClass be included if not from LibraryBase.h?

The error highlight at the `sendResponseMsg` line from cpplint says:

(int)4096
'sendResponseMsg' was not declared in this scope
identifier "sendResponseMsg" is undefined

How do I include this function so it does not appear undefined?

I think that because the C++ library cannot build properly due to these two undefined external terms, this may cause the error uploading the library into the Arduino. However, I have looked into the CommandHandler documentation and the LCD custom addon library example where `sendResponseMsg` is explained and I still cannot find how to make these terms defined within the library file. Could you give me some guidance, please?

Note that if you copy paste this error description I have written into a markdown visualizer, it would look much nicer to read. The C++ library editor is Visual Studio Code and the library is built using PlatformIO.

Thanks

[Dennis Hölter]

I have the same/a simular problem... did you solved it?