Hello Erik,
I understand that you are trying to write to a characteristic using MATLAB. Writing to a characteristic is possible when the "Attributes" property of the input characteristic object has "Write" and/or "WriteWithoutResponse". In your case since both are present, using “write(characteristic, data)” to write to it should not give an error. Despite this getting the error “Operation failed because access was denied” indicates that the issue is not with MATLAB but rather might be with the system permissions. This error can occur when MATLAB does not have required permissions to perform the read/write.
The following actions could potentially resolve the error:
- Run MATLAB as an Administrator. Right-click on the MATLAB shortcut or executable and select "Run as administrator."
- Ensure that the file or folder you are trying to access or modify has the appropriate permissions for your user account. Check the permissions of the program files corresponding to arduino.You may need to adjust the permissions to allow MATLAB to perform the operation.
- Temporarily disable any antivirus or security software that might be blocking MATLAB from performing the operation.
You can refer to the following links for more information:
