Fix issues with undeleted comm interfaces

On deletion/disconnect, communication-objects of lower layers are now
properly deleted and disconnected.

source/EV3.m

@@ -127,6 +127,11 @@ classdef EV3 < handle
             ev3.init = 0;
         end
         
+        function delete(ev3)
+             if ev3.isConnected
+                 ev3.disconnect(); 
+             end
+        end
         %% Connection 
         function connect(ev3, varargin)
             %connect Connects EV3-object and its Motors and Sensors to physical brick.
@@ -152,8 +157,6 @@ classdef EV3 < handle
                          
                     ev3.brick = 0;
                     ev3.isConnected = 0;
-                    
-                    % error('EV3::connect: Aborted connection.');
                 end
             end
             
@@ -219,9 +222,9 @@ classdef EV3 < handle
             %  b.disconnect();
             %
             
-            if ~ev3.isConnected
-                error('EV3::connect: No brick connected.');
-            end
+%             if ~ev3.isConnected
+%                 error('EV3::connect: No brick connected.');
+%             end
             
             % Disconnect motors
             % -> set references to brick object to 0
@@ -238,7 +241,9 @@ classdef EV3 < handle
             ev3.sensor4.disconnect();
             
             % Delete handle to brick object
+            if isBrickValid(ev3.brick) && ev3.brick ~= 0
                 ev3.brick.delete();
+            end
             ev3.brick = 0;
             
             ev3.isConnected = 0;

source/Motor.m

@@ -256,9 +256,9 @@ classdef Motor < handle
             %  brickInterface.delete(); % Actual disconnecting!!!
             % 
             
-            if ~motor.isConnected
-                error('Motor::disconnect: No brick connected.');
-            end
+%             if ~motor.isConnected
+%                 error('Motor::disconnect: No brick connected.');
+%             end
             
             motor.brick = 0; % Note: actual deleting is done in EV3::disconnect.
             motor.isConnected = 0;

source/Sensor.m

@@ -136,9 +136,9 @@ classdef Sensor < handle
         
         function disconnect(sensor)
             %disconnect Disconnects Sensor-object from physical brick
-            if ~sensor.isConnected
-                error('Sensor::disconnect: No brick connected.');
-            end
+%             if ~sensor.isConnected
+%                 error('Sensor::disconnect: No brick connected.');
+%             end
             
             sensor.brick = 0; % Note: actual deleting is done in EV3::disconnect.
             sensor.isConnected = 0;
@@ -163,8 +163,8 @@ classdef Sensor < handle
             if strcmp(class(oldMode),class(newMode)) && oldMode~=newMode
                 if ~strcmp(class(oldMode), 'DeviceMode.Error') && ...
                         ~strcmp(class(newMode), 'DeviceMode.Error')
-                    warning(['Sensor::update: Physical sensor''s mode was not ',...
-                        'the specified one. Changing...']);
+                    %warning(['Sensor::update: Physical sensor''s mode was not ',...
+                    %    'the specified one. Changing...']);
                     
                     sensor.setMode(oldMode);
                     sensor.mode = oldMode;