Added selectDATA command to Java client and modified MATLAB client to use it.

Java/src/XPlaneConnect.java

@@ -609,6 +609,36 @@ public class XPlaneConnect implements AutoCloseable
         sendUDP(os.toByteArray());
     }
 
+    /**
+     * Selects what data X-Plane will export over UDP.
+     *
+     * @param rows The row numbers to select.
+     * @throws IOException If the command cannot be sent.
+     */
+    public void selectDATA(int[] rows) throws IOException
+    {
+        //Preconditions
+        if(rows == null || rows.length == 0)
+        {
+            throw new IllegalArgumentException("rows must be a non-null, non-empty array.");
+        }
+
+        //Convert data to bytes
+        ByteBuffer bb = ByteBuffer.allocate(4 * rows.length);
+        bb.order(ByteOrder.LITTLE_ENDIAN);
+        for(int i = 0; i < rows.length; ++i)
+        {
+            bb.putInt(i * 4, rows[i]);
+        }
+
+        //Build and send message
+        ByteArrayOutputStream os = new ByteArrayOutputStream();
+        os.write("DSEL".getBytes(StandardCharsets.UTF_8));
+        os.write(0xFF); //Placeholder for message length
+        os.write(bb.array());
+        sendUDP(os.toByteArray());
+    }
+
     /**
      * Sets a message to be displayed on the screen in X-Plane at the default screen location.
      *

MATLAB/+XPlaneConnect/readDATA.m

@@ -46,3 +46,12 @@ end
 
 %% Get data
 result.raw = socket.readDATA();
+
+%% Format data
+rows = (length(result.raw) - 5) / 9;
+result.h = zeroes(rows);
+for i=1:rows
+    j = 6 + (i - 1) * 9;
+    result.h(i) = result.rows(j);
+    result.d = [result.d; result.rows((j+1):(j+9))];
+end

MATLAB/+XPlaneConnect/selectDATA.m

@@ -1,13 +1,9 @@
-function [ status ] = selectDATA( index, varargin )
+function selectDATA( rows, socket )
 % selectDATA Choose specific X-Plane parameters to be send over UDP
 % 
 % Inputs
-%     index: An array of the values that to be sent. Corresponds to the numbers on the XPlane Output screen
-%     IP Address (optional): IP Address of the machine that will receive the data as a character array. Default is '127.0.0.1' (local machine)
-%     port (optional): Port on the receiving machine where the data will be sent. Default is 49009 (XPlaneConnect). In general use 49009 to send to the plugin and 49005 to send to the x-plane udp
-% 
-% Outputs
-%     status: If there was an error. Status<0 means there was an error.
+%     rows: An array of the values that to be sent. Corresponds to the numbers on the XPlane Output screen
+%     socket (optional): The client to use when sending the command.
 % 
 % Use
 % 1. import XPlaneConnect.*;
@@ -15,29 +11,23 @@ function [ status ] = selectDATA( index, varargin )
 % 3. status = selectDATA( values, '127.0.0.1', 49005 ); % send to localhose port 49005
 %
 % Contributors
-%   [CT] Christopher Teubert (SGT, Inc.)
-%       christopher.a.teubert@nasa.gov
-%
-% To Do
-% 1. Verify Input
-%
-% BEGIN CODE
+%   Christopher Teubert (SGT, Inc.) <christopher.a.teubert@nasa.gov>
+%   Jason Watkins <jason.w.watkins@nasa.gov>
 
 import XPlaneConnect.*
 
-%% Handle Input
-p = inputParser;
-addRequired(p,'index');
-addOptional(p,'IP','127.0.0.1',@ischar);
-addOptional(p,'port',49009,@isnumeric);
-parse(p,index,varargin{:});
-
-%% BODY
-    dataString = ['DSEL'-0,0];
-    for i=1:length(index)
-        dataString = [dataString, p.Results.index(i), 0, 0, 0];
+%% Get client
+global clients;
+if ~exist('socket', 'var')
+    assert(istrue(length(clients) < 2), '[sendDATA] ERROR: Multiple clients open. You must specify which client to use.');
+    if isempty(clients)
+       openUDP(); 
     end
-    status = sendUDP(dataStream, p.Results.IP, p.Results.port);
-
+    socket = clients(1);
 end
 
+%% Validate input
+rows = int32(rows);
+
+%% Send command
+socket.selectDATA(rows);