Use mgmt client impl to query max apdu

Author: bmalinowsky

src/tuwien/auto/calimero/mgmt/ManagementClientImpl.java

@@ -1419,7 +1419,7 @@ protected byte[] sendWait(final Destination d, final Priority p, final byte[] ap
 		return waitForResponse(d.getAddress(), responseServiceType, minAsduLen, maxAsduLen, start, timeout);
 	}
 
-	private int maxApduLength(final Destination dst) throws KNXLinkClosedException, InterruptedException {
+	int maxApduLength(final Destination dst) throws KNXLinkClosedException, InterruptedException {
 		final Optional<Integer> max = dst.maxApduLength();
 		if (max.isPresent())
 			return max.get();

src/tuwien/auto/calimero/mgmt/ManagementProceduresImpl.java

@@ -918,8 +918,7 @@ private void sendDD0Read(final Destination dst) throws KNXLinkClosedException {
 	private int readMaxApduLength(final Destination d) throws InterruptedException
 	{
 		try {
-			final byte[] data = mc.readProperty(d, DEVICE_OBJECT_INDEX, PropertyAccess.PID.MAX_APDULENGTH, 1, 1);
-			return toUnsigned(data);
+			return ((ManagementClientImpl) mc).maxApduLength(d);
 		}
 		catch (final KNXException e) {
 			return defaultApduLength;
@@ -931,11 +930,6 @@ private static void waitFor(final int ms) throws InterruptedException
 		Thread.sleep(ms);
 	}
 
-	private static int toUnsigned(final byte[] data)
-	{
-		return ((data[0] & 0xff) << 8) | (data[1] & 0xff);
-	}
-
 	private static boolean isOddParity(final int bite)
 	{
 		int parity = bite ^ (bite >> 4);