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Calimero, a free KNX network library
/*
Calimero 2 - A library for KNX network access
Copyright (c) 2015, 2018 B. Malinowsky
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Linking this library statically or dynamically with other modules is
making a combined work based on this library. Thus, the terms and
conditions of the GNU General Public License cover the whole
combination.
As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
modules, and to copy and distribute the resulting executable under terms
of your choice, provided that you also meet, for each linked independent
module, the terms and conditions of the license of that module. An
independent module is a module which is not derived from or based on
this library. If you modify this library, you may extend this exception
to your version of the library, but you are not obligated to do so. If
you do not wish to do so, delete this exception statement from your
version.
*/
package tuwien.auto.calimero.mgmt;
import static tuwien.auto.calimero.knxnetip.KNXnetIPConnection.BlockingMode.WaitForCon;
import java.util.ArrayDeque;
import java.util.ArrayList;
import java.util.Deque;
import java.util.List;
import java.util.function.Consumer;
import tuwien.auto.calimero.CloseEvent;
import tuwien.auto.calimero.FrameEvent;
import tuwien.auto.calimero.KNXException;
import tuwien.auto.calimero.KNXInvalidResponseException;
import tuwien.auto.calimero.KNXListener;
import tuwien.auto.calimero.KNXRemoteException;
import tuwien.auto.calimero.cemi.CEMI;
import tuwien.auto.calimero.cemi.CEMIDevMgmt;
abstract class LocalDeviceManagement implements PropertyAdapter
{
protected final class KNXListenerImpl implements KNXListener
{
@Override
public void frameReceived(final FrameEvent e)
{
if (e.getFrame() instanceof CEMIDevMgmt) {
synchronized (frames) {
frames.add(e.getFrame());
}
}
}
@Override
public void connectionClosed(final CloseEvent e)
{
closed = true;
final int initiator = serverReset ? CloseEvent.SERVER_REQUEST : e.getInitiator();
adapterClosed.accept(new CloseEvent(LocalDeviceManagement.this, initiator,
serverReset ? "server reset" : e.getReason()));
}
}
private static final int DEVICE_OBJECT = 0;
protected final AutoCloseable c;
private final Consumer adapterClosed;
private final Deque frames = new ArrayDeque<>();
private volatile boolean serverReset;
private final List interfaceObjects = new ArrayList<>();
private final boolean checkRW;
private volatile boolean closed;
private int lastObjIndex;
private int lastPropIndex;
private int lastPid;
LocalDeviceManagement(final AutoCloseable connection, final Consumer adapterClosed,
final boolean queryWriteEnable)
{
c = connection;
this.adapterClosed = adapterClosed;
checkRW = queryWriteEnable;
}
void init() throws KNXException, InterruptedException
{
resetLastDescription();
try {
initInterfaceObjects();
}
catch (final KNXException e) {
try {
c.close();
}
catch (final Exception ignore) {}
throw e;
}
}
@Override
public void setProperty(final int objIndex, final int pid, final int start, final int elements,
final byte... data) throws KNXException, InterruptedException
{
if (closed)
throw new IllegalStateException("adapter closed");
final int objectType = getObjectType(objIndex);
final int objectInstance = getObjectInstance(objIndex, objectType);
send(new CEMIDevMgmt(CEMIDevMgmt.MC_PROPWRITE_REQ, objectType, objectInstance, pid, start,
elements, data), WaitForCon);
findFrame(CEMIDevMgmt.MC_PROPWRITE_CON);
}
@Override
public byte[] getProperty(final int objIndex, final int pid, final int start, final int elements)
throws KNXException, InterruptedException
{
if (closed)
throw new IllegalStateException("adapter closed");
final int objectType = getObjectType(objIndex);
final int objectInstance = getObjectInstance(objIndex, objectType);
send(new CEMIDevMgmt(CEMIDevMgmt.MC_PROPREAD_REQ, objectType, objectInstance, pid, start,
elements), WaitForCon);
return findFrame(CEMIDevMgmt.MC_PROPREAD_CON);
}
@Override
public byte[] getDescription(final int objIndex, final int pid, final int propIndex)
throws KNXException, InterruptedException
{
// imitate property description:
// oindex: PropertyAccess.PID.IO_LIST
// pid: supplied, conditional
// pindex: supplied, conditional
// read-only: only with write emulation
// pdt: -
// elements (2 bytes): current number of elements
// rLevel: - (not existent)
// wLevel: - (not existent)
if (pid != 0 || objIndex != lastObjIndex || propIndex < lastPropIndex)
resetLastDescription();
// get current number of elements
// since we can't query by index, emulate with PID if necessary
byte[] ret = null;
int p = pid;
if (p == 0) {
p = lastPid;
int i = lastPropIndex;
while (p < 0xff && i < propIndex)
try {
ret = getProperty(objIndex, ++p, 0, 1);
++i;
}
catch (final KNXRemoteException ignore) {}
if (i != propIndex) {
resetLastDescription();
throw new KNXRemoteException("can't deduce property index in object");
}
setLastDescription(objIndex, i, p);
}
else
ret = getProperty(objIndex, p, 0, 1);
int writeEnabled = 0;
if (checkRW) {
// check out if write enabled or read only
try {
setProperty(objIndex, p, 0, 1, ret);
writeEnabled = 0x80;
}
catch (final KNXRemoteException e) {}
}
// ??? should we return current number of elements for max.element
// int elements = 0;
// for (int i = 0; i < ret.length; ++i)
// elements = elements << 8 | ret[i] & 0xff;
return new byte[] { (byte) objIndex, (byte) p, (byte) propIndex, (byte) writeEnabled, 0, 0, 0 };
}
@Override
public boolean isOpen()
{
return !closed;
}
@Override
public void close()
{
if (!closed) {
closed = true;
try {
c.close();
}
catch (final Exception ignore) {}
}
}
protected abstract void send(CEMIDevMgmt frame, Object mode) throws KNXException, InterruptedException;
protected byte[] findFrame(final int messageCode) throws KNXRemoteException, InterruptedException {
while (true) {
final CEMIDevMgmt frame;
synchronized (frames) {
if (frames.isEmpty())
throw new KNXInvalidResponseException(
String.format("confirmation expected (msg code 0x%x)", messageCode));
frame = (CEMIDevMgmt) frames.remove();
}
final int mc = frame.getMessageCode();
if (mc == CEMIDevMgmt.MC_RESET_IND) {
serverReset = true;
close();
throw new KNXRemoteException("received reset indication from server, connection closed");
}
else if (mc == messageCode) {
if (frame.isNegativeResponse())
throw new KNXRemoteException("L-DM negative response, " + frame.getErrorMessage());
return frame.getPayload();
}
}
}
protected int getObjectType(final int objIndex) throws KNXRemoteException
{
if (objIndex < interfaceObjects.size())
return interfaceObjects.get(objIndex);
throw new KNXRemoteException("interface object with index " + objIndex + " not listed");
}
private int getObjectInstance(final int objIndex, final int objectType)
{
int instance = 0;
for (int i = 0; i <= objIndex; i++) {
if (interfaceObjects.get(i) == objectType)
instance++;
}
return instance;
}
protected void initInterfaceObjects() throws KNXException, InterruptedException
{
send(new CEMIDevMgmt(CEMIDevMgmt.MC_PROPREAD_REQ, DEVICE_OBJECT, 1,
PropertyAccess.PID.IO_LIST, 0, 1), WaitForCon);
int objects = 0;
try {
final byte[] ret = findFrame(CEMIDevMgmt.MC_PROPREAD_CON);
objects = (ret[0] & 0xff) << 8 | (ret[1] & 0xff);
}
catch (final KNXRemoteException e) {
// device only has device- and cEMI server-object
interfaceObjects.add(DEVICE_OBJECT);
interfaceObjects.add(8);
return;
}
send(new CEMIDevMgmt(CEMIDevMgmt.MC_PROPREAD_REQ, DEVICE_OBJECT, 1,
PropertyAccess.PID.IO_LIST, 1, objects), WaitForCon);
final byte[] ret = findFrame(CEMIDevMgmt.MC_PROPREAD_CON);
for (int i = 0; i < objects; ++i) {
final int objType = (ret[2 * i] & 0xff) << 8 | (ret[2 * i + 1] & 0xff);
interfaceObjects.add(objType);
}
}
private void resetLastDescription()
{
lastObjIndex = -1;
lastPropIndex = -1;
lastPid = 0;
}
private void setLastDescription(final int oi, final int pi, final int pid)
{
lastObjIndex = oi;
lastPropIndex = pi;
lastPid = pid;
}
}