basic stream managment functionality

src/eu/siacs/conversations/crypto/OtrEngine.java

@@ -20,7 +20,7 @@ import android.util.Log;
 import eu.siacs.conversations.entities.Account;
 import eu.siacs.conversations.persistance.DatabaseBackend;
 import eu.siacs.conversations.xml.Element;
-import eu.siacs.conversations.xmpp.MessagePacket;
+import eu.siacs.conversations.xmpp.stanzas.MessagePacket;
 
 import net.java.otr4j.OtrEngineHost;
 import net.java.otr4j.OtrException;

src/eu/siacs/conversations/entities/MucOptions.java

@@ -5,7 +5,7 @@ import java.util.List;
 
 import eu.siacs.conversations.entities.MucOptions.User;
 import eu.siacs.conversations.xml.Element;
-import eu.siacs.conversations.xmpp.PresencePacket;
+import eu.siacs.conversations.xmpp.stanzas.PresencePacket;
 import android.annotation.SuppressLint;
 import android.util.Log;
 

src/eu/siacs/conversations/services/XmppConnectionService.java

@@ -35,15 +35,15 @@ import eu.siacs.conversations.utils.OnPhoneContactsLoadedListener;
 import eu.siacs.conversations.utils.PhoneHelper;
 import eu.siacs.conversations.utils.UIHelper;
 import eu.siacs.conversations.xml.Element;
-import eu.siacs.conversations.xmpp.IqPacket;
-import eu.siacs.conversations.xmpp.MessagePacket;
 import eu.siacs.conversations.xmpp.OnIqPacketReceived;
 import eu.siacs.conversations.xmpp.OnMessagePacketReceived;
 import eu.siacs.conversations.xmpp.OnPresencePacketReceived;
 import eu.siacs.conversations.xmpp.OnStatusChanged;
 import eu.siacs.conversations.xmpp.OnTLSExceptionReceived;
-import eu.siacs.conversations.xmpp.PresencePacket;
 import eu.siacs.conversations.xmpp.XmppConnection;
+import eu.siacs.conversations.xmpp.stanzas.IqPacket;
+import eu.siacs.conversations.xmpp.stanzas.MessagePacket;
+import eu.siacs.conversations.xmpp.stanzas.PresencePacket;
 import android.app.AlarmManager;
 import android.app.PendingIntent;
 import android.app.Service;
@@ -126,7 +126,9 @@ public class XmppConnectionService extends Service {
 						|| (packet.hasChild("sent"))) {
 					message = MessageParser.parseCarbonMessage(packet, account,
 							service);
+					if (message!=null) {
 						message.getConversation().markRead();
+					}
 					notify = false;
 				}
 
@@ -195,13 +197,6 @@ public class XmppConnectionService extends Service {
 				if (convChangedListener != null) {
 					convChangedListener.onConversationListChanged();
 				}
-				if (account.getKeys().has("pgp_signature")) {
-					try {
-						sendPgpPresence(account, account.getKeys().getString("pgp_signature"));
-					} catch (JSONException e) {
-						//
-					}
-				}
 				scheduleWakeupCall(PING_INTERVAL, true);
 			} else if (account.getStatus() == Account.STATUS_OFFLINE) {
 				Log.d(LOGTAG,"onStatusChanged offline");
@@ -445,7 +440,7 @@ public class XmppConnectionService extends Service {
 		super.onDestroy();
 		for (Account account : accounts) {
 			if (account.getXmppConnection() != null) {
-				disconnect(account);
+				disconnect(account,true);
 			}
 		}
 	}
@@ -864,7 +859,7 @@ public class XmppConnectionService extends Service {
 	public void deleteAccount(Account account) {
 		Log.d(LOGTAG, "called delete account");
 		if (account.getXmppConnection() != null) {
-			this.disconnect(account);
+			this.disconnect(account,false);
 		}
 		databaseBackend.deleteAccount(account);
 		this.accounts.remove(account);
@@ -954,7 +949,7 @@ public class XmppConnectionService extends Service {
 			packet.setAttribute("to", conversation.getContactJid().split("/")[0]+"/"+nick);
 			packet.setAttribute("from", conversation.getAccount().getFullJid());
 			
-			packet = conversation.getAccount().getXmppConnection().sendPresencePacket(packet, new OnPresencePacketReceived() {
+			conversation.getAccount().getXmppConnection().sendPresencePacket(packet, new OnPresencePacketReceived() {
 				
 				@Override
 				public void onPresencePacketReceived(Account account, PresencePacket packet) {
@@ -992,7 +987,7 @@ public class XmppConnectionService extends Service {
 		conversation.getMucOptions().setOffline();
 	}
 
-	public void disconnect(Account account) {
+	public void disconnect(final Account account, boolean blocking) {
 		List<Conversation> conversations = getConversations();
 		for (int i = 0; i < conversations.size(); i++) {
 			Conversation conversation = conversations.get(i);
@@ -1009,10 +1004,22 @@ public class XmppConnectionService extends Service {
 				}
 			}
 		}
-		account.getXmppConnection().disconnect();
+		if (!blocking) {
+			new Thread(new Runnable() {
+				
+				@Override
+				public void run() {
+					account.getXmppConnection().disconnect(false);
 					Log.d(LOGTAG, "disconnected account: " + account.getJid());
 					account.setXmppConnection(null);
 				}
+			}).start();
+		} else {
+			account.getXmppConnection().disconnect(false);
+			Log.d(LOGTAG, "disconnected account: " + account.getJid());
+			account.setXmppConnection(null);
+		}
+	}
 
 	@Override
 	public IBinder onBind(Intent intent) {
@@ -1134,20 +1141,27 @@ public class XmppConnectionService extends Service {
 		this.tlsException = null;
 	}
 
-	public void reconnectAccount(Account account) {
+	public void reconnectAccount(final Account account) {
+		new Thread(new Runnable() {
+			
+			@Override
+			public void run() {
 				if (account.getXmppConnection() != null) {
-			disconnect(account);
+					disconnect(account,true);
 				}
 				if (!account.isOptionSet(Account.OPTION_DISABLED)) {
 					if (account.getXmppConnection()==null) {
-				account.setXmppConnection(this.createConnection(account));
+						account.setXmppConnection(createConnection(account));
 					}
 					Thread thread = new Thread(account.getXmppConnection());
 					thread.start();
 				}	
 			}
+		}).start();
+	}
 	
 	public void ping(final Account account,final int timeout) {
+		account.getXmppConnection().r();
 		Log.d(LOGTAG,account.getJid()+": sending ping");
 		IqPacket iq = new IqPacket(IqPacket.TYPE_GET);
 		Element ping = new Element("ping");

src/eu/siacs/conversations/ui/ConversationFragment.java

@@ -332,6 +332,9 @@ public class ConversationFragment extends Fragment {
 		final ConversationActivity activity = (ConversationActivity) getActivity();
 		activity.registerListener();
 		this.conversation = activity.getSelectedConversation();
+		if (this.conversation==null) {
+			return;
+		}
 		this.selfBitmap = findSelfPicture();
 		updateMessages();
 		// rendering complete. now go tell activity to close pane
@@ -374,7 +377,6 @@ public class ConversationFragment extends Fragment {
 	public void updateMessages() {
 		ConversationActivity activity = (ConversationActivity) getActivity();
 		List<Message> encryptedMessages = new LinkedList<Message>();
-		// TODO this.conversation could be null?!
 		for(Message message : this.conversation.getMessages()) {
 			if (message.getEncryption() == Message.ENCRYPTION_PGP) {
 				encryptedMessages.add(message);

src/eu/siacs/conversations/utils/MessageParser.java

@@ -11,7 +11,7 @@ import eu.siacs.conversations.entities.Conversation;
 import eu.siacs.conversations.entities.Message;
 import eu.siacs.conversations.services.XmppConnectionService;
 import eu.siacs.conversations.xml.Element;
-import eu.siacs.conversations.xmpp.MessagePacket;
+import eu.siacs.conversations.xmpp.stanzas.MessagePacket;
 
 public class MessageParser {
 	

src/eu/siacs/conversations/xml/TagWriter.java

@@ -5,25 +5,29 @@ import java.io.OutputStream;
 import java.io.OutputStreamWriter;
 import java.util.concurrent.LinkedBlockingQueue;
 
-import android.util.Log;
+import eu.siacs.conversations.xmpp.stanzas.AbstractStanza;
 
 public class TagWriter {
 	
 	private OutputStreamWriter outputStream;
-	private LinkedBlockingQueue<String> writeQueue = new LinkedBlockingQueue<String>();
+	private boolean finshed = false;
-	private Thread writer = new Thread() {
+	private LinkedBlockingQueue<AbstractStanza> writeQueue = new LinkedBlockingQueue<AbstractStanza>();
-		public boolean shouldStop = false;
+	private Thread asyncStanzaWriter = new Thread() {
+		private boolean shouldStop = false;
 		@Override
 		public void run() {
 			while(!shouldStop) {
+				if ((finshed)&&(writeQueue.size() == 0)) {
+					return;
+				}
 				try {
-					String output = writeQueue.take();
+					AbstractStanza output = writeQueue.take();
-					outputStream.write(output);
+					outputStream.write(output.toString());
 					outputStream.flush();
 				} catch (IOException e) {
-					Log.d("xmppService", "error writing to stream");
+					shouldStop = true;
 				} catch (InterruptedException e) {
-					
+					shouldStop = true;
 				}
 			}
 		}
@@ -31,34 +35,49 @@ public class TagWriter {
 	
 	
 	public TagWriter() {
-		
 	}
 	
 	public TagWriter(OutputStream out) {
 		this.setOutputStream(out);
-		writer.start();
 	}
 	
 	public void setOutputStream(OutputStream out) {
 		this.outputStream = new OutputStreamWriter(out);
-		if (!writer.isAlive()) writer.start();
 	}
 	
-	public TagWriter beginDocument() {
+	public TagWriter beginDocument() throws IOException {
-		writeQueue.add("<?xml version='1.0'?>");
+		outputStream.write("<?xml version='1.0'?>");
+		outputStream.flush();
 		return this;
 	}
 	
-	public TagWriter writeTag(Tag tag) {
+	public TagWriter writeTag(Tag tag) throws IOException {
-		writeQueue.add(tag.toString());
+		outputStream.write(tag.toString());
+		outputStream.flush();
 		return this;
 	}
 
-	public void writeString(String string) {
+	public TagWriter writeElement(Element element) throws IOException {
-		writeQueue.add(string);
+		outputStream.write(element.toString());
+		outputStream.flush();
+		return this;
 	}
 	
-	public void writeElement(Element element) {
+	public TagWriter writeStanzaAsync(AbstractStanza stanza) {
-		writeQueue.add(element.toString());
+		if (finshed) {
+			return this;
+		} else {
+			if (!asyncStanzaWriter.isAlive()) asyncStanzaWriter.start();
+			writeQueue.add(stanza);
+			return this;
+		}
+	}
+	
+	public void finish() {
+		this.finshed = true;
+	}
+	
+	public boolean finished() {
+		return (this.writeQueue.size() == 0);
 	}
 }

src/eu/siacs/conversations/xmpp/OnIqPacketReceived.java

@@ -1,6 +1,7 @@
 package eu.siacs.conversations.xmpp;
 
 import eu.siacs.conversations.entities.Account;
+import eu.siacs.conversations.xmpp.stanzas.IqPacket;
 
 public interface OnIqPacketReceived extends PacketReceived {
 	public void onIqPacketReceived(Account account, IqPacket packet);

src/eu/siacs/conversations/xmpp/OnMessagePacketReceived.java

@@ -1,6 +1,7 @@
 package eu.siacs.conversations.xmpp;
 
 import eu.siacs.conversations.entities.Account;
+import eu.siacs.conversations.xmpp.stanzas.MessagePacket;
 
 public interface OnMessagePacketReceived extends PacketReceived {
 	public void onMessagePacketReceived(Account account, MessagePacket packet);

src/eu/siacs/conversations/xmpp/OnPresencePacketReceived.java

@@ -1,6 +1,7 @@
 package eu.siacs.conversations.xmpp;
 
 import eu.siacs.conversations.entities.Account;
+import eu.siacs.conversations.xmpp.stanzas.PresencePacket;
 
 public interface OnPresencePacketReceived extends PacketReceived {
 	public void onPresencePacketReceived(Account account, PresencePacket packet);

src/eu/siacs/conversations/xmpp/PresencePacket.java

@@ -1,13 +0,0 @@
-package eu.siacs.conversations.xmpp;
-
-import eu.siacs.conversations.xml.Element;
-
-public class PresencePacket extends Element {
-	private PresencePacket(String name) {
-		super("presence");
-	}
-	
-	public PresencePacket() {
-		super("presence");
-	}
-}

src/eu/siacs/conversations/xmpp/XmppConnection.java

@@ -26,8 +26,10 @@ import javax.net.ssl.TrustManager;
 import javax.net.ssl.TrustManagerFactory;
 import javax.net.ssl.X509TrustManager;
 
+import org.json.JSONException;
 import org.xmlpull.v1.XmlPullParserException;
 
+import android.content.IntentSender.SendIntentException;
 import android.os.Bundle;
 import android.os.PowerManager;
 import android.util.Log;
@@ -38,6 +40,14 @@ import eu.siacs.conversations.xml.Element;
 import eu.siacs.conversations.xml.Tag;
 import eu.siacs.conversations.xml.TagWriter;
 import eu.siacs.conversations.xml.XmlReader;
+import eu.siacs.conversations.xmpp.stanzas.AbstractStanza;
+import eu.siacs.conversations.xmpp.stanzas.IqPacket;
+import eu.siacs.conversations.xmpp.stanzas.MessagePacket;
+import eu.siacs.conversations.xmpp.stanzas.PresencePacket;
+import eu.siacs.conversations.xmpp.stanzas.streammgmt.AckPacket;
+import eu.siacs.conversations.xmpp.stanzas.streammgmt.EnablePacket;
+import eu.siacs.conversations.xmpp.stanzas.streammgmt.RequestPacket;
+import eu.siacs.conversations.xmpp.stanzas.streammgmt.ResumePacket;
 
 public class XmppConnection implements Runnable {
 
@@ -57,6 +67,11 @@ public class XmppConnection implements Runnable {
 	private Element streamFeatures;
 	private HashSet<String> discoFeatures = new HashSet<String>();
 	
+	private String streamId = null;
+	
+	private int stanzasReceived = 0;
+	private int stanzasSent = 0;
+
 	private static final int PACKET_IQ = 0;
 	private static final int PACKET_MESSAGE = 1;
 	private static final int PACKET_PRESENCE = 2;
@@ -176,6 +191,34 @@ public class XmppConnection implements Runnable {
 			} else if (nextTag.isStart("failure")) {
 				Element failure = tagReader.readElement(nextTag);
 				changeStatus(Account.STATUS_UNAUTHORIZED);
+			} else if (nextTag.isStart("enabled")) {
+				this.stanzasSent = 0;
+				Element enabled = tagReader.readElement(nextTag);
+				if ("true".equals(enabled.getAttribute("resume"))) {
+					this.streamId = enabled.getAttribute("id");
+					Log.d(LOGTAG,account.getJid()+": stream managment enabled (resumable)");
+				} else {
+					Log.d(LOGTAG,account.getJid()+": stream managment enabled");
+				}
+				this.stanzasReceived = 0;
+				RequestPacket r = new RequestPacket();
+				tagWriter.writeStanzaAsync(r);
+			} else if (nextTag.isStart("resumed")) {
+				tagReader.readElement(nextTag);
+				changeStatus(Account.STATUS_ONLINE);
+				Log.d(LOGTAG,account.getJid()+": session resumed");
+			} else if (nextTag.isStart("r")) {
+				tagReader.readElement(nextTag);
+				AckPacket ack = new AckPacket(this.stanzasReceived);
+				//Log.d(LOGTAG,ack.toString());
+				tagWriter.writeStanzaAsync(ack);
+			} else if (nextTag.isStart("a")) {
+				Element ack = tagReader.readElement(nextTag);
+				int serverSequence = Integer.parseInt(ack.getAttribute("h"));
+				if (serverSequence>this.stanzasSent) {
+					this.stanzasSent = serverSequence;
+				}
+				//Log.d(LOGTAG,"server ack"+ack.toString()+" ("+this.stanzasSent+")");
 			} else if (nextTag.isStart("iq")) {
 				processIq(nextTag);
 			} else if (nextTag.isStart("message")) {
@@ -221,6 +264,7 @@ public class XmppConnection implements Runnable {
 			}
 			nextTag = tagReader.readTag();
 		}
+		++stanzasReceived;
 		return element;
 	}
 
@@ -271,7 +315,7 @@ public class XmppConnection implements Runnable {
 		}
 	}
 
-	private void sendStartTLS() {
+	private void sendStartTLS() throws IOException {
 		Tag startTLS = Tag.empty("starttls");
 		startTLS.setAttribute("xmlns", "urn:ietf:params:xml:ns:xmpp-tls");
 		tagWriter.writeTag(startTLS);
@@ -378,24 +422,44 @@ public class XmppConnection implements Runnable {
 		} else if (this.streamFeatures.hasChild("mechanisms")
 				&& shouldAuthenticate) {
 			sendSaslAuth();
-		}
+		} else if (this.streamFeatures.hasChild("sm") && streamId != null) {
-		if (this.streamFeatures.hasChild("bind") && shouldBind) {
+			Log.d(LOGTAG,"found old stream id. trying to remuse");
+			ResumePacket resume = new ResumePacket(this.streamId,stanzasReceived);
+			this.tagWriter.writeStanzaAsync(resume);
+		} else if (this.streamFeatures.hasChild("bind") && shouldBind) {
 			sendBindRequest();
 			if (this.streamFeatures.hasChild("session")) {
+				Log.d(LOGTAG,"sending session");
 				IqPacket startSession = new IqPacket(IqPacket.TYPE_SET);
 				Element session = new Element("session");
 				session.setAttribute("xmlns",
 						"urn:ietf:params:xml:ns:xmpp-session");
 				session.setContent("");
 				startSession.addChild(session);
-				sendIqPacket(startSession, null);
+				this.sendIqPacket(startSession, null);
-				tagWriter.writeElement(startSession);
+			}
+		}
 	}
-			Element presence = new Element("presence");
 
-			tagWriter.writeElement(presence);
+	private void sendInitialPresence() {
+		PresencePacket packet = new PresencePacket();
+		packet.setAttribute("from", account.getFullJid());
+		if (account.getKeys().has("pgp_signature")) {
+			try {
+				String signature = account.getKeys().getString("pgp_signature");	
+				Element status = new Element("status");
+				status.setContent("online");
+				packet.addChild(status);
+				Element x = new Element("x");
+				x.setAttribute("xmlns", "jabber:x:signed");
+				x.setContent(signature);
+				packet.addChild(x);
+			} catch (JSONException e) {
+				//
 			}
 		}
+		this.sendPresencePacket(packet);
+	}
 
 	private void sendBindRequest() throws IOException {
 		IqPacket iq = new IqPacket(IqPacket.TYPE_SET);
@@ -412,10 +476,15 @@ public class XmppConnection implements Runnable {
 						.getContent().split("/")[1];
 				account.setResource(resource);
 				account.setStatus(Account.STATUS_ONLINE);
+				if (streamFeatures.hasChild("sm")) {
+					EnablePacket enable = new EnablePacket();
+					tagWriter.writeStanzaAsync(enable);
+				}
+				sendInitialPresence();
+				sendServiceDiscovery();
 				if (statusListener != null) {
 					statusListener.onStatusChanged(account);
 				}
-				sendServiceDiscovery();
 			}
 		});
 	}
@@ -471,7 +540,7 @@ public class XmppConnection implements Runnable {
 		Log.d(LOGTAG, "processStreamError");
 	}
 
-	private void sendStartStream() {
+	private void sendStartStream() throws IOException {
 		Tag stream = Tag.start("stream:stream");
 		stream.setAttribute("from", account.getJid());
 		stream.setAttribute("to", account.getServer());
@@ -489,39 +558,36 @@ public class XmppConnection implements Runnable {
 	public void sendIqPacket(IqPacket packet, OnIqPacketReceived callback) {
 		String id = nextRandomId();
 		packet.setAttribute("id", id);
-		tagWriter.writeElement(packet);
+		this.sendPacket(packet, callback);
-		if (callback != null) {
-			packetCallbacks.put(id, callback);
-		}
 	}
 
 	public void sendMessagePacket(MessagePacket packet) {
-		this.sendMessagePacket(packet, null);
+		this.sendPacket(packet, null);
 	}
 
 	public void sendMessagePacket(MessagePacket packet,
 			OnMessagePacketReceived callback) {
-		String id = nextRandomId();
+		this.sendPacket(packet, callback);
-		packet.setAttribute("id", id);
-		tagWriter.writeElement(packet);
-		if (callback != null) {
-			packetCallbacks.put(id, callback);
-		}
 	}
 
 	public void sendPresencePacket(PresencePacket packet) {
-		this.sendPresencePacket(packet, null);
+		this.sendPacket(packet, null);
 	}
 
-	public PresencePacket sendPresencePacket(PresencePacket packet,
+	public void sendPresencePacket(PresencePacket packet,
 			OnPresencePacketReceived callback) {
-		String id = nextRandomId();
+		this.sendPacket(packet, callback);
-		packet.setAttribute("id", id);
+	}
-		tagWriter.writeElement(packet);
+	
-		if (callback != null) {
+	private synchronized void sendPacket(final AbstractStanza packet, PacketReceived callback) {
-			packetCallbacks.put(id, callback);
+		++stanzasSent;
+		tagWriter.writeStanzaAsync(packet);
+		if (callback != null) {
+			if (packet.getId()==null) {
+				packet.setId(nextRandomId());
+			}
+			packetCallbacks.put(packet.getId(), callback);
 		}
-		return packet;
 	}
 
 	public void setOnMessagePacketReceivedListener(
@@ -547,8 +613,23 @@ public class XmppConnection implements Runnable {
 		this.tlsListener = listener;
 	}
 
-	public void disconnect() {
+	public void disconnect(boolean force) {
+		Log.d(LOGTAG,"disconnecting");
+		try {
+		if (force) {
+				socket.close();
+		}
+		tagWriter.finish();
+		while(!tagWriter.finished()) {
+			Log.d(LOGTAG,"not yet finished");
+			Thread.sleep(100);
+		}
 		tagWriter.writeTag(Tag.end("stream:stream"));
+		} catch (IOException e) {
+			Log.d(LOGTAG,"io exception during disconnect");
+		} catch (InterruptedException e) {
+			Log.d(LOGTAG,"interupted while waiting for disconnect");
+		}
 	}
 	
 	public boolean hasFeatureRosterManagment() {
@@ -558,4 +639,8 @@ public class XmppConnection implements Runnable {
 			return this.streamFeatures.hasChild("ver");
 		}
 	}
+
+	public void r() {
+		this.tagWriter.writeStanzaAsync(new RequestPacket());
+	}
 }

src/eu/siacs/conversations/xmpp/stanzas/AbstractStanza.java

@@ -0,0 +1,34 @@
+package eu.siacs.conversations.xmpp.stanzas;
+
+import eu.siacs.conversations.xml.Element;
+
+public class AbstractStanza extends Element {
+
+	protected AbstractStanza(String name) {
+		super(name);
+	}
+
+	public String getTo() {
+		return getAttribute("to");
+	}
+
+	public String getFrom() {
+		return getAttribute("from");
+	}
+	
+	public String getId() {
+		return this.getAttribute("id");
+	}
+	
+	public void setTo(String to) {
+		setAttribute("to", to);
+	}
+	
+	public void setFrom(String from) {
+		setAttribute("from",from);
+	}
+	
+	public void setId(String id) {
+		setAttribute("id",id);
+	}
+}

src/eu/siacs/conversations/xmpp/stanzas/IqPacket.java

@@ -1,8 +1,7 @@
-package eu.siacs.conversations.xmpp;
+package eu.siacs.conversations.xmpp.stanzas;
 
-import eu.siacs.conversations.xml.Element;
 
-public class IqPacket extends Element {
+public class IqPacket extends AbstractStanza {
 	
 	public static final int TYPE_SET = 0;
 	public static final int TYPE_RESULT = 1;
@@ -33,8 +32,4 @@ public class IqPacket extends Element {
 		super("iq");
 	}
 
-	public String getId() {
-		return this.getAttribute("id");
-	}
-
 }

src/eu/siacs/conversations/xmpp/stanzas/MessagePacket.java

@@ -1,30 +1,18 @@
-package eu.siacs.conversations.xmpp;
+package eu.siacs.conversations.xmpp.stanzas;
 
 import eu.siacs.conversations.xml.Element;
 
-public class MessagePacket extends Element {
+public class MessagePacket extends AbstractStanza {
 	public static final int TYPE_CHAT = 0;
 	public static final int TYPE_UNKNOWN = 1;
 	public static final int TYPE_NO = 2;
 	public static final int TYPE_GROUPCHAT = 3;
 	public static final int TYPE_ERROR = 4;
 	
-	private MessagePacket(String name) {
-		super(name);
-	}
-	
 	public MessagePacket() {
 		super("message");
 	}
 	
-	public String getTo() {
-		return getAttribute("to");
-	}
-
-	public String getFrom() {
-		return getAttribute("from");
-	}
-	
 	public String getBody() {
 		Element body = this.findChild("body");
 		if (body!=null) {
@@ -34,14 +22,6 @@ public class MessagePacket extends Element {
 		}
 	}
 	
-	public void setTo(String to) {
-		setAttribute("to", to);
-	}
-	
-	public void setFrom(String from) {
-		setAttribute("from",from);
-	}
-	
 	public void setBody(String text) {
 		this.children.remove(findChild("body"));
 		Element body = new Element("body");

src/eu/siacs/conversations/xmpp/stanzas/PresencePacket.java

@@ -0,0 +1,9 @@
+package eu.siacs.conversations.xmpp.stanzas;
+
+
+public class PresencePacket extends AbstractStanza {
+	
+	public PresencePacket() {
+		super("presence");
+	}
+}

src/eu/siacs/conversations/xmpp/stanzas/streammgmt/AckPacket.java

@@ -0,0 +1,13 @@
+package eu.siacs.conversations.xmpp.stanzas.streammgmt;
+
+import eu.siacs.conversations.xmpp.stanzas.AbstractStanza;
+
+public class AckPacket extends AbstractStanza {
+
+	public AckPacket(int sequence) {
+		super("a");
+		this.setAttribute("xmlns","urn:xmpp:sm:3");
+		this.setAttribute("h", ""+sequence);
+	}
+
+}

src/eu/siacs/conversations/xmpp/stanzas/streammgmt/EnablePacket.java

@@ -0,0 +1,13 @@
+package eu.siacs.conversations.xmpp.stanzas.streammgmt;
+
+import eu.siacs.conversations.xmpp.stanzas.AbstractStanza;
+
+public class EnablePacket extends AbstractStanza {
+
+	public EnablePacket() {
+		super("enable");
+		this.setAttribute("xmlns","urn:xmpp:sm:3");
+		this.setAttribute("resume", "true");
+	}
+
+}

src/eu/siacs/conversations/xmpp/stanzas/streammgmt/RequestPacket.java

@@ -0,0 +1,12 @@
+package eu.siacs.conversations.xmpp.stanzas.streammgmt;
+
+import eu.siacs.conversations.xmpp.stanzas.AbstractStanza;
+
+public class RequestPacket extends AbstractStanza {
+
+	public RequestPacket() {
+		super("r");
+		this.setAttribute("xmlns","urn:xmpp:sm:3");
+	}
+
+}

src/eu/siacs/conversations/xmpp/stanzas/streammgmt/ResumePacket.java

@@ -0,0 +1,14 @@
+package eu.siacs.conversations.xmpp.stanzas.streammgmt;
+
+import eu.siacs.conversations.xmpp.stanzas.AbstractStanza;
+
+public class ResumePacket extends AbstractStanza {
+
+	public ResumePacket(String id, int sequence) {
+		super("resume");
+		this.setAttribute("xmlns","urn:xmpp:sm:3");
+		this.setAttribute("previd", id);
+		this.setAttribute("h", ""+sequence);
+	}
+
+}