do not attempt resume when already in smacks session

src/main/java/eu/siacs/conversations/utils/XmlHelper.java

@@ -1,5 +1,11 @@
 package eu.siacs.conversations.utils;
 
+import com.google.common.base.Joiner;
+import com.google.common.collect.Lists;
+
+import java.util.Collections;
+import java.util.List;
+
 import eu.siacs.conversations.xml.Element;
 
 public class XmlHelper {
@@ -14,17 +20,12 @@ public class XmlHelper {
     }
 
     public static String printElementNames(final Element element) {
-		final StringBuilder builder = new StringBuilder();
-		builder.append('[');
-		if (element != null) {
-			for (Element child : element.getChildren()) {
-				if (builder.length() != 1) {
-					builder.append(',');
-				}
-				builder.append(child.getName());
-			}
-		}
-		builder.append(']');
-		return builder.toString();
+        final List<String> features =
+                element == null
+                        ? Collections.emptyList()
+                        : Lists.transform(
+                                element.getChildren(),
+                                child -> child != null ? child.getName() : null);
+        return Joiner.on(", ").join(features);
     }
 }

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

@@ -817,7 +817,7 @@ public class XmppConnection implements Runnable {
         this.stanzasReceived = 0;
         this.inSmacksSession = true;
         final RequestPacket r = new RequestPacket();
-        // tagWriter.writeStanzaAsync(r);
+        tagWriter.writeStanzaAsync(r);
     }
 
     private void processResumed(final Element resumed) throws StateChangingException {
@@ -1180,7 +1180,8 @@ public class XmppConnection implements Runnable {
                 && isSecure) {
             authenticate(SaslMechanism.Version.SASL);
         } else if (this.streamFeatures.hasChild("sm", Namespace.STREAM_MANAGEMENT)
-                && streamId != null) {
+                && streamId != null
+                && !inSmacksSession) {
             if (Config.EXTENDED_SM_LOGGING) {
                 Log.d(
                         Config.LOGTAG,
@@ -1208,7 +1209,7 @@ public class XmppConnection implements Runnable {
                     Config.LOGTAG,
                     account.getJid().asBareJid()
                             + ": received NOP stream features "
-                            + this.streamFeatures);
+                            + XmlHelper.printElementNames(this.streamFeatures));
         }
     }
 
@@ -1295,7 +1296,6 @@ public class XmppConnection implements Runnable {
                         + "/"
                         + saslMechanism.getMechanism());
         authenticate.setAttribute("mechanism", saslMechanism.getMechanism());
-        Log.d(Config.LOGTAG, "authenticate " + authenticate);
         tagWriter.writeElement(authenticate);
     }
 
@@ -1310,7 +1310,7 @@ public class XmppConnection implements Runnable {
             features.addChild("enable", Namespace.CARBONS);
         }
         if (bindFeatures.contains(Namespace.STREAM_MANAGEMENT)) {
-            features.addChild("enable", Namespace.STREAM_MANAGEMENT);
+            features.addChild(new EnablePacket());
         }
         return bind;
     }
@@ -2365,8 +2365,8 @@ public class XmppConnection implements Runnable {
 
         private boolean hasDiscoFeature(final Jid server, final String feature) {
             synchronized (XmppConnection.this.disco) {
-                return connection.disco.containsKey(server)
-                        && connection.disco.get(server).getFeatures().contains(feature);
+                final ServiceDiscoveryResult sdr = connection.disco.get(server);
+                return sdr != null && sdr.getFeatures().contains(feature);
             }
         }