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Enabling Message Carbons
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joelhess 2016-12-02, 16:18 #1
Member since Dec 2016 · 6 posts
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Subject: Enabling Message Carbons
Good day,

I'm trying to figure out the proper way to enable Message Carbons via the Xamarin SDK. I'm running the following code during the OnBind Event.

  1. var carbon = new IqQuery<Matrix.Xmpp.MessageCarbons.Enable>() { Type = Matrix.Xmpp.IqType.Set };
  2. _reconnectWrapper.Client.IqFilter.SendIq(carbon, Client_OnIq);

I see the server receive the request, but no response is sent back to the client. Is there a specific point in the sequence that this should happen?
From the server:
  1. 00:26:35.089 [debug] Received XML on stream = <<"<iq id=\"MX_3\" type=\"set\"><enable xmlns=\"urn:xmpp:carbons:2\" />   </iq>">>

I can confirm the server reports the capability and that other clients can use it.

Any help would be appreciated.

Thanks!
This post was edited on 2016-12-02, 16:27 by Alex.
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Alex 2016-12-02, 16:37 #2
Member since Feb 2003 · 4449 posts · Location: Germany
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Your code looks fine.
You should not send it before your resource is assigned. I would sent it after you get returned the initial presence from the server (OnInitialPresence).

Alex
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joelhess 2016-12-02, 17:03 #3
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Thanks Alex,

Playing around with it a little bit, I moved it after OnRosterEnd, and it seemed to work.

Joel
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Alex 2016-12-02, 19:15 #4
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ya, should be good as well. You need to have a resource assigned which happens after resource binding.

Alex
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joelhess 2016-12-02, 20:36 #5
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In reply to post #3
Follow up... I get the carbon messages now, and am parsing it apart.

Here's the message...
  1.  <message from="JID" to="JID" xmlns="jabber:client" type="chat">
  2.    <sent xmlns="urn:xmpp:carbons:2">
  3.      <forwarded xmlns="urn:xmpp:forward:0">
  4.        <message from="RESOURCE..." id="6c2126bc-20b8-4a33-b921-d2556fe923d6" to="resouce" type="chat" xmlns="jabber:client">
  5.          <body>blarg</body>
  6.        </message>
  7.      </forwarded>
  8.    </sent>
  9.  </message>

Here's my parsing...
  1.  
  2. if (e.Message.FirstXmppXElement is ForwardContainer)
  3. {
  4. var container = (ForwardContainer) e.Message.FirstXmppXElement;
  5. if (container.Forwarded != null)
  6. {
  7. //ProcessMessage....
  8. }

The forwarded object is coming up null. I can traverse the nodes to get at the message, but just wondering if I'm missing something.
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Alex 2016-12-02, 23:56 #6
Member since Feb 2003 · 4449 posts · Location: Germany
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looks like there was a change in this XEP since we implemented it. Its still not final and went through many revisions.
In the current code a namespace in Matrix is different. We have fixed this and will make it available soon with over NuGet.

Iuntil we publish new packages you can just overwrite the namespace in the Factory with the following code:

  1. RegisterElement<Xmpp.MessageCarbons.Forwarded>  (Namespaces.Forward, "forwarded");

Alex
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