A few comments on XEP-0047... First, it might be useful if the error for "block size too big" provided more detailed information, because right now the recipient can't tell the sender what block size would be acceptable (e.g., if the sender proposes a block size of 4096 and the recipient returns an error, the initiator might then try a block size of 2048 but the receiver might still return an error; that seems to require too many round trips). I propose that we add an application-specific error condition that specifies the preferred block size:
<iq from='[email protected]/balcony' id='jn3h8g65' to='[email protected]/orchard' type='error'/> <error type='modify'> <resource-constraint xmlns='urn:ietf:params:xml:ns:xmpp-stanzas'/> <pref xmlns='http://jabber.org/protocol/ibb' block-size='1024'/> </error> </iq> Second, if the recipient detects an error with a data packet, the spec says that it SHOULD (not MUST) return an error and is silent about the number of retries that are appropriate, whether the recipient needs to close the session at some point, etc. One option would be to say that the recipient MUST return an error and close the session if it detects a problem with a data packet. Another would be to more carefully specify the retry logic. Do folks on this list have a preference? Peter -- Peter Saint-Andre https://stpeter.im/
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