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Structure of a session:
session {
-- properties --
conn -- the tcp connection
notopen -- true if stream has not been initiated, removed after receiving <stream:steam>
type -- the connection type. Valid values include:
-- "c2s_unauthed" - connection has not been authenticated yet
-- "c2s" - from a local client to the server
username -- the node part of the client's jid (not defined before auth)
host -- the host part of the client's jid (not defined before stream initiation)
resource -- the resource part of the client's full jid (not defined before resource binding)
full_jid -- convenience for the above 3 as string in username@host/resource form (not defined before resource binding)
priority -- the resource priority, default: 0
presence -- the last non-directed presence with no type attribute. initially nil. reset to nil on unavailable presence.
interested -- true if the resource requested the roster. Interested resources receive roster updates. Initially nil.
roster -- the user's roster. Loaded as soon as the resource is bound (session becomes a connected resource).
-- methods --
send(x) -- converts x to a string, and writes it to the connection
close(x) -- Disconnect the user and clean up the session, best call sessionmanager.destroy_session() instead of this in most cases
}
if session.full_jid (also session.roster and session.resource) then this is a "connected resource"
if session.presence then this is an "available resource" (all available resources are connected resources)
if session.interested then this is an "interested resource" (all interested resources are connected resources)
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