def accept_subscription(&blk)
      pres = connection.presence_stanza('to'=>jid.bare, 'type' => 'subscribed')
      connection.send_stanza pres, &blk
    end
def accept_subscription(&blk)
      pres = connection.presence_stanza('to'=>jid.bare, 'type' => 'subscribed')
      connection.send_stanza pres, &blk
    end
send a subscription stanza to accept an incoming subscription request