Am Montag 04 Oktober 2010, 19:18:22 schrieb Sabahattin Gucukoglu:

Hi,

Well,  Steve Jobs is partly correct. (I avoided bothering him with my 
response)

On one hand IMAP IDLE has absolute minimal requirements with regards to 
protocol complexity which helps preserving power.

On the other hand IMAP IDLE is so limited in features that it has also 
negative effects on resource usage including user experience and power 
consumption.

1. IMAP IDLE can only monitor a single folder. Using multiple connections in 
order to circumvent this limitation is inefficient.

-->3 years ago I drafted an RFC which tries to solve this issue while 
remaining simple. 

http://www.erfrakon.de/konold/draft-konold-imap-idleplus-05.txt

2. IMAP IDLE lacks support for non mail folders e.g. clients are interested in 
watching calendars, addressbooks, todos etc.

--> I tired successfully with warpping these groupware related objects as XML 
objects within imap messages  (Kolab architecture)

http://kolab.org/doc/concept-draft-cvs20060921.pdf

3. IMAP IDLE requires a permanent stateful TCP connection and has no support 
for efficient reconnects. This means that clients cannot switch off the IP 
stack in order to preserve power and that loss of connection leads to extra 
bandwidth and processing requirements. This is not only bad for mobile 
clients.

All the above issues are tried to be addressed by the LEMONADE group e.g.  
IMAP CONDSTORE.

http://www.lemonadeformobiles.com/quick.html and 
http://datatracker.ietf.org/wg/lemonade/charter/

I am personally not really happy about the technical approach and progress 
sofar but I have been told by others who know much better than me to stop my 
above efforts and wait patiently for the results of the LEMONADE group.

Yours,
-- martin

-- 
e r f r a k o n
Erlewein, Frank, Konold & Partner - Beratende Ingenieure und Physiker
Sitz: Adolfstraße 23, 70469 Stuttgart, Partnerschaftsregister Stuttgart PR 126
http://www.erfrakon.com/
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