There are several of the
DTN Email system exists such as Bytewalla
5, DTNmailex and offline Gmail. Mail client for this
thesis offline email system, Bytewalla 5
and offline Gmail is a web based.
User can use a web browser to access the webmail. There are two mail servers
for the offline email system which is an offline local mail server and an online
local mail server. Bytewalla 5 also
has two mail servers which are offline DTN mail server and online DTN mail
server while there is only internet mail server available for offline Gmail.
DTN
implementation of this offline email system is based on TCP/IP. The advantage
of this approach is the user can use the offline email system as it was a
normal email system and may not even noticed it was a DTN email system. The Bytewalla 5 uses a native DTN
implementation designed by Delay Tolerant Networking Research Group (DTNRG)
while offline Gmail uses Google Gears.
This offline
email system use Windows operating system for its web server, mail server
application and database synchronization application. Bytewalla 5 uses Ubuntu 8.04 LTS a Linux operating system for its
DTN mail server and offline Gmail is
browser based where it use Google mail server.
Data mule for
being used is an android phone where it acts as an infomediary device. The Samba File sharing application is used
to enable a network storage connection with a mail server where it receives an
email data from database synchronization software to be sent to the destination
mail server. Bytewalla 5 also use
android phone as a data mule. It has three main applications running which is
DTNService for handling DTN communication, DTN Manager to configure, monitor
and manage DTNService and DTNApps (DTNSend for sending messages and DTNReceive
for receiving messages). Offline Gmail
use Web Browser with Google Gears to
store some online files to be used offline.
Temporary
storage location for a pending email data in this offline email system and Bytewalla 5 is stored in email server
computer while offline Gmail storage
is in the mail client computer. Endpoint ID for this offline email system and offline Gmail is a standard email
address where there is a local part, @ sign, and domain part. As an example:
test1@email.com. [19] . Table 4.2 shows a
comparison of this thesis project offline email system with Bytewalla 5 and offline Gmail.
|
DTN Email
Features
|
Offline
Email based on Delay Tolerant Network (DTN)
|
Bytewalla
5
|
Offline
Gmail
|
|
Mail
Client
|
Web based
|
Web based
|
Web based
|
|
Mail
Server
|
-Offline local mail
server
-Online local mail
server
|
-Offline DTN mail
server
-Online DTN mail
server
|
Internet mail server
|
|
DTN
implementation
|
TCP/IP based
|
Native DTN
|
Google Gears
|
|
Operating
System
|
Windows
|
Linux (Ubuntu 8.04
LTS)
|
Browser based
|
|
Data
mule
|
Android phone
running Samba File sharing
|
-Android phone
running DTNService for handling DTN communication, DTN Manager to configure,
monitor and manage DTNService, DTNApps (DTNSend for sending messages and
DTNReceive for receiving messages)
|
Web Browser with Google Gears
|
|
Temporary
Storage location
|
Email server
computer
|
Email server
computer
|
Email computer
client
|
|
Endpoint
ID
|
test1@email.com
|
dtn:pop:mailto:test1@email.com
|
test1@email.com
|
Table
4.2:
Comparison of DTN Email
Table 4.3 shows
the comparison of selected free web server Uniserver
7.1.4 and XAMPP 1.8.1. Both web servers
offer the same feature for a setting up a Windows home server. Uniserver has been selected because it
has a Cron feature which can be used with DtDNS service. Cron is a job
scheduler allowing scripts to be run automatically at a certain time or date.
It is used to update the external IP address of the server computer to the
DtDNS service.
|
Web server
Features
|
Uniserver
7.1.4
|
XAMPP
1.8.1
|
|
Size
(MB)
|
14.5
|
99.0
|
|
License
|
Berkeley Software
Distribution (BSD)
|
GNU General Public
License (GPL)
|
|
Apache
HTTP Server
|
2.2.19
|
2.4.3
|
|
PHP
|
5.4.8
|
5.4.7
|
|
MySQL
|
5.5.15
|
5.5.27
|
|
phpMyAdmin
|
3.4.3.2
|
3.5.2.2
|
|
OpenSSL
|
1.0.1c
|
1.0.1c
|
|
Portable
application
|
Yes + Multi server
|
Yes
|
|
Cron
|
Yes
|
No
|
Table
4.3:
Comparison of Web server
Table 4.4 shows
the comparison of mail server software for hMailServer,
AtMail and citadel. HMailServer is
selected since it is free, open source and Windows based application.
|
Mail Server
Features
|
hMailServer
|
AtMail
|
Citadel
|
|
Operating
System
|
Windows
|
Linux
|
Linux
|
|
SMTP
|
Yes
|
Yes
|
Yes
|
|
POP3
|
Yes
|
Yes
|
Yes
|
|
IMAP
|
Yes
|
Yes
|
Yes
|
|
Webmail
|
Yes
|
Yes
|
Yes
|
|
Database
|
Yes
|
Yes
|
Yes
|
|
License
|
GNU General Public
License (GPL)
|
Commercial
|
GNU General Public
License (GPL)
|
Table
4.4:
Comparison of Mail Server software
Table 4.5 shows
a comparison of free mail client for Roundcube
and SquirrelMail. Both Mail Clients
offer the same features. Either one can be used. Roundcube is selected for this thesis work.
|
Mail Client
Features
|
Roundcube
|
SquirrelMail
|
|
Operating
System
|
Cross platform
|
Cross platform
|
|
License
|
GNU General Public
License (GPL)
|
GNU General Public
License (GPL)
|
|
User
Interface
|
Web
|
Web
|
|
New
user registration
|
Yes by using a
plugin
|
Yes by using a
plugin
|
Table
4.5:
Comparison of Mail Client
Table 4.6 shows
comparison of File Synchronize software for FreeFilesync,
Synchronize It and rsync. FreeFilesync is selected for this thesis project because of it a
free Open Source for Windows and support for batch file for automated file synchronization.
|
File Synchronize
Features
|
FreeFilesync
|
Synchronize
It
|
rsync
|
|
Operating
System
|
Windows/Linux
|
Windows
|
Linux/Windows
|
|
License
|
GNU General Public
License (GPL)
|
Commercial
|
GNU General Public
License (GPL)
|
|
Portable
|
Yes
|
Yes
|
Yes
|
|
Detect
conflict
|
Yes
|
No
|
No
|
|
Detect
rename
|
Yes
|
No
|
No
|
|
Detect
move
|
Yes
|
No
|
No
|
|
Scheduling
|
Yes
|
Yes
|
No
|
Table
4.6:
Comparison of File Synchronize software
Table 4.7 shows
the comparison of the suggested infomediary device. Android phone is used in
this thesis work because of its size, weight and battery life.
|
Infomediary Device
Features
|
Android
phone
(LG
Optimus 3D P920)
|
Laptop
(Lenovo
Z460)
|
|
Battery
|
Li-Ion 1500 mAh
|
6-Cell Li-ion5200 mAh
|
|
Battery
Life
|
Standby up to 450 h
|
Standby 56Wh
|
|
Size
|
4.3”
|
14”
|
|
Weight
|
168g
|
2.24 Kg
|
|
Storage
|
8GB storage + 32GB MicroSD
|
500GB HDD
|
|
WLAN
|
Wi-Fi 802.11 b/g/n
|
Wi-Fi 802.11b/g/n
|
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