物聯網（Internet of Things, IOT）時代的興起，不僅人跟人之間可以透過網路相互聯繫外，人跟物品、物品與物品之間，也可以透過網路環境互通。當許多設備或物品都可以連上Internet時，我們開始思考著一件事，如果可以用即時通訊（Instant Messaging，簡稱IM）軟體，如MSN、Skype、Google Talk之類的軟體和我們的機器進行對話，不就可以達成即時的Internet遠端設備監控。本組的專題就對此一機制將它具體實現。 2012/11/28 (三) 艾鍗學院嵌入式Linux軟韌體就業專班成果展--利用IM進行遠端設備控制 更多資訊參考艾鍗BLOG http://sites.powercam.cc/board.php?courseID=143&f=doc&cid=9404

1. 101年嵌入式Linux系統開發就業班
運用即時通訊服務進行遠端設備控制
Use Instant Message Services to Control Remote
Devices
成員: 林正育、劉乃文、賴彥翔
11/28/2012

2. Outline
Project Objectives
Achievement
System Architecture
Features of The System
System Components
Data Flow Examples
DEMO
Q&A

3. Can We Use A Cell Phone to Control A Devices Over
The Internet Cloud?

4. Objectives
Use an IM (Instant Message) protocol to
control devices on an embedded system.
Control the embedded devices remotely
through internet.
Minimum system administration efforts.
Flexible to change the configuration without
re-compiling and re-start the daemon.

5. Achievement
Study XMPP (Extensible Messaging and
Presence Protocol) specifications (RFC’s).
Select an XMPP server on internet.
Understand the usage of the XMPP services.
Design the architecture of the control protocol.
Implement the ITRC (IT Remote Control) on
ARM embedded system.
Successfully test and prove the architecture.

6. System Architecture
Linux Embedded System
Cell Phone/PC
Device
Send command in Extract command from 1
xmpp format xmpp and launch command
Execute command and
Google Itrcd print results
Talk Internet (Remote
Client Control Device
Daemon) 2
Receive the
Return the results
execution results
in xmpp format
Other components:
1> itdevconfig
Device
2> itdevlist 3
3> .itrclogin
4> .itrcdev

7. Features of The System
Comply with open standard
• Use IETF XMPP as the communication protocol.
Effortless to maintain and operate
• Leverage Google IM services.
• Use Google Talk as client software.
Flexible to integrate with other devices
• ITRCD does not need the knowledge of devices
• Design ITRCD protocol to communicate with devices
Portable to different embedded systems
• Develop in C the native language used in Linux.

8. System Components
itrcd: a daemon process to provide remote
shell capability for Google Talk clients.
itdevconfig: manage the device list in the
configuration file.
itdevlist: retrieve the device information in the
configuration file.
.itrclogin: XMPP login information file.
.itrcdev: device configuration file.

9. itrcd
Run on the same embedded system with the
devices to be controlled.
Authenticate and login to Google Talk XMPP
server.
Run the commands sent from the Gtalk clients
through XMPP Message protocol.
Return the output of the commands back to
Gtalk clients.

10. itdevadd
A program can be run by a user on the
embedded system.
Provides text user interface for user to
manage the configuration file.
Users can add, delete, modify, and list the
devices which will be controlled by ITRC.

11. itdevlist
A program sit on the embedded system.
Read the configuration file and print out the
device list with device_id, device_name,
device_cmmand for each device.
Gtalk client can send this command to get the
device information and use it to control the
devices.

12. .itrclogin
A hidden file on embedded system.
Contain jid and passoword to login to XMPP
server.
The format is jid:password in one line for each
user login information.

13. .itrcdev
A hidden file on embedded system.
Contain device information for the devices on
the embedded system.
The format is
device_id:device_name:device_command in
one line for each device.

14. ITRCD Protocol
step Gtalk Client ITRCD
1 Itdevlist return device information to Gtalk client
2 <device_command> help return the usage information
3 “<device_command> Execute the command on the device
<operation> accordingly and return the results.
[parameter] ..”
4 Repeat step 2 or step 3
disconnect close the stream session and terminate ITRCD

15. State Diagram of ITRCD Protocol
Remote Google Talk Client ITRCD Device
Send “itdevlist”
Return available devices and commands
Send “<command> help”
Launch “<command> help”
Execute “<command> help”
Print the usage information
Return the usage information
Send “<command> <op> <para> …”
Launch “<command> <op> <para>…”
Execute“<command> <op> <para>…”
Print the results
Return the results

16. Data Flow Example
Gtalk Client: send “itdevlist”
itrcd: run “itdevlist” and return device information to Gtalk client.
Gtalk Client: send “<device_command> help”
ITRCD: run “<device_command> help”
Device Program: print the usage information.
ITRCD: return the usage information to Gtalk client.
Gtalk Client: send “<device_command> <operation>
<parameter> ..”
ITRCD: run “<device_command> <operation> <parameter> ..”
Device Program: execute the command on the device accordingly
and print the results.
ITRCD: return the result back to Gtalk client.

17. Demo Screenshot

18. Q&A