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Cloud Computing intends a trend in computing model arises many security issues in all levels such as: network, application, data and host.
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Description of Security of Cloud Computing Survey (Scientific Paper) published at International Journal of Computer Science and Information Security journal
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Bacdroid
1. BACdroid
A versatile platform for building automation
Markus Jung, Christian Mauser, Wolfgang Kastner
Institute of Computer Aided Automation
Automation Systems Group
Vienna University of Technology
Vienna, Austria
14.03.2012 https://www.auto.tuwien.ac.at
2. Agenda
BACnet in a nutshell
BACdroid – BACnet stack on Android
Integration scenarios in
building automation
CCTV example use case
Conclusion & outlook
markus.jung@tuwien.ac.at
7. in a Nutshell
Management
Tier
Automation
Modbus
Tier
Field SBT P1 JCI N2
Tier
markus.jung@tuwien.ac.at
8. in a Nutshell
Communication protocol for „Building automation and
control network“
Vendor independent
Defines network view and topology for process- and
control data (HVAC, Lighting, Security, Safety)
Defines services for data access
User application „out of scope“
Typically used in management and automation tier
markus.jung@tuwien.ac.at
9. History
1987: Start of development by American Society of
Heating, Refrigerating and Air-Condition Engineers
(ASHRAE)
1995: First ANSI/ASHRAE Standard 135
2003: First ISO 16484-5
Building Automation and Control Systems (BACS) – Part 5:
Data Communication Protocol
Continuously developments and additions to the current
standard (BACnet addendum)
Latest standard: ANSI/ASHRAE 135 – 2008 „BACnet 2008“
markus.jung@tuwien.ac.at
10. Layers
BACnet networks are local networks
Typically small messages are exchanged
Low protocol overhead
Sequence control, segmentation, flow control application layer
Various transport media possible
BACnet/IP uses BACnet Virtual Link Layer on top of UDP/IP
markus.jung@tuwien.ac.at
11. Network Topology
Physical segments are extended using
repeaters.
Physical Segments are connected
using bridges forming a network with
single MAC address domain.
Multiple networks are connected
through routers forming a BACnet
Internetwork, probably with different
transport media (Ethernet, MS/TP,
Lon, BACNet/IP,..:) used by the
networks
markus.jung@tuwien.ac.at
12. Application Layer
Process and control data is represented through objects
Application layer service provides access to the data and
additional functionalities, for example alarm or
management features.
User application not defined
No API defined
markus.jung@tuwien.ac.at
14. Services
Client/server based confirmed and unconfirmed services
Service groups (alarm and event services, file access
services, object access services, remote device
management services, virtual terminal services)
Example - object access service provides the generic
operations CreateObject, DeleteObject, ReadProperty,
WriteProperty, AddListElement
Remote device management:
Who-Has, I-Have, Who-Is, I-AM
markus.jung@tuwien.ac.at
15. BACdroid
Port of the BACnet I/P for Java[1] stack for Android
Stack in general compatible with Android Java
Minor compatibility issues fixed
Android platform 2.1 – API Level 7
Closed library: seroUtils.jar decompiled, compile issues
fixed
markus.jung@tuwien.ac.at
17. Use Case: CCTV integration in BACnet
Integration of CCTV in BACnet
Embedded device equipped with camera detects safety
and security events
[2] [3] [4]
Local detection allows to avoid video stream traffic and
reduces privacy concerns
markus.jung@tuwien.ac.at
19. Camera Event Object
Property Identifier Property Data Type
Object_Identifier BACnetObjectIdentifier
Object_Name CharacterString
Object_Type BACnetObjectType
Description CharacterString
Event_Type_List List of BACnetCameraEventType
Event_Deadline_List List of BACnetDateTime
Event_File_ID_List List of BACnetDateTime
Latest_Camera_Event BACnetDateTime
Events stored in a ring-buffer data structure, accessible
through lists
Latest_Camera_Event used for Change-of-Value notification
markus.jung@tuwien.ac.at
23. Conclusion & Outlook
Native interaction with building automation based on
BACnet/IP
Ad-hoc access for system operator with Android device
Use case CCTV integration in BACnet
Outlook
Integration of sensors and actuators running on
Android devices
New scenarios for interaction with building
automation
markus.jung@tuwien.ac.at
24. Conclusion & Outlook
Native interaction with building automation based on
BACnet/IP
Ad-hoc access for system operator with Android device
Use case CCTV integration in BACnet
Outlook
Integration of sensors and actuators running on
Android devices
New scenarios for interaction with building
automation
markus.jung@tuwien.ac.at
25. Acknowledgement
This work was funded by FFG (Austrian Research
Promotion Agency) under the Kiras project “Networked
miniSPOT” P824777.
markus.jung@tuwien.ac.at
26. References
[1] http://bacnet4j.sourceforge.net/
[2]http://www.exozet.com/index.php/effects/de/News/Det
ail/id/983
[3] http://www.securitysmarthome.com/blog/
[4]http://www.flickr.com/photos/dragonpreneur/37501227
96/
[5] http://www.bacnet.org/
[6] Christian Mauser, Wolfgang Granzer, and Wolfgang
Kastner. Integrating CCTV Systems into BACnet. In Proc. of
16th IEEE Conference on Emerging Technologies and
Factory Automation (ETFA '11), September 2011.
markus.jung@tuwien.ac.at