RFID in Java ME
Article Metadata
JSR 257
RFID
• RFID (Radio Frequency IDentification) is a technology to carry information over short range by radio waves
• 13.56 MHz frequency used in mobile devices
• A tag (transponder) contains digital information in a microchip
• A reader communicates with a tag
• Two types of tags
• Active tag has own power source and longer distance
• Passive tag gets power from the incoming signa
NFC and NFC Forum
• NFC (Near Field Communication) specifies
simple wireless communication between close coupled devices
• Establishing other types of wireless communication between devices
• Compatibility with existing contactless smart cards
• NFC Forum defines common protocols for basic links between NFC enabled devices
• NFC Forum Data Exchange Format (NDEF) provides vendor independent structure for data
Visual Tags in Brief
''''• Optically machine readable information on printed material, typically in the form of bar codes or data matrices
• Widely used in product identification
• Symbology defines the features of the visual tag
• Used character set
• Encoding and decoding rules
• Data size
• Error checking
• Printing requirements
• Over 200 known symbologies, only few widely used
• UPC / EAN / JAN in article numbering
Use Cases for JSR 257
• Read a URL to movie web page from a tag
• Store personal shortcuts like phone numbers to a tag
• Bluetooth or WLAN connection initiation in a multiplayer game with RFID communication
• Set device access point settings from a tag
• Field force on-the-job reporting using RFID tags
• Data gathering from RFID tags to a server
Design Guidelines
• Select target and register for discovery
• Supported targets: NDEF tag, RFID tag, smart card, visual tag
• Read only or also write access to NDEF tag
• Limitations in registration
• Target discovered, check properties
• Open connection to target
• Communicate with the target
• Close connection
