Bluetooth Application

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Bluetooth Application

• Safa Rahimi Movaghar

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Different Bluetoth Stacks

• AxisOpenBT
• Bluedrekar
• BlueZ
• Avelink
• cstack
• Ericsson
• Mitsumi

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OpenBT Stack

• Lan Access Profile on Linux
• PPP server over RFCOMM
• RFCOMM connections between devices
• Provide SDP server
• Browse SDP database on a target device

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Kernel Bluetooth Driver

• Terminal driver connectionless data stream over
  some type of device e.g. open, close, write,
  read, select and ioctl system calls.
• Line discipline monitors modifies data stream
  on terminal. bt_ldisc route all data to and from
  serial port through the Bluetooth driver
• tty_io
• n_tty
• bt Serial Driver
• bt_ldisc

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Device file /sev/ttyBTC

• Controls the kernel driver by ioctl calls.
• Initialization
• baud rate
• hardware flow control
• Security
• Connection
• Hardware control
• Shut down

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Multiple RFCOMM Connections

• Device A Device B
• client app server app
• /dev/ttyBT0 /dev/ttyBT0 /dev/ttyBT1
• session 0 session 0 session 1
• Other device

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OpenBT application