DZone Snippets: rfcomm code

Using Ruby to detect Bluetooth proximity

jrobertson (James Robertson) — Sun, 25 May 2008 10:57:00 GMT

This Ruby script uses the hcitool and rfcomm to detect the proximity of a bluetooth enabled mobile phone. The signal strength in this script will return a value from 0 to 10, 0 is near and 10 is far, otherwise if there is no connection it will keep on trying.



deviceid = '00:12:D1:E6:57:BE' 

range = ''

count = 0

while count < 1

  # assuming the bt device is already connected get the signal strength value.

  range = `hcitool rssi #{deviceid}`.chomp

  if  range.length > 0

    puts range[/\w+$/]

  else

    puts 'connecting to the bluetooth device ...'

    Thread.new{`rfcomm connect 0 #{deviceid}`}

  end

	

  sleep 7

end

warning (11-Jul-2008): I've found Thread.new to be causing a problem, it appears not to remove itself from the process queue when it is no longer required.

Simple Bluetooth Proximity

jrobertson (James Robertson) — Tue, 20 May 2008 22:39:59 GMT

Following on from my earlier investigation into bluetooth proximity, I wanted something which returned a value which could be used to determine distance. The output from hcitool rssi ranges from 0 for close object down to -10 for far away objects.



rfcomm connect 0 00:12:D1:E6:57:BE



hcitool rssi 00:12:D1:E6:57:BE

Proximity Results:
-4 .. 0 : Bedroom - nearest to my bed
-4 .. -6 : Hallway
-8 .. -9 : Livingroom - on the computer desk
-9 .. -10 : Livingroom - nearest to the window

PyS60 - SendFile

whitetiger () — Sun, 26 Nov 2006 21:12:40 GMT

// Send File over Bluetooth



from appuifw import *

from e32socket import *



try:

    phone = bt_obex_discover()

    file = query(u'File Selection', 'text')

    bt_obex_send_file(phone[0], phone[1].values()[0], file)

    note(u'File Sent')

except Exception, error:

    note(unicode(error), 'error')