Class: HcitoolsWrapper::Detect

Inherits:
Object
  • Object
show all
Defined in:
lib/hcitools_wrapper.rb

Instance Method Summary collapse

Constructor Details

#initialize(bd_address: '', refreshinterval: 60, verbose: false) ⇒ Detect

Returns a new instance of Detect.



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# File 'lib/hcitools_wrapper.rb', line 38

def initialize(bd_address: '', refreshinterval: 60, verbose: false)

  @bd_address = bd_address      
  @refreshinterval = refreshinterval
  @verbose = verbose

end

Instance Method Details

#start ⇒ Object 



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# File 'lib/hcitools_wrapper.rb', line 46

def start()

  id = @bd_address.split(':').reverse.join(' ')
  found, last_found = false, Time.now - 60
  a = []


  IO.popen('sudo hcidump --raw').each_line do |x| 
    
    found = if found then

      rssi = (x.split.last.hex - 256)
      a << rssi unless a.include? rssi
      h = {bdaddress: @bd_address, rssi: rssi}

      avg = a.max + (a.min - a.max) / 2

      if @verbose then
        puts Time.now.inspect + ':  ' + h.inspect
        puts "max: %s, min: %s, average: %s, a: %s" % \
                                [a.max, a.min, avg, a.sort.inspect]

      end
      
      recent_movement = Time.now - last_found >= @refreshinterval

      # the RSSI will vary by up to 10 when the device is stationary
      if recent_movement or a.length > 10 then

        puts 'movement!' if @verbose
        
        if block_given? then
          yield( a, (rssi == a.min and rssi < -85) ? rssi : avg)
        end

        a = []
      end
    
      last_found = Time.now

      false

    else
      x.include?(id)
    end

  end

end