Class: HcitoolsWrapper::Detect

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

Instance Method Summary collapse

Constructor Details

#initialize(bd_address: '', interval: 0, verbose: false) ⇒ Detect

Returns a new instance of Detect.



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# File 'lib/hcitools_wrapper.rb', line 34

def initialize(bd_address: '', interval: 0, verbose: false)

  @bd_address = bd_address      
  @interval = interval
  @verbose = verbose

end

Instance Method Details

#start ⇒ Object 



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# File 'lib/hcitools_wrapper.rb', line 42

def start()

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

  t3 = Time.now + @interval

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

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

      if t3 <= Time.now then

        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 >= 60

        # the RSSI will vary by up to 10 when the device is stationary
        if recent_movement or a.length > 10 or rssi > (a.max + 10) or rssi < (a.min - 10) then

          puts 'movement!' if @verbose
          
          if block_given? then
            yield a, avg
          end

          a = []
        end

        t3 = Time.now + @interval
      end
      
      last_found = Time.now

      false

    else
      x.include?(id)
    end

  end

end