Class: FreestyleLibre::Reader

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

Constant Summary collapse

VENDOR_ID = 
0x1a61
PRODUCT_ID = 
0x3650
INIT_COMMAND_SEQUENCE = 
[0x04, 0x05, 0x15, 0x1]

Instance Method Summary collapse

Constructor Details

#initialize(interface = nil) ⇒ Reader

Returns a new instance of Reader.

Parameters:

  • interface (Number) (defaults to: nil) —

    The interface number of the device; needed in case you have several readers connected



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# File 'lib/freestyle_libre/reader.rb', line 9

def initialize(interface = nil)
  HIDAPI::SetupTaskHelper.new(VENDOR_ID, PRODUCT_ID, "abbott-freestyle-libre", interface).run
  @device = HIDAPI::open(VENDOR_ID, PRODUCT_ID, interface)
  raise 'device could not be opened' unless @device

  INIT_COMMAND_SEQUENCE.each do |c|
    write_report(c, '')
    read_report
  end
end

Instance Method Details

#arresult ⇒ Record

Manual measurements and date/time changes

Returns:



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# File 'lib/freestyle_libre/reader.rb', line 81

def arresult
  write_report(0x60, '$arresult?')
  read_multi.map { |record| ar(record) }.compact
end

#close ⇒ Object 



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# File 'lib/freestyle_libre/reader.rb', line 86

def close
  @device.close
end

#database_record_number ⇒ Object

latest record ID ???



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# File 'lib/freestyle_libre/reader.rb', line 65

def database_record_number
  # TODO: not sure this matches the description.
  # We should check that by scanning the tag two times and seeing that the number of new history
  # matches the increase of this number
  write_report(0x60, '$dbrnum?')
  read_text_command.gsub('DB Record Number =', '').strip.to_i
end

#date_time ⇒ Object 



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# File 'lib/freestyle_libre/reader.rb', line 30

def date_time
  write_report(0x60, '$date?')
  date = read_text_command.strip
  write_report(0x60, '$time?')
  DateTime.strptime("#{date} #{read_text_command}", '%m,%d,%y %H,%M')
end

#date_time=(value) ⇒ Object 



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# File 'lib/freestyle_libre/reader.rb', line 37

def date_time=(value)
  write_report(0x60, "$date,#{value.strftime('%-m,%-d,%y')}")
  read_text_command
  write_report(0x60, "$time,#{value.strftime('%H,%M')}")
  read_text_command
end

#history ⇒ Object

Automatic glucose measurements



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# File 'lib/freestyle_libre/reader.rb', line 74

def history
  write_report(0x60, '$history?')
  read_multi.map { |record| auto_measurement(record) }
end

#patient_id ⇒ Object 



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# File 'lib/freestyle_libre/reader.rb', line 59

def patient_id
  write_report(0x60, '$ptid?')
  read_text_command.strip
end

#patient_id=(value) ⇒ Object 



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# File 'lib/freestyle_libre/reader.rb', line 54

def patient_id=(value)
  write_report(0x60, "$ptid,#{value}")
  read_text_command
end

#patient_name ⇒ Object 



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# File 'lib/freestyle_libre/reader.rb', line 49

def patient_name
  write_report(0x60, '$ptname?')
  read_text_command.strip
end

#patient_name=(value) ⇒ Object 



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# File 'lib/freestyle_libre/reader.rb', line 44

def patient_name=(value)
  write_report(0x60, "$ptname,#{value}")
  read_text_command
end

#serial ⇒ Object 



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# File 'lib/freestyle_libre/reader.rb', line 20

def serial
  write_report(0x60, '$sn?')
  read_text_command.strip
end

#software_version ⇒ Object 



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# File 'lib/freestyle_libre/reader.rb', line 25

def software_version
  write_report(0x60, '$swver?')
  read_text_command.strip
end