Class: NMEAPlus::Message::AIS::VDMPayload::VDMMsg6d1022f61

Inherits:
VDMMsg6DynamicPayload show all
Defined in:
lib/nmea_plus/message/ais/vdm_payload/vdm_msg6d1022f61.rb

Overview

Type 6: Binary Addressed Message Subtype: Sealite SL125 Lantern or 155 Apollo Lantern This message has an ascii CSV payload wrapped in an armored AIS payload, wrapped in the NMEA CSV payload.

Instance Attribute Summary collapse

Attributes inherited from Payload

#fill_bits, #payload_bitstring

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Payload

#_2b_data_string, #_6b_ascii, #_6b_boolean, #_6b_integer, #_6b_integer_scaled, #_6b_integer_scaled_shifted, #_6b_negated_boolean, #_6b_string, #_6b_string_nullterminated, #_6b_unsigned_integer, #_6b_unsigned_integer_scaled, #_6b_unsigned_integer_scaled_shifted, #_8b_data_string, #_access, #_bit_slices, #_get_date_mdhm, #_object_by_name, payload_reader

Constructor Details

#initialize ⇒ VDMMsg6d1022f61 



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# File 'lib/nmea_plus/message/ais/vdm_payload/vdm_msg6d1022f61.rb', line 12

def initialize
  super
  @fields = []
end

Instance Attribute Details

#application_data ⇒ String (readonly)

The raw payload: comma separated ascii fields



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# File 'lib/nmea_plus/message/ais/vdm_payload/vdm_msg6d1022f61.rb', line 19

payload_reader :application_data, 88, 384, :_T

#battery_flat? ⇒ bool (readonly) 



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# File 'lib/nmea_plus/message/ais/vdm_payload/vdm_msg6d1022f61.rb', line 55

bit_reader :battery_flat?, 6

#battery_low? ⇒ bool (readonly) 



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# File 'lib/nmea_plus/message/ais/vdm_payload/vdm_msg6d1022f61.rb', line 56

bit_reader :battery_low?, 7

#battery_voltage ⇒ Float (readonly)

The battery voltage in volts



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# File 'lib/nmea_plus/message/ais/vdm_payload/vdm_msg6d1022f61.rb', line 100

def battery_voltage
  @fields[3].nil? ? nil : @fields[3].to_f
end

#flash_code ⇒ String (readonly)

A vendor-specific code



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# File 'lib/nmea_plus/message/ais/vdm_payload/vdm_msg6d1022f61.rb', line 93

def flash_code
  @fields[2].nil? ? nil : @fields[2].hex
end

#gps_off_station? ⇒ bool (readonly) 



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# File 'lib/nmea_plus/message/ais/vdm_payload/vdm_msg6d1022f61.rb', line 50

bit_reader :gps_off_station?, 1

#gps_sync_valid? ⇒ bool (readonly) 



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# File 'lib/nmea_plus/message/ais/vdm_payload/vdm_msg6d1022f61.rb', line 52

bit_reader :gps_sync_valid?, 3

#gps_valid? ⇒ bool (readonly) 



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# File 'lib/nmea_plus/message/ais/vdm_payload/vdm_msg6d1022f61.rb', line 53

bit_reader :gps_valid?, 4

#intensity_percent ⇒ Float (readonly)

This field seems to be a 0-100% value encoded as 6-bit. The test cases seem to indicate that it is offset by +1.5625, which may mean that “3F” is a special case. But I have no data on that.



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# File 'lib/nmea_plus/message/ais/vdm_payload/vdm_msg6d1022f61.rb', line 84

def intensity_percent
  return nil if @fields[1].nil?

  (1 + (@fields[1].hex & "3F".hex)) * (100.0 / (2**6))
end

#latitude ⇒ Float (readonly)

Latitude



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# File 'lib/nmea_plus/message/ais/vdm_payload/vdm_msg6d1022f61.rb', line 107

def latitude
  parts = @fields[4]
  return nil if parts.nil?

  NMEAPlus::Message::Base.degrees_minutes_to_decimal(parts[0..-1], parts[-1])
end

#light_sensor_dark? ⇒ bool (readonly) 



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# File 'lib/nmea_plus/message/ais/vdm_payload/vdm_msg6d1022f61.rb', line 51

bit_reader :light_sensor_dark?, 2

#longitude ⇒ Float (readonly)

Longitude



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# File 'lib/nmea_plus/message/ais/vdm_payload/vdm_msg6d1022f61.rb', line 117

def longitude
  parts = @fields[5]
  return nil if parts.nil?

  NMEAPlus::Message::Base.degrees_minutes_to_decimal(parts[0..-1], parts[-1])
end

#operation_mode ⇒ Integer (readonly)

Operation mode (integer code)



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# File 'lib/nmea_plus/message/ais/vdm_payload/vdm_msg6d1022f61.rb', line 61

def operation_mode
  return nil if @fields[1].nil?

  @fields[1].hex >> 6
end

#operation_mode_description ⇒ String (readonly)

A human-readable description of the operation mode



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# File 'lib/nmea_plus/message/ais/vdm_payload/vdm_msg6d1022f61.rb', line 70

def operation_mode_description
  case operation_mode
  when 1 then "Standby"
  when 2 then "Always on"
  else
    "description n/a" # TODO
  end
end

#supply_fail? ⇒ bool (readonly) 



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# File 'lib/nmea_plus/message/ais/vdm_payload/vdm_msg6d1022f61.rb', line 49

bit_reader :supply_fail?, 0

#temperature_sensor_hot? ⇒ bool (readonly) 



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# File 'lib/nmea_plus/message/ais/vdm_payload/vdm_msg6d1022f61.rb', line 54

bit_reader :temperature_sensor_hot?, 5

Class Method Details

.bit_reader(name, position) ⇒ void

This method returns an undefined value.

Enable a shortcut syntax for bit field attributes, in the style of ‘attr_accessor` metaprogramming. This is used to create a named field pointing to a specific bit in the first field of the payload



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# File 'lib/nmea_plus/message/ais/vdm_payload/vdm_msg6d1022f61.rb', line 45

def self.bit_reader(name, position)
  define_method(name) { self.send(:_field0_bit, position) }
end

Instance Method Details

#_field0_bit(position) ⇒ bool

Return a bit from the 8 bits in field 0



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# File 'lib/nmea_plus/message/ais/vdm_payload/vdm_msg6d1022f61.rb', line 30

def _field0_bit(position)
  return nil if @fields[1].nil?

  mask = 1 << (7 - position)
  @fields[0].hex & mask == mask
end

#payload_bitstring=(val) ⇒ Object

Override default bitstring setting to automatically load up a fields array for easier access



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# File 'lib/nmea_plus/message/ais/vdm_payload/vdm_msg6d1022f61.rb', line 22

def payload_bitstring=(val)
  super
  @fields = application_data.split(",")
end