Module: Meshtastic::MQTT

Defined in:
lib/meshtastic/mqtt.rb

Class Method Summary collapse

Class Method Details

.authors ⇒ Object

Author(s)

0day Inc. <support@0dayinc.com>



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# File 'lib/meshtastic/mqtt.rb', line 196

public_class_method def self.authors
  "AUTHOR(S):
    0day Inc. <support@0dayinc.com>
  "
end

.connect(opts = {}) ⇒ Object

Supported Method Parameters

mqtt_obj = Meshtastic::MQQT.connect(

host: 'optional - mqtt host (default: mqtt.meshtastic.org)',
port: 'optional - mqtt port (defaults: 1883)',
username: 'optional - mqtt username (default: meshdev)',
password: 'optional - (default: large4cats)'

)



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# File 'lib/meshtastic/mqtt.rb', line 24

public_class_method def self.connect(opts = {})
  # Publicly available MQTT server / credentials by default
  host = opts[:host] ||= 'mqtt.meshtastic.org'
  port = opts[:port] ||= 1883
  username = opts[:username] ||= 'meshdev'
  password = opts[:password] ||= 'large4cats'

  mqtt_obj = MQTTClient.connect(
    host: host,
    port: port,
    username: username,
    password: password
  )

  mqtt_obj.client_id = SecureRandom.random_bytes(8).unpack1('H*')

  mqtt_obj
rescue StandardError => e
  raise e
end

.disconnect(opts = {}) ⇒ Object

Supported Method Parameters

mqtt_obj = Meshtastic.disconnect(

mqtt_obj: 'required - mqtt_obj returned from #connect method'

)



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# File 'lib/meshtastic/mqtt.rb', line 185

public_class_method def self.disconnect(opts = {})
  mqtt_obj = opts[:mqtt_obj]

  mqtt_obj.disconnect if mqtt_obj
  nil
rescue StandardError => e
  raise e
end

.gps_search(opts = {}) ⇒ Object

Supported Method Parameters

mqtt_obj = Meshtastic.gps_search(

lat: 'required - latitude float (e.g. 37.7749)',
lon: 'required - longitude float (e.g. -122.4194)',

)



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# File 'lib/meshtastic/mqtt.rb', line 168

public_class_method def self.gps_search(opts = {})
  lat = opts[:lat]
  lon = opts[:lon]

  raise 'ERROR: Latitude and Longitude are required' unless lat && lon

  gps_arr = [lat.to_f, lon.to_f]

  Geocoder.search(gps_arr)
rescue StandardError => e
  raise e
end

.help ⇒ Object

Display Usage for this Module



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# File 'lib/meshtastic/mqtt.rb', line 204

public_class_method def self.help
  puts "USAGE:
    mqtt_obj = #{self}.connect(
      host: 'optional - mqtt host (default: mqtt.meshtastic.org)',
      port: 'optional - mqtt port (defaults: 1883)',
      username: 'optional - mqtt username (default: meshdev)',
      password: 'optional - (default: large4cats)'
    )

    #{self}.subscribe(
      mqtt_obj: 'required - mqtt_obj object returned from #connect method',
      root_topic: 'optional - root topic (default: msh)',
      region: 'optional - region (default: US)',
      channel: 'optional - channel name (default: LongFast)',
      psk: 'optional - channel pre-shared key (default: AQ==)',
      qos: 'optional - quality of service (default: 0)',
      json: 'optional - JSON output (default: false)',
      filter: 'optional - comma-delimited string(s) to filter on in message (default: nil)'
    )

    #{self}.gps_search(
      lat: 'required - latitude float (e.g. 37.7749)',
      lon: 'required - longitude float (e.g. -122.4194)',
    )

    mqtt_obj = #{self}.disconnect(
      mqtt_obj: 'required - mqtt_obj object returned from #connect method'
    )

    #{self}.authors
  "
end

.subscribe(opts = {}) ⇒ Object

Supported Method Parameters

Meshtastic::MQQT.subscribe(

mqtt_obj: 'required - mqtt_obj returned from #connect method'
root_topic: 'optional - root topic (default: msh)',
region: 'optional - region (default: US)',
channel: 'optional - channel name (default: LongFast)',
psk: 'optional - channel pre-shared key (default: AQ==)',
qos: 'optional - quality of service (default: 0)',
json: 'optional - JSON output (default: false)',
filter: 'optional - comma-delimited string(s) to filter on in message (default: nil)'

)



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# File 'lib/meshtastic/mqtt.rb', line 57

public_class_method def self.subscribe(opts = {})
  mqtt_obj = opts[:mqtt_obj]
  root_topic = opts[:root_topic] ||= 'msh'
  region = opts[:region] ||= 'US'
  channel = opts[:channel] ||= 'LongFast'
  psk = opts[:psk] ||= 'AQ=='
  qos = opts[:qos] ||= 0
  json = opts[:json] ||= false
  filter = opts[:filter]

  # TODO: Find JSON URI for this
  mqtt_path = "#{root_topic}/#{region}/2/json/#{channel}/#" if json
  mqtt_path = "#{root_topic}/#{region}/2/c/#{channel}/#" unless json
  puts "Subscribing to: #{mqtt_path}"
  mqtt_obj.subscribe(mqtt_path, qos)

  # Decrypt the message
  # Our AES key is 128 or 256 bits, shared as part of the 'Channel' specification.

  # Actual pre-shared key for LongFast channel
  psk = '1PG7OiApB1nwvP+rz05pAQ==' if channel == 'LongFast'
  padded_psk = psk.ljust(psk.length + ((4 - (psk.length % 4)) % 4), '=')
  replaced_psk = padded_psk.gsub('-', '+').gsub('_', '/')
  psk = replaced_psk
  dec_psk = Base64.strict_decode64(psk)

  # cipher = OpenSSL::Cipher.new('AES-256-CTR')
  cipher = OpenSSL::Cipher.new('AES-128-CTR')
  filter_arr = filter.to_s.split(',').map(&:strip)
  mqtt_obj.get_packet do |packet_bytes|
    raw_packet = packet_bytes.to_s.b
    raw_packet_len = raw_packet.to_s.b.length
    raw_topic = packet_bytes.topic ||= ''
    raw_message = packet_bytes.payload

    begin
      disp = false
      message = {}

      if json
        message = JSON.parse(raw_message, symbolize_names: true)
      else
        svc_envl = Meshtastic::ServiceEnvelope.decode(raw_message)
        # map_report = Meshtastic::MapReport.decode(raw_message)
        message = svc_envl.to_h[:packet]
      end
      message[:topic] = raw_topic
      message[:node_id_from] = "!#{message[:from].to_i.to_s(16)}"
      message[:node_id_to] = "!#{message[:to].to_i.to_s(16)}"

      encrypted_message = message[:encrypted]
      # If encrypted_message is not nil, then decrypt the message
      if encrypted_message.to_s.length.positive?
        packet_id = message[:id]
        packet_from = message[:from]
        nonce_packet_id = [packet_id].pack('V').ljust(8, "\x00")
        nonce_from_node = [packet_from].pack('V').ljust(8, "\x00")
        nonce = "#{nonce_packet_id}#{nonce_from_node}".b

        # Decrypt the message
        # Key must be 32 bytes
        # IV mustr be 16 bytes
        cipher.decrypt
        cipher.key = dec_psk
        cipher.iv = nonce

        decrypted = cipher.update(encrypted_message) + cipher.final
        message[:decrypted] = decrypted
      end

      filter_arr = [message[:id].to_s] if filter.nil?
      flat_message = message.values.join(' ')

      disp = true if filter_arr.first == message[:id] ||
                     filter_arr.all? { |filter| flat_message.include?(filter) }

    rescue Google::Protobuf::ParseError
      next
    ensure
      if disp
        if block_given?
          yield message
        else
          puts "\n"
          puts '-' * 80
          puts "*** DEBUGGING ***"
          puts "MSG:\n#{message.inspect}"
          # puts "\nMap Report: #{map_report.inspect}"
          puts "\nRaw Packet: #{raw_packet.inspect}"
          puts "Length: #{raw_packet_len}"
          puts '-' * 80
          puts "\n\n\n"
        end
      else
        print '.'
      end
    end
  end
rescue Interrupt
  puts "\nCTRL+C detected. Exiting..."
rescue StandardError => e
  raise e
ensure
  mqtt_obj.disconnect if mqtt_obj
end