Module: Meshtastic::Serial

Defined in:
lib/meshtastic/serial.rb

Class Method Summary collapse

Class Method Details

.authors ⇒ Object

Author(s)

0day Inc. <[email protected]>



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# File 'lib/meshtastic/serial.rb', line 295

public_class_method def self.authors
  "AUTHOR(S):
    0day Inc. <[email protected]>
  "
end

.connect(opts = {}) ⇒ Object

Supported Method Parameters

serial_obj = Meshtastic::Serial.connect(

block_dev: 'optional - serial block device path (defaults to /dev/ttyUSB0)',
baud: 'optional - (defaults to 9600)',
data_bits: 'optional - (defaults to 8)',
stop_bits: 'optional - (defaults to 1)',
parity: 'optional - :even|:mark|:odd|:space|:none (defaults to :none)'

)



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# File 'lib/meshtastic/serial.rb', line 25

public_class_method def self.connect(opts = {})
  block_dev = opts[:block_dev] ||= '/dev/ttyUSB0'
  raise "Invalid block device: #{block_dev}" unless File.exist?(block_dev)

  baud = opts[:baud] ||= 9_600
  data_bits = opts[:data_bits] ||= 8
  stop_bits = opts[:stop_bits] ||= 1
  parity = opts[:parity] ||= :none

  case parity.to_s.to_sym
  when :even
    parity = 'E'
  when :odd
    parity = 'O'
  when :none
    parity = 'N'
  end
  raise "Invalid parity: #{opts[:parity]}" if parity.nil?

  mode = "#{data_bits}#{parity}#{stop_bits}"
  puts mode

  serial_conn = UART.open(
    block_dev,
    baud,
    mode
  )

  serial_obj = {}
  serial_obj[:serial_conn] = serial_conn
  serial_obj[:session_thread] = init_session_thread(
    serial_conn: serial_conn
  )

  serial_obj
rescue StandardError => e
  disconnect(serial_obj: serial_obj) unless serial_obj.nil?
  raise e
end

.disconnect(opts = {}) ⇒ Object

Supported Method Parameters

serial_obj = Meshtastic.disconnect(

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

)



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# File 'lib/meshtastic/serial.rb', line 284

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

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

.help ⇒ Object

Display Usage for this Module



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# File 'lib/meshtastic/serial.rb', line 303

public_class_method def self.help
  puts "USAGE:
    serial_obj = #{self}.connect(
      host: 'optional - mqtt host (default: mqtt.meshtastic.org)',
      port: 'optional - mqtt port (defaults: 1883)',
      tls: 'optional - use TLS (default: false)',
      username: 'optional - mqtt username (default: meshdev)',
      password: 'optional - (default: large4cats)',
      client_id: 'optional - client ID (default: random 4-byte hex string)',
      keep_alive: 'optional - keep alive interval (default: 15)',
      ack_timeout: 'optional - acknowledgement timeout (default: 30)'
    )

    #{self}.subscribe(
      serial_obj: 'required - serial_obj object returned from #connect method',
      root_topic: 'optional - root topic (default: msh)',
      region: 'optional - region e.g. 'US/VA', etc (default: US)',
      channel_topic: 'optional - channel ID path e.g. '2/stat/#' (default: '2/e/LongFast/#')',
      psks: 'optional - hash of :channel_id => psk key value pairs (default: { LongFast: 'AQ==' })',
      qos: 'optional - quality of service (default: 0)',
      json: 'optional - JSON output (default: false)',
      exclude: 'optional - comma-delimited string(s) to exclude in message (default: nil)',
      include: 'optional - comma-delimited string(s) to include on in message (default: nil)',
      gps_metadata: 'optional - include GPS metadata in output (default: false)'
    )

    #{self}.send_text(
      serial_obj: 'required - serial_obj returned from #connect method',
      from: 'required - From ID (String or Integer) (Default: \"!00000b0b\")',
      to: 'optional - Destination ID (Default: \"!ffffffff\")',
      topic: 'optional - topic to publish to (default: 'msh/US/2/e/LongFast/1')',
      channel: 'optional - channel (Default: 6)',
      text: 'optional - Text Message (Default: SYN)',
      want_ack: 'optional - Want Acknowledgement (Default: false)',
      want_response: 'optional - Want Response (Default: false)',
      hop_limit: 'optional - Hop Limit (Default: 3)',
      on_response: 'optional - Callback on Response',
      psks: 'optional - hash of :channel => psk key value pairs (default: { LongFast: 'AQ==' })'
    )

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

    #{self}.authors
  "
end

.send_text(opts = {}) ⇒ Object

Supported Method Parameters

Meshtastic.send_text(

serial_obj: 'required - serial_obj returned from #connect method',
from: 'required - From ID (String or Integer) (Default: "!00000b0b")',
to: 'optional - Destination ID (Default: "!ffffffff")',
topic: 'optional - topic to publish to (Default: "msh/US/2/e/LongFast/1")',
channel: 'optional - channel (Default: 6)',
text: 'optional - Text Message (Default: SYN)',
want_ack: 'optional - Want Acknowledgement (Default: false)',
want_response: 'optional - Want Response (Default: false)',
hop_limit: 'optional - Hop Limit (Default: 3)',
on_response: 'optional - Callback on Response',
psks: 'optional - hash of :channel_id => psk key value pairs (default: { LongFast: "AQ==" })'

)



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# File 'lib/meshtastic/serial.rb', line 267

public_class_method def self.send_text(opts = {})
  serial_obj = opts[:serial_obj]
  topic = opts[:topic] ||= 'msh/US/2/e/LongFast/#'
  opts[:via] = :radio

  # TODO: Implement chunked message to deal with large messages
  protobuf_text = Meshtastic.send_text(opts)

  serial_obj.publish(topic, protobuf_text)
rescue StandardError => e
  raise e
end

.subscribe(opts = {}) ⇒ Object

Supported Method Parameters

Meshtastic::Serial.subscribe(

serial_obj: 'required - serial_obj returned from #connect method'
root_topic: 'optional - root topic (default: msh)',
region: 'optional - region e.g. 'US/VA', etc (default: US)',
channel_topic: 'optional - channel ID path e.g. "2/stat/#" (default: "2/e/LongFast/#")',
psks: 'optional - hash of :channel_id => psk key value pairs (default: { LongFast: "AQ==" })',
qos: 'optional - quality of service (default: 0)',
exclude: 'optional - comma-delimited string(s) to exclude in message (default: nil)',
include: 'optional - comma-delimited string(s) to include on in message (default: nil)',
gps_metadata: 'optional - include GPS metadata in output (default: false)',
include_raw: 'optional - include raw packet data in output (default: false)'

)



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# File 'lib/meshtastic/serial.rb', line 79

public_class_method def self.subscribe(opts = {})
  serial_obj = opts[:serial_obj]
  root_topic = opts[:root_topic] ||= 'msh'
  region = opts[:region] ||= 'US'
  channel_topic = opts[:channel_topic] ||= '2/e/LongFast/#'
  # TODO: Support Array of PSKs and attempt each until decrypted

  public_psk = '1PG7OiApB1nwvP+rz05pAQ=='
  psks = opts[:psks] ||= { LongFast: public_psk }
  raise 'ERROR: psks parameter must be a hash of :channel_id => psk key value pairs' unless psks.is_a?(Hash)

  psks[:LongFast] = public_psk if psks[:LongFast] == 'AQ=='
  psks = Meshtastic.get_cipher_keys(psks: psks)

  qos = opts[:qos] ||= 0
  json = opts[:json] ||= false
  exclude = opts[:exclude]
  include = opts[:include]
  gps_metadata = opts[:gps_metadata] ||= false
  include_raw = opts[:include_raw] ||= false

  # NOTE: Use MQTT Explorer for topic discovery
  full_topic = "#{root_topic}/#{region}/#{channel_topic}"
  full_topic = "#{root_topic}/#{region}" if region == '#'
  puts "Subscribing to: #{full_topic}"
  serial_obj.subscribe(full_topic, qos)

  # MQTT::ProtocolException: No Ping Response received for 23 seconds (MQTT::ProtocolException)

  include_arr = include.to_s.split(',').map(&:strip)
  exclude_arr = exclude.to_s.split(',').map(&:strip)
  serial_obj.get_packet do |packet_bytes|
    raw_packet = packet_bytes.to_s if include_raw
    raw_topic = packet_bytes.topic ||= ''
    raw_payload = packet_bytes.payload ||= ''

    begin
      disp = false
      decoded_payload_hash = {}
      message = {}
      stdout_message = ''

      if json
        decoded_payload_hash = JSON.parse(raw_payload, symbolize_names: true)
      else
        # decoded_payload = Meshtastic::ToRadio.decode(raw_payload)
        decoded_payload = Meshtastic::FromRadio.decode(raw_payload)
        decoded_payload_hash = decoded_payload.to_h
      end

      next unless decoded_payload_hash[:packet].is_a?(Hash)

      message = decoded_payload_hash[:packet] if decoded_payload_hash.keys.include?(:packet)
      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)}"
      if message.keys.include?(:rx_time)
        rx_time_int = message[:rx_time]
        if rx_time_int.is_a?(Integer)
          rx_time_utc = Time.at(rx_time_int).utc.to_s
          message[:rx_time_utc] = rx_time_utc
        end
      end

      if message.keys.include?(:public_key)
        raw_public_key = message[:public_key]
        message[:public_key] = Base64.strict_encode64(raw_public_key)
      end

      # If encrypted_message is not nil, then decrypt
      # the message prior to decoding.
      encrypted_message = message[:encrypted]
      if encrypted_message.to_s.length.positive? &&
         message[:topic]

        # if message[:pki_encrypted]
        #   # TODO: Display Decrypted PKI Message
        #   public_key = message[:public_key]
        #   dec_public_key = Base64.strict_decode64(public_key)
        # else
        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}"

        psk = psks[:LongFast]
        target_channel = message[:topic].split('/')[-2].to_sym
        psk = psks[target_channel] if psks.keys.include?(target_channel)
        dec_psk = Base64.strict_decode64(psk)

        cipher = OpenSSL::Cipher.new('AES-128-CTR')
        cipher = OpenSSL::Cipher.new('AES-256-CTR') if dec_psk.length == 32
        cipher.decrypt
        cipher.key = dec_psk
        cipher.iv = nonce

        decrypted = cipher.update(encrypted_message) + cipher.final
        # end
        message[:decoded] = Meshtastic::Data.decode(decrypted).to_h
        message[:encrypted] = :decrypted
      end

      if message[:decoded]
        # payload = Meshtastic::Data.decode(message[:decoded][:payload]).to_h
        payload = message[:decoded][:payload]
        msg_type = message[:decoded][:portnum]
        message[:decoded][:payload] = Meshtastic.decode_payload(
          payload: payload,
          msg_type: msg_type,
          gps_metadata: gps_metadata
        )
      end

      message[:raw_packet] = raw_packet if include_raw
      decoded_payload_hash[:packet] = message
      unless block_given?
        message[:stdout] = 'pretty'
        stdout_message = JSON.pretty_generate(decoded_payload_hash)
      end
    rescue Encoding::CompatibilityError,
           Google::Protobuf::ParseError,
           JSON::GeneratorError,
           ArgumentError => e

      unless e.is_a?(Encoding::CompatibilityError)
        message[:decrypted] = e.message if e.message.include?('key must be')
        message[:decrypted] = 'unable to decrypt - psk?' if e.message.include?('occurred during parsing')
        decoded_payload_hash[:packet] = message
        unless block_given?
          puts "WARNING: #{e.inspect} - MSG IS >>>"
          # puts e.backtrace
          message[:stdout] = 'inspect'
          stdout_message = decoded_payload_hash.inspect
        end
      end

      next
    ensure
      include_arr = [message[:id].to_s] if include_arr.empty?
      if message.is_a?(Hash)
        flat_message = message.values.join(' ')

        disp = true if exclude_arr.none? { |exclude| flat_message.include?(exclude) } && (
                         include_arr.first == message[:id] ||
                         include_arr.all? { |include| flat_message.include?(include) }
                       )

        if disp
          if block_given?
            yield decoded_payload_hash
          else
            puts "\n"
            puts '-' * 80
            puts 'MSG:'
            puts stdout_message
            puts '-' * 80
            puts "\n\n\n"
          end
          # else
          # print '.'
        end
      end
    end
  end
rescue Interrupt
  puts "\nCTRL+C detected. Exiting..."
rescue StandardError => e
  raise e
ensure
  serial_obj.disconnect if serial_obj
end