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 257

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)',
client_id: 'optional - client ID (default: random 4-byte hex string)'

)



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# File 'lib/meshtastic/mqtt.rb', line 26

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'
  client_id = opts[:client_id] ||= SecureRandom.random_bytes(4).unpack1('H*').to_s
  client_id = client_id.delete('!') if client_id.include?('!')

  MQTTClient.connect(
    host: host,
    port: port,
    username: username,
    password: password,
    client_id: client_id
  )
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 246

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

.help ⇒ Object

Display Usage for this Module



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# File 'lib/meshtastic/mqtt.rb', line 265

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)',
      client_id: 'optional - client ID (default: random 8-byte hex string)'
    )

    #{self}.subscribe(
      mqtt_obj: 'required - mqtt_obj object returned from #connect method',
      root_topic: 'optional - root topic (default: msh)',
      region: 'optional - region e.g. 'US/VA', etc (default: US)',
      channel: 'optional - channel name e.g. '2/stat/#' (default: '2/e/LongFast/#')',
      psks: 'optional - hash of :channel => psk key value pairs (default: { LongFast: '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)',
      gps_metadata: 'optional - include GPS metadata in output (default: false)'
    )

    #{self}.send_text(
      mqtt_obj: 'required - mqtt_obj returned from #connect method',
      from: ' required - From ID (String or Integer)',
      to: 'optional - Destination ID (Default: 0xFFFFFFFF)',
      topic: 'optional - topic to publish to (default: 'msh/US/2/e/LongFast/1')',
      channel: 'optional - channel ID (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==' })'
    )

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

    #{self}.authors
  "
end

.send_text(opts = {}) ⇒ Object

Supported Method Parameters

Meshtastic.send_text(

mqtt_obj: 'required - mqtt_obj returned from #connect method',
from: ' required - From ID (String or Integer)',
to: 'optional - Destination ID (Default: 0xFFFFFFFF)',
topic: 'optional - topic to publish to (default: "msh/US/2/e/LongFast/1")',
channel: 'optional - channel ID (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==" })'

)



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# File 'lib/meshtastic/mqtt.rb', line 229

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

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

  mqtt_obj.publish(topic, protobuf_text)
rescue StandardError => e
  raise e
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 e.g. 'US/VA', etc (default: US)',
channel: 'optional - channel name e.g. "2/stat/#" (default: "2/e/LongFast/#")',
psks: 'optional - hash of :channel => psk key value pairs (default: { LongFast: "AQ==" })',
qos: 'optional - quality of service (default: 0)',
filter: 'optional - comma-delimited string(s) to filter 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/mqtt.rb', line 59

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] ||= '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 => 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
  filter = opts[:filter]
  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}"
  full_topic = "#{root_topic}/#{region}" if region == '#'
  puts "Subscribing to: #{full_topic}"
  mqtt_obj.subscribe(full_topic, qos)

  filter_arr = filter.to_s.split(',').map(&:strip)
  mqtt_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::ServiceEnvelope.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 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]

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

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

        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
  mqtt_obj.disconnect if mqtt_obj
end