Class: MQTT::Homie::Device

Inherits:
Base
  • Object
show all
Defined in:
lib/mqtt/homie/device.rb

Constant Summary collapse

VERSION =

the Homie spec version

"4.0.0"

Constants inherited from Base

Base::REGEX

Instance Attribute Summary collapse

Attributes inherited from Base

#id, #name

Instance Method Summary collapse

Constructor Details

#initialize(id, name, root_topic: nil, mqtt: nil, clear_topics: true, metadata: true, &block) ⇒ Device

Returns a new instance of Device.



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# File 'lib/mqtt/homie/device.rb', line 15

def initialize(id, name, root_topic: nil, mqtt: nil, clear_topics: true, metadata: true, &block)
  super(id, name)
  @root_topic = root_topic || "homie"
  @state = :init
  @nodes = {}
  @published = false
  @out_of_band_topic_proc = block
  @metadata = metadata
  # retry forever
  mqtt = MQTT::Client.new(mqtt, reconnect_limit: nil) if mqtt.is_a?(String)
  mqtt = MQTT::Client.new(reconnect_limit: nil, **mqtt) if mqtt.is_a?(Hash)
  @mqtt = mqtt || MQTT::Client.new(reconnect_limit: nil)
  @mqtt.set_will("#{topic}/$state", "lost", retain: true, qos: 1)

  @mqtt.on_reconnect do
    each do |node|
      node.each(&:subscribe)
    end
    mqtt.publish("#{topic}/$state", :init, retain: true, qos: 1)
    mqtt.publish("#{topic}/$state", state, retain: true, qos: 1) unless state == :init
  end

  @mqtt.connect
  self.clear_topics if clear_topics
end

Instance Attribute Details

#logger ⇒ Object

Returns the value of attribute logger.



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# File 'lib/mqtt/homie/device.rb', line 13

def logger
  @logger
end

#mqtt ⇒ Object (readonly)

Returns the value of attribute mqtt.



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# File 'lib/mqtt/homie/device.rb', line 12

def mqtt
  @mqtt
end

#out_of_band_topic_proc ⇒ Object

Returns the value of attribute out_of_band_topic_proc.



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# File 'lib/mqtt/homie/device.rb', line 13

def out_of_band_topic_proc
  @out_of_band_topic_proc
end

#root_topic ⇒ Object (readonly)

Returns the value of attribute root_topic.



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# File 'lib/mqtt/homie/device.rb', line 12

def root_topic
  @root_topic
end

#state ⇒ Object

Returns the value of attribute state.



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# File 'lib/mqtt/homie/device.rb', line 12

def state
  @state
end

Instance Method Details

#[](id) ⇒ Object 



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# File 'lib/mqtt/homie/device.rb', line 80

def [](id)
  @nodes[id]
end

#clear_topics ⇒ Object

rubocop:disable Naming/PredicateMethod

Raises:



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# File 'lib/mqtt/homie/device.rb', line 179

def clear_topics # rubocop:disable Naming/PredicateMethod
  raise ArgumentError, "cannot clear topics once published" if published?

  @mqtt.subscribe("#{topic}/#")
  @mqtt.unsubscribe("#{topic}/#", wait_for_ack: true)
  until @mqtt.queue_empty?
    packet = @mqtt.get
    @mqtt.publish(packet.topic, retain: true, qos: 0)
  end
  true
end

#count ⇒ Object 



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# File 'lib/mqtt/homie/device.rb', line 88

def count
  @nodes.count
end

#device ⇒ Object 



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# File 'lib/mqtt/homie/device.rb', line 45

def device
  self
end

#disconnect ⇒ Object 



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# File 'lib/mqtt/homie/device.rb', line 153

def disconnect
  @published = false
  mqtt.disconnect
  @subscription_thread&.kill
end

#each(&block) ⇒ Object 



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# File 'lib/mqtt/homie/device.rb', line 84

def each(&block)
  @nodes.each_value(&block)
end

#empty? ⇒ Boolean

Returns:



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# File 'lib/mqtt/homie/device.rb', line 92

def empty?
  @nodes.empty?
end

#init ⇒ Object 



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# File 'lib/mqtt/homie/device.rb', line 166

def init
  return yield state if state == :init

  prior_state = state
  self.state = :init
  result = nil
  mqtt.batch_publish do
    result = yield prior_state
  end
  self.state = :ready
  result
end

#inspect ⇒ Object 



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# File 'lib/mqtt/homie/device.rb', line 41

def inspect
  "#<MQTT::Homie::Device #{topic} name=#{name.inspect}, $state=#{state.inspect}>"
end

#join ⇒ Object 



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# File 'lib/mqtt/homie/device.rb', line 159

def join
  @subscription_thread&.join
rescue => e
  e.set_backtrace(e.backtrace + ["<from Homie MQTT thread>"] + caller)
  raise e
end

#metadata? ⇒ Boolean

Returns:



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# File 'lib/mqtt/homie/device.rb', line 100

def metadata?
  @metadata
end

#publish ⇒ Object 



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# File 'lib/mqtt/homie/device.rb', line 104

def publish
  return if published?

  mqtt.batch_publish do
    if metadata?
      mqtt.publish("#{topic}/$homie", VERSION, retain: true, qos: 1)
      mqtt.publish("#{topic}/$name", name, retain: true, qos: 1)
    end
    mqtt.publish("#{topic}/$state", @state.to_s, retain: true, qos: 1)

    @subscription_thread = Thread.new do
      # you'll get the exception when you call `join`
      Thread.current.report_on_exception = false

      mqtt.get do |packet|
        logger&.debug("received packet at #{packet.topic} with payload #{packet.payload.inspect}")
        match = packet.topic.match(topic_regex)
        node = @nodes[match[:node]] if match
        property = node[match[:property]] if node

        unless property&.settable?
          begin
            @out_of_band_topic_proc&.call(packet.topic, packet.payload)
          rescue => e
            logger&.warn("Error in out of band topic proc for topic #{packet.topic} " \
                         "with payload #{packet.payload.inspect}: #{e.message}")
          end
          next
        end

        property.set(packet.payload)
      end
    end

    mqtt.publish("#{topic}/$nodes", @nodes.keys.join(","), retain: true, qos: 1) if metadata?
    @nodes.each_value(&:publish)

    yield if block_given?

    self.state = :ready
  end

  @published = true
end

#published? ⇒ Boolean

Returns:



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# File 'lib/mqtt/homie/device.rb', line 96

def published?
  @published
end

#remove_node(id) ⇒ Object

rubocop:disable Naming/PredicateMethod



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# File 'lib/mqtt/homie/device.rb', line 69

def remove_node(id) # rubocop:disable Naming/PredicateMethod
  return false unless (node = @nodes[id])

  init do
    node.unpublish
    @nodes.delete(id)
    mqtt.publish("#{topic}/$nodes", @nodes.keys.join(","), retain: true, qos: 1) if published?
  end
  true
end

#topic ⇒ Object 



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# File 'lib/mqtt/homie/device.rb', line 49

def topic
  "#{root_topic}/#{id}"
end