Method: MQTT::Client#publish

Defined in:
lib/mqtt/client.rb

#publish(topic, payload = '', retain = false, qos = 0) ⇒ Object

Publish a message on a particular topic to the MQTT server.

Raises:

  • (ArgumentError) 


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# File 'lib/mqtt/client.rb', line 317

def publish(topic, payload = '', retain = false, qos = 0)
  raise ArgumentError, 'Topic name cannot be nil' if topic.nil?
  raise ArgumentError, 'Topic name cannot be empty' if topic.empty?

  packet = MQTT::Packet::Publish.new(
    :id => next_packet_id,
    :qos => qos,
    :retain => retain,
    :topic => topic,
    :payload => payload
  )

  # Send the packet
  res = send_packet(packet)

  return if qos.zero?

  queue = Queue.new

  wait_for_puback packet.id, queue

  deadline = current_time + @ack_timeout

  loop do
    response = queue.pop
    case response
    when :read_timeout
      return -1 if current_time > deadline
    when :close
      return -1
    else
      @pubacks_semaphore.synchronize do
        @pubacks.delete packet.id
      end
      break
    end
  end

  res
end