code: function _broadcastMessage (type, data) {
      data = data || {}
      let message = {type, data}
      let { host, coordinationPort } = node.settings
      dns.resolve4(host, (err, addresses) => {
        if (err) {
          debug(`cannot resolve host '${host}'. Check DNS infrastructure.`)
          return
        }
        debug(`broadcasting message '${type}' to '${host}' nodes: ${addresses}`)
        addresses.forEach(address => {
          let messenger = zmq.socket('req')
          messenger.connect(`tcp://${address}:${coordinationPort}`)
          messenger.send(JSON.stringify({
            ...message,
            toAddress: address
          }))
  
          let _end = false
          function closeSocket () {
            if (_end) return
            _end = true
            messenger.close()
          }
  
          messenger.on('message', closeSocket)
          setTimeout(closeSocket, 300)
        })
      })
    }
docs: broadcasts a message to the coordination socket of all the dnsNodes
  @param  {string} type - Type of message
  @param  {object} data - Payload of the message