code: function _onInboxMessage (sender, _, msgBuffer) {
      let message = JSON.parse(msgBuffer)
      masterBroker.setIP(message.toAddress)
  
      switch (message.type) {
        case 'voteRequest':
          debug(`sending vote to ${node.name === message.from ? 'myself' : message.from}`)
          _inbox.send([sender, _, JSON.stringify({
            id: _advertiseId || node.id,
            name: node.name,
            endpoints: masterBroker.endpoints,
            isMaster: masterBroker.isMaster,
            candidate: !_advertiseId
          })])
          break
        case 'masterRequest':
          let connectedMaster = node.master
          if (connectedMaster) {
            debug(`sending master coordinates to ${message.from}`)
            _inbox.send([sender, _, JSON.stringify(connectedMaster)])
          } else {
            debug(`unable to send master coordinates to ${message.from}`)
            _inbox.send([sender, _, JSON.stringify(false)])
          }
          break
        case 'masterElected':
          _inbox.send([sender, _, ''])
          debug(`received notice of master election: ${message.data.name}`)
          resolver.emit('newmaster', message.data)
      }
    }
docs: function receiving the messages from the coordination router
  @param  {buffer} sender
  @param  {void} _
  @param  {buffer} msgBuffer