code: function writeResponse (streamHandler, status, cb) {
      cb = cb || (() => {})
      streamHandler.write(proto.CircuitRelay.encode({
        type: proto.CircuitRelay.Type.STATUS,
        code: status
      }))
      return cb()
    }
docs: Write a response
  
  @param {StreamHandler} streamHandler
  @param {CircuitRelay.Status} status
  @param {Function} cb
  @returns {*}