/**
     * Perform health check on connections
     */
    private void performHealthCheck() {
        long now = System.currentTimeMillis();
        if (now - lastHealthCheck < healthCheckInterval) {
            return;
        }

        lastHealthCheck = now;
        totalHealthChecks.incrementAndGet();
        List<SmbTransportImpl> unhealthy = new ArrayList<>();

        for (SmbTransportImpl transport : connections) {

            return isHealthy;
        }

        public void setHealthy(boolean healthy) {
            this.isHealthy = healthy;
            this.lastHealthCheck = System.currentTimeMillis();
        }

        public long getLastHealthCheck() {
            return lastHealthCheck;
        }

        @Override
        public String toString() {