*/
    public long getLastActivityTime() {
        return lastActivityTime;
    }

    /**
     * Update activity timestamp
     */
    public void updateActivity() {
        this.lastActivityTime = System.currentTimeMillis();
    }

    /**
     * Get idle time since last activity
     *
     * @return idle time in milliseconds
     */

        // Wait a bit and update activity
        try {
            Thread.sleep(10);
        } catch (InterruptedException e) {
            Thread.currentThread().interrupt();
        }

        channelInfo.updateActivity();
        assertTrue(channelInfo.getLastActivityTime() > initialTime);
        assertTrue(channelInfo.getIdleTime() >= 0);
    }

    @Test
    void testMetrics() {

        assertTrue(channel.isHealthy());

        // Test metrics
        channel.incrementRequestsSent();
        channel.addBytesSent(1024);
        channel.updateActivity();

        assertEquals(1, channel.getRequestsSent());
        assertEquals(1024, channel.getBytesSent());
        assertTrue(channel.getLastActivityTime() > 0);
    }

    @Test

        // Send echo request as keep-alive
        // This would need to be implemented with actual echo request/response
        log.debug("Sending keep-alive for channel {}", channel.getChannelId());
        channel.updateActivity();
    }

    private void discoverInterfaces() {
        if (!multiChannelEnabled)
            return;

        // Periodically rediscover interfaces in case of network changes

        this.requestsSent = new AtomicLong();
        this.requestsReceived = new AtomicLong();
        this.errors = new AtomicLong();
        
        this.isPrimary = false;
    }
    
    public void updateActivity() {
        this.lastActivityTime = System.currentTimeMillis();
    }
    
    public long getIdleTime() {
        return System.currentTimeMillis() - lastActivityTime;
    }