apt-get install -y nodejs
cd /root
npm init -y
npm install express axios

curl -fsSL https://deb.nodesource.com/setup_22.x -o nodesource_setup.sh

sudo -E bash nodesource_setup.sh

sudo apt-get install -y nodejs

node -v

nano /root/psu_proxy.js
sudo chmod 644 /root/psu_proxy.js
sudo chown root:root /root/psu_proxy.js

const axios = require('axios');
const cors = require('cors');  // Import CORS package

const app = express();
const port = 3000;

// Enable CORS for all origins (you can also restrict this to specific origins if needed)
app.use(cors());  // This will allow all origins by default

app.get('/proxy', async (req, res) => {
    const host = req.query.host; // Get the host from query parameters
    try {
        const response = await axios.get(`http://192.168.88.240/cgi-bin/nut/upsstats.cgi?host=${host}`);
        res.send(response.data);
    } catch (error) {
        console.error("Error fetching UPS data:", error);
        res.status(500).send("Error fetching data");
    }
});

app.listen(port, () => {
    console.log(`Proxy server running at http://localhost:${port}`);
});

node proxy.js

sudo nano /etc/systemd/system/psu-proxy.service

[Unit]
Description=PSU Proxy Server for NUT
After=network.target

[Service]
ExecStart=/usr/bin/node /root/psu_proxy.js
Restart=always
User=root
Group=root
Environment=NODE_ENV=production
WorkingDirectory=/root

[Install]
WantedBy=multi-user.target

Reload system and enable services

sudo systemctl daemon-reload
sudo systemctl enable psu-proxy.service
sudo systemctl start psu-proxy.service

UPS_LIST=("EATON1150VA" "Trust1500VA" "APC1400VA")  # Replace with your UPS device names
LOG_FILE="/var/log/usb_monitor.log"

check_ups() {
    for ups in "${UPS_LIST[@]}"; do
        STATUS=$(upsc "$ups" 2>/dev/null | grep "ups.status" | awk '{print $2}')

        if [ -z "$STATUS" ]; then
            echo "$(date): UPS $ups has stale data. Restarting NUT driver..." >> $LOG_FILE
            sudo systemctl restart nut-driver
            return
        fi
    done
}

while true; do
    check_ups
    sleep 60  # Check every minute
done