import com.github.s7connector.api.DaveArea;
import com.github.s7connector.api.S7Connector;
import com.github.s7connector.api.factory.S7ConnectorFactory;

public class PlcConnectTest {
    public static void main(String[] args) {
        String ip = "192.168.88.99";
        int[] slots = {2, 1, 0};
        for (int slot : slots) {
            System.out.println("==== try rack=0 slot=" + slot + " ====");
            S7Connector c = null;
            try {
                long t0 = System.currentTimeMillis();
                c = S7ConnectorFactory.buildTCPConnector()
                        .withHost(ip).withPort(102).withRack(0).withSlot(slot).withTimeout(8000).build();
                System.out.println("build ok in " + (System.currentTimeMillis() - t0) + "ms");
                byte[] data = c.read(DaveArea.DB, 9051, 38, 0);
                System.out.println("read DB9051 ok len=" + (data == null ? -1 : data.length));
                c.close();
                System.out.println("SUCCESS slot=" + slot);
                return;
            } catch (Throwable e) {
                Throwable cur = e;
                while (cur.getCause() != null && cur.getCause() != cur) {
                    cur = cur.getCause();
                }
                System.out.println("FAIL: " + e.getClass().getSimpleName() + "(" + e.getMessage()
                        + ") <- " + cur.getClass().getSimpleName() + ": " + cur.getMessage());
                try {
                    if (c != null) {
                        c.close();
                    }
                } catch (Exception ignored) {
                }
            }
        }
        System.out.println("==== try OLD default (no rack/slot) ====");
        try {
            S7Connector c = S7ConnectorFactory.buildTCPConnector().withHost(ip).withTimeout(8000).build();
            byte[] data = c.read(DaveArea.DB, 9051, 38, 0);
            System.out.println("OLD SUCCESS len=" + data.length);
            c.close();
        } catch (Throwable e) {
            Throwable cur = e;
            while (cur.getCause() != null && cur.getCause() != cur) {
                cur = cur.getCause();
            }
            System.out.println("OLD FAIL: " + e.getMessage() + " <- " + cur);
        }
    }
}