79 lines
2.2 KiB
Java
79 lines
2.2 KiB
Java
package netpp;
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import java.util.ArrayList;
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import org.eclipse.californium.core.CoapServer;
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public class Main {
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public final static String COOJA_MAGIC = "c30c";
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public final static String resource = "/PreciousResource";
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public static void main(String[] args) {
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if (args.length < 2) {
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System.err.println("[F] Bad parameters");
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System.err.println("Usage: ");
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System.err.println("$ exe <prefix> <n>");
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System.err.println(" prefix IPv6 /64 prefix (mind the format!)");
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System.err.println(" n last node number (dec)");
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System.err.println();
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System.err.println("Example:");
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System.err.println("$ exe 2001:db8:0:0 10");
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System.exit(1);
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}
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/* getting parameters from CLI */
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final String prefix = args[0];
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final int n = Integer.parseInt(args[1]);
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/* run server */
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CoapServer server = new CoapServer();
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server.start();
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System.err.println("[D] server started");
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/* subscribe to every node specified */
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System.err.println("[I] now subscribing to node [2; " + n + "] in " + prefix + "/64");
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ArrayList<Node> nodeList = new ArrayList<Node>();
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for (int i = 2; i <= n; i++) { // node 1 is the gateway, skip. And mind the <=
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String uri_string = "coap://[" + prefix + ":" + COOJA_MAGIC + "::" + Integer.toString(i, 16) + "]" + resource;
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System.err.println("[I] subscribing to " + uri_string);
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Node node = new Node(i, uri_string);
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nodeList.add(node);
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server.add(node.getResource());
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}
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/* periodically check for offline nodes */
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while (true) {
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System.err.println("[D] check for offline nodes...");
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Node offline_node = null;
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for (Node node : nodeList) {
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if (node.getStatus() == Status.OFFLINE) {
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System.err.println("[I] detected offline node");
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offline_node = node;
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break;
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}
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}
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if (offline_node != null) {
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System.err.println("[I] tryng again to contact " + offline_node.getURI());
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nodeList.remove(offline_node);
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server.remove(offline_node.getResource());
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Node new_node = new Node(0, offline_node.getURI().toString());
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nodeList.add(new_node);
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server.add(new_node.getResource());
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}
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/* thread sleep */
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try {
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Thread.sleep(5 * 1000); // 5 sec
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} catch (InterruptedException ex) {
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System.err.println(ex);
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}
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}
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}
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}
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