subscribe and interval nodes added

nodes/xilica-interval.js

@@ -0,0 +1,33 @@
+module.exports = function (RED) {
+  function XilicaInterval(config) {
+    RED.nodes.createNode(this, config);
+    const node = this;
+
+    node.interval = parseInt(config.interval, 10) || 100;
+
+    node.on("input", (msg, send, done) => {
+      send =
+        send ||
+        function () {
+          node.send.apply(node, arguments);
+        };
+      done = done || function () {};
+
+      let interval = node.interval;
+      if (Object.prototype.hasOwnProperty.call(msg, "interval")) {
+        const v = parseInt(msg.interval, 10);
+        if (!Number.isNaN(v) && v > 0) {
+          interval = v;
+        }
+      }
+
+      msg.payload = "INTERVAL " + interval;
+
+      send(msg);
+      done();
+    });
+  }
+
+  RED.nodes.registerType("xilica-interval", XilicaInterval);
+};
+