add mqtt listener

mqtt/utils/node_id_util.test.js

@@ -0,0 +1,9 @@
+const NodeIdUtil = require("./node_id_util");
+
+test('can convert hex id to numeric id', () => {
+    expect(NodeIdUtil.convertToNumeric("!FFFFFFFF")).toBe(BigInt(4294967295));
+});
+
+test('can convert numeric id to numeric id', () => {
+    expect(NodeIdUtil.convertToNumeric(4294967295)).toBe(BigInt(4294967295));
+});