phase 2

tools/topic_watcher.cpp

@@ -0,0 +1,15 @@
+#include <softbus_bus/Bus.h>
+
+#include <iostream>
+#include <string>
+
+int main()
+{
+    auto& bus = softbus::bus::Bus::instance();
+    bus.subscribe("#", [](const softbus::bus::BusMessage& msg) {
+        std::cout << "[topic] " << msg.topic << std::endl;
+    });
+    std::cout << "topic_watcher: attach to daemon process is standalone demo only." << std::endl;
+    std::cout << "Use daemon logs or integrate watcher via shared bus in-process." << std::endl;
+    return 0;
+}