diff --git a/attn/attn_common.cpp b/attn/attn_common.cpp
new file mode 100644
index 0000000..3e1f473
--- /dev/null
+++ b/attn/attn_common.cpp
@@ -0,0 +1,36 @@
+#include <libpdbg.h>
+
+#include <attn/attn_common.hpp>
+#include <sdbusplus/bus.hpp>
+
+#include <map>
+
+namespace attn
+{
+
+/** @brief Transition the host state */
+void transitionHost(const HostState i_hostState)
+{
+    thread_stop_all(); // in libpdbg
+
+    // We will be transitioning host by starting appropriate dbus target
+    std::string target = "obmc-host-quiesce@0.target"; // quiesce is default
+
+    // diagnostic mode state requested
+    if (HostState::Diagnostic == i_hostState)
+    {
+        target = "obmc-host-diagnostic-mode@0.target";
+    }
+
+    auto bus    = sdbusplus::bus::new_system();
+    auto method = bus.new_method_call(
+        "org.freedesktop.systemd1", "/org/freedesktop/systemd1",
+        "org.freedesktop.systemd1.Manager", "StartUnit");
+
+    method.append(target);    // target unit to start
+    method.append("replace"); // mode = replace conflicting queued jobs
+
+    bus.call_noreply(method); // start the service
+}
+
+} // namespace attn