diff --git a/7seg.cpp b/7seg.cpp
new file mode 100644
index 0000000..57a18fd
--- /dev/null
+++ b/7seg.cpp
@@ -0,0 +1,73 @@
+/**
+ * Copyright 2017 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <cstdint>
+#include <cstdio>
+#include <experimental/filesystem>
+#include <lpcsnoop/snoop_listen.hpp>
+#include <string>
+
+static const char* device_node_path;
+
+namespace fs = std::experimental::filesystem;
+
+static void DisplayDbusValue(uint64_t postcode)
+{
+    // Uses cstdio instead of streams because the device file has
+    // very strict requirements about the data format and streaming
+    // abstractions tend to muck it up.
+    FILE* f = std::fopen(device_node_path, "r+");
+    if (f)
+    {
+        int rc = std::fprintf(f, "%d%02x\n", (postcode > 0xff),
+                              static_cast<uint8_t>(postcode & 0xff));
+        if (rc < 0)
+        {
+            std::fprintf(stderr, "failed to write 7seg value: rc=%d\n", rc);
+        }
+        std::fflush(f);
+        std::fclose(f);
+    }
+}
+
+/*
+ * This is the entry point for the application.
+ *
+ * This application simply creates an object that registers for incoming value
+ * updates for the POST code dbus object.
+ */
+int main(int argc, const char* argv[])
+{
+    if (argc != 2 || !fs::exists(argv[1]))
+    {
+        std::fprintf(stderr, "usage: %s <device_node>\n", argv[0]);
+        return -1;
+    }
+
+    device_node_path = argv[1];
+
+    auto ListenBus = sdbusplus::bus::new_default();
+    std::unique_ptr<lpcsnoop::SnoopListen> snoop =
+        std::make_unique<lpcsnoop::SnoopListen>(ListenBus, DisplayDbusValue);
+
+    while (true)
+    {
+        ListenBus.process_discard();
+        ListenBus.wait();
+    }
+
+    return 0;
+}