diff --git a/attn/attn_main.cpp b/attn/attn_main.cpp
index dda1fc8..e4766f0 100644
--- a/attn/attn_main.cpp
+++ b/attn/attn_main.cpp
@@ -1,6 +1,7 @@
 #include <libpdbg.h>
 
 #include <attn_handler.hpp>
+#include <attn_monitor.hpp>
 
 /**
  * @brief Attention handler application main()
@@ -14,8 +15,34 @@
 {
     int rc = 0; // return code
 
+    gpiod_line* line; // gpio line to monitor
+
+    boost::asio::io_service io; // async io monitoring service
+
     // initialize pdbg targets
     pdbg_targets_init(nullptr);
 
+    // GPIO line configuration (falling edge, active low)
+    struct gpiod_line_request_config config
+    {
+        "attention", GPIOD_LINE_REQUEST_EVENT_FALLING_EDGE, 0
+    };
+
+    // get handle to attention GPIO line
+    line = gpiod_line_get("gpiochip0", 74);
+
+    if (nullptr == line)
+    {
+        rc = 1; // error
+    }
+    else
+    {
+        // Creating a vector of one gpio to monitor
+        std::vector<std::unique_ptr<attn::AttnMonitor>> gpios;
+        gpios.push_back(std::make_unique<attn::AttnMonitor>(line, config, io));
+
+        io.run(); // start GPIO monitor
+    }
+
     return rc;
 }