diff --git a/app/ble/gadget_bridge.c b/app/ble/gadget_bridge.c
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index 0000000..9f50236
--- /dev/null
+++ b/app/ble/gadget_bridge.c
@@ -0,0 +1,11 @@
+/**
+ * @file gadget_bridge.c
+ * @author Anatole SCHRAMM-HENRY
+ * @brief Source file implementing the API used to communicate/interact with the GadgetBridge Android application
+ *        over BLE.
+ * @version 0.1
+ * @date 2023-04-05
+ * 
+ * @copyright Copyright (c) 2023
+ * 
+ */
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diff --git a/app/ble/gadget_bridge.h b/app/ble/gadget_bridge.h
new file mode 100644
index 0000000..74d37e5
--- /dev/null
+++ b/app/ble/gadget_bridge.h
@@ -0,0 +1,76 @@
+/**
+ * @file gadget_bridge.h
+ * @author Anatole SCHRAMM-HENRY
+ * @brief Header file exposing the API used to communicate/interact with the GadgetBridge Android application
+ *        over BLE.
+ * @version 0.1
+ * @date 2023-04-04
+ * 
+ * @copyright MIT
+ * 
+ */
+
+#ifndef GADGET_BRIDGE_H
+#define GADGET_BRIDGE_H
+
+#include "wm_type_def.h"
+
+typedef enum
+{
+    GADGET_BRIDGE_TOAST_TYPE_INFO = 0,
+    GADGET_BRIDGE_TOAST_TYPE_WARN,
+    GADGET_BRIDGE_TOAST_TYPE_ERROR,
+} GADGET_BRIDGE_TOAST_TYPE_e;
+
+typedef enum
+{
+    GADGET_BRIDGE_MUSIC_CONTROL_PLAY = 0,
+    GADGET_BRIDGE_MUSIC_CONTROL_PAUSE,
+    GADGET_BRIDGE_MUSIC_CONTROL_PLAYPAUSE,
+    GADGET_BRIDGE_MUSIC_CONTROL_NEXT,
+    GADGET_BRIDGE_MUSIC_CONTROL_PREVIOUS,
+    GADGET_BRIDGE_MUSIC_CONTROL_VOLUMEUP,
+    GADGET_BRIDGE_MUSIC_CONTROL_VOLUMEDOWN,
+    GADGET_BRIDGE_MUSIC_CONTROL_FORWARD,
+    GADGET_BRIDGE_MUSIC_CONTROL_REWIND,
+} GADGET_BRIDGE_MUSIC_CONTROL_e;
+
+typedef enum
+{
+    GADGET_BRIDGE_CALL_ACTION_ACCEPT = 0,
+    GADGET_BRIDGE_CALL_ACTION_END,
+    GADGET_BRIDGE_CALL_ACTION_INCOMING,
+    GADGET_BRIDGE_CALL_ACTION_OUTGOING,
+    GADGET_BRIDGE_CALL_ACTION_REJECT,
+    GADGET_BRIDGE_CALL_ACTION_START,
+    GADGET_BRIDGE_CALL_ACTION_IGNORE,
+} GADGET_BRIDGE_CALL_ACTION_e;
+
+typedef enum
+{
+    GADGET_BRIDGE_NOTIFICATION_ACTION_DISMISS = 0,
+    GADGET_BRIDGE_NOTIFICATION_ACTION_DISMISS_ALL,
+    GADGET_BRIDGE_NOTIFICATION_ACTION_OPEN,
+    GADGET_BRIDGE_NOTIFICATION_ACTION_MUTE,
+    GADGET_BRIDGE_NOTIFICATION_ACTION_REPLY,
+} GADGET_BRIDGE_NOTIFICATION_ACTION_e;
+
+bool gadget_bridge_send_toast(GADGET_BRIDGE_TOAST_TYPE_e toast_type, const char *message);
+
+bool gadget_bridge_send_firmware_version(const char *fw1, const char *fw2);
+
+bool gadget_bridge_send_battery_status(uint8_t battery_level_in_percent, float battery_level_in_mV, bool is_charging);
+
+bool gadget_bridge_send_find_phone(bool find_phone);
+
+bool gadget_bridge_send_music_control(GADGET_BRIDGE_MUSIC_CONTROL_e music_control);
+
+bool gadget_bridge_handle_call(GADGET_BRIDGE_CALL_ACTION_e call_action);
+
+bool gadget_bridge_handle_notification(GADGET_BRIDGE_NOTIFICATION_ACTION_e notification_action, uint64_t handle, const char *phone_number, const char *message);
+
+bool gadget_bridge_send_activity_data(uint16_t heart_rate_in_bpm, uint32_t step_count);
+
+bool gadget_bridge_send_http_request();
+
+#endif //GADGET_BRIDGE_H
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