diff --git a/android/gatt.c b/android/gatt.c
index ce85af4..34549dd 100644
--- a/android/gatt.c
+++ b/android/gatt.c
@@ -31,20 +31,71 @@
 #include <glib.h>
 
 #include "ipc.h"
+#include "ipc-common.h"
 #include "lib/bluetooth.h"
 #include "gatt.h"
 #include "src/log.h"
 #include "hal-msg.h"
 
+struct gatt_client {
+	int32_t id;
+	uint8_t uuid[16];
+};
+
 static struct ipc *hal_ipc = NULL;
 static bdaddr_t adapter_addr;
+static GSList *gatt_clients = NULL;
+
+static int find_client_by_uuid(gconstpointer data, gconstpointer user_data)
+{
+	const uint8_t *exp_uuid = user_data;
+	const struct gatt_client *client = data;
+
+	return memcmp(exp_uuid, client->uuid, sizeof(client->uuid));
+}
 
 static void handle_client_register(const void *buf, uint16_t len)
 {
+	const struct hal_cmd_gatt_client_register *cmd = buf;
+	struct hal_ev_gatt_client_register_client ev;
+	struct gatt_client *client;
+	static int32_t client_cnt = 1;
+	uint8_t status;
+
 	DBG("");
 
-	ipc_send_rsp(hal_ipc, HAL_SERVICE_ID_GATT, HAL_OP_GATT_CLIENT_REGISTER,
-							HAL_STATUS_FAILED);
+	if (!cmd->uuid) {
+		error("gatt: no uuid received");
+		status = HAL_STATUS_FAILED;
+		goto failed;
+	}
+
+	if (g_slist_find_custom(gatt_clients, &cmd->uuid,
+							find_client_by_uuid)) {
+		error("gatt: client uuid is already on list");
+		status = HAL_STATUS_FAILED;
+		goto failed;
+	}
+
+	client = g_new0(struct gatt_client, 1);
+	memcpy(client->uuid, cmd->uuid, sizeof(client->uuid));
+
+	client->id = client_cnt++;
+
+	gatt_clients = g_slist_prepend(gatt_clients, client);
+
+	status = HAL_STATUS_SUCCESS;
+
+	ev.status = status;
+	ev.client_if = client->id;
+	memcpy(ev.app_uuid, client->uuid, sizeof(client->uuid));
+
+	ipc_send_notif(hal_ipc, HAL_SERVICE_ID_GATT,
+			HAL_EV_GATT_CLIENT_REGISTER_CLIENT, sizeof(ev), &ev);
+
+failed:
+	ipc_send_rsp(hal_ipc, HAL_SERVICE_ID_GATT,
+					HAL_OP_GATT_CLIENT_REGISTER, status);
 }
 
 static void handle_client_unregister(const void *buf, uint16_t len)