examples: Demonstrate gattlib notification API

CMakeLists.txt

@@ -54,6 +54,7 @@ set(ENV{PKG_CONFIG_PATH} "${PROJECT_BINARY_DIR}:$ENV{PKG_CONFIG_PATH}")
 add_subdirectory(examples/ble_scan)
 add_subdirectory(examples/discover)
 add_subdirectory(examples/read_write)
+add_subdirectory(examples/notification)
 add_subdirectory(examples/nordic_uart)
 
 # Some examples require Bluez code and other DBus support

README.md

@@ -69,7 +69,11 @@ Examples
 
 * [Demonstrate BLE scanning and connection](/examples/ble_scan/ble_scan.c):
 
-        sudo ./examples/ble_scan/ble_scan
+        ./examples/ble_scan/ble_scan
+
+* [Demonstrate GATT notification using GATT Battery service](/examples/notification/notification.c):
+
+        ./examples/notification/notification
 
 **Note:** `examples/gatttool` has been partially ported to gattlib. There are two reasons: the laziness
  (some of the GATT functions could be replaced by their gattlib equivalent) and the completeness (there

examples/notification/CMakeLists.txt

@@ -0,0 +1,34 @@
+#
+#
+#  GattLib - GATT Library
+#
+#  Copyright (C) 2016-2017  Olivier Martin <olivier@labapart.org>
+#
+#
+#  This program is free software; you can redistribute it and/or modify
+#  it under the terms of the GNU General Public License as published by
+#  the Free Software Foundation; either version 2 of the License, or
+#  (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software
+#  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+#
+
+cmake_minimum_required(VERSION 2.6)
+
+find_package(PkgConfig REQUIRED)
+
+pkg_search_module(GATTLIB REQUIRED gattlib)
+pkg_search_module(GLIB REQUIRED glib-2.0)
+
+include_directories(${GLIB_INCLUDE_DIRS})
+set(notification_SRCS notification.c)
+
+add_executable(notification ${notification_SRCS})
+target_link_libraries(notification ${GATTLIB_LIBRARIES})

examples/notification/notification.c

@@ -0,0 +1,82 @@
+/*
+ *
+ *  GattLib - GATT Library
+ *
+ *  Copyright (C) 2016-2017  Olivier Martin <olivier@labapart.org>
+ *
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+
+#include <assert.h>
+#include <glib.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "gattlib.h"
+
+void notification_handler(const uuid_t* uuid, const uint8_t* data, size_t data_length, void* user_data) {
+	int i;
+
+	printf("Notification Handler: ");
+
+	for (i = 0; i < data_length; i++) {
+		printf("%02x ", data[i]);
+	}
+	printf("\n");
+}
+
+static void usage(char *argv[]) {
+	printf("%s <device_address>\n", argv[0]);
+}
+
+int main(int argc, char *argv[]) {
+	int ret;
+	gatt_connection_t* connection;
+
+	if (argc != 2) {
+		usage(argv);
+		return 1;
+	}
+
+	connection = gattlib_connect(NULL, argv[1], BDADDR_LE_PUBLIC, BT_SEC_LOW, 0, 0);
+	if (connection == NULL) {
+		fprintf(stderr, "Fail to connect to the bluetooth device.\n");
+		return 1;
+	}
+
+	gattlib_register_notification(connection, notification_handler, NULL);
+
+	// Battery Level UUID
+	uuid_t battery_level_uuid = {
+		.type= SDP_UUID16,
+		.value.uuid16= 0x2A19
+	};
+
+	ret = gattlib_notification_start(connection, &battery_level_uuid);
+	if (ret) {
+		fprintf(stderr, "Fail to start notification\n.");
+		return 1;
+	}
+
+	GMainLoop *loop = g_main_loop_new(NULL, 0);
+	g_main_loop_run(loop);
+
+	g_main_loop_unref(loop);
+	gattlib_disconnect(connection);
+	puts("Done");
+	return 0;
+}