examples: Introduce 'advertisement_data' to demonstrate how to retrieve advertisement data from devices around

CMakeLists.txt

@@ -102,6 +102,7 @@ set(ENV{PKG_CONFIG_PATH} "${PROJECT_BINARY_DIR}:$ENV{PKG_CONFIG_PATH}")
 
 if(GATTLIB_BUILD_EXAMPLES)
   # Examples
+  add_subdirectory(examples/advertisement_data)
   add_subdirectory(examples/ble_scan)
   add_subdirectory(examples/discover)
   add_subdirectory(examples/find_eddystone)

examples/advertisement_data/CMakeLists.txt

@@ -0,0 +1,31 @@
+#
+#  GattLib - GATT Library
+#
+#  Copyright (C) 2016-2020  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)
+
+set(advertisement_data_SRCS advertisement_data.c)
+
+add_executable(advertisement_data ${advertisement_data_SRCS})
+target_link_libraries(advertisement_data ${GATTLIB_LIBRARIES} ${GATTLIB_LDFLAGS})

examples/advertisement_data/advertisement_data.c

@@ -0,0 +1,75 @@
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+#include "gattlib.h"
+
+#define BLE_SCAN_TIMEOUT   60
+
+static void ble_advertising_device(void *adapter, const char* addr, const char* name, void *user_data) {
+	gattlib_advertisement_data_t *advertisement_data;
+	size_t advertisement_data_count;
+	uint16_t manufacturer_id;
+	uint8_t *manufacturer_data;
+	size_t manufacturer_data_size;
+	int ret;
+
+	ret = gattlib_get_advertisement_data_from_mac(adapter, addr,
+			&advertisement_data, &advertisement_data_count,
+			&manufacturer_id, &manufacturer_data, &manufacturer_data_size);
+	if (ret != 0) {
+		return;
+	}
+
+	if (name) {
+		printf("Device %s - '%s': ", addr, name);
+	} else {
+		printf("Device %s: ", addr);
+	}
+
+	for (size_t i = 0; i < manufacturer_data_size; i++) {
+		printf("%02x ", manufacturer_data[i]);
+	}
+	printf("\n");
+}
+
+int main(int argc, const char *argv[]) {
+	const char* adapter_name;
+	void* adapter;
+	int ret;
+
+	if (argc == 1) {
+		adapter_name = NULL;
+	} else if (argc == 2) {
+		adapter_name = argv[1];
+	} else {
+		fprintf(stderr, "%s [<bluetooth-adapter>]\n", argv[0]);
+		return 1;
+	}
+
+	ret = gattlib_adapter_open(adapter_name, &adapter);
+	if (ret) {
+		fprintf(stderr, "ERROR: Failed to open adapter.\n");
+		return 1;
+	}
+
+	ret = gattlib_adapter_scan_enable_with_filter(adapter,
+			NULL, /* Do not filter on any specific Service UUID */
+			0 /* RSSI Threshold */,
+			GATTLIB_DISCOVER_FILTER_NOTIFY_CHANGE, /* Notify change of advertising data/RSSI */
+			ble_advertising_device,
+			0, /* timeout=0 means infinite loop */
+			NULL /* user_data */);
+	if (ret) {
+		fprintf(stderr, "ERROR: Failed to scan.\n");
+		goto EXIT;
+	}
+
+	gattlib_adapter_scan_disable(adapter);
+
+	puts("Scan completed");
+
+EXIT:
+	gattlib_adapter_close(adapter);
+	return ret;
+}