example: Add example to find Eddystone in C

CMakeLists.txt

@@ -1,7 +1,7 @@
 #
 #  GattLib - GATT Library
 #
-#  Copyright (C) 2016-2019  Olivier Martin <olivier@labapart.org>
+#  Copyright (C) 2016-2020  Olivier Martin <olivier@labapart.org>
 #
 #
 #  This program is free software; you can redistribute it and/or modify
@@ -104,6 +104,7 @@ if(GATTLIB_BUILD_EXAMPLES)
   # Examples
   add_subdirectory(examples/ble_scan)
   add_subdirectory(examples/discover)
+  add_subdirectory(examples/find_eddystone)
   add_subdirectory(examples/read_write)
   add_subdirectory(examples/read_write_memory)
   add_subdirectory(examples/notification)

examples/find_eddystone/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(find_eddystone_SRCS find_eddystone.c)
+
+add_executable(find_eddystone ${find_eddystone_SRCS})
+target_link_libraries(find_eddystone ${GATTLIB_LIBRARIES} ${GATTLIB_LDFLAGS} ${PCRE_LIBRARIES} pthread)

examples/find_eddystone/find_eddystone.c

@@ -0,0 +1,95 @@
+//#include <pthread.h>
+//#include <stdio.h>
+//#include <stdint.h>
+//#include <stdlib.h>
+//#include <sys/queue.h>
+
+#include "gattlib.h"
+
+#define BLE_SCAN_EDDYSTONE_TIMEOUT   20
+
+/**
+ * @brief Handler called on new discovered BLE device
+ *
+ * @param adapter is the adapter that has found the BLE device
+ * @param addr is the MAC address of the BLE device
+ * @param name is the name of BLE device if advertised
+ * @param advertisement_data is an array of Service UUID and their respective data
+ * @param advertisement_data_count is the number of elements in the advertisement_data array
+ * @param manufacturer_id is the ID of the Manufacturer ID
+ * @param manufacturer_data is the data following Manufacturer ID
+ * @param manufacturer_data_size is the size of manufacturer_data
+ * @param user_data  Data defined when calling `gattlib_register_on_disconnect()`
+ */
+void on_eddystone_found(void *adapter, const char* addr, const char* name,
+		gattlib_advertisement_data_t *advertisement_data, size_t advertisement_data_count,
+		uint16_t manufacturer_id, uint8_t *manufacturer_data, size_t manufacturer_data_size,
+		void *user_data)
+{
+	puts("Found Eddystone device");
+
+	// Look for Eddystone Common Data
+	for (size_t i = 0; i < advertisement_data_count; i++) {
+		gattlib_advertisement_data_t *advertisement_data_ptr = &advertisement_data[i];
+		if (gattlib_uuid_cmp(&advertisement_data_ptr->uuid, &gattlib_eddystone_common_data_uuid) == GATTLIB_SUCCESS) {
+			switch (advertisement_data_ptr->data[0]) {
+			case EDDYSTONE_TYPE_UID:
+				puts("\tEddystone UID");
+				break;
+			case EDDYSTONE_TYPE_URL:
+				printf("\tEddystone URL %s%s (TX Power:%d)\n",
+						gattlib_eddystone_url_scheme_prefix[advertisement_data_ptr->data[2]],
+						advertisement_data_ptr->data + 3,
+						advertisement_data_ptr->data[1]);
+				break;
+			case EDDYSTONE_TYPE_TLM:
+				puts("\tEddystone TLM");
+				break;
+			case EDDYSTONE_TYPE_EID:
+				puts("\tEddystone EID");
+				break;
+			default:
+				fprintf(stderr, "\tEddystone ID %d not supported\n", advertisement_data_ptr->data[0]);
+			}
+		}
+	}
+
+	// We stop advertising on the first device
+	gattlib_adapter_scan_disable(adapter);
+}
+
+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_eddystone(adapter,
+			0, /* rssi_threshold. The value is not relevant as we do not pass GATTLIB_EDDYSTONE_LIMIT_RSSI */
+			GATTLIB_EDDYSTONE_TYPE_URL,
+			on_eddystone_found, BLE_SCAN_EDDYSTONE_TIMEOUT, NULL);
+	if (ret) {
+		fprintf(stderr, "ERROR: Failed to scan.\n");
+		goto EXIT;
+	}
+
+	puts("Scan completed");
+
+EXIT:
+	gattlib_adapter_close(adapter);
+	return ret;
+}