example: new gap_link_keys example

example/Makefile.inc

@@ -115,6 +115,7 @@ EXAMPLES = 					\
 	gap_dedicated_bonding	\
 	gap_inquiry 			\
 	gap_le_advertisements   \
+	gap_link_keys           \
 	gatt_battery_query		\
 	gatt_browser            \
 	hfp_ag_demo             \
@@ -239,6 +240,9 @@ gap_dedicated_bonding: ${CORE_OBJ} ${COMMON_OBJ} ${CLASSIC_OBJ} gap_dedicated_bo
 gap_inquiry: ${CORE_OBJ} ${COMMON_OBJ} ${CLASSIC_OBJ} gap_inquiry.c
 	${CC} $^ ${CFLAGS} ${LDFLAGS} -o $@
 
+gap_link_keys: ${CORE_OBJ} ${COMMON_OBJ} ${CLASSIC_OBJ} gap_link_keys.c
+	${CC} $^ ${CFLAGS} ${LDFLAGS} -o $@
+
 panu_demo: ${CORE_OBJ} ${COMMON_OBJ} ${CLASSIC_OBJ} ${SDP_CLIENT} panu_demo.c
 	${CC} $^ ${CFLAGS} ${LDFLAGS} -o $@
 

example/gap_link_keys.c

@@ -0,0 +1,126 @@
+/*
+ * Copyright (C) 2014 BlueKitchen GmbH
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the copyright holders nor the names of
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ * 4. Any redistribution, use, or modification is done solely for
+ *    personal benefit and not for any commercial purpose or for
+ *    monetary gain.
+ *
+ * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS
+ * RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+ * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * Please inquire about commercial licensing options at 
+ * contact@bluekitchen-gmbh.com
+ *
+ */
+
+#define __BTSTACK_FILE__ "gap_link_keys.c"
+
+// *****************************************************************************
+/* EXAMPLE_START(gap_link_keys): GAP Link Key Management Example
+ * @text Shows how to iterate over the Classic Link Keys stored in NVS
+ *       Link Keys are per device-device bonding. If the Bluetooth Controller can be swapped, 
+ *       e.g. on desktop systems, a Link Key DB for each Controller is needed.
+ *       We need to wait until the Bluetooth Stack has started up and selected 
+ *       the correct Link Key DB based on the Controller's BD_ADDR.
+ */
+// *****************************************************************************
+
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "btstack.h"
+
+static btstack_packet_callback_registration_t hci_event_callback_registration;
+
+/* @section GAP Link Key Logic 
+ *
+ * @text List stored link keys
+ */ 
+static void list_link_keys(void){
+    bd_addr_t  addr;
+    link_key_t link_key;
+    link_key_type_t type;
+    btstack_link_key_iterator_t it;
+
+    int ok = gap_link_key_iterator_init(&it);
+    if (!ok) {
+        printf("Link key iterator not implemented\n");
+        return;
+    }
+    printf("Stored link keys: \n");
+    while (gap_link_key_iterator_get_next(&it, addr, link_key, &type)){
+        printf("%s - type %u, key: ", bd_addr_to_str(addr), (int) type);
+        printf_hexdump(link_key, 16);
+    }
+    printf(".\n");
+    gap_link_key_iterator_done(&it);
+}
+
+/* @section Bluetooth Logic 
+ *
+ * @text Wait for Bluetooth startup before listing the stored link keys
+ */ 
+
+static void packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){
+    UNUSED(channel);
+    UNUSED(size);
+
+    if (packet_type != HCI_EVENT_PACKET) return;
+    switch(hci_event_packet_get_type(packet)){
+        case BTSTACK_EVENT_STATE:
+            if (btstack_event_state_get_state(packet) == HCI_STATE_WORKING){
+                list_link_keys();
+                break;
+            }
+            break;
+        default:
+            break;
+    }
+}
+
+/* @section Main Application Setup
+ *
+ * @text Listing MainConfiguration shows main application code.
+ * It registers the HCI packet handler and starts the Bluetooth stack.
+ */
+
+/* LISTING_START(MainConfiguration): Setup packet handler for GAP inquiry */
+int btstack_main(int argc, const char * argv[]);
+int btstack_main(int argc, const char * argv[]) {
+    (void)argc;
+    (void)argv;
+
+    hci_event_callback_registration.callback = &packet_handler;
+    hci_add_event_handler(&hci_event_callback_registration);
+
+    // turn on!
+    hci_power_control(HCI_POWER_ON);
+        
+    return 0;
+}
+/* LISTING_END */
+/* EXAMPLE_END */