diff --git a/src/daemon.c b/src/daemon.c
index 1ab02577c..60accc89f 100644
--- a/src/daemon.c
+++ b/src/daemon.c
@@ -91,6 +91,7 @@ static void daemon_no_connections_timeout(){
 #ifdef USE_LAUNCHD
     printf("No connection for %u seconds -> POWER OFF and quit\n", DAEMON_NO_CONNECTION_TIMEOUT);
     hci_power_control( HCI_POWER_OFF);
+    hci_close();
     exit(0);
 #else
     printf("No connection for %u seconds -> POWER OFF\n", DAEMON_NO_CONNECTION_TIMEOUT);
@@ -283,6 +284,7 @@ static void daemon_packet_handler(void * connection, uint8_t packet_type, uint16
 static void daemon_sigint_handler(int param){
     printf(" <= SIGINT received, shutting down..\n");    
     hci_power_control( HCI_POWER_OFF);
+    hci_close();
     printf("Good bye, see you.\n");    
     exit(0);
 }
@@ -336,7 +338,8 @@ int main (int argc,  char * const * argv){
     }
     
     bt_control_t * control = NULL;
-
+    remote_device_db_t * remote_device_db = NULL;
+    
 #ifdef HAVE_TRANSPORT_H4
     transport = hci_transport_h4_instance();
     config.device_name = UART_DEVICE;
@@ -357,6 +360,10 @@ int main (int argc,  char * const * argv){
     bluetooth_status_handler = platform_iphone_status_handler;
 #endif
     
+#ifdef REMOTE_DEVICE_DB
+    remote_device_db = &REMOTE_DEVICE_DB;
+#endif
+    
     run_loop_init(RUN_LOOP_POSIX);
     
     // @TODO: allow configuration per HCI CMD
@@ -366,7 +373,7 @@ int main (int argc,  char * const * argv){
     // hci_dump_open(NULL, HCI_DUMP_STDOUT);
                   
     // init HCI
-    hci_init(transport, &config, control);
+    hci_init(transport, &config, control, remote_device_db);
     
     // init L2CAP
     l2cap_init();
@@ -375,7 +382,7 @@ int main (int argc,  char * const * argv){
 
     // init SDP
     sdp_init();
-    
+        
 #ifdef USE_LAUNCHD
     socket_connection_create_launchd();
 #else
diff --git a/src/hci.c b/src/hci.c
index 3bc71b2e2..c8f025c29 100644
--- a/src/hci.c
+++ b/src/hci.c
@@ -481,7 +481,7 @@ void hci_register_packet_handler(void (*handler)(uint8_t packet_type, uint8_t *p
     hci_stack.packet_handler = handler;
 }
 
-void hci_init(hci_transport_t *transport, void *config, bt_control_t *control){
+void hci_init(hci_transport_t *transport, void *config, bt_control_t *control, remote_device_db_t * remote_device_db){
     
     // reference to use transport layer implementation
     hci_stack.hci_transport = transport;
@@ -501,13 +501,23 @@ void hci_init(hci_transport_t *transport, void *config, bt_control_t *control){
     // higher level handler
     hci_stack.packet_handler = dummy_handler;
 
-    // no link key db yet
-    hci_stack.remote_device_db = NULL;
+    // store and open remote device db
+    hci_stack.remote_device_db = remote_device_db;
+    if (hci_stack.remote_device_db) {
+        hci_stack.remote_device_db->open();
+    }
     
     // register packet handlers with transport
     transport->register_packet_handler(&packet_handler);
 }
 
+void hci_close(){
+    // close remote device db
+    if (hci_stack.remote_device_db) {
+        hci_stack.remote_device_db->close();
+    }
+}
+
 int hci_power_control(HCI_POWER_MODE power_mode){
     if (power_mode == HCI_POWER_ON && hci_stack.state == HCI_STATE_OFF) {
         
diff --git a/src/hci.h b/src/hci.h
index 87d829b52..15b3db426 100644
--- a/src/hci.h
+++ b/src/hci.h
@@ -223,9 +223,10 @@ uint16_t hci_create_cmd(uint8_t *hci_cmd_buffer, hci_cmd_t *cmd, ...);
 uint16_t hci_create_cmd_internal(uint8_t *hci_cmd_buffer, const hci_cmd_t *cmd, va_list argptr);
 
 // set up HCI
-void hci_init(hci_transport_t *transport, void *config, bt_control_t *control);
+void hci_init(hci_transport_t *transport, void *config, bt_control_t *control, remote_device_db_t * remote_device_db);
 void hci_register_packet_handler(void (*handler)(uint8_t packet_type, uint8_t *packet, uint16_t size));
-    
+void hci_close();
+
 // power control
 int hci_power_control(HCI_POWER_MODE mode);
 
diff --git a/src/remote_device_db.h b/src/remote_device_db.h
index 0fa7a947d..b2b775a6d 100644
--- a/src/remote_device_db.h
+++ b/src/remote_device_db.h
@@ -36,6 +36,11 @@
 #include <btstack/utils.h>
 
 typedef struct {
+
+    // management
+    void (*open)();
+    void (*close)();
+    
     // link key
     int  (*get_link_key)(bd_addr_t *bd_addr, link_key_t *link_key);
     void (*put_link_key)(bd_addr_t *bd_addr, link_key_t *key);
diff --git a/src/remote_device_db_iphone.m b/src/remote_device_db_iphone.m
index 7ce88e371..c1b7075fa 100644
--- a/src/remote_device_db_iphone.m
+++ b/src/remote_device_db_iphone.m
@@ -29,13 +29,81 @@
  *
  */
 #include "remote_device_db.h"
+#import <Foundation/Foundation.h>
 
+#define BTdaemonID         @"ch.ringwald.btdaemon"
+#define PREFS_REMOTE_NAME  @"RemoteName"
+#define PREFS_LINK_KEY     @"LinkKey"
+
+static NSMutableDictionary *remote_devices = nil;
+
+// Device info
+static void db_open(){
+	NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
+	NSDictionary * dict = [defaults persistentDomainForName:BTdaemonID];
+	remote_devices = [NSMutableDictionary dictionaryWithCapacity:([dict count]+5)];
+	
+	// copy entries
+	for (id key in dict) {
+		NSDictionary *value = [dict objectForKey:key];
+		NSMutableDictionary *deviceEntry = [NSMutableDictionary dictionaryWithCapacity:[value count]];
+		[deviceEntry addEntriesFromDictionary:value];
+		[remote_devices setObject:deviceEntry forKey:key];
+	}
+	NSLog(@"read prefs %@", remote_devices );
+}
+
+static void db_close(){ 
+	NSLog(@"store prefs %@", remote_devices );
+    
+	NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
+    [defaults setPersistentDomain:remote_devices forName:BTdaemonID];
+    [defaults synchronize];
+    
+    [remote_devices release];
+    remote_devices = nil;
+}
+
+static NSString * stringForAddress(bd_addr_t* address) {
+	uint8_t *addr = (uint8_t*) *address;
+	return [NSString stringWithFormat:@"%02x:%02x:%02x:%02x:%02x:%02x", addr[0], addr[1], addr[2],
+			addr[3], addr[4], addr[5]];
+}
+                                
 static int  get_link_key(bd_addr_t *bd_addr, link_key_t *link_key) {
+    // get link key from deviceInfo
+	NSString *devAddress = stringForAddress(bd_addr);
+	NSMutableDictionary * deviceDict = [remote_devices objectForKey:devAddress];
+	NSData *linkKey = nil;
+	if (deviceDict){
+		linkKey = [deviceDict objectForKey:PREFS_LINK_KEY];
+        if ([linkKey length] == LINK_KEY_LEN){
+            NSLog(@"Link key for %@, value %@", devAddress, linkKey);
+            memcpy(link_key, [linkKey bytes], LINK_KEY_LEN);
+            return 1;
+        }
+	}
+    NSLog(@"Link key for %@ not found", devAddress);
     return 0;
 }
+
 static void put_link_key(bd_addr_t *bd_addr, link_key_t *link_key){
+	NSString *devAddress = stringForAddress(bd_addr);
+	NSMutableDictionary * deviceDict = [remote_devices objectForKey:devAddress];
+	NSData *linkKey = [NSData dataWithBytes:link_key length:16];
+	if (!deviceDict){
+		deviceDict = [NSMutableDictionary dictionaryWithCapacity:3];
+		[remote_devices setObject:deviceDict forKey:devAddress];
+	}
+	[deviceDict setObject:linkKey forKey:PREFS_LINK_KEY];
+	NSLog(@"Adding link key for %@, value %@", devAddress, linkKey);
 }
+
 static void delete_link_key(bd_addr_t *bd_addr){
+	NSString *devAddress = stringForAddress(bd_addr);
+	NSMutableDictionary * deviceDict = [remote_devices objectForKey:devAddress];
+	[deviceDict removeObjectForKey:PREFS_LINK_KEY];
+	NSLog(@"Removing link key for %@", devAddress);
 }
 
 static int  get_name(bd_addr_t *bd_addr, device_name_t *device_name) {
@@ -47,7 +115,13 @@ static void delete_name(bd_addr_t *bd_addr){
 }
 
 remote_device_db_t remote_device_db_iphone = {
-    get_link_key, put_link_key, delete_link_key,
-    get_name,     put_name,     delete_name
+    db_open,
+    db_close,
+    get_link_key,
+    put_link_key,
+    delete_link_key,
+    get_name,
+    put_name,
+    delete_name
 };