diff --git a/CHANGELOG.md b/CHANGELOG.md
index 926c8e76a..a6d49e6ec 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -26,6 +26,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - bluetooth.h: extract internal defintitions to respective protocol layers
 - Updated CC256x initscripts (CC256xB v1.8, CC256xC v1.2)
 - libusb and posix ports: store bonding information in TLV
+- Linked List: return bool true if item was removed
+- btstack_run_loop_remove: return bool true if timer/data source was removed
 
 ## Changes August 2019
 
diff --git a/platform/corefoundation/btstack_run_loop_corefoundation.m b/platform/corefoundation/btstack_run_loop_corefoundation.m
index 2d545609a..8e0e820b8 100644
--- a/platform/corefoundation/btstack_run_loop_corefoundation.m
+++ b/platform/corefoundation/btstack_run_loop_corefoundation.m
@@ -158,7 +158,7 @@ static void btstack_run_loop_embedded_disable_data_source_callbacks(btstack_data
     CFSocketDisableCallBacks(references->socket, option_flags);   
 }
 
-static int  btstack_run_loop_corefoundation_remove_data_source(btstack_data_source_t *ds){
+static bool  btstack_run_loop_corefoundation_remove_data_source(btstack_data_source_t *ds){
     btstack_corefoundation_data_source_helper_t * references = (btstack_corefoundation_data_source_helper_t *) ds->item.next;
     // printf("btstack_run_loop_corefoundation_remove_data_source %x - fd %u, CFSocket %x, CFRunLoopSource %x\n", (int) dataSource, dataSource->source.fd, (int) dataSource->item.next, (int) dataSource->item.user_data);
     CFRunLoopRemoveSource( CFRunLoopGetCurrent(), references->socket_run_loop, kCFRunLoopCommonModes);
@@ -168,7 +168,7 @@ static int  btstack_run_loop_corefoundation_remove_data_source(btstack_data_sour
     CFRelease(references->socket);
 
     free(references);
-	return 0;
+	return true;
 }
 
 static void btstack_run_loop_corefoundation_add_timer(btstack_timer_source_t * ts)
@@ -189,8 +189,9 @@ static int btstack_run_loop_corefoundation_remove_timer(btstack_timer_source_t *
 	if (ts->item.next != NULL) {
     	CFRunLoopTimerInvalidate((CFRunLoopTimerRef) ts->item.next);    // also removes timer from run loops + releases it
     	CFRelease((CFRunLoopTimerRef) ts->item.next);
+        return true;
 	}
-	return 0;
+	return false;
 }
 
 /**
diff --git a/platform/embedded/btstack_run_loop_embedded.c b/platform/embedded/btstack_run_loop_embedded.c
index b42558253..7d1c71d47 100644
--- a/platform/embedded/btstack_run_loop_embedded.c
+++ b/platform/embedded/btstack_run_loop_embedded.c
@@ -101,7 +101,7 @@ static void btstack_run_loop_embedded_add_data_source(btstack_data_source_t *ds)
 /**
  * Remove data_source from run loop
  */
-static int btstack_run_loop_embedded_remove_data_source(btstack_data_source_t *ds){
+static bool btstack_run_loop_embedded_remove_data_source(btstack_data_source_t *ds){
     return btstack_linked_list_remove(&data_sources, (btstack_linked_item_t *) ds);
 }
 
@@ -144,7 +144,7 @@ static void btstack_run_loop_embedded_add_timer(btstack_timer_source_t *ts){
 /**
  * Remove timer from run loop
  */
-static int btstack_run_loop_embedded_remove_timer(btstack_timer_source_t *ts){
+static bool btstack_run_loop_embedded_remove_timer(btstack_timer_source_t *ts){
 #ifdef TIMER_SUPPORT
     return btstack_linked_list_remove(&timers, (btstack_linked_item_t *) ts);
 #else
diff --git a/platform/freertos/btstack_run_loop_freertos.c b/platform/freertos/btstack_run_loop_freertos.c
index db93d35e6..2972e5c53 100644
--- a/platform/freertos/btstack_run_loop_freertos.c
+++ b/platform/freertos/btstack_run_loop_freertos.c
@@ -138,7 +138,7 @@ static void btstack_run_loop_freertos_add_timer(btstack_timer_source_t *ts){
 /**
  * Remove timer from run loop
  */
-static int btstack_run_loop_freertos_remove_timer(btstack_timer_source_t *ts){
+static bool btstack_run_loop_freertos_remove_timer(btstack_timer_source_t *ts){
     return btstack_linked_list_remove(&timers, (btstack_linked_item_t *) ts);
 }
 
@@ -267,7 +267,7 @@ static void btstack_run_loop_freertos_add_data_source(btstack_data_source_t *ds)
     btstack_linked_list_add(&data_sources, (btstack_linked_item_t *) ds);
 }
 
-static int btstack_run_loop_freertos_remove_data_source(btstack_data_source_t *ds){
+static bool btstack_run_loop_freertos_remove_data_source(btstack_data_source_t *ds){
     return btstack_linked_list_remove(&data_sources, (btstack_linked_item_t *) ds);
 }
 
diff --git a/platform/posix/btstack_run_loop_posix.c b/platform/posix/btstack_run_loop_posix.c
index 576d4e691..9d1ae8f1b 100644
--- a/platform/posix/btstack_run_loop_posix.c
+++ b/platform/posix/btstack_run_loop_posix.c
@@ -88,7 +88,7 @@ static void btstack_run_loop_posix_add_data_source(btstack_data_source_t *ds){
 /**
  * Remove data_source from run loop
  */
-static int btstack_run_loop_posix_remove_data_source(btstack_data_source_t *ds){
+static bool btstack_run_loop_posix_remove_data_source(btstack_data_source_t *ds){
     data_sources_modified = 1;
     log_debug("btstack_run_loop_posix_remove_data_source %p\n", ds);
     return btstack_linked_list_remove(&data_sources, (btstack_linked_item_t *) ds);
@@ -115,7 +115,7 @@ static void btstack_run_loop_posix_add_timer(btstack_timer_source_t *ts){
 /**
  * Remove timer from run loop
  */
-static int btstack_run_loop_posix_remove_timer(btstack_timer_source_t *ts){
+static bool btstack_run_loop_posix_remove_timer(btstack_timer_source_t *ts){
     // log_info("Removed timer %x at %u\n", (int) ts, (unsigned int) ts->timeout.tv_sec);
     // btstack_run_loop_posix_dump_timer();
     return btstack_linked_list_remove(&timers, (btstack_linked_item_t *) ts);
diff --git a/platform/wiced/btstack_run_loop_wiced.c b/platform/wiced/btstack_run_loop_wiced.c
index a8872d512..42915c446 100644
--- a/platform/wiced/btstack_run_loop_wiced.c
+++ b/platform/wiced/btstack_run_loop_wiced.c
@@ -101,7 +101,7 @@ static void btstack_run_loop_wiced_add_timer(btstack_timer_source_t *ts){
 /**
  * Remove timer from run loop
  */
-static int btstack_run_loop_wiced_remove_timer(btstack_timer_source_t *ts){
+static bool btstack_run_loop_wiced_remove_timer(btstack_timer_source_t *ts){
     return btstack_linked_list_remove(&timers, (btstack_linked_item_t *) ts);
 }
 
diff --git a/platform/windows/btstack_run_loop_windows.c b/platform/windows/btstack_run_loop_windows.c
index a94fa1b5a..d6bb4ae8b 100644
--- a/platform/windows/btstack_run_loop_windows.c
+++ b/platform/windows/btstack_run_loop_windows.c
@@ -73,7 +73,7 @@ static void btstack_run_loop_windows_add_data_source(btstack_data_source_t *ds){
 /**
  * Remove data_source from run loop
  */
-static int btstack_run_loop_windows_remove_data_source(btstack_data_source_t *ds){
+static bool btstack_run_loop_windows_remove_data_source(btstack_data_source_t *ds){
     data_sources_modified = 1;
     // log_info("btstack_run_loop_windows_remove_data_source %x\n", (int) ds);
     return btstack_linked_list_remove(&data_sources, (btstack_linked_item_t *) ds);
@@ -104,7 +104,7 @@ static void btstack_run_loop_windows_add_timer(btstack_timer_source_t *ts){
 /**
  * Remove timer from run loop
  */
-static int btstack_run_loop_windows_remove_timer(btstack_timer_source_t *ts){
+static bool btstack_run_loop_windows_remove_timer(btstack_timer_source_t *ts){
     // log_info("Removed timer %x at %u\n", (int) ts, (unsigned int) ts->timeout.tv_sec);
     // btstack_run_loop_windows_dump_timer();
     return btstack_linked_list_remove(&timers, (btstack_linked_item_t *) ts);
diff --git a/src/btstack_linked_list.c b/src/btstack_linked_list.c
index e3cf65e08..207078f5b 100644
--- a/src/btstack_linked_list.c
+++ b/src/btstack_linked_list.c
@@ -100,16 +100,16 @@ bool btstack_linked_list_add_tail(btstack_linked_list_t * list, btstack_linked_i
     return true;
 }
 
-int  btstack_linked_list_remove(btstack_linked_list_t * list, btstack_linked_item_t *item){    // <-- remove item from list
-    if (!item) return -1;
+bool  btstack_linked_list_remove(btstack_linked_list_t * list, btstack_linked_item_t *item){    // <-- remove item from list
+    if (!item) return false;
     btstack_linked_item_t *it;
     for (it = (btstack_linked_item_t *) list; it ; it = it->next){
         if (it->next == item){
             it->next =  item->next;
-            return 0;
+            return true;
         }
     }
-    return -1;
+    return false;
 }
 
 /**
diff --git a/src/btstack_linked_list.h b/src/btstack_linked_list.h
index 6d6712d58..dccd88003 100644
--- a/src/btstack_linked_list.h
+++ b/src/btstack_linked_list.h
@@ -97,9 +97,9 @@ btstack_linked_item_t * btstack_linked_list_pop(btstack_linked_list_t * list);
  * @brief Remove item from list
  * @param list
  * @param item
- * @returns 0 if item was found in list, -1 if item was not in list
+ * @returns true if item was removed, false if it is no't in list
  */
-int btstack_linked_list_remove(btstack_linked_list_t * list, btstack_linked_item_t *item); 
+bool btstack_linked_list_remove(btstack_linked_list_t * list, btstack_linked_item_t *item);
 
 /**
  * @brief Get first element.
diff --git a/src/btstack_run_loop.h b/src/btstack_run_loop.h
index 56fd5c659..70227f3df 100644
--- a/src/btstack_run_loop.h
+++ b/src/btstack_run_loop.h
@@ -46,6 +46,7 @@
 
 #include "btstack_config.h"
 
+#include "btstack_bool.h"
 #include "btstack_linked_list.h"
 
 #include <stdint.h>
@@ -96,12 +97,12 @@ typedef struct btstack_timer_source {
 typedef struct btstack_run_loop {
 	void (*init)(void);
 	void (*add_data_source)(btstack_data_source_t * data_source);
-	int  (*remove_data_source)(btstack_data_source_t * data_source);
+	bool (*remove_data_source)(btstack_data_source_t * data_source);
 	void (*enable_data_source_callbacks)(btstack_data_source_t * data_source, uint16_t callbacks);
 	void (*disable_data_source_callbacks)(btstack_data_source_t * data_source, uint16_t callbacks);
 	void (*set_timer)(btstack_timer_source_t * timer, uint32_t timeout_in_ms);
 	void (*add_timer)(btstack_timer_source_t *timer);
-	int  (*remove_timer)(btstack_timer_source_t *timer); 
+	bool  (*remove_timer)(btstack_timer_source_t *timer);
 	void (*execute)(void);
 	void (*dump_timer)(void);
 	uint32_t (*get_time_ms)(void);
diff --git a/src/btstack_run_loop_base.c b/src/btstack_run_loop_base.c
index aaee65e21..640c8e8e7 100644
--- a/src/btstack_run_loop_base.c
+++ b/src/btstack_run_loop_base.c
@@ -62,7 +62,7 @@ void btstack_run_loop_base_add_data_source(btstack_data_source_t *ds){
     btstack_linked_list_add(&btstack_run_loop_base_data_sources, (btstack_linked_item_t *) ds);
 }
 
-int btstack_run_loop_base_remove_data_source(btstack_data_source_t *ds){
+bool btstack_run_loop_base_remove_data_source(btstack_data_source_t *ds){
     return btstack_linked_list_remove(&btstack_run_loop_base_data_sources, (btstack_linked_item_t *) ds);
 }
 
@@ -75,7 +75,7 @@ void btstack_run_loop_base_disable_data_source_callbacks(btstack_data_source_t *
 }
 
 
-int btstack_run_loop_base_remove_timer(btstack_timer_source_t *ts){
+bool btstack_run_loop_base_remove_timer(btstack_timer_source_t *ts){
     return btstack_linked_list_remove(&btstack_run_loop_base_timers, (btstack_linked_item_t *) ts);
 }
 
diff --git a/src/btstack_run_loop_base.h b/src/btstack_run_loop_base.h
index 579be731d..91bbf439e 100644
--- a/src/btstack_run_loop_base.h
+++ b/src/btstack_run_loop_base.h
@@ -65,13 +65,16 @@ void btstack_run_loop_base_init(void);
 
 /**
  * @brief Add timer source.
+ * @param timer to add
  */
 void btstack_run_loop_base_add_timer(btstack_timer_source_t * timer); 
 
 /**
  * @brief Remove timer source.
+ * @param timer to remove
+ * @returns true if timer was removed
  */
-int  btstack_run_loop_base_remove_timer(btstack_timer_source_t * timer);
+bool  btstack_run_loop_base_remove_timer(btstack_timer_source_t * timer);
 
 /**
  * @brief Process timers: remove expired timers from list and call their process function
@@ -94,8 +97,9 @@ void btstack_run_loop_base_add_data_source(btstack_data_source_t * data_source);
 /**
  * @brief Remove data source from run loop
  * @param data_source to remove
+ * @returns true if data srouce was removed
  */
-int btstack_run_loop_base_remove_data_source(btstack_data_source_t * data_source);
+bool btstack_run_loop_base_remove_data_source(btstack_data_source_t * data_source);
 
 /**
  * @brief Enable callbacks for a data source
diff --git a/src/mesh/mesh_keys.c b/src/mesh/mesh_keys.c
index c18aab62d..e0f97f615 100644
--- a/src/mesh/mesh_keys.c
+++ b/src/mesh/mesh_keys.c
@@ -69,7 +69,7 @@ void mesh_network_key_add(mesh_network_key_t * network_key){
     btstack_linked_list_add_tail(&network_keys, (btstack_linked_item_t *) network_key);
 }
 
-int mesh_network_key_remove(mesh_network_key_t * network_key){
+bool mesh_network_key_remove(mesh_network_key_t * network_key){
     mesh_network_key_used[network_key->internal_index] = 0;
     return btstack_linked_list_remove(&network_keys, (btstack_linked_item_t *) network_key);
 }
@@ -161,7 +161,7 @@ void mesh_transport_key_add(mesh_transport_key_t * transport_key){
     btstack_linked_list_add_tail(&application_keys, (btstack_linked_item_t *) transport_key);
 }
 
-int mesh_transport_key_remove(mesh_transport_key_t * transport_key){
+bool mesh_transport_key_remove(mesh_transport_key_t * transport_key){
     mesh_transport_key_used[transport_key->internal_index] = 0;
     return btstack_linked_list_remove(&application_keys, (btstack_linked_item_t *) transport_key);
 }
diff --git a/src/mesh/mesh_keys.h b/src/mesh/mesh_keys.h
index 86f1bd2ce..8f972b56c 100644
--- a/src/mesh/mesh_keys.h
+++ b/src/mesh/mesh_keys.h
@@ -150,10 +150,10 @@ void mesh_network_key_add(mesh_network_key_t * network_key);
 /**
  * @brief Remove network key from list
  * @param network_key
- * @return 0 if removed
+ * @return true if removed
  * @note key is only removed from list, memory is not released
  */
-int mesh_network_key_remove(mesh_network_key_t * network_key);
+bool mesh_network_key_remove(mesh_network_key_t * network_key);
 
 /**
  * @brief Get network_key for netkey_index
@@ -239,7 +239,7 @@ void mesh_transport_key_add(mesh_transport_key_t * transport_key);
  * @return 0 if removed
  * @note key is only removed from list, memory is not released
  */
-int mesh_transport_key_remove(mesh_transport_key_t * transport_key);
+bool mesh_transport_key_remove(mesh_transport_key_t * transport_key);
 
 /**
  * Get transport key for appkey_index