diff --git a/src/btstack_defines.h b/src/btstack_defines.h
index a41c609aa..d26808a80 100644
--- a/src/btstack_defines.h
+++ b/src/btstack_defines.h
@@ -753,6 +753,21 @@ typedef uint8_t sm_key_t[16];
  */
 #define GATT_EVENT_CAN_WRITE_WITHOUT_RESPONSE                    0xAC
 
+/** 
+ * @format 1BH2
+ * @param address_type
+ * @param address
+ * @param handle
+ * @param l2cap_cid if BR/EDR bearer
+ */    
+#define ATT_EVENT_CONNECTED                                      0xB3
+
+/** 
+ * @format H
+ * @param handle
+ */    
+#define ATT_EVENT_DISCONNECTED                                   0xB4
+
 /** 
  * @format H2
  * @param handle
diff --git a/src/btstack_event.h b/src/btstack_event.h
index 748b56441..cbc194a09 100644
--- a/src/btstack_event.h
+++ b/src/btstack_event.h
@@ -2206,6 +2206,53 @@ static inline hci_con_handle_t gatt_event_can_write_without_response_get_handle(
 }
 #endif
 
+/**
+ * @brief Get field address_type from event ATT_EVENT_CONNECTED
+ * @param event packet
+ * @return address_type
+ * @note: btstack_type 1
+ */
+static inline uint8_t att_event_connected_get_address_type(const uint8_t * event){
+    return event[2];
+}
+/**
+ * @brief Get field address from event ATT_EVENT_CONNECTED
+ * @param event packet
+ * @param Pointer to storage for address
+ * @note: btstack_type B
+ */
+static inline void att_event_connected_get_address(const uint8_t * event, bd_addr_t address){
+    reverse_bd_addr(&event[3], address);
+}
+/**
+ * @brief Get field handle from event ATT_EVENT_CONNECTED
+ * @param event packet
+ * @return handle
+ * @note: btstack_type H
+ */
+static inline hci_con_handle_t att_event_connected_get_handle(const uint8_t * event){
+    return little_endian_read_16(event, 9);
+}
+/**
+ * @brief Get field l2cap_cid from event ATT_EVENT_CONNECTED
+ * @param event packet
+ * @return l2cap_cid
+ * @note: btstack_type 2
+ */
+static inline uint16_t att_event_connected_get_l2cap_cid(const uint8_t * event){
+    return little_endian_read_16(event, 11);
+}
+
+/**
+ * @brief Get field handle from event ATT_EVENT_DISCONNECTED
+ * @param event packet
+ * @return handle
+ * @note: btstack_type H
+ */
+static inline hci_con_handle_t att_event_disconnected_get_handle(const uint8_t * event){
+    return little_endian_read_16(event, 2);
+}
+
 /**
  * @brief Get field handle from event ATT_EVENT_MTU_EXCHANGE_COMPLETE
  * @param event packet