diff --git a/src/hci.h b/src/hci.h
index 85de5fb29..23445a578 100644
--- a/src/hci.h
+++ b/src/hci.h
@@ -86,6 +86,18 @@
 // disconnect l2cap disconnect, @param channel(16), reason(8)
 #define L2CAP_DISCONNECT                                   0x21
 
+// register l2cap service: @param psm(16), mtu (16)
+#define L2CAP_REGISTER_SERVICE                             0x22
+
+// unregister l2cap disconnect, @param psm(16)
+#define L2CAP_UNREGISTER_SERVICE                           0x23
+
+// accept connection @param bd_addr(48), dest cid (16)
+#define L2CAP_ACCEPT_CONNECTION                            0x24
+
+// decline l2cap disconnect,@param bd_addr(48), dest cid (16), reason(8)
+#define L2CAP_DECLINE_CONNECTION                           0x25
+
 // 
 #define IS_COMMAND(packet, command) (READ_BT_16(packet,0) == command.opcode)
 
diff --git a/src/hci_cmds.c b/src/hci_cmds.c
index bc36d80fe..3774e79ab 100644
--- a/src/hci_cmds.c
+++ b/src/hci_cmds.c
@@ -311,5 +311,21 @@ hci_cmd_t l2cap_disconnect = {
 OPCODE(OGF_BTSTACK, L2CAP_DISCONNECT), "21"
 // @param channel(16), reason(8)
 };
+hci_cmd_t l2cap_register_service = {
+OPCODE(OGF_BTSTACK, L2CAP_REGISTER_SERVICE), "22"
+// @param psm (16), mtu (16)
+};
+hci_cmd_t l2cap_unregister_service = {
+OPCODE(OGF_BTSTACK, L2CAP_UNREGISTER_SERVICE), "2"
+// @param psm (16)
+};
+hci_cmd_t l2cap_accept_connection = {
+OPCODE(OGF_BTSTACK, L2CAP_ACCEPT_CONNECTION), "B2"
+// @param bd_addr(48), dest cid (16)
+};
+hci_cmd_t l2cap_decline_connection = {
+    OPCODE(OGF_BTSTACK, L2CAP_DECLINE_CONNECTION), "B2"
+    // @param bd_addr(48), dest cid (16)
+};
 
 
diff --git a/src/l2cap.c b/src/l2cap.c
index eb0fb7538..d9afdee72 100644
--- a/src/l2cap.c
+++ b/src/l2cap.c
@@ -392,7 +392,7 @@ l2cap_service_t * l2cap_get_service(uint16_t psm){
     return NULL;
 }
 
-void l2cap_register_service(connection_t *connection, uint16_t psm, uint16_t mtu){
+void l2cap_register_service_internal(connection_t *connection, uint16_t psm, uint16_t mtu){
     // check for alread registered psm // TODO: emit error event
     l2cap_service_t *service = l2cap_get_service(psm);
     if (service) return;
@@ -410,7 +410,7 @@ void l2cap_register_service(connection_t *connection, uint16_t psm, uint16_t mtu
     linked_list_add(&l2cap_services, (linked_item_t *) service);
 }
 
-void l2cap_unregister_service(connection_t *connection, uint16_t psm){
+void l2cap_unregister_service_internal(connection_t *connection, uint16_t psm){
     l2cap_service_t *service = l2cap_get_service(psm);
     if (service) return;
     linked_list_remove(&l2cap_services, (linked_item_t *) service);
diff --git a/src/l2cap.h b/src/l2cap.h
index 2d7e2664e..0ca15060d 100644
--- a/src/l2cap.h
+++ b/src/l2cap.h
@@ -104,8 +104,8 @@ void l2cap_finialize_channel_close(l2cap_channel_t *channel);
 void l2cap_close_connection(connection_t *connection);
 
 l2cap_service_t * l2cap_get_service(uint16_t psm);
-void l2cap_register_service(connection_t *connection, uint16_t psm, uint16_t);
-void l2cap_unregister_service(connection_t *connection, uint16_t psm);
+void l2cap_register_service_internal(connection_t *connection, uint16_t psm, uint16_t);
+void l2cap_unregister_service_internal(connection_t *connection, uint16_t psm);
 
 void l2cap_accept_connection(bd_addr_t address, uint16_t dest_cid);
 void l2cap_decline_connection(bd_addr_t address, uint16_t dest_cid, uint8_t reason);