diff --git a/lib/bluetooth.h b/lib/bluetooth.h
index d14217e..4a52ecb 100644
--- a/lib/bluetooth.h
+++ b/lib/bluetooth.h
@@ -141,6 +141,14 @@ struct bt_voice {
 #define BT_PHY_LE_CODED_TX	0x00002000
 #define BT_PHY_LE_CODED_RX	0x00004000
 
+#define BT_MODE			15
+
+#define BT_MODE_BASIC		0x00
+#define BT_MODE_ERTM		0x01
+#define BT_MODE_STREAMING	0x02
+#define BT_MODE_LE_FLOWCTL	0x03
+#define BT_MODE_EXT_FLOWCTL	0x04
+
 /* Connection and socket states */
 enum {
 	BT_CONNECTED = 1, /* Equal to TCP_ESTABLISHED to make net code happy */