send ltk as master

Author: paul-szczepanek-arm

.project

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>mbed-os-example-ble</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+	</buildSpec>
+	<natures>
+	</natures>
+</projectDescription>

BLE_SM/source/main.cpp

@@ -304,6 +304,8 @@ class SMDevicePeripheral : public SMDevice {
          * can proceed. Setting it to false will automatically accept
          * pairing. */
         _ble.securityManager().setPairingRequestAuthorisation(true);
+
+        _ble.securityManager().setHintFutureRoleReversal(true);
     };
 
     /** This is called by Gap to notify the application we connected,