Conditionally compile code for specific roles.

This allows NimBLE options in menuconfig to reduce code size based on
the roles selected (scan/advertising/central/peripheral).

Significant code space can be saved by removing unnecessary roles for the application.

src/NimBLEAdvertisedDevice.h

@@ -3,7 +3,7 @@
  *
  *  Created: on Jan 24 2020
  *      Author H2zero
- * 
+ *
  * Originally:
  *
  * BLEAdvertisedDevice.h
@@ -17,6 +17,9 @@
 #include "sdkconfig.h"
 #if defined(CONFIG_BT_ENABLED)
 
+#include "nimconfig.h"
+#if defined(CONFIG_BT_NIMBLE_ROLE_OBSERVER)
+
 #include "NimBLEAddress.h"
 #include "NimBLEScan.h"
 #include "NimBLEUUID.h"
@@ -24,7 +27,7 @@
 #include "host/ble_hs_adv.h"
 
 #include <map>
-#include <vector> 
+#include <vector>
 
 
 class NimBLEScan;
@@ -129,5 +132,6 @@ public:
     virtual void onResult(NimBLEAdvertisedDevice* advertisedDevice) = 0;
 };
 
+#endif // #if defined( CONFIG_BT_NIMBLE_ROLE_CENTRAL)
 #endif /* CONFIG_BT_ENABLED */
 #endif /* COMPONENTS_NIMBLEADVERTISEDDEVICE_H_ */