add C++ protection for BLE headers

ble/att_server.h

@@ -39,6 +39,10 @@
 #include <stdint.h>
 #include "att.h"
 
+#if defined __cplusplus
+extern "C" {
+#endif
+
  /*
   * @brief setup ATT server
   * @param db attribute database created by compile-gatt.ph
@@ -68,3 +72,7 @@ void att_server_notify(uint16_t handle, uint8_t *value, uint16_t value_len);
  * @brief indicate value change to client. client is supposed to reply with an indication_response
  */
 void att_server_indicate(uint16_t handle, uint8_t *value, uint16_t value_len);
+
+#if defined __cplusplus
+}
+#endif

ble/central_device_db.h

@@ -38,6 +38,10 @@
 
 #include <btstack/utils.h>
 
+#if defined __cplusplus
+extern "C" {
+#endif
+
 /** 
 
 	A Central Device DB is only required for signed writes

ble/gap_le.h

@@ -36,6 +36,10 @@
 
 #pragma once
 
+#if defined __cplusplus
+extern "C" {
+#endif
+
 typedef enum {
     GAP_RANDOM_ADDRESS_TYPE_OFF = 0,
     GAP_RANDOM_ADDRESS_NON_RESOLVABLE,
@@ -54,4 +58,7 @@ void gap_random_address_set_mode(gap_random_address_type_t random_address_type);
  */
  void gap_random_address_set_update_period(int period_ms);
 
+#if defined __cplusplus
+}
+#endif