From a6ca6916c23f312f4e3f234e1ab3d06fef8e4074 Mon Sep 17 00:00:00 2001
From: David Lechner <david@pybricks.com>
Date: Tue, 23 Mar 2021 12:15:14 -0500
Subject: [PATCH] Fix compile error when ENABLE_LE_CENTRAL is not set

This fixes the following errors:

    ../../lib/btstack/src/ble/sm.c: In function 'sm_pdu_handler':
    ../../lib/btstack/src/ble/sm.c:3823:13: error: unused variable 'ltk' [-Werror=unused-variable]
    3823 |     uint8_t ltk[16];
        |             ^~~
    ../../lib/btstack/src/ble/sm.c:3822:9: error: unused variable 'have_ltk' [-Werror=unused-variable]
    3822 |     int have_ltk;
        |         ^~~~~~~~
---
 src/ble/sm.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/ble/sm.c b/src/ble/sm.c
index 6a16b8467..546e04c69 100644
--- a/src/ble/sm.c
+++ b/src/ble/sm.c
@@ -3819,8 +3819,10 @@ static void sm_pdu_handler(uint8_t packet_type, hci_con_handle_t con_handle, uin
         return;
     }
 
+#ifdef ENABLE_LE_CENTRAL
     int have_ltk;
     uint8_t ltk[16];
+#endif
 
     switch (sm_conn->sm_engine_state){