From 24741cc0de54941cacabe4765eecec7b6224cbfe Mon Sep 17 00:00:00 2001
From: Rahul Tank <rahul.tank@espressif.com>
Date: Wed, 6 Jul 2022 10:06:32 +0530
Subject: [PATCH] NimBLE: Added option to advertise random address

---
 .../nimble/bleprph/main/Kconfig.projbuild     |  5 +++
 examples/bluetooth/nimble/bleprph/main/main.c | 31 +++++++++++++++++++
 2 files changed, 36 insertions(+)

diff --git a/examples/bluetooth/nimble/bleprph/main/Kconfig.projbuild b/examples/bluetooth/nimble/bleprph/main/Kconfig.projbuild
index e51f9a38b6..89cfef1c51 100644
--- a/examples/bluetooth/nimble/bleprph/main/Kconfig.projbuild
+++ b/examples/bluetooth/nimble/bleprph/main/Kconfig.projbuild
@@ -55,4 +55,9 @@ menu "Example Configuration"
         help
             Use this option to enable extended advertising in the example
 
+    config EXAMPLE_RANDOM_ADDR
+        bool
+        prompt "Advertise RANDOM Address"
+        help
+            Use this option to advertise a random address instead of public address
 endmenu
diff --git a/examples/bluetooth/nimble/bleprph/main/main.c b/examples/bluetooth/nimble/bleprph/main/main.c
index 783d77d79c..5580e0e3e6 100644
--- a/examples/bluetooth/nimble/bleprph/main/main.c
+++ b/examples/bluetooth/nimble/bleprph/main/main.c
@@ -39,7 +39,11 @@ static uint8_t ext_adv_pattern_1[] = {
 
 static const char *tag = "NimBLE_BLE_PRPH";
 static int bleprph_gap_event(struct ble_gap_event *event, void *arg);
+#if CONFIG_EXAMPLE_RANDOM_ADDR
+static uint8_t own_addr_type = BLE_OWN_ADDR_RANDOM;
+#else
 static uint8_t own_addr_type;
+#endif
 
 void ble_store_config_init(void);
 
@@ -368,13 +372,40 @@ bleprph_on_reset(int reason)
     MODLOG_DFLT(ERROR, "Resetting state; reason=%d\n", reason);
 }
 
+#if CONFIG_EXAMPLE_RANDOM_ADDR
+static void
+ble_app_set_addr(void)
+{
+    ble_addr_t addr;
+    int rc;
+
+    /* generate new non-resolvable private address */
+    rc = ble_hs_id_gen_rnd(0, &addr);
+    assert(rc == 0);
+
+    /* set generated address */
+    rc = ble_hs_id_set_rnd(addr.val);
+
+    assert(rc == 0);
+}
+#endif
+
 static void
 bleprph_on_sync(void)
 {
     int rc;
 
+#if CONFIG_EXAMPLE_RANDOM_ADDR
+    /* Generate a non-resolvable private address. */
+    ble_app_set_addr();
+#endif
+
     /* Make sure we have proper identity address set (public preferred) */
+#if CONFIG_EXAMPLE_RANDOM_ADDR
+    rc = ble_hs_util_ensure_addr(1);
+#else
     rc = ble_hs_util_ensure_addr(0);
+#endif
     assert(rc == 0);
 
     /* Figure out address to use while advertising (no privacy for now) */