From ad33f8fc762768ac887009d6d1e8587cec06b636 Mon Sep 17 00:00:00 2001
From: Klaus K Wilting <Klaus.K.Wilting@deutschebahn.com>
Date: Sun, 16 Dec 2018 16:50:37 +0100
Subject: [PATCH] deinit Bluetooth while device starts if not compiled

---
 src/blecsan.cpp | 2 +-
 src/main.cpp    | 7 +++++++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/blecsan.cpp b/src/blecsan.cpp
index a708948a..c4d10865 100644
--- a/src/blecsan.cpp
+++ b/src/blecsan.cpp
@@ -272,7 +272,7 @@ void stop_BLEscan(void) {
   ESP_ERROR_CHECK(esp_ble_gap_register_callback(NULL));
   ESP_ERROR_CHECK(esp_bluedroid_disable());
   ESP_ERROR_CHECK(esp_bluedroid_deinit());
-  btStop(); // disable & deinit bt_controller
+  btStop(); // disable bt_controller
   ESP_ERROR_CHECK(esp_coex_preference_set((
       esp_coex_prefer_t)ESP_COEX_PREFER_WIFI)); // configure Wifi/BT coexist lib
   ESP_LOGI(TAG, "Bluetooth scanner stopped");
diff --git a/src/main.cpp b/src/main.cpp
index 192f7973..57ea9fcb 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -176,7 +176,14 @@ void setup() {
   } else
     btStop();
 #else
+  // remove bluetooth stack to gain more free memory
+  ESP_ERROR_CHECK(esp_bluedroid_disable());
+  ESP_ERROR_CHECK(esp_bluedroid_deinit());
   btStop();
+  ESP_ERROR_CHECK(esp_bt_controller_deinit());
+  ESP_ERROR_CHECK(esp_bt_mem_release(ESP_BT_MODE_BTDM));
+  ESP_ERROR_CHECK(esp_coex_preference_set((
+      esp_coex_prefer_t)ESP_COEX_PREFER_WIFI)); // configure Wifi/BT coexist lib
 #endif
 
 // initialize button