Disable BLE advertisement timeout

At BLE timeout, the ESB radio was also disabled.

src/ble/ble.c

@@ -105,7 +105,6 @@
 #define DEVICE_NAME                     "Crazyflie"                                /**< Name of device. Will be included in the advertising data. */
 #define MANUFACTURER_NAME               "Bitcraze AB"                               /**< Manufacturer. Will be passed to Device Information Service. */
 #define APP_ADV_INTERVAL                300                                         /**< The advertising interval (in units of 0.625 ms. This value corresponds to 187.5 ms). */
-#define APP_ADV_TIMEOUT_IN_SECONDS      180                                         /**< The advertising timeout in units of seconds. */
 
 #define APP_TIMER_PRESCALER             0                                           /**< Value of the RTC1 PRESCALER register. */
 #define APP_TIMER_OP_QUEUE_SIZE         4                                           /**< Size of timer operation queues. */
@@ -787,7 +786,7 @@ static void advertising_init(void)
     memset(&options, 0, sizeof(options));
     options.ble_adv_fast_enabled  = true;
     options.ble_adv_fast_interval = APP_ADV_INTERVAL;
-    options.ble_adv_fast_timeout  = APP_ADV_TIMEOUT_IN_SECONDS;
+    options.ble_adv_fast_timeout  = BLE_GAP_ADV_TIMEOUT_GENERAL_UNLIMITED;
 
     err_code = ble_advertising_init(&advdata, NULL, &options, on_adv_evt, NULL);
     APP_ERROR_CHECK(err_code);