Fixes Pointer and Call using Serial BT callback (espressif#9245)

* SerialBT (fix): fixes the callback function pointer

* SerialBT(fix): fixes callback pointer reference and call

* Update BluetoothSerial.h

Author: SuGlider

libraries/BluetoothSerial/src/BluetoothSerial.cpp

@@ -55,7 +55,7 @@ static TaskHandle_t _spp_task_handle = NULL;
 static EventGroupHandle_t _spp_event_group = NULL;
 static EventGroupHandle_t _bt_event_group = NULL;
 static boolean secondConnectionAttempt;
-static esp_spp_cb_t * custom_spp_callback = NULL;
+static esp_spp_cb_t custom_spp_callback = NULL;
 static BluetoothSerialDataCb custom_data_callback = NULL;
 static esp_bd_addr_t current_bd_addr;
 static ConfirmRequestCb confirm_request_callback = NULL;
@@ -945,7 +945,7 @@ void BluetoothSerial::confirmReply(boolean confirm)
 }
 
 
-esp_err_t BluetoothSerial::register_callback(esp_spp_cb_t * callback)
+esp_err_t BluetoothSerial::register_callback(esp_spp_cb_t callback)
 {
     custom_spp_callback = callback;
     return ESP_OK;

libraries/BluetoothSerial/src/BluetoothSerial.h

@@ -28,7 +28,6 @@
 #include "BTScan.h"
 #include "BTAdvertisedDevice.h"
 
-
 typedef std::function<void(const uint8_t *buffer, size_t size)> BluetoothSerialDataCb;
 typedef std::function<void(uint32_t num_val)> ConfirmRequestCb;
 typedef std::function<void()> KeyRequestCb;
@@ -57,7 +56,7 @@ class BluetoothSerial: public Stream
         void memrelease();
         void setTimeout(int timeoutMS);
         void onData(BluetoothSerialDataCb cb);
-        esp_err_t register_callback(esp_spp_cb_t * callback);
+        esp_err_t register_callback(esp_spp_cb_t callback);
 
 #ifdef CONFIG_BT_SSP_ENABLED
         void onConfirmRequest(ConfirmRequestCb cb);