feature(BluetoothSerial): add pinCode function

Author: xiongyumail

Diff for: libraries/BluetoothSerial/examples/SerialToSerialBT/SerialToSerialBT.ino

@@ -6,15 +6,12 @@
 
 #include "BluetoothSerial.h"
 
-#if !defined(CONFIG_BT_ENABLED) || !defined(CONFIG_BLUEDROID_ENABLED)
-#error Bluetooth is not enabled! Please run `make menuconfig` to and enable it
-#endif
-
 BluetoothSerial SerialBT;
 
 void setup() {
   Serial.begin(115200);
   SerialBT.begin("ESP32test"); //Bluetooth device name
+  SerialBT.pinCode("1234"); //Bluetooth device password
   Serial.println("The device started, now you can pair it with bluetooth!");
 }
 

Diff for: libraries/BluetoothSerial/src/BluetoothSerial.cpp

@@ -235,7 +235,7 @@ static void esp_spp_cb(esp_spp_cb_event_t event, esp_spp_cb_param_t *param)
     if(custom_spp_callback)(*custom_spp_callback)(event, param);
 }
 
-static bool _init_bt(const char *deviceName)
+static bool _init_bt(const char *deviceName, const char *pswd)
 {
     if(!_spp_event_group){
         _spp_event_group = xEventGroupCreate();
@@ -319,6 +319,11 @@ static bool _init_bt(const char *deviceName)
         return false;
     }
 
+    if (esp_bt_gap_set_pin(ESP_BT_PIN_TYPE_FIXED, strlen(pswd), (uint8_t *)pswd) != ESP_OK) {
+        log_e("set pincode failed");
+        return false;
+    }
+
     return true;
 }
 
@@ -369,6 +374,7 @@ static bool _stop_bt()
 BluetoothSerial::BluetoothSerial()
 {
     local_name = "ESP32"; //default bluetooth name
+    pin_code = "0000"; //default bluetooth password
 }
 
 BluetoothSerial::~BluetoothSerial(void)
@@ -381,7 +387,17 @@ bool BluetoothSerial::begin(String localName)
     if (localName.length()){
         local_name = localName;
     }
-    return _init_bt(local_name.c_str());
+    return _init_bt(local_name.c_str(), pin_code.c_str());
+}
+
+bool BluetoothSerial::pinCode(String pswd)
+{
+    if (pswd.length() == 0 || pswd.length() > ESP_BT_PIN_CODE_LEN) {
+        return false;
+    }
+    
+    esp_bt_gap_set_pin(ESP_BT_PIN_TYPE_FIXED, pswd.length(), (uint8_t *)pswd.c_str());
+    return true;
 }
 
 int BluetoothSerial::available(void)

Diff for: libraries/BluetoothSerial/src/BluetoothSerial.h

@@ -22,6 +22,7 @@
 #include "Arduino.h"
 #include "Stream.h"
 #include <esp_spp_api.h>
+#include "esp_gap_bt_api.h"   
 
 class BluetoothSerial: public Stream
 {
@@ -31,6 +32,7 @@ class BluetoothSerial: public Stream
         ~BluetoothSerial(void);
 
         bool begin(String localName=String());
+        bool pinCode(String pswd);
         int available(void);
         int peek(void);
         bool hasClient(void);
@@ -43,6 +45,7 @@ class BluetoothSerial: public Stream
 
     private:
         String local_name;
+        String pin_code;
 
 };