disable BT Serial examples for S2

libraries/BluetoothSerial/examples/SerialToSerialBT/SerialToSerialBT.ino

@@ -3,6 +3,7 @@
 //
 //This example creates a bridge between Serial and Classical Bluetooth (SPP)
 //and also demonstrate that SerialBT have the same functionalities of a normal Serial
+#if CONFIG_IDF_TARGET_ESP32
 
 #include "BluetoothSerial.h"
 
@@ -26,4 +27,8 @@ void loop() {
     Serial.write(SerialBT.read());
   }
   delay(20);
-}
+}
+#else
+void setup() {}
+void loop() {}
+#endif

libraries/BluetoothSerial/examples/SerialToSerialBTM/SerialToSerialBTM.ino

@@ -5,6 +5,7 @@
 //it creates a bridge between Serial and Classical Bluetooth (SPP)
 //this is an extention of the SerialToSerialBT example by Evandro Copercini - 2018
 //
+#if CONFIG_IDF_TARGET_ESP32
 
 #include "BluetoothSerial.h"
 
@@ -54,3 +55,8 @@ void loop() {
   }
   delay(20);
 }
+#else
+void setup() {}
+void loop() {}
+#endif
+

libraries/BluetoothSerial/examples/bt_remove_paired_devices/bt_remove_paired_devices.ino

@@ -10,6 +10,7 @@
 //The only remedy is to delete this saved bound device from your device flash memory
 //and pair with the other device again.
 //
+#if CONFIG_IDF_TARGET_ESP32
 #include "esp_bt_main.h"
 #include "esp_bt_device.h"
 #include"esp_gap_bt_api.h"
@@ -85,3 +86,7 @@ void setup() {
 }
  
 void loop() {}
+#else
+void setup() {}
+void loop() {}
+#endif