Fatal error: BluetoothSerial.h: No such file or directory

YigalB · April 18, 2020, 3:07pm

I am using PIO with VScode. It works better that Arduino IDE, mostly it is working out of the box.
I just started my first BT project with ESP8266. All examples I saw required include of BluetoothSerial.h , yet it is reported as error when I compile. Should I import it? I couldn’t locate it in the lib manager. Thank you,

maxgerhardt · April 18, 2020, 4:26pm

I know the BluetoothSerial only from the Arduino-ESP32 framework, since the ESP32 has WiFi+BT.

github.com

espressif/arduino-esp32/blob/master/libraries/BluetoothSerial/src/BluetoothSerial.h

// Copyright 2018 Evandro Luis Copercini
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at

//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#ifndef _BLUETOOTH_SERIAL_H_
#define _BLUETOOTH_SERIAL_H_

#include "sdkconfig.h"

#if defined(CONFIG_BT_ENABLED) && defined(CONFIG_BLUEDROID_ENABLED)

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The ESP8266 only has 2.4GHz WiFi radio, it has no bluetooth capabilities. What extra chip did you use for Bluetooth with your ESP8266?

YigalB · April 18, 2020, 4:35pm

Aha, good point. I was assuming wrongly the ESP8266 has BT included. My bad.

maxgerhardt · April 18, 2020, 4:43pm

Then you may want to look into getting a e.g. HC-05 bluetooth-serial chip and using the built-in EspSoftwareSerial library, that way it’s practically the same functionality as the ESP32-Bluetooth Serial. See e.g.

YigalB · April 18, 2020, 4:53pm

Thanks, but I recall these parts require to modify the voltage from 5V to 3.3 using resistors, and not so easy to match BT. I am searching bow for ESP-12 which I am supposed to have somewhere, and it should fit the L293D motor shield.

YigalB · April 18, 2020, 5:35pm

Back to square 1:
I created noew project with ESP12, and still I get errors:
#include errors detected. Please update your includePath. Squiggles are disabled for

“message”: “cannot open source file “sdkconfig.h” (dependency of “BluetoothSerial.h”)”,

maxgerhardt · April 18, 2020, 5:40pm

The ESP12 is still an ESP8266-core module, so it won’t work with the BluetoothSerial.h header. The sdkconfig.h is something Arduino-ESP32 / ESP-IDF specific (configuration file).

YigalB · April 18, 2020, 5:52pm

In that case I will abort the motor shield since I will have to migrate to ESP32. It is what it is. Thanks.