基于Arduino ESP32的BLE键盘实现

硬件 ESP32， 基础平台 Arduino，编程工具使用VS PlatformIO.
首先，platformio.ini

; PlatformIO Project Configuration File
;
;   Build options: build flags, source filter
;   Upload options: custom upload port, speed and extra flags
;   Library options: dependencies, extra library storages
;   Advanced options: extra scripting
;
; Please visit documentation for the other options and examples
; https://docs.platformio.org/page/projectconf.html

[env:pico32]
platform = espressif32
board = pico32
framework = arduino
lib_extra_dirs = ~/Documents/Arduino/libraries

主函数 main.cpp

// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
//
// 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.

// Sketch shows how to use SimpleBLE to advertise the name of the device and change it on the press of a button
// Useful if you want to advertise some sort of message
// Button is attached between GPIO 0 and GND, and the device name changes each time the button is pressed
#include <Arduino.h>
#include <WiFi.h>
#include <BleKeyboard.h>

BleKeyboard bleKeyboard("ESP32 BLE Keyboard");

void setup() {
  Serial.begin(115200);
  Serial.println("Starting BLE work!");
  // Serial.setTimeout(100);
  bleKeyboard.begin();
  // bleKeyboard.setDelay(10);
  Serial.println("Wait input you message!");
}

void loop() {
  if(bleKeyboard.isConnected()) {
      int n = 0;
      while( Serial.available() ) {
        int c = Serial.read();
        bleKeyboard.write(c);
        n+=1;
        delay(10);
      }
          
      if( n > 0 ){
          Serial.printf("Sending '%d' charactors.\r\n", n);
      }

    // Serial.println("Sending 'Hello world'...");
    // bleKeyboard.print("Hello world");

    // delay(1000);

    // Serial.println("Sending Enter key...");
    // bleKeyboard.write(KEY_RETURN);

    // delay(1000);

    // Serial.println("Sending Play/Pause media key...");
    // bleKeyboard.write(KEY_MEDIA_PLAY_PAUSE);

    // delay(1000);

    // Serial.println("Sending Ctrl+Alt+Delete...");
    // bleKeyboard.press(KEY_LEFT_CTRL);
    // bleKeyboard.press(KEY_LEFT_ALT);
    // bleKeyboard.press(KEY_DELETE);
    // delay(100);
    // bleKeyboard.releaseAll();
  }

  Serial.println("Waiting 0.5 seconds...");
  delay(500);
}

依赖 BLEKeyboard库，来源GITHUB。
https://github.com/T-vK/ESP32-BLE-Keyboard

参考ESP32文档：
https://docs.espressif.com/projects/esp-idf/zh_CN/latest/esp32/api-reference/index.html

后记

Arduino的API没有找到一个完善的文档，特别是ESP32本身拥有的API，对于我这种对协议细节不太了解的，想要自己实现功能会特别困难，不知道哪位大佬能给予指点！

如果有ESP32中文文档或者组合使用API介绍，那样ESP32的发展会更好！