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鈴鹿高専Advent Calendar 2021

Day 19

ESP32とjoyconのBluetooth通信がうまくいかんだ話

Last updated at Posted at 2021-12-18

概要

ESP32でおもしろいことしたいなーと思い立ち、結果よくわからないまま失敗したあほの記事

やりたかったこと

ご存じESP32にはBluetooth通信の機能がついている。そしてjoyconにもBluetooth通信の機能がある。
じゃあいけるじゃん!と思い、やってみた

やったこと

まずbluetooth-command-line-toolsというのを用いてjoyconのMACアドレスを取得する。

image.png

次に以下のようなコードをESP32に書き込んだ

joyconL.ino
#if !defined(CONFIG_BT_ENABLED) || !defined(CONFIG_BLUEDROID_ENABLED)
#error Bluetooth is not enabled! Please run `make menuconfig` to and enable it
#endif

#include "BluetoothSerial.h"

BluetoothSerial SerialBT;

String MACadd = "D4:F0:57:D9:81:80";
uint8_t address[6]  = {0xD4, 0xF0, 0x57, 0xD9, 0x81, 0x80};
String name = "Joy-Con (L)";
char *pin = "1234"; //<- standard pin would be provided by default
bool connected;

void setup() {
  Serial.begin(115200);
  //SerialBT.setPin(pin);
  SerialBT.begin("ESP32_test", true); 
  //SerialBT.setPin(pin);
  Serial.println("The device started in master mode, make sure remote BT device is on!");
  
  // connect(address) is fast (upto 10 secs max), connect(name) is slow (upto 30 secs max) as it needs
  // to resolve name to address first, but it allows to connect to different devices with the same name.
  // Set CoreDebugLevel to Info to view devices bluetooth address and device names
  //connected = SerialBT.connect(name);
  connected = SerialBT.connect(address);
  
  if(connected) {
    Serial.println("Connected Succesfully!");
  } else {
    while(!SerialBT.connected(10000)) {
      Serial.println("Failed to connect. Make sure remote device is available and in range, then restart app."); 
    }
  }
  // disconnect() may take upto 10 secs max
  if (SerialBT.disconnect()) {
    Serial.println("Disconnected Succesfully!");
  }
  // this would reconnect to the name(will use address, if resolved) or address used with connect(name/address).
  SerialBT.connect();
}

void loop() {
  if (Serial.available()) {
    SerialBT.write(Serial.read());
  }
  if (SerialBT.available()) {
    Serial.write(SerialBT.read());
  }
  delay(20);
}

まあつながりませんでしたが。

反省

私は失敗したがやってる人はいたからできることではある
ESP32がbluetooth3.0に対応していない可能性を考えたが、ネットにbluetooth3.0のコントローラーと通信してそうな記事があったので違いそう
また再挑戦はします……

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