ESP32-C6与手机蓝牙通信报错
ESP32-C6与手机蓝牙通信报错错误类型：error: conversion from 'String' to non-scalar type 'std::string' {aka 'std::__cxx11::basic_string<char>'} requested
终端错误详情：
C:\Users\jock\Documents\Arduino\c6\bluetoothtouch\bluetoothtouch.ino: In member function 'virtual void MyCallbacks::onWrite(BLECharacteristic*)':
bluetoothtouch:67:54: error: conversion from 'String' to non-scalar type 'std::string' {aka 'std::__cxx11::basic_string<char>'} requested
67 | std::string rxValue = pCharacteristic->getValue();//接收数据，并赋给rxValue
| ~~~~~~~~~~~~~~~~~~~~~~~~~^~
exit status 1
conversion from 'String' to non-scalar type 'std::string' {aka 'std::__cxx11::basic_string<char>'} requested
错误截图：
代码：
/*
使用该实例演示ESP32-C6与手机之间的数据传输，如果需要修改或使用数据，只需更改数据接收部分或数据发送部分代码
Video: https://www.youtube.com/watch?v=oCMOYS71NIU
Based on Neil Kolban example for IDF: https://github.com/nkolban/esp32-snippets/blob/master/cpp_utils/tests/BLE%20Tests/SampleNotify.cpp
Ported to Arduino ESP32 by Evandro Copercini
Create a BLE server that, once we receive a connection, will send periodic notifications.
The service advertises itself as: 6E400001-B5A3-F393-E0A9-E50E24DCCA9E
Has a characteristic of: 6E400002-B5A3-F393-E0A9-E50E24DCCA9E - used for receiving data with "WRITE"
Has a characteristic of: 6E400003-B5A3-F393-E0A9-E50E24DCCA9E - used to send data with"NOTIFY"
The design of creating the BLE server is:
1. Create a BLE Server
2. Create a BLE Service
3. Create a BLE Characteristic on the Service
4. Create a BLE Descriptor on the characteristic
5. Start the service.
6. Start advertising.
*/
/* 该示例演示了蓝牙数据透传，烧录代码，打开串口监视器，打开手机的BLE调试助手
* 1.即可看见ESP32发送的数据--见APP使用图
* 2.通过BLE调试助手的输入框可向ESP32发送数据--见APP使用图
* 该示例由BLE_uart示例更改而来
*/
#include <BLEDevice.h>
#include <BLEServer.h>
#include <BLEUtils.h>
#include <BLE2902.h>
BLEServer *pServer = NULL;
BLECharacteristic * pTxCharacteristic;
bool deviceConnected = false;
uint8_t txValue = 0;
// See the following for generating UUIDs:
// https://www.uuidgenerator.net/
#define SERVICE_UUID "6E400001-B5A3-F393-E0A9-E50E24DCCA9E" // UART service UUID
#define CHARACTERISTIC_UUID_RX "6E400002-B5A3-F393-E0A9-E50E24DCCA9E"
#define CHARACTERISTIC_UUID_TX "6E400003-B5A3-F393-E0A9-E50E24DCCA9E"
//蓝牙连接/断开处理。当有连接/断开事件发生时自动触发
class MyServerCallbacks: public BLEServerCallbacks {
void onConnect(BLEServer* pServer) { //当蓝牙连接时会执行该函数
Serial.println("蓝牙已连接");
deviceConnected = true;
};
void onDisconnect(BLEServer* pServer) {//当蓝牙断开连接时会执行该函数
Serial.println("蓝牙已断开");
deviceConnected = false;
delay(500); // give the bluetooth stack the chance to get things ready
pServer->startAdvertising(); // restart advertising
}
};
/****************数据接收部分*************/
/****************************************/
//蓝牙接收数据处理。当收到数据时自动触发
class MyCallbacks: public BLECharacteristicCallbacks {
void onWrite(BLECharacteristic *pCharacteristic) {
std::string rxValue = pCharacteristic->getValue();//接收数据，并赋给rxValue
//if(rxValue == "ON"){Serial.println("开灯");} //判断接收的字符是否为"ON"
if (rxValue.length() > 0) {
Serial.println("*********");
Serial.print("Received Value: ");
for (int i = 0; i < rxValue.length(); i++){
Serial.print(rxValue);
}
Serial.println();
Serial.println("*********");
}
}
};
/***************************************/
/****************************************/
void setup() {
Serial.begin(115200);
BLEBegin();//初始化蓝牙
}
void loop() {
/****************数据发送部分*************/
/****************************************/
if (deviceConnected) {//如果有蓝牙连接，就发送数据
pTxCharacteristic->setValue("Hello");//发送字符串
pTxCharacteristic->notify();
delay(10); // bluetooth stack will go into congestion, if too many packets are sent
pTxCharacteristic->setValue("DFRobot");//发送字符串
pTxCharacteristic->notify();
delay(10); // bluetooth stack will go into congestion, if too many packets are sent
}
/****************************************/
/****************************************/
}
void BLEBegin(){
// Create the BLE Device
BLEDevice::init(/*BLE名称*/"UART Service");
// Create the BLE Server
pServer = BLEDevice::createServer();
pServer->setCallbacks(new MyServerCallbacks());
// Create the BLE Service
BLEService *pService = pServer->createService(SERVICE_UUID);
// Create a BLE Characteristic
pTxCharacteristic = pService->createCharacteristic(
CHARACTERISTIC_UUID_TX,
BLECharacteristic::PROPERTY_NOTIFY
);
pTxCharacteristic->addDescriptor(new BLE2902());
BLECharacteristic * pRxCharacteristic = pService->createCharacteristic(
CHARACTERISTIC_UUID_RX,
BLECharacteristic::PROPERTY_WRITE
);
pRxCharacteristic->setCallbacks(new MyCallbacks());
// Start the service
pService->start();
// Start advertising
pServer->getAdvertising()->start();
Serial.println("Waiting a client connection to notify...");
}环境都合适的。
烦请大神解决下
哪个网页找到的代码？网页或者打开的路径分享一下。是不是用了基于V2 SDK的代码，C6只能用V3.0.0以上的SDK，有些函数不适配的。 YeezB 发表于 2024-5-15 10:45
哪个网页找到的代码？网页或者打开的路径分享一下。是不是用了基于V2 SDK的代码，C6只能用V3.0.0以上的SDK ...
https://wiki.dfrobot.com.cn/_SKU_DFR1075_FireBeetle_2_Board_ESP32_C6_Advanced_Tutorial#target_2
官方的 问题解决了，原因是SDK 3.0.0的底层API发生了变化。
你重新上传wiki的代码吧
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