arduino ESP32 AndroidStudio BLE低功耗蓝牙 物联网

登山则情满于山,观海则意溢于海。这篇文章主要讲述arduino ESP32 AndroidStudio BLE低功耗蓝牙 物联网相关的知识,希望能为你提供帮助。
 
                  arduino ESP32 androidStudio BLE低功耗蓝牙 物联网参考路径:    https://blog.csdn.net/qq_35174914/article/details/79328125
nodered开发:
1.    node red sample节点前后端数据传送
2.      node red 代码编辑块传到后台
 
  esp32采用的蓝牙于普通的蓝牙不同,是低功耗蓝牙,手机用一般的蓝牙代码是连不上的。在本文中,不讨论有关低功耗蓝牙的内容,只说明如何实现ESP32与 Android手机间通过低功耗蓝牙进行相互通信。
    进入这个仓库    https://github.com/nkolban/ESP32_BLE_Arduino  打包下载所有文件
 
将内容解压后复制Arduino安装目录下的Libraries文件夹下
 
注意不要产生多级目录
 
 
然后是Arduino代码
#include < BLEDevice.h>
#include < BLEServer.h>
#include < BLEUtils.h>
#include < BLE2902.h>
#include < String.h>

BLECharacteristic *pCharacteristic;
bool deviceConnected = false;
uint8_t txValue = https://www.songbingjia.com/android/0;
long lastMsg = 0; //存放时间的变量
String rxload="BlackWalnutLabs";

#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"

class MyServerCallbacks: public BLEServerCallbacks {
void onConnect(BLEServer* pServer) {
deviceConnected = true;
};
void onDisconnect(BLEServer* pServer) {
deviceConnected = false;
}
};

class MyCallbacks: public BLECharacteristicCallbacks {
void onWrite(BLECharacteristic *pCharacteristic) {
std::string rxValue = https://www.songbingjia.com/android/pCharacteristic-> getValue();
if (rxValue.length() > 0) {
rxload="";
for (int i = 0; i < rxValue.length(); i++)
{
rxload +=(char)rxValue[i];
Serial.print(rxValue[i]);
}
Serial.println("");
}
}
};

void setupBLE(String BLEName){
const char *ble_name=BLEName.c_str();
BLEDevice::init(ble_name);
BLEServer *pServer = BLEDevice::createServer();
pServer-> setCallbacks(new MyServerCallbacks());
BLEService *pService = pServer-> createService(SERVICE_UUID);
pCharacteristic = pService-> createCharacteristic(CHARACTERISTIC_UUID_TX,BLECharacteristic::PROPERTY_NOTIFY);
pCharacteristic-> addDescriptor(new BLE2902());
BLECharacteristic *pCharacteristic = pService-> createCharacteristic(CHARACTERISTIC_UUID_RX,BLECharacteristic::PROPERTY_WRITE);
pCharacteristic-> setCallbacks(new MyCallbacks());
pService-> start();
pServer-> getAdvertising()-> start();
Serial.println("Waiting a client connection to notify...");
}


void setup() {
Serial.begin(115200);
setupBLE("BlackWalnutLabs"); //设置蓝牙名称
}

void loop() {
long now = millis(); //记录当前时间
if (now - lastMsg > 1000)
{//每隔1秒发一次信号
if (deviceConnected& & rxload.length()> 0) {
String str=rxload;
const char *newValue=https://www.songbingjia.com/android/str.c_str();
pCharacteristic-> setValue(newValue);
pCharacteristic-> notify();
}
lastMsg = now; //刷新上一次发送数据的时间
}

}
上传到ESP32上以后 进入APP搜索设备,连接设备
 
直接使用即可
附上AndroidStudio的代码  https://pan.baidu.com/s/1ht9OwSW    y51b
或者用C币的。。。恩 http://download.csdn.net/download/qq_35174914/10252124
【arduino ESP32 AndroidStudio BLE低功耗蓝牙 物联网】
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原文链接:https://blog.csdn.net/qq_35174914/article/details/79328125

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