這程式為改編，記錄使用
ESP32 藍芽SERVER端的草稿，發送雷射測距的結果，利用藍芽傳送到另一個ESP32裝置
/*
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
updated by chegewara
Create a BLE server that, once we receive a connection, will send periodic notifications.
The service advertises itself as: 4fafc201-1fb5-459e-8fcc-c5c9c331914b
And has a characteristic of: beb5483e-36e1-4688-b7f5-ea07361b26a8
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.
A connect hander associated with the server starts a background task that performs notification
every couple of seconds.
*/
#include <BLEDevice.h>
#include <BLEServer.h>
#include <BLEUtils.h>
#include <BLE2902.h>
#include <Wire.h>
#include <VL53L0X.h>//雷射測距感測器
VL53L0X sensor;//感測器命名為senser
///////////////////////////////////////////////////////////////////////////////////////////
BLEServer* pServer = NULL;
BLECharacteristic* pCharacteristic = NULL;
bool deviceConnected = false;
bool oldDeviceConnected = false;
uint32_t value = 0;
//////////////////////// 可以在下列網站生成一個專用的藍芽UUID /////////////////////////////////
// https://www.uuidgenerator.net/
/////////////////////// 定義裝置藍芽server的UUID ///////////////////////////////////////////
#define SERVICE_UUID "4fafc201-1fb5-459e-8fcc-c5c9c331914b"
////////////////////// 定義字元特徵碼 /////////////////////////////////////////////////////////
#define CHARACTERISTIC_UUID "beb5483e-36e1-4688-b7f5-ea07361b26a8"
////////////////////// 判斷目前server裝置能不能回傳值給client////////////////////////////////
//////設置布林變數deviceConnected，true表示可連線，false表示沒有連線//////////////////////////
class MyServerCallbacks: public BLEServerCallbacks {
void onConnect(BLEServer* pServer) {
deviceConnected = true;
};
void onDisconnect(BLEServer* pServer) {
deviceConnected = false;
}
};
void setup() {
Serial.begin(115200);
Wire.begin();
/////////////設定500毫秒偵測一次，如果設備啟動失敗，印出失敗//////////////////////////////
sensor.setTimeout(500);
if (!sensor.init())
{
Serial.println("Failed to detect and initialize sensor!");
while (1) {}
}
//////////////////////設定TOF為持續執行狀態//////////////////////////////////////////
sensor.startContinuous();
//////////////// 啟動藍芽裝置 初始化名稱為ESP32,可在手機中搜尋///////////////////////////
BLEDevice::init("ESP32");
/////////////// 將藍芽裝置設置為server狀態/////////////////////////////////////////////
pServer = BLEDevice::createServer();
pServer->setCallbacks(new MyServerCallbacks());
//////////////將server藍芽裝置的UUID設置為之前宣告的UUID////////////////////////////////
BLEService *pService = pServer->createService(SERVICE_UUID);
///////////// Create a BLE Characteristic (NOTIFY)可發送訊息/////////////////////////
pCharacteristic = pService->createCharacteristic(
CHARACTERISTIC_UUID,
BLECharacteristic::PROPERTY_READ |
BLECharacteristic::PROPERTY_WRITE |
BLECharacteristic::PROPERTY_NOTIFY |
BLECharacteristic::PROPERTY_INDICATE
);
// https://www.bluetooth.com/specifications/gatt/viewer?attributeXmlFile=org.bluetooth.descriptor.gatt.client_characteristic_configuration.xml
// Create a BLE Descriptor
pCharacteristic->addDescriptor(new BLE2902());
/////////////////////////////////啟動藍芽SERVER功能////////////////////////////////////////
pService->start();
//////////////////////////////開始對外廣播/////////////////////////////////////////
BLEAdvertising *pAdvertising = BLEDevice::getAdvertising();
pAdvertising->addServiceUUID(SERVICE_UUID);
pAdvertising->setScanResponse(false);
pAdvertising->setMinPreferred(0x0); // set value to 0x00 to not advertise this parameter
BLEDevice::startAdvertising();
Serial.println("Waiting a client connection to notify...");
}
void loop() {
/////////////////////////////////////////////////////////////////////////
//設定A值為測距數據
int a=sensor.readRangeContinuousMillimeters();
//設定最遠只能偵測到400mm
if (a>400){a=400;}
//轉換為CM
a=a/10;
//Serial.println(a);
//if (sensor.timeoutOccurred()) { Serial.print(" TIMEOUT"); }
////////////////////////// notify changed value 開始推送數值//////////////////////////////////////////////////
//////(uint8_t*)定義一個指標，數值0-255 &a取出a的記憶體位置，與指標共用 4為值的size/////////////////////////////
if (deviceConnected) {
pCharacteristic->setValue((uint8_t*)&a, 4);
pCharacteristic->notify();//隊有連上server的client發布a的值
delay(3); // bluetooth stack will go into congestion, if too many packets are sent, in 6 hours test i was able to go as low as 3ms
}
// disconnecting
if (!deviceConnected && oldDeviceConnected) {
delay(500); // give the bluetooth stack the chance to get things ready
pServer->startAdvertising(); // restart advertising
Serial.println("start advertising");
oldDeviceConnected = deviceConnected;
}
// connecting
if (deviceConnected && !oldDeviceConnected) {
// do stuff here on connecting
oldDeviceConnected = deviceConnected;
}
}
ESP32 藍芽CLIENT端的草稿，接收雷射測距的結果，
#include "BLEDevice.h"
//#include <WebServer.h>
//#include <WiFi.h>
/*//////////////////////////wifi_connect/////////////////////////////////////////////////
//WiFiServer server(80); //聲明伺服器對象
//WebSocketsServer webSocket();
//設定ESP32wifi的SSID
//const char *ssid = "AA";
//const char *password = "";
//int readBuff=12;
*/
//////////////////////////藍芽設定////////////////////////////////////////////////////////////////
///////////////定義想要連上藍芽SERVER的UUID，以及字元特徵，一定要和SERVER一樣才能連上////////////////////
static BLEUUID serviceUUID("4fafc201-1fb5-459e-8fcc-c5c9c331914b");
// The characteristic of the remote service we are interested in.
static BLEUUID charUUID("beb5483e-36e1-4688-b7f5-ea07361b26a8");
static boolean doConnect = false;
static boolean connected = false;
static boolean doScan = false;
static BLERemoteCharacteristic* pRemoteCharacteristic;
static BLEAdvertisedDevice* myDevice;
///////////////////////函式 接收連牙SERVER傳送過來的資料/////////////////////////////////////////////////////////////
static void notifyCallback(
BLERemoteCharacteristic* pBLERemoteCharacteristic,
//宣告pData指標，型別為uint8_t,須和SERVER一樣，pData為記憶體位置，裡面要放置為SERVER傳過來的值
uint8_t* pData,
size_t length,
//判斷有沒有傳送值到本地
bool isNotify) {
//上述 bool為TRUE，將值放置到pDatat記憶體位置
//指派distance為測距結果(*pData 為pData記憶體位置裡面的資料)
//取出pData記憶體位置裡面的資料，指派給distance
int distance=*pData;
Serial.println(distance);
}
class MyClientCallback : public BLEClientCallbacks {
void onConnect(BLEClient* pclient) {
}
void onDisconnect(BLEClient* pclient) {
connected = false;
}
};
//////////////////////////////布林函式 判斷有沒有連上藍芽SERVER/////////////////////////////////////////////
bool connectToServer() {
BLEClient* pClient = BLEDevice::createClient();
pClient->setClientCallbacks(new MyClientCallback());
// Connect to the remove BLE Server.
pClient->connect(myDevice); // if you pass BLEAdvertisedDevice instead of address, it will be recognized type of peer device address (public or private)
// Obtain a reference to the service we are after in the remote BLE server.
BLERemoteService* pRemoteService = pClient->getService(serviceUUID);
if (pRemoteService == nullptr) {
pClient->disconnect();
return false;
}
// Obtain a reference to the characteristic in the service of the remote BLE server.
pRemoteCharacteristic = pRemoteService->getCharacteristic(charUUID);
if (pRemoteCharacteristic == nullptr) {
pClient->disconnect();
return false;
}
// Read the value of the characteristic.
if(pRemoteCharacteristic->canRead()) {
std::string value = pRemoteCharacteristic->readValue();
}
if(pRemoteCharacteristic->canNotify())
pRemoteCharacteristic->registerForNotify(notifyCallback);
connected = true;
}
/**
* Scan for BLE servers and find the first one that advertises the service we are looking for.
*/
class MyAdvertisedDeviceCallbacks: public BLEAdvertisedDeviceCallbacks {
/**
* Called for each advertising BLE server.
*/
void onResult(BLEAdvertisedDevice advertisedDevice) {
// We have found a device, let us now see if it contains the service we are looking for.
if (advertisedDevice.haveServiceUUID() && advertisedDevice.isAdvertisingService(serviceUUID)) {
BLEDevice::getScan()->stop();
myDevice = new BLEAdvertisedDevice(advertisedDevice);
doConnect = true;
doScan = true;
} // Found our server
} // onResult
}; // MyAdvertisedDeviceCallbacks
void setup() {
Serial.begin(115200);
/* /////////////////////////////////////wifi設定//////////////////////////////////////////////////////////
WiFi.mode(WIFI_AP_STA); //wifi模式 AP STA雙模
WiFi.softAP(ssid); //命名WIFIAP的SSID名稱
//AP的預設IP為 192.168.4.1
IPAddress myIP = WiFi.softAPIP();
server.begin(22333);
*/
/////////////////////////////////////藍芽設定/////////////////////////////////////////////////////////
//本地藍芽設備名稱，不想被搜尋就為空
BLEDevice::init("");
// Retrieve a Scanner and set the callback we want to use to be informed when we
// have detected a new device. Specify that we want active scanning and start the
// scan to run for 5 seconds.
BLEScan* pBLEScan = BLEDevice::getScan();
pBLEScan->setAdvertisedDeviceCallbacks(new MyAdvertisedDeviceCallbacks());
pBLEScan->setInterval(1349);
pBLEScan->setWindow(449);
pBLEScan->setActiveScan(true);
pBLEScan->start(5, false);
} // End of setup.
// This is the Arduino main loop function.
void loop() {
// If the flag "doConnect" is true then we have scanned for and found the desired
// BLE Server with which we wish to connect. Now we connect to it. Once we are
// connected we set the connected flag to be true.
if (doConnect == true) {
if (connectToServer()) {
Serial.println("We are now connected to the BLE Server.");
} else {
Serial.println("We have failed to connect to the server; there is nothin more we will do.");
}
doConnect = false;
}
// If we are connected to a peer BLE Server, update the characteristic each time we are reached
// with the current time since boot.
if (connected) {
}else if(doScan){
BLEDevice::getScan()->start(0); // this is just eample to start scan after disconnect, most likely there is better way to do it in arduino
}
delay(1000); // Delay a second between loops.
}
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