用ESP32测量蓝牙连接力答案

【问题标题】：Measuring bluetooth connection force with ESP32用ESP32测量蓝牙连接力
【发布时间】：2019-06-01 07:26:13
【问题描述】：

如何测量 ESP32 的蓝牙连接力？我正在使用 BLE 的可用示例来检测连接的可能性，但我需要测量它的强度。谢谢。

我正在使用：

#include <BLEDevice.h>
#include <BLEUtils.h>
#include <BLEScan.h>
#include <BLEAdvertisedDevice.h>

int scanTime = 30; //In seconds

class MyAdvertisedDeviceCallbacks: public BLEAdvertisedDeviceCallbacks {
    void onResult(BLEAdvertisedDevice advertisedDevice) {
      Serial.printf("Advertised Device: %s \n", advertisedDevice.toString().c_str());
    }
};

void setup() {
  Serial.begin(115200);
  Serial.println("Scanning...");

  BLEDevice::init("");
  BLEScan* pBLEScan = BLEDevice::getScan(); //create new scan
  pBLEScan->setAdvertisedDeviceCallbacks(new MyAdvertisedDeviceCallbacks());
  pBLEScan->setActiveScan(true); //active scan uses more power, but get results faster
  BLEScanResults foundDevices = pBLEScan->start(scanTime);
  Serial.print("Devices found: ");
  Serial.println(foundDevices.getCount());
  Serial.println("Scan done!");
}

void loop() {
  // put your main code here, to run repeatedly:
  delay(2000);
}`

【问题讨论】：

标签： bluetooth arduino bluetooth-lowenergy esp32

【解决方案1】：

只需向您的 MyAdvertisedDeviceCallbacks 添加几行：public BLEAdvertisedDeviceCallbacks：

class MyAdvertisedDeviceCallbacks: public BLEAdvertisedDeviceCallbacks {
    void onResult(BLEAdvertisedDevice advertisedDevice) {
      Serial.printf("Advertised Device: %s \n", advertisedDevice.toString().c_str
      int rssi = advertisedDevice.getRSSI();
      Serial.print("Rssi: ");
      Serial.println(rssi);
    }
};

【讨论】：

【解决方案2】：

在wifi中我正在使用这个功能：

// Take a number of measurements of the WiFi strength and return the average result.
int getStrength(int points){
  long rssi = 0;
  long averageRSSI=0;

  for (int i=0;i < points;i++){
    rssi += WiFi.RSSI(); // put your BLE function here
    delay(20);
  }

  averageRSSI=rssi/points;
  return averageRSSI;
}

你的 BLE 功能与 WiFi.RSSI() 相同：（参见 github 源代码）

int BLEAdvertisedDevice::getRSSI() {
   return m_rssi;
} // getRSSI

【讨论】：