ESP32 Forum

Posted: **Wed May 18, 2022 6:10 pm**

This is a code to use with Jinou Beacon sensor. Its working but has a lot to do, i need some help to work with multiple beacons. I think its needed to use this:

Code: [Select all] [Expand/Collapse]

#include "BLEDevice.h"
 
// The remote service we wish to connect to.
static BLEUUID serviceUUID("0000AA20");
// The characteristic of the remote service we are interested in.
static BLEUUID    charUUID("0000AA21");
 
static boolean doConnect = false;
static boolean connected = false;
static boolean doScan = false;
static BLERemoteCharacteristic* pRemoteCharacteristic;
static BLEAdvertisedDevice* myDevice;
 
static void notifyCallback(
  BLERemoteCharacteristic* pBLERemoteCharacteristic,
  uint8_t* pData,
  size_t length,
  bool isNotify) {   
}
 
class MyClientCallback : public BLEClientCallbacks {
  void onConnect(BLEClient* pclient) {
  }
 
  void onDisconnect(BLEClient* pclient) {
    connected = false;
    Serial.println("onDisconnect");
  }
};
 
bool connectToServer() {
    Serial.print("Forming a connection to ");
    Serial.println(myDevice->getAddress().toString().c_str());
    
    BLEClient*  pClient  = BLEDevice::createClient();
    Serial.println(" - Created client");
 
    pClient->setClientCallbacks(new MyClientCallback());
 
    // Connect to the remote BLE Server.
    pClient->connect(myDevice);  // if you pass BLEAdvertisedDevice instead of address, it will be recognized type of peer device address (public or private)
    Serial.println(" - Connected to server");
 
    // Obtain a reference to the service we are after in the remote BLE server.
    BLERemoteService* pRemoteService = pClient->getService(serviceUUID);
    if (pRemoteService == nullptr) {
      Serial.print("Failed to find our service UUID: ");
      Serial.println(serviceUUID.toString().c_str());
      pClient->disconnect();
      return false;
    }
    Serial.println(" - Found our service");
 
 
    // Obtain a reference to the characteristic in the service of the remote BLE server.
    pRemoteCharacteristic = pRemoteService->getCharacteristic(charUUID);
    if (pRemoteCharacteristic == nullptr) {
      Serial.print("Failed to find our characteristic UUID: ");
      Serial.println(charUUID.toString().c_str());
      pClient->disconnect();
      return false;
    }
    Serial.println(" - Found our characteristic");
 
    // Read the value of the characteristic.
    if(pRemoteCharacteristic->canRead()) {
      std::string value = pRemoteCharacteristic->readValue();
      Serial.print("The characteristic value was: ");
      Serial.println(value.c_str());
    }
 
    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) {
    Serial.print("BLE Advertised Device found: ");
    Serial.println(advertisedDevice.toString().c_str());
 
    // 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);
  Serial.println("Starting Arduino BLE Client application...");
  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) {
    String newValue = "Canopus: " + String(millis()/1000);
    pRemoteCharacteristic->writeValue(newValue.c_str(), newValue.length());
    Serial.print("\r\n - Result sensor");
    std::string value = pRemoteCharacteristic->readValue(); 
    Serial.printf("\r\nLength : %d\r\n", value.length()); 
    Serial.print(" 0x"); Serial.print((uint8_t)value[0], HEX); 
    Serial.print(" 0x"); Serial.print((uint8_t)value[1], HEX);
    Serial.print(" 0x"); Serial.print((uint8_t)value[2], HEX);
    Serial.print(" 0x"); Serial.print((uint8_t)value[3], HEX);
    Serial.print(" 0x"); Serial.print((uint8_t)value[4], HEX);
    Serial.print(" 0x"); Serial.print((uint8_t)value[5], HEX);
 
    float temp = value[1]*100+value[2];
    if(value[1]==1)
    {
      temp=temp*-1;
    }
    Serial.printf("\r\nTemp: %.02f*C", temp/100); 
    float humi = value[4]*100+value[5];
    Serial.printf("\r\nHumi: %.02f/%", humi/100); 
                  
  }else if(doScan){
    BLEDevice::getScan()->start(0);  // this is just example to start scan after disconnect, most likely there is better way to do it in arduino
  }
  
  delay(3000); // Delay a second between loops.
} // End of loop

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