Q_NErk

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• ESP32 as reader to Bangle.js

  @Q_NErk started

  • 9 comments
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  @fanoush replied
• ESP32 as reader to Bangle.js

  in Bangle.js • 1 year, 8 months

  

  I'm not a bot (I know, all bot can say it :))
  I'm not familiar with JS, that why I'm trying to solve it anyhow by (like You said) c in Arduino envoirment. This is my first tries with BT/BLE.

• ESP32 as reader to Bangle.js

  in Bangle.js • 1 year, 8 months

  

  Hello,
  I passed it this way. I have installed btadv for begining and after this I've tried to set esp32 bluetooth client:

  /**
   * A BLE client example that is rich in capabilities.
   * There is a lot new capabilities implemented.
   * author unknown
   * updated by chegewara
   */
  
  [#include](https://forum.espruino.com/se­arch/?q=%23include) "BLEDevice.h"
  //#include "BLEScan.h"
  
  // The remote service we wish to connect to.
  static BLEUUID serviceUUID("0000180d-0000-1000-8000-008­05f9b34fb");
  // The characteristic of the remote service we are interested in.
  static BLEUUID    charUUID("0000180d-0000-1000-8000-00805f­9b34fb");
  
  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) {
      Serial.print("Notify callback for characteristic ");
      Serial.print(pBLERemoteCharacteristic->g­etUUID().toString().c_str());
      Serial.print(" of data length ");
      Serial.println(length);
      Serial.print("data: ");
      Serial.println((char*)pData);
  }
  
  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 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)
      Serial.println(" - Connected to server");
      pClient->setMTU(517); //set client to request maximum MTU from server (default is 23 otherwise)
    
      // 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;
      return 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 = "Time since boot: " + String(millis()/1000);
      Serial.println("Setting new characteristic value to \"" + newValue + "\"");
      
      // Set the characteristic's value to be the array of bytes that is actually a string.
      pRemoteCharacteristic->writeValue(newVal­ue.c_str(), newValue.length());
    }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(1000); // Delay a second between loops.
  } // End of loop
  

  And I'm receiving:

  BLE Advertised Device found: Name: Bangle.js e4e1, Address: f0:40:5d:1d:e4:e1, serviceUUID: 0000180d-0000-1000-8000-00805f9b34fb, serviceUUID: 0000181a-0000-1000-8000-00805f9b34fb, serviceUUID: 00001819-0000-1000-8000-00805f9b34fb
  Forming a connection to f0:40:5d:1d:e4:e1
   - Created client
   - Connected to server
   - Found our service
  Failed to find our characteristic UUID: 0000180d-0000-1000-8000-00805f9b34fb
  We have failed to connect to the server; there is nothin more we will do.
  onDisconnect
  
  

  What I'm doing wrong?

• ESP32 as reader to Bangle.js

  in Bangle.js • 1 year, 8 months

  

  It can be peer to peer or it can be brodacasted by bangle.js via BT. Yes, ESP32 will collect data. The best will be from multiple Bangle.js

• ESP32 as reader to Bangle.js

  in Bangle.js • 1 year, 8 months

  

  Hello,
  I have one question: how to read values from bangle.js by device like esp32? I want to use it for my project will external display values from wristband.
  I guess that it will be needed to connect to specified bangle.js and then somehow use data similar way to js.

  BR
  QNerk