getName returns empty string

[rodneygmorgan]

What am I missing or doing wrong?

--- More details at https://bit.ly/pio-monitor-filters --- Quit: Ctrl+C | Menu: Ctrl+T | Help: Ctrl+T followed by Ctrl+H Found 8 devices Connected to Length of getName() : 0 Found our UUID : 4fafc201-1fb5-459e-8fcc-c5c9c331914b

BLE server code========= #include <Arduino.h> #include "NimBLEDevice.h"

NimBLEServer *pServer;

// void setup() void setup(void) { Serial.begin(115200); Serial.println("Starting NimBLE Server");

NimBLEDevice::init("Ranger Beacon");

// Create Server
pServer = NimBLEDevice::createServer();

// Create Service
NimBLEService* pService = pServer->createService("4fafc201-1fb5-459e-8fcc-c5c9c331914b");

// Create Characteristic
NimBLECharacteristic* pCharacteristic = pService->createCharacteristic("beb5483e-36e1-4688-b7f5-ea07361b26a8");

NimBLEDescriptor* pDscr = pCharacteristic->createDescriptor("Ranger",NIMBLE_PROPERTY::READ | NIMBLE_PROPERTY::WRITE,20);
pDscr->setValue("at Barn");

// Start the service
pService->start();

// Set Characteristic value
pCharacteristic->setValue("Barn");

NimBLEAdvertising* pAdvertising = NimBLEDevice::getAdvertising();
pAdvertising->addServiceUUID(pService->getUUID()); 

// Start advertising
pAdvertising->setScanResponse(true);
pAdvertising->start(); 

Serial.println("Advertising Started");

}

void loop() { delay(2000); Serial.print("."); }

BLE Client code================= #include "NimBLEDevice.h" #include <Arduino.h>

void setup() { char foo[48]; Serial.begin(115200); Serial.println("Starting NimBLE Client");

NimBLEDevice::init("");

NimBLEScan *pScan = NimBLEDevice::getScan(); NimBLEScanResults results = pScan->start(10);

NimBLEUUID serviceUuid("4fafc201-1fb5-459e-8fcc-c5c9c331914b");

Serial.printf("Found %i devices\n",results.getCount()); for(int i = 0; i < results.getCount(); i++) { NimBLEAdvertisedDevice device = results.getDevice(i);

if (device.isAdvertisingService(serviceUuid)) {
  Serial.printf("Connected to %s\n",device.getName().c_str());
  Serial.printf("Length of getName() : %i\n",strlen(device.getName().c_str()));
  Serial.printf("Found our UUID : %s\n",device.getServiceUUID().toString().c_str());
  NimBLEClient *pClient = NimBLEDevice::createClient();
      
  if (pClient->connect(&device)) {
    NimBLERemoteService *pService = pClient->getService(serviceUuid);
            
    if (pService != nullptr) {
      NimBLERemoteCharacteristic *pCharacteristic = pService->getCharacteristic("beb5483e-36e1-4688-b7f5-ea07361b26a8");
                
      if (pCharacteristic != nullptr) {
        std::string value = pCharacteristic->readValue();
        //Serial.printf("Characteristic value %s\n",value);
        // print or do whatever you need with the value
      }
    }
  } else {
  // failed to connect
  }
        
  NimBLEDevice::deleteClient(pClient);
}

} }

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

[h2zero]

The device may not be advertising it's name so there is no data.

[rodneygmorgan]

I based the server code off the new user guide and included that code in my request for help. The documentation indicates the value specified in the init() command is used as the device name. Is there a different place/method I should use to supply an "advertised" name? Thanks for the quick reply.

On Wed, Jun 28, 2023 at 9:44 PM h2zero @.***> wrote:

The device may not be advertising it's name so there is no data.

— Reply to this email directly, view it on GitHub https://github.com/h2zero/NimBLE-Arduino/issues/559#issuecomment-1612390069, or unsubscribe https://github.com/notifications/unsubscribe-auth/AOOIJVJMLZHMOQY5FRRE7W3XNT227ANCNFSM6AAAAAAZXRU4HQ . You are receiving this because you authored the thread.Message ID: @.***>

[h2zero]

Yes you need to set the name in the advertisement, the device name in init only sets the name value for the characteristic.