ESP32 BLE Server Not Visible to Scanner

In this tutorial, you'll learn about ESP32 BLE Server Not Visible to Scanner. We cover key concepts, practical examples, and best practices.

The Problem

ESP32 BLE server starts but cannot be found by phone apps or BLE scanners.

Quick Fix

Wrong

BLEServer* pServer = BLEDevice::createServer();
BLEService* pService = pServer->createService("180D");
pService->start();

ESP32 not found in any BLE scanner app. Device name does not appear.

Right

BLEDevice::init("ESP32-HeartRate");
BLEServer* pServer = BLEDevice::createServer();
BLEService* pService = pServer->createService("180D");
BLECharacteristic* pChar = pService->createCharacteristic("2A37", BLECharacteristic::PROPERTY_NOTIFY);
pChar->setValue("0");
pService->start();
BLEAdvertising* pAdv = BLEDevice::getAdvertising();
pAdv->addServiceUUID("180D");
pAdv->setScanResponse(true);
pAdv->start();

BLE server ready. Advertised as "ESP32-HeartRate" with service UUID 180D.

Prevention

Always start advertising after service starts. Add the service UUID to the advertisement. Enable scan response for phone compatibility. Set min/max preferred interval for advertising. Keep advertising running indefinitely unless connected.

DodaTech engineers apply these same patterns when building Doda Browser's networking stack, DodaZIP's firmware packaging pipeline, and Durga Antivirus Pro's sensor communication layer.

FAQ