Arduino core for ESP32 Wiki content

Initialize Bluetooth Serial and BLE server

If both BLE and Bluetooth are required to operate in the code, the initialization sequence seems to be critical.

Complete initialization of a BLE server and then separate initialization of Bluetooth Serial didn’t work. The correct sequence seems to be

Init BLE device => BLEDevice::init(apName);
Init Bluetooth Serial => SerialBT.begin(apName);
Then do the rest of the BLE initialisation like
- create server
- add callbacks to server
- add characteristics
- start server
- start advertising

Here is a code extract that worked for me

void initBlueTooth() {
  // Initialize BLE


  // Create BLE Server
  pServer = BLEDevice::createServer();

// ...
// initialize BLE callbacks and characteristics
// ...

  // Start the service

  // Start advertising
  pAdvertising = pServer->getAdvertising();


Full code example for the initialization can be found in this Github repo.