NimBLE_Secure_Server.ino

/**
 * NimBLE_Secure_Server Demo:
 *
 * This example demonstrates the secure passkey protected conenction and communication between an esp32 server and an
 * esp32 client. Please note that esp32 stores auth info in nvs memory. After a successful connection it is possible
 * that a passkey change will be ineffective. To avoid this clear the memory of the esp32's between security testings.
 * esptool.py is capable of this, example: esptool.py --port /dev/ttyUSB0 erase_flash.
 *
 *  Created: on Jan 08 2021
 *      Author: mblasee
 */

#include <Arduino.h>
#include <NimBLEDevice.h>

void setup() {
    Serial.begin(115200);
    Serial.println("Starting NimBLE Server");
    NimBLEDevice::init("NimBLE");
    NimBLEDevice::setPower(3); /** +3db */

    NimBLEDevice::setSecurityAuth(true, true, false); /** bonding, MITM, don't need BLE secure connections as we are using passkey pairing */
    NimBLEDevice::setSecurityPasskey(123456);
    NimBLEDevice::setSecurityIOCap(BLE_HS_IO_DISPLAY_ONLY); /** Display only passkey */
    NimBLEServer*         pServer                  = NimBLEDevice::createServer();
    NimBLEService*        pService                 = pServer->createService("ABCD");
    NimBLECharacteristic* pNonSecureCharacteristic = pService->createCharacteristic("1234", NIMBLE_PROPERTY::READ);
    NimBLECharacteristic* pSecureCharacteristic =
        pService->createCharacteristic("1235",
                                       NIMBLE_PROPERTY::READ | NIMBLE_PROPERTY::READ_ENC | NIMBLE_PROPERTY::READ_AUTHEN);

    pService->start();
    pNonSecureCharacteristic->setValue("Hello Non Secure BLE");
    pSecureCharacteristic->setValue("Hello Secure BLE");

    NimBLEAdvertising* pAdvertising = NimBLEDevice::getAdvertising();
    pAdvertising->addServiceUUID("ABCD");
    pAdvertising->start();
}

void loop() {}