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feat: migrate BLE to NimBLE — 45% flash, 33% RAM reduction

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- Replaced ESP32 BLE Arduino with h2zero/NimBLE-Arduino@^2
- -DCONFIG_BT_NIMBLE_ENABLED to disable built-in Bluedroid
- NIMBLE_PROPERTY::* replaces BLECharacteristic::PROPERTY_* + setAccessPermissions
- BLE2902 descriptor removed (NimBLE auto-creates it)
- pService->start() removed (NimBLE starts services with server)
- setMinPreferred → setMinInterval/setMaxInterval
- onConnect/onDisconnect/onWrite get extra NimBLEConnInfo& param
- Re-advertise: BLEDevice → NimBLEDevice::startAdvertising()
- Firmware: 533KB flash (was 964KB), 29KB RAM (was 44KB)
This commit is contained in:
eddy 2026-07-29 18:58:49 +02:00
commit 96d3620535
3 changed files with 21 additions and 25 deletions
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44
src/main.cpp
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@ -1,8 +1,5 @@
#include <Arduino.h>
#include <BLEDevice.h>
#include <BLEServer.h>
#include <BLEUtils.h>
#include <BLE2902.h>
#include <NimBLEDevice.h>
#include <mbedtls/md.h>
#include <Preferences.h>
@ -25,7 +22,7 @@
#define NVS_KEY_NAME "key"
#define NVS_UUID_NAME "uuid"
BLECharacteristic *pCharacteristic;
NimBLECharacteristic *pCharacteristic;
bool deviceConnected = false;
bool bleRelay1 = false;
bool bleRelay2 = false;
@ -39,19 +36,19 @@ bool keyProvisioned = false;
bool uuidProvisioned = false;
Preferences preferences;
class MyServerCallbacks : public BLEServerCallbacks {
void onConnect(BLEServer *pServer) override {
class MyServerCallbacks : public NimBLEServerCallbacks {
void onConnect(NimBLEServer *pServer, NimBLEConnInfo &connInfo) override {
deviceConnected = true;
lastSeq = 0;
Serial.println("BLE: device connected");
}
void onDisconnect(BLEServer *pServer) override {
void onDisconnect(NimBLEServer *pServer, NimBLEConnInfo &connInfo, int reason) override {
deviceConnected = false;
bleRelay1 = false;
bleRelay2 = false;
lastSeq = 0;
Serial.println("BLE: device disconnected");
BLEDevice::startAdvertising();
NimBLEDevice::startAdvertising();
}
};
@ -101,8 +98,8 @@ static void parseHexKey(const String &hex, uint8_t *out) {
}
}
class MyCharacteristicCallbacks : public BLECharacteristicCallbacks {
void onWrite(BLECharacteristic *pChar) override {
class MyCharacteristicCallbacks : public NimBLECharacteristicCallbacks {
void onWrite(NimBLECharacteristic *pChar, NimBLEConnInfo &connInfo) override {
std::string value = pChar->getValue();
if (value.length() != HMAC_PKT_SIZE) {
Serial.printf("BLE: bad packet length %d (expected %d)\n",
@ -185,34 +182,31 @@ void setup() {
}
Serial.println("LED blink done, starting BLE...");
BLEDevice::init("SylDa_Server");
NimBLEDevice::init("SylDa_Server");
BLEServer *pServer = BLEDevice::createServer();
NimBLEServer *pServer = NimBLEDevice::createServer();
pServer->setCallbacks(new MyServerCallbacks());
BLEService *pService = pServer->createService(SERVICE_UUID);
NimBLEService *pService = pServer->createService(SERVICE_UUID);
pCharacteristic = pService->createCharacteristic(
CHARACTERISTIC_UUID,
BLECharacteristic::PROPERTY_WRITE_NR | BLECharacteristic::PROPERTY_NOTIFY
NIMBLE_PROPERTY::WRITE_NR | NIMBLE_PROPERTY::NOTIFY
);
pCharacteristic->setAccessPermissions(ESP_GATT_PERM_WRITE);
pCharacteristic->addDescriptor(new BLE2902());
pCharacteristic->setCallbacks(new MyCharacteristicCallbacks());
pCharacteristic->setValue("0");
pService->start();
BLECharacteristic *pUuidChar = pService->createCharacteristic(
NimBLECharacteristic *pUuidChar = pService->createCharacteristic(
UUID_CHAR_UUID,
BLECharacteristic::PROPERTY_READ
NIMBLE_PROPERTY::READ
);
pUuidChar->setValue(deviceUuid, ESP_UUID_LEN);
BLEAdvertising *pAdvertising = BLEDevice::getAdvertising();
NimBLEAdvertising *pAdvertising = NimBLEDevice::getAdvertising();
pAdvertising->addServiceUUID(SERVICE_UUID);
pAdvertising->setScanResponse(true);
pAdvertising->setMinPreferred(0x06);
pAdvertising->setMinPreferred(0x12);
BLEDevice::startAdvertising();
pAdvertising->enableScanResponse(true);
pAdvertising->setMinInterval(32);
pAdvertising->setMaxInterval(64);
NimBLEDevice::startAdvertising();
Serial.println("BLE: advertising started as 'SylDa_Server'");