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[bluetooth_proxy] Optimize memory usage with fixed-size array and const string references

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This commit is contained in:
J. Nick Koston
2025-08-01 14:12:08 -10:00
parent 4f58e1c8b9
commit 20959c2366
3 changed files with 19 additions and 12 deletions
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15
esphome/components/bluetooth_proxy/bluetooth_proxy.cpp
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@@ -35,8 +35,8 @@ void BluetoothProxy::setup() {
// Don't pre-allocate pool - let it grow only if needed in busy environments
// Many devices in quiet areas will never need the overflow pool
this->connections_free_response_.limit = this->connections_.size();
this->connections_free_response_.free = this->connections_.size();
this->connections_free_response_.limit = this->connection_count_;
this->connections_free_response_.free = this->connection_count_;
this->parent_->add_scanner_state_callback([this](esp32_ble_tracker::ScannerState state) {
if (this->api_connection_ != nullptr) {
@@ -134,12 +134,13 @@ void BluetoothProxy::dump_config() {
ESP_LOGCONFIG(TAG,
" Active: %s\n"
" Connections: %d",
YESNO(this->active_), this->connections_.size());
YESNO(this->active_), this->connection_count_);
}
void BluetoothProxy::loop() {
if (!api::global_api_server->is_connected() || this->api_connection_ == nullptr) {
for (auto *connection : this->connections_) {
for (uint8_t i = 0; i < this->connection_count_; i++) {
auto *connection = this->connections_[i];
if (connection->get_address() != 0 && !connection->disconnect_pending()) {
connection->disconnect();
}
@@ -162,7 +163,8 @@ esp32_ble_tracker::AdvertisementParserType BluetoothProxy::get_advertisement_par
}
BluetoothConnection *BluetoothProxy::get_connection_(uint64_t address, bool reserve) {
for (auto *connection : this->connections_) {
for (uint8_t i = 0; i < this->connection_count_; i++) {
auto *connection = this->connections_[i];
if (connection->get_address() == address)
return connection;
}
@@ -170,7 +172,8 @@ BluetoothConnection *BluetoothProxy::get_connection_(uint64_t address, bool rese
if (!reserve)
return nullptr;
for (auto *connection : this->connections_) {
for (uint8_t i = 0; i < this->connection_count_; i++) {
auto *connection = this->connections_[i];
if (connection->get_address() == 0) {
connection->send_service_ = DONE_SENDING_SERVICES;
connection->set_address(address);

12
esphome/components/bluetooth_proxy/bluetooth_proxy.h
View File

@@ -2,6 +2,7 @@
#ifdef USE_ESP32
#include <array>
#include <map>
#include <vector>
@@ -63,9 +64,11 @@ class BluetoothProxy : public esp32_ble_tracker::ESPBTDeviceListener, public Com
esp32_ble_tracker::AdvertisementParserType get_advertisement_parser_type() override;
void register_connection(BluetoothConnection *connection) {
this->connections_.push_back(connection);
if (this->connection_count_ < BLUETOOTH_PROXY_MAX_CONNECTIONS) {
this->connections_[this->connection_count_++] = connection;
connection->proxy_ = this;
}
}
void bluetooth_device_request(const api::BluetoothDeviceRequest &msg);
void bluetooth_gatt_read(const api::BluetoothGATTReadRequest &msg);
@@ -138,8 +141,8 @@ class BluetoothProxy : public esp32_ble_tracker::ESPBTDeviceListener, public Com
// Group 1: Pointers (4 bytes each, naturally aligned)
api::APIConnection *api_connection_{nullptr};
// Group 2: Container types (typically 12 bytes on 32-bit)
std::vector<BluetoothConnection *> connections_{};
// Group 2: Fixed-size array of connection pointers
std::array<BluetoothConnection *, BLUETOOTH_PROXY_MAX_CONNECTIONS> connections_{};
// BLE advertisement batching
std::vector<api::BluetoothLERawAdvertisement> advertisement_pool_;
@@ -154,7 +157,8 @@ class BluetoothProxy : public esp32_ble_tracker::ESPBTDeviceListener, public Com
// Group 4: 1-byte types grouped together
bool active_;
uint8_t advertisement_count_{0};
// 2 bytes used, 2 bytes padding
uint8_t connection_count_{0};
// 3 bytes used, 1 byte padding
};
extern BluetoothProxy *global_bluetooth_proxy; // NOLINT(cppcoreguidelines-avoid-non-const-global-variables)

2
esphome/components/esp32_ble_client/ble_client_base.h
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@@ -66,7 +66,7 @@ class BLEClientBase : public espbt::ESPBTClient, public Component {
(uint8_t) (this->address_ >> 0) & 0xff);
}
}
std::string address_str() const { return this->address_str_; }
const std::string &address_str() const { return this->address_str_; }
BLEService *get_service(espbt::ESPBTUUID uuid);
BLEService *get_service(uint16_t uuid);