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Code Issues Releases Wiki Activity

[esp32_ble_tracker] Eliminate redundant ring buffer for lower latency (#10057)

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Co-authored-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com>
This commit is contained in:
J. Nick Koston
2025-08-04 15:10:32 -10:00
committed by GitHub
parent fa8c5e880c
commit f7bf1ef52c
3 changed files with 84 additions and 119 deletions
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18
esphome/components/esp32_ble_tracker/esp32_ble_tracker.h
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@@ -6,7 +6,6 @@
#include "esphome/core/helpers.h"
#include <array>
#include <atomic>
#include <string>
#include <vector>
@@ -21,6 +20,7 @@
#include "esphome/components/esp32_ble/ble.h"
#include "esphome/components/esp32_ble/ble_uuid.h"
#include "esphome/components/esp32_ble/ble_scan_result.h"
namespace esphome::esp32_ble_tracker {
@@ -272,6 +272,13 @@ class ESP32BLETracker : public Component,
void set_scanner_state_(ScannerState state);
/// Common cleanup logic when transitioning scanner to IDLE state
void cleanup_scan_state_(bool is_stop_complete);
/// Process a single scan result immediately
/// Returns true if a discovered client needs promotion to READY_TO_CONNECT
bool process_scan_result_(const BLEScanResult &scan_result);
#ifdef USE_ESP32_BLE_DEVICE
/// Check if any clients are in connecting or ready to connect state
bool has_connecting_clients_() const;
#endif
uint8_t app_id_{0};
@@ -295,15 +302,6 @@ class ESP32BLETracker : public Component,
bool raw_advertisements_{false};
bool parse_advertisements_{false};
// Lock-free Single-Producer Single-Consumer (SPSC) ring buffer for scan results
// Producer: ESP-IDF Bluetooth stack callback (gap_scan_event_handler)
// Consumer: ESPHome main loop (loop() method)
// This design ensures zero blocking in the BT callback and prevents scan result loss
BLEScanResult *scan_ring_buffer_;
std::atomic<uint8_t> ring_write_index_{0}; // Written only by BT callback (producer)
std::atomic<uint8_t> ring_read_index_{0}; // Written only by main loop (consumer)
std::atomic<uint16_t> scan_results_dropped_{0}; // Tracks buffer overflow events
esp_bt_status_t scan_start_failed_{ESP_BT_STATUS_SUCCESS};
esp_bt_status_t scan_set_param_failed_{ESP_BT_STATUS_SUCCESS};
int connecting_{0};