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Code Issues Releases Wiki Activity

[esp32_ble_tracker] Remove unnecessary STOPPED scanner state to reduce latency

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This commit is contained in:
J. Nick Koston
2025-08-03 16:14:34 -10:00
parent 0f13af0076
commit 2e08285570
2 changed files with 34 additions and 44 deletions
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64
esphome/components/esp32_ble_tracker/esp32_ble_tracker.cpp
View File

@@ -185,9 +185,6 @@ void ESP32BLETracker::loop() {
ESP_LOGW(TAG, "Dropped %zu BLE scan results due to buffer overflow", dropped);
}
}
if (this->scanner_state_ == ScannerState::STOPPED) {
this->end_of_scan_(); // Change state to IDLE
}
if (this->scanner_state_ == ScannerState::FAILED ||
(this->scan_set_param_failed_ && this->scanner_state_ == ScannerState::RUNNING)) {
this->stop_scan_();
@@ -278,8 +275,6 @@ void ESP32BLETracker::stop_scan_() {
ESP_LOGE(TAG, "Scan is starting while trying to stop.");
} else if (this->scanner_state_ == ScannerState::STOPPING) {
ESP_LOGE(TAG, "Scan is already stopping while trying to stop.");
} else if (this->scanner_state_ == ScannerState::STOPPED) {
ESP_LOGE(TAG, "Scan is already stopped while trying to stop.");
}
return;
}
@@ -306,8 +301,6 @@ void ESP32BLETracker::start_scan_(bool first) {
ESP_LOGE(TAG, "Cannot start scan while already stopping.");
} else if (this->scanner_state_ == ScannerState::FAILED) {
ESP_LOGE(TAG, "Cannot start scan while already failed.");
} else if (this->scanner_state_ == ScannerState::STOPPED) {
ESP_LOGE(TAG, "Cannot start scan while already stopped.");
}
return;
}
@@ -342,21 +335,6 @@ void ESP32BLETracker::start_scan_(bool first) {
}
}
void ESP32BLETracker::end_of_scan_() {
// The lock must be held when calling this function.
if (this->scanner_state_ != ScannerState::STOPPED) {
ESP_LOGE(TAG, "end_of_scan_ called while scanner is not stopped.");
return;
}
ESP_LOGD(TAG, "End of scan, set scanner state to IDLE.");
this->already_discovered_.clear();
this->cancel_timeout("scan");
for (auto *listener : this->listeners_)
listener->on_scan_end();
this->set_scanner_state_(ScannerState::IDLE);
}
void ESP32BLETracker::register_client(ESPBTClient *client) {
client->app_id = ++this->app_id_;
this->clients_.push_back(client);
@@ -389,6 +367,8 @@ void ESP32BLETracker::recalculate_advertisement_parser_types() {
}
void ESP32BLETracker::gap_event_handler(esp_gap_ble_cb_event_t event, esp_ble_gap_cb_param_t *param) {
// Note: This handler is called from the main loop context, not directly from the BT task.
// The esp32_ble component queues events via enqueue_ble_event() and processes them in loop().
switch (event) {
case ESP_GAP_BLE_SCAN_PARAM_SET_COMPLETE_EVT:
this->gap_scan_set_param_complete_(param->scan_param_cmpl);
@@ -409,11 +389,13 @@ void ESP32BLETracker::gap_event_handler(esp_gap_ble_cb_event_t event, esp_ble_ga
}
void ESP32BLETracker::gap_scan_event_handler(const BLEScanResult &scan_result) {
// Note: This handler is called from the main loop context via esp32_ble's event queue.
// However, we still use a lock-free ring buffer to batch results efficiently.
ESP_LOGV(TAG, "gap_scan_result - event %d", scan_result.search_evt);
if (scan_result.search_evt == ESP_GAP_SEARCH_INQ_RES_EVT) {
// Lock-free SPSC ring buffer write (Producer side)
// This runs in the ESP-IDF Bluetooth stack callback thread
// Ring buffer write (Producer side)
// Even though we're in the main loop, the ring buffer design allows efficient batching
// IMPORTANT: Only this thread writes to ring_write_index_
// Load our own index with relaxed ordering (we're the only writer)
@@ -445,15 +427,22 @@ void ESP32BLETracker::gap_scan_event_handler(const BLEScanResult &scan_result) {
ESP_LOGE(TAG, "Scan was in failed state when scan completed.");
} else if (this->scanner_state_ == ScannerState::IDLE) {
ESP_LOGE(TAG, "Scan was idle when scan completed.");
} else if (this->scanner_state_ == ScannerState::STOPPED) {
ESP_LOGE(TAG, "Scan was stopped when scan completed.");
}
}
this->set_scanner_state_(ScannerState::STOPPED);
// Scan completed naturally, perform cleanup and transition to IDLE
ESP_LOGD(TAG, "Scan completed, set scanner state to IDLE.");
this->already_discovered_.clear();
this->cancel_timeout("scan");
for (auto *listener : this->listeners_)
listener->on_scan_end();
this->set_scanner_state_(ScannerState::IDLE);
}
}
void ESP32BLETracker::gap_scan_set_param_complete_(const esp_ble_gap_cb_param_t::ble_scan_param_cmpl_evt_param &param) {
// Called from main loop context via gap_event_handler after being queued from BT task
ESP_LOGV(TAG, "gap_scan_set_param_complete - status %d", param.status);
if (param.status == ESP_BT_STATUS_DONE) {
this->scan_set_param_failed_ = ESP_BT_STATUS_SUCCESS;
@@ -463,6 +452,7 @@ void ESP32BLETracker::gap_scan_set_param_complete_(const esp_ble_gap_cb_param_t:
}
void ESP32BLETracker::gap_scan_start_complete_(const esp_ble_gap_cb_param_t::ble_scan_start_cmpl_evt_param &param) {
// Called from main loop context via gap_event_handler after being queued from BT task
ESP_LOGV(TAG, "gap_scan_start_complete - status %d", param.status);
this->scan_start_failed_ = param.status;
if (this->scanner_state_ != ScannerState::STARTING) {
@@ -474,8 +464,6 @@ void ESP32BLETracker::gap_scan_start_complete_(const esp_ble_gap_cb_param_t::ble
ESP_LOGE(TAG, "Scan was in failed state when start complete.");
} else if (this->scanner_state_ == ScannerState::IDLE) {
ESP_LOGE(TAG, "Scan was idle when start complete.");
} else if (this->scanner_state_ == ScannerState::STOPPED) {
ESP_LOGE(TAG, "Scan was stopped when start complete.");
}
}
if (param.status == ESP_BT_STATUS_SUCCESS) {
@@ -490,6 +478,8 @@ void ESP32BLETracker::gap_scan_start_complete_(const esp_ble_gap_cb_param_t::ble
}
void ESP32BLETracker::gap_scan_stop_complete_(const esp_ble_gap_cb_param_t::ble_scan_stop_cmpl_evt_param &param) {
// Called from main loop context via gap_event_handler after being queued from BT task
// This allows us to safely transition to IDLE state and perform cleanup without race conditions
ESP_LOGV(TAG, "gap_scan_stop_complete - status %d", param.status);
if (this->scanner_state_ != ScannerState::STOPPING) {
if (this->scanner_state_ == ScannerState::RUNNING) {
@@ -500,11 +490,18 @@ void ESP32BLETracker::gap_scan_stop_complete_(const esp_ble_gap_cb_param_t::ble_
ESP_LOGE(TAG, "Scan was in failed state when stop complete.");
} else if (this->scanner_state_ == ScannerState::IDLE) {
ESP_LOGE(TAG, "Scan was idle when stop complete.");
} else if (this->scanner_state_ == ScannerState::STOPPED) {
ESP_LOGE(TAG, "Scan was stopped when stop complete.");
}
}
this->set_scanner_state_(ScannerState::STOPPED);
// Perform cleanup and transition to IDLE
ESP_LOGD(TAG, "Scan stop complete, set scanner state to IDLE.");
this->already_discovered_.clear();
this->cancel_timeout("scan");
for (auto *listener : this->listeners_)
listener->on_scan_end();
this->set_scanner_state_(ScannerState::IDLE);
}
void ESP32BLETracker::gattc_event_handler(esp_gattc_cb_event_t event, esp_gatt_if_t gattc_if,
@@ -794,9 +791,6 @@ void ESP32BLETracker::dump_config() {
case ScannerState::STOPPING:
ESP_LOGCONFIG(TAG, " Scanner State: STOPPING");
break;
case ScannerState::STOPPED:
ESP_LOGCONFIG(TAG, " Scanner State: STOPPED");
break;
case ScannerState::FAILED:
ESP_LOGCONFIG(TAG, " Scanner State: FAILED");
break;

14
esphome/components/esp32_ble_tracker/esp32_ble_tracker.h
View File

@@ -158,18 +158,16 @@ enum class ClientState : uint8_t {
};
enum class ScannerState {
// Scanner is idle, init state, set from the main loop when processing STOPPED
// Scanner is idle, init state
IDLE,
// Scanner is starting, set from the main loop only
// Scanner is starting
STARTING,
// Scanner is running, set from the ESP callback only
// Scanner is running
RUNNING,
// Scanner failed to start, set from the ESP callback only
// Scanner failed to start
FAILED,
// Scanner is stopping, set from the main loop only
// Scanner is stopping
STOPPING,
// Scanner is stopped, set from the ESP callback only
STOPPED,
};
enum class ConnectionType : uint8_t {
@@ -262,8 +260,6 @@ class ESP32BLETracker : public Component,
void stop_scan_();
/// Start a single scan by setting up the parameters and doing some esp-idf calls.
void start_scan_(bool first);
/// Called when a scan ends
void end_of_scan_();
/// Called when a `ESP_GAP_BLE_SCAN_RESULT_EVT` event is received.
void gap_scan_result_(const esp_ble_gap_cb_param_t::ble_scan_result_evt_param &param);
/// Called when a `ESP_GAP_BLE_SCAN_PARAM_SET_COMPLETE_EVT` event is received.