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[esp32_ble_tracker] Fix false reboots when event loop is blocked (#10144)

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This commit is contained in:
J. Nick Koston
2025-08-10 04:44:23 -05:00
committed by GitHub
parent 2b9e1ce315
commit cef39e7c59
2 changed files with 48 additions and 7 deletions
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47
esphome/components/esp32_ble_tracker/esp32_ble_tracker.cpp
View File

@@ -101,6 +101,38 @@ void ESP32BLETracker::loop() {
this->start_scan();
}
}
// Check for scan timeout - moved here from scheduler to avoid false reboots
// when the loop is blocked
if (this->scanner_state_ == ScannerState::RUNNING) {
switch (this->scan_timeout_state_) {
case ScanTimeoutState::MONITORING: {
uint32_t now = App.get_loop_component_start_time();
uint32_t timeout_ms = this->scan_duration_ * 2000;
// Robust time comparison that handles rollover correctly
// This works because unsigned arithmetic wraps around predictably
if ((now - this->scan_start_time_) > timeout_ms) {
// First time we've seen the timeout exceeded - wait one more loop iteration
// This ensures all components have had a chance to process pending events
// This is because esp32_ble may not have run yet and called
// gap_scan_event_handler yet when the loop unblocks
ESP_LOGW(TAG, "Scan timeout exceeded");
this->scan_timeout_state_ = ScanTimeoutState::EXCEEDED_WAIT;
}
break;
}
case ScanTimeoutState::EXCEEDED_WAIT:
// We've waited at least one full loop iteration, and scan is still running
ESP_LOGE(TAG, "Scan never terminated, rebooting");
App.reboot();
break;
case ScanTimeoutState::INACTIVE:
// This case should be unreachable - scanner and timeout states are always synchronized
break;
}
}
ClientStateCounts counts = this->count_client_states_();
if (counts != this->client_state_counts_) {
this->client_state_counts_ = counts;
@@ -164,7 +196,8 @@ void ESP32BLETracker::stop_scan_() {
ESP_LOGE(TAG, "Cannot stop scan: %s", this->scanner_state_to_string_(this->scanner_state_));
return;
}
this->cancel_timeout("scan");
// Reset timeout state machine when stopping scan
this->scan_timeout_state_ = ScanTimeoutState::INACTIVE;
this->set_scanner_state_(ScannerState::STOPPING);
esp_err_t err = esp_ble_gap_stop_scanning();
if (err != ESP_OK) {
@@ -197,11 +230,10 @@ void ESP32BLETracker::start_scan_(bool first) {
this->scan_params_.scan_interval = this->scan_interval_;
this->scan_params_.scan_window = this->scan_window_;
// Start timeout before scan is started. Otherwise scan never starts if any error.
this->set_timeout("scan", this->scan_duration_ * 2000, []() {
ESP_LOGE(TAG, "Scan never terminated, rebooting to restore stack (IDF)");
App.reboot();
});
// Start timeout monitoring in loop() instead of using scheduler
// This prevents false reboots when the loop is blocked
this->scan_start_time_ = App.get_loop_component_start_time();
this->scan_timeout_state_ = ScanTimeoutState::MONITORING;
esp_err_t err = esp_ble_gap_set_scan_params(&this->scan_params_);
if (err != ESP_OK) {
@@ -752,7 +784,8 @@ void ESP32BLETracker::cleanup_scan_state_(bool is_stop_complete) {
#ifdef USE_ESP32_BLE_DEVICE
this->already_discovered_.clear();
#endif
this->cancel_timeout("scan");
// Reset timeout state machine instead of cancelling scheduler timeout
this->scan_timeout_state_ = ScanTimeoutState::INACTIVE;
for (auto *listener : this->listeners_)
listener->on_scan_end();

8
esphome/components/esp32_ble_tracker/esp32_ble_tracker.h
View File

@@ -367,6 +367,14 @@ class ESP32BLETracker : public Component,
#ifdef USE_ESP32_BLE_SOFTWARE_COEXISTENCE
bool coex_prefer_ble_{false};
#endif
// Scan timeout state machine
enum class ScanTimeoutState : uint8_t {
INACTIVE, // No timeout monitoring
MONITORING, // Actively monitoring for timeout
EXCEEDED_WAIT, // Timeout exceeded, waiting one loop before reboot
};
uint32_t scan_start_time_{0};
ScanTimeoutState scan_timeout_state_{ScanTimeoutState::INACTIVE};
};
// NOLINTNEXTLINE