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Code Issues Releases Wiki Activity

[esp32_ble_client] Fix BLE connection stability for WiFi-based proxies (#9993)

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Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: pre-commit-ci-lite[bot] <117423508+pre-commit-ci-lite[bot]@users.noreply.github.com>
This commit is contained in:
J. Nick Koston
2025-07-30 17:36:33 -10:00
committed by GitHub
parent fb379bbb88
commit 88cfcc1967
1 changed files with 41 additions and 24 deletions
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55
esphome/components/esp32_ble_client/ble_client_base.cpp
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@@ -13,10 +13,15 @@ namespace esp32_ble_client {
static const char *const TAG = "esp32_ble_client";
// Connection interval defaults matching ESP-IDF's BTM_BLE_CONN_INT_*_DEF
static const uint16_t DEFAULT_MIN_CONN_INTERVAL = 0x0A; // 10 * 1.25ms = 12.5ms
static const uint16_t DEFAULT_MAX_CONN_INTERVAL = 0x0C; // 12 * 1.25ms = 15ms
static const uint16_t DEFAULT_CONN_TIMEOUT = 600; // 600 * 10ms = 6s
// Intermediate connection parameters for standard operation
// ESP-IDF defaults (12.5-15ms) are too slow for stable connections through WiFi-based BLE proxies,
// causing disconnections. These medium parameters balance responsiveness with bandwidth usage.
static const uint16_t MEDIUM_MIN_CONN_INTERVAL = 0x08; // 8 * 1.25ms = 10ms
static const uint16_t MEDIUM_MAX_CONN_INTERVAL = 0x0A; // 10 * 1.25ms = 12.5ms
// The timeout value was increased from 6s to 8s to address stability issues observed
// in certain BLE devices when operating through WiFi-based BLE proxies. The longer
// timeout reduces the likelihood of disconnections during periods of high latency.
static const uint16_t MEDIUM_CONN_TIMEOUT = 800; // 800 * 10ms = 8s
// Fastest connection parameters for devices with short discovery timeouts
static const uint16_t FAST_MIN_CONN_INTERVAL = 0x06; // 6 * 1.25ms = 7.5ms (BLE minimum)
@@ -151,20 +156,32 @@ void BLEClientBase::connect() {
} else {
this->set_state(espbt::ClientState::CONNECTING);
// For connections without cache, set fast connection parameters after initiating connection
// This ensures service discovery completes within the 10-second timeout that
// some devices like HomeKit BLE sensors enforce
// Always set connection parameters to ensure stable operation
// Use FAST for V3_WITHOUT_CACHE (devices that need lowest latency)
// Use MEDIUM for all other connections (balanced performance)
uint16_t min_interval, max_interval, timeout;
const char *param_type;
if (this->connection_type_ == espbt::ConnectionType::V3_WITHOUT_CACHE) {
auto param_ret =
esp_ble_gap_set_prefer_conn_params(this->remote_bda_, FAST_MIN_CONN_INTERVAL, FAST_MAX_CONN_INTERVAL,
min_interval = FAST_MIN_CONN_INTERVAL;
max_interval = FAST_MAX_CONN_INTERVAL;
timeout = FAST_CONN_TIMEOUT;
param_type = "fast";
} else {
min_interval = MEDIUM_MIN_CONN_INTERVAL;
max_interval = MEDIUM_MAX_CONN_INTERVAL;
timeout = MEDIUM_CONN_TIMEOUT;
param_type = "medium";
}
auto param_ret = esp_ble_gap_set_prefer_conn_params(this->remote_bda_, min_interval, max_interval,
0, // latency: 0
FAST_CONN_TIMEOUT);
timeout);
if (param_ret != ESP_OK) {
ESP_LOGW(TAG, "[%d] [%s] esp_ble_gap_set_prefer_conn_params failed: %d", this->connection_index_,
this->address_str_.c_str(), param_ret);
} else {
ESP_LOGD(TAG, "[%d] [%s] Set fast conn params", this->connection_index_, this->address_str_.c_str());
}
ESP_LOGD(TAG, "[%d] [%s] Set %s conn params", this->connection_index_, this->address_str_.c_str(), param_type);
}
}
}
@@ -394,17 +411,17 @@ bool BLEClientBase::gattc_event_handler(esp_gattc_cb_event_t event, esp_gatt_if_
}
ESP_LOGI(TAG, "[%d] [%s] Service discovery complete", this->connection_index_, this->address_str_.c_str());
// For non-cached connections, restore default connection parameters after service discovery
// Now that we've discovered all services, we can use more balanced parameters
// that save power and reduce interference
// For non-cached connections, restore to medium connection parameters after service discovery
// This balances performance with bandwidth usage after the critical discovery phase
if (this->connection_type_ == espbt::ConnectionType::V3_WITHOUT_CACHE) {
esp_ble_conn_update_params_t conn_params = {{0}};
memcpy(conn_params.bda, this->remote_bda_, sizeof(esp_bd_addr_t));
conn_params.min_int = DEFAULT_MIN_CONN_INTERVAL;
conn_params.max_int = DEFAULT_MAX_CONN_INTERVAL;
conn_params.min_int = MEDIUM_MIN_CONN_INTERVAL;
conn_params.max_int = MEDIUM_MAX_CONN_INTERVAL;
conn_params.latency = 0;
conn_params.timeout = DEFAULT_CONN_TIMEOUT;
ESP_LOGD(TAG, "[%d] [%s] Restored default conn params", this->connection_index_, this->address_str_.c_str());
conn_params.timeout = MEDIUM_CONN_TIMEOUT;
ESP_LOGD(TAG, "[%d] [%s] Restored medium conn params after service discovery", this->connection_index_,
this->address_str_.c_str());
esp_ble_gap_update_conn_params(&conn_params);
}