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[esp32_ble_client] Fix connection failures with short discovery timeout devices and speed up BLE connections

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This commit is contained in:
J. Nick Koston
2025-07-29 14:24:46 -10:00
parent 76d33308d9
commit f810ebbf79
1 changed files with 50 additions and 4 deletions
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54
esphome/components/esp32_ble_client/ble_client_base.cpp
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@@ -5,6 +5,8 @@
#ifdef USE_ESP32
#include <esp_gap_ble_api.h>
namespace esphome {
namespace esp32_ble_client {
@@ -129,6 +131,25 @@ void BLEClientBase::connect() {
ESP_LOGI(TAG, "[%d] [%s] 0x%02x Attempting BLE connection", this->connection_index_, this->address_str_.c_str(),
this->remote_addr_type_);
this->paired_ = false;
// For connections without cache, set fast connection parameters before connecting
// This ensures service discovery completes within the 10-second timeout that
// some devices like HomeKit BLE sensors enforce
if (this->connection_type_ == espbt::ConnectionType::V3_WITHOUT_CACHE) {
auto ret = esp_ble_gap_set_prefer_conn_params(this->remote_bda_,
0x06, // min_int: 7.5ms
0x06, // max_int: 7.5ms
0, // latency: 0
1000); // timeout: 10s
if (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(), ret);
} else {
ESP_LOGD(TAG, "[%d] [%s] Set preferred connection params for fast discovery (no cache)", this->connection_index_,
this->address_str_.c_str());
}
}
auto ret = esp_ble_gattc_open(this->gattc_if_, this->remote_bda_, this->remote_addr_type_, true);
if (ret) {
ESP_LOGW(TAG, "[%d] [%s] esp_ble_gattc_open error, status=%d", this->connection_index_, this->address_str_.c_str(),
@@ -278,12 +299,14 @@ bool BLEClientBase::gattc_event_handler(esp_gattc_cb_event_t event, esp_gatt_if_
this->address_str_.c_str(), ret);
}
this->set_state(espbt::ClientState::CONNECTED);
ESP_LOGI(TAG, "[%d] [%s] Connection open", this->connection_index_, this->address_str_.c_str());
if (this->connection_type_ == espbt::ConnectionType::V3_WITH_CACHE) {
ESP_LOGI(TAG, "[%d] [%s] Connected", this->connection_index_, this->address_str_.c_str());
ESP_LOGI(TAG, "[%d] [%s] Using cached services", this->connection_index_, this->address_str_.c_str());
// only set our state, subclients might have more stuff to do yet.
this->state_ = espbt::ClientState::ESTABLISHED;
break;
}
ESP_LOGD(TAG, "[%d] [%s] Searching for services", this->connection_index_, this->address_str_.c_str());
esp_ble_gattc_search_service(esp_gattc_if, param->cfg_mtu.conn_id, nullptr);
break;
}
@@ -296,8 +319,15 @@ bool BLEClientBase::gattc_event_handler(esp_gattc_cb_event_t event, esp_gatt_if_
case ESP_GATTC_DISCONNECT_EVT: {
if (!this->check_addr(param->disconnect.remote_bda))
return false;
ESP_LOGD(TAG, "[%d] [%s] ESP_GATTC_DISCONNECT_EVT, reason %d", this->connection_index_,
this->address_str_.c_str(), param->disconnect.reason);
// Check if we were disconnected while waiting for service discovery
if (param->disconnect.reason == 0x13 && // 0x13 = ESP_GATT_CONN_TERMINATE_PEER
this->state_ == espbt::ClientState::CONNECTED) {
ESP_LOGW(TAG, "[%d] [%s] Disconnected by remote during service discovery", this->connection_index_,
this->address_str_.c_str());
} else {
ESP_LOGD(TAG, "[%d] [%s] ESP_GATTC_DISCONNECT_EVT, reason 0x%02x", this->connection_index_,
this->address_str_.c_str(), param->disconnect.reason);
}
this->release_services();
this->set_state(espbt::ClientState::IDLE);
break;
@@ -353,7 +383,23 @@ bool BLEClientBase::gattc_event_handler(esp_gattc_cb_event_t event, esp_gatt_if_
ESP_LOGV(TAG, "[%d] [%s] start_handle: 0x%x end_handle: 0x%x", this->connection_index_,
this->address_str_.c_str(), svc->start_handle, svc->end_handle);
}
ESP_LOGI(TAG, "[%d] [%s] Connected", this->connection_index_, this->address_str_.c_str());
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
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 = 0x0A; // 12.5ms - ESP-IDF default minimum (BTM_BLE_CONN_INT_MIN_DEF)
conn_params.max_int = 0x0C; // 15ms - ESP-IDF default maximum (BTM_BLE_CONN_INT_MAX_DEF)
conn_params.latency = 0;
conn_params.timeout = 600; // 6s - ESP-IDF default timeout (BTM_BLE_CONN_TIMEOUT_DEF)
ESP_LOGD(TAG, "[%d] [%s] Restoring default connection parameters after service discovery",
this->connection_index_, this->address_str_.c_str());
esp_ble_gap_update_conn_params(&conn_params);
}
this->state_ = espbt::ClientState::ESTABLISHED;
break;
}