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[esp32_ble_client] Optimize BLE connection parameters for different connection types (#10356)

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This commit is contained in:
J. Nick Koston
2025-08-24 22:17:26 +02:00
committed by Jesse Hills
parent 07715dd50f
commit 959ffde60e
2 changed files with 54 additions and 51 deletions
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99
esphome/components/esp32_ble_client/ble_client_base.cpp
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@@ -7,6 +7,7 @@
#include <esp_gap_ble_api.h>
#include <esp_gatt_defs.h>
#include <esp_gattc_api.h>
namespace esphome::esp32_ble_client {
@@ -111,43 +112,19 @@ void BLEClientBase::connect() {
this->remote_addr_type_);
this->paired_ = false;
// Set preferred connection parameters before connecting
// Use FAST for all V3 connections (better latency and reliability)
// Use MEDIUM for V1/legacy connections (balanced performance)
uint16_t min_interval, max_interval, timeout;
const char *param_type;
if (this->connection_type_ == espbt::ConnectionType::V3_WITHOUT_CACHE ||
this->connection_type_ == espbt::ConnectionType::V3_WITH_CACHE) {
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";
// Determine connection parameters based on connection type
if (this->connection_type_ == espbt::ConnectionType::V3_WITHOUT_CACHE) {
// V3 without cache needs fast params for service discovery
this->set_conn_params_(FAST_MIN_CONN_INTERVAL, FAST_MAX_CONN_INTERVAL, 0, FAST_CONN_TIMEOUT, "fast");
} else if (this->connection_type_ == espbt::ConnectionType::V3_WITH_CACHE) {
// V3 with cache can use medium params
this->set_conn_params_(MEDIUM_MIN_CONN_INTERVAL, MEDIUM_MAX_CONN_INTERVAL, 0, MEDIUM_CONN_TIMEOUT, "medium");
}
// For V1/Legacy, don't set params - use ESP-IDF defaults
auto param_ret = esp_ble_gap_set_prefer_conn_params(this->remote_bda_, min_interval, max_interval,
0, // latency: 0
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 {
this->log_connection_params_(param_type);
}
// Now open the connection
// Open the connection
auto ret = esp_ble_gattc_open(this->gattc_if_, this->remote_bda_, this->remote_addr_type_, true);
if (ret) {
this->log_gattc_warning_("esp_ble_gattc_open", ret);
this->set_state(espbt::ClientState::IDLE);
} else {
this->set_state(espbt::ClientState::CONNECTING);
}
this->handle_connection_result_(ret);
}
esp_err_t BLEClientBase::pair() { return esp_ble_set_encryption(this->remote_bda_, ESP_BLE_SEC_ENCRYPT); }
@@ -231,6 +208,15 @@ void BLEClientBase::log_connection_params_(const char *param_type) {
ESP_LOGD(TAG, "[%d] [%s] %s conn params", this->connection_index_, this->address_str_.c_str(), param_type);
}
void BLEClientBase::handle_connection_result_(esp_err_t ret) {
if (ret) {
this->log_gattc_warning_("esp_ble_gattc_open", ret);
this->set_state(espbt::ClientState::IDLE);
} else {
this->set_state(espbt::ClientState::CONNECTING);
}
}
void BLEClientBase::log_error_(const char *message) {
ESP_LOGE(TAG, "[%d] [%s] %s", this->connection_index_, this->address_str_.c_str(), message);
}
@@ -243,17 +229,30 @@ void BLEClientBase::log_warning_(const char *message) {
ESP_LOGW(TAG, "[%d] [%s] %s", this->connection_index_, this->address_str_.c_str(), message);
}
void BLEClientBase::restore_medium_conn_params_() {
// Restore to medium connection parameters after initial connection phase
// This balances performance with bandwidth usage for normal operation
void BLEClientBase::update_conn_params_(uint16_t min_interval, uint16_t max_interval, uint16_t latency,
uint16_t timeout, const char *param_type) {
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 = MEDIUM_MIN_CONN_INTERVAL;
conn_params.max_int = MEDIUM_MAX_CONN_INTERVAL;
conn_params.latency = 0;
conn_params.timeout = MEDIUM_CONN_TIMEOUT;
this->log_connection_params_("medium");
esp_ble_gap_update_conn_params(&conn_params);
conn_params.min_int = min_interval;
conn_params.max_int = max_interval;
conn_params.latency = latency;
conn_params.timeout = timeout;
this->log_connection_params_(param_type);
esp_err_t err = esp_ble_gap_update_conn_params(&conn_params);
if (err != ESP_OK) {
this->log_gattc_warning_("esp_ble_gap_update_conn_params", err);
}
}
void BLEClientBase::set_conn_params_(uint16_t min_interval, uint16_t max_interval, uint16_t latency, uint16_t timeout,
const char *param_type) {
// Set preferred connection parameters before connecting
// These will be used when establishing the connection
this->log_connection_params_(param_type);
esp_err_t err = esp_ble_gap_set_prefer_conn_params(this->remote_bda_, min_interval, max_interval, latency, timeout);
if (err != ESP_OK) {
this->log_gattc_warning_("esp_ble_gap_set_prefer_conn_params", err);
}
}
bool BLEClientBase::gattc_event_handler(esp_gattc_cb_event_t event, esp_gatt_if_t esp_gattc_if,
@@ -308,12 +307,13 @@ bool BLEClientBase::gattc_event_handler(esp_gattc_cb_event_t event, esp_gatt_if_
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) {
// Restore to medium connection parameters for cached connections too
this->restore_medium_conn_params_();
// Cached connections already connected with medium parameters, no update needed
// only set our state, subclients might have more stuff to do yet.
this->state_ = espbt::ClientState::ESTABLISHED;
break;
}
// For V3_WITHOUT_CACHE, we already set fast params before connecting
// No need to update them again here
this->log_event_("Searching for services");
esp_ble_gattc_search_service(esp_gattc_if, param->cfg_mtu.conn_id, nullptr);
break;
@@ -395,12 +395,11 @@ bool BLEClientBase::gattc_event_handler(esp_gattc_cb_event_t event, esp_gatt_if_
if (this->conn_id_ != param->search_cmpl.conn_id)
return false;
this->log_gattc_event_("SEARCH_CMPL");
// For V3 connections, restore to medium connection parameters after service discovery
// For V3_WITHOUT_CACHE, switch back 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 ||
this->connection_type_ == espbt::ConnectionType::V3_WITH_CACHE) {
this->restore_medium_conn_params_();
} else {
if (this->connection_type_ == espbt::ConnectionType::V3_WITHOUT_CACHE) {
this->update_conn_params_(MEDIUM_MIN_CONN_INTERVAL, MEDIUM_MAX_CONN_INTERVAL, 0, MEDIUM_CONN_TIMEOUT, "medium");
} else if (this->connection_type_ != espbt::ConnectionType::V3_WITH_CACHE) {
#ifdef USE_ESP32_BLE_DEVICE
for (auto &svc : this->services_) {
ESP_LOGV(TAG, "[%d] [%s] Service UUID: %s", this->connection_index_, this->address_str_.c_str(),

6
esphome/components/esp32_ble_client/ble_client_base.h
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@@ -133,10 +133,14 @@ class BLEClientBase : public espbt::ESPBTClient, public Component {
void log_event_(const char *name);
void log_gattc_event_(const char *name);
void restore_medium_conn_params_();
void update_conn_params_(uint16_t min_interval, uint16_t max_interval, uint16_t latency, uint16_t timeout,
const char *param_type);
void set_conn_params_(uint16_t min_interval, uint16_t max_interval, uint16_t latency, uint16_t timeout,
const char *param_type);
void log_gattc_warning_(const char *operation, esp_gatt_status_t status);
void log_gattc_warning_(const char *operation, esp_err_t err);
void log_connection_params_(const char *param_type);
void handle_connection_result_(esp_err_t ret);
// Compact error logging helpers to reduce flash usage
void log_error_(const char *message);
void log_error_(const char *message, int code);