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Code Issues Releases Wiki Activity

[api] Implement zero-copy API for bluetooth_proxy writes (#10840)

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This commit is contained in:
J. Nick Koston
2025-09-23 13:48:57 -05:00
committed by GitHub
parent a7ee7b962e
commit 2f8a4d0caa
10 changed files with 151 additions and 27 deletions
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15
esphome/components/bluetooth_proxy/bluetooth_connection.cpp
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@@ -514,7 +514,8 @@ esp_err_t BluetoothConnection::read_characteristic(uint16_t handle) {
return this->check_and_log_error_("esp_ble_gattc_read_char", err);
}
esp_err_t BluetoothConnection::write_characteristic(uint16_t handle, const std::string &data, bool response) {
esp_err_t BluetoothConnection::write_characteristic(uint16_t handle, const uint8_t *data, size_t length,
bool response) {
if (!this->connected()) {
this->log_gatt_not_connected_("write", "characteristic");
return ESP_GATT_NOT_CONNECTED;
@@ -522,8 +523,11 @@ esp_err_t BluetoothConnection::write_characteristic(uint16_t handle, const std::
ESP_LOGV(TAG, "[%d] [%s] Writing GATT characteristic handle %d", this->connection_index_, this->address_str_.c_str(),
handle);
// ESP-IDF's API requires a non-const uint8_t* but it doesn't modify the data
// The BTC layer immediately copies the data to its own buffer (see btc_gattc.c)
// const_cast is safe here and was previously hidden by a C-style cast
esp_err_t err =
esp_ble_gattc_write_char(this->gattc_if_, this->conn_id_, handle, data.size(), (uint8_t *) data.data(),
esp_ble_gattc_write_char(this->gattc_if_, this->conn_id_, handle, length, const_cast<uint8_t *>(data),
response ? ESP_GATT_WRITE_TYPE_RSP : ESP_GATT_WRITE_TYPE_NO_RSP, ESP_GATT_AUTH_REQ_NONE);
return this->check_and_log_error_("esp_ble_gattc_write_char", err);
}
@@ -540,7 +544,7 @@ esp_err_t BluetoothConnection::read_descriptor(uint16_t handle) {
return this->check_and_log_error_("esp_ble_gattc_read_char_descr", err);
}
esp_err_t BluetoothConnection::write_descriptor(uint16_t handle, const std::string &data, bool response) {
esp_err_t BluetoothConnection::write_descriptor(uint16_t handle, const uint8_t *data, size_t length, bool response) {
if (!this->connected()) {
this->log_gatt_not_connected_("write", "descriptor");
return ESP_GATT_NOT_CONNECTED;
@@ -548,8 +552,11 @@ esp_err_t BluetoothConnection::write_descriptor(uint16_t handle, const std::stri
ESP_LOGV(TAG, "[%d] [%s] Writing GATT descriptor handle %d", this->connection_index_, this->address_str_.c_str(),
handle);
// ESP-IDF's API requires a non-const uint8_t* but it doesn't modify the data
// The BTC layer immediately copies the data to its own buffer (see btc_gattc.c)
// const_cast is safe here and was previously hidden by a C-style cast
esp_err_t err = esp_ble_gattc_write_char_descr(
this->gattc_if_, this->conn_id_, handle, data.size(), (uint8_t *) data.data(),
this->gattc_if_, this->conn_id_, handle, length, const_cast<uint8_t *>(data),
response ? ESP_GATT_WRITE_TYPE_RSP : ESP_GATT_WRITE_TYPE_NO_RSP, ESP_GATT_AUTH_REQ_NONE);
return this->check_and_log_error_("esp_ble_gattc_write_char_descr", err);
}