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esphome/esphome/components/esp32_ble_client/ble_client_base.cpp

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#include "ble_client_base.h"
#include "esphome/core/helpers.h"
#include "esphome/core/log.h"
#ifdef USE_ESP32
namespace esphome {
namespace esp32_ble_client {
static const char *const TAG = "esp32_ble_client";
void BLEClientBase::setup() {
static uint8_t connection_index = 0;
this->connection_index_ = connection_index++;
auto ret = esp_ble_gattc_app_register(this->app_id);
if (ret) {
ESP_LOGE(TAG, "gattc app register failed. app_id=%d code=%d", this->app_id, ret);
this->mark_failed();
}
this->set_state(espbt::ClientState::IDLE);
}
void BLEClientBase::loop() {
if (this->state_ == espbt::ClientState::DISCOVERED) {
this->connect();
}
}
float BLEClientBase::get_setup_priority() const { return setup_priority::AFTER_BLUETOOTH; }
bool BLEClientBase::parse_device(const espbt::ESPBTDevice &device) {
if (device.address_uint64() != this->address_)
return false;
if (this->state_ != espbt::ClientState::IDLE && this->state_ != espbt::ClientState::SEARCHING)
return false;
ESP_LOGD(TAG, "[%d] [%s] Found device", this->connection_index_, this->address_str_.c_str());
this->set_state(espbt::ClientState::DISCOVERED);
auto addr = device.address_uint64();
this->remote_bda_[0] = (addr >> 40) & 0xFF;
this->remote_bda_[1] = (addr >> 32) & 0xFF;
this->remote_bda_[2] = (addr >> 24) & 0xFF;
this->remote_bda_[3] = (addr >> 16) & 0xFF;
this->remote_bda_[4] = (addr >> 8) & 0xFF;
this->remote_bda_[5] = (addr >> 0) & 0xFF;
this->remote_addr_type_ = device.get_address_type();
return true;
}
void BLEClientBase::connect() {
ESP_LOGI(TAG, "[%d] [%s] Attempting BLE connection", 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(),
ret);
this->set_state(espbt::ClientState::IDLE);
} else {
this->set_state(espbt::ClientState::CONNECTING);
}
}
void BLEClientBase::disconnect() {
ESP_LOGI(TAG, "[%d] [%s] Disconnecting.", this->connection_index_, this->address_str_.c_str());
auto err = esp_ble_gattc_close(this->gattc_if_, this->conn_id_);
if (err != ESP_OK) {
ESP_LOGW(TAG, "[%d] [%s] esp_ble_gattc_close error, err=%d", this->connection_index_, this->address_str_.c_str(),
err);
}
if (this->state_ == espbt::ClientState::SEARCHING) {
this->set_address(0);
this->set_state(espbt::ClientState::IDLE);
}
}
bool BLEClientBase::gattc_event_handler(esp_gattc_cb_event_t event, esp_gatt_if_t esp_gattc_if,
esp_ble_gattc_cb_param_t *param) {
if (event == ESP_GATTC_REG_EVT && this->app_id != param->reg.app_id)
return false;
if (event != ESP_GATTC_REG_EVT && esp_gattc_if != ESP_GATT_IF_NONE && esp_gattc_if != this->gattc_if_)
return false;
ESP_LOGV(TAG, "[%d] [%s] gattc_event_handler: event=%d gattc_if=%d", this->connection_index_,
this->address_str_.c_str(), event, esp_gattc_if);
switch (event) {
case ESP_GATTC_REG_EVT: {
if (param->reg.status == ESP_GATT_OK) {
ESP_LOGV(TAG, "[%d] [%s] gattc registered app id %d", this->connection_index_, this->address_str_.c_str(),
this->app_id);
this->gattc_if_ = esp_gattc_if;
} else {
ESP_LOGE(TAG, "[%d] [%s] gattc app registration failed id=%d code=%d", this->connection_index_,
this->address_str_.c_str(), param->reg.app_id, param->reg.status);
}
break;
}
case ESP_GATTC_OPEN_EVT: {
ESP_LOGV(TAG, "[%d] [%s] ESP_GATTC_OPEN_EVT", this->connection_index_, this->address_str_.c_str());
this->conn_id_ = param->open.conn_id;
if (param->open.status != ESP_GATT_OK && param->open.status != ESP_GATT_ALREADY_OPEN) {
ESP_LOGW(TAG, "[%d] [%s] Connection failed, status=%d", this->connection_index_, this->address_str_.c_str(),
param->open.status);
this->set_state(espbt::ClientState::IDLE);
break;
}
auto ret = esp_ble_gattc_send_mtu_req(this->gattc_if_, param->open.conn_id);
if (ret) {
ESP_LOGW(TAG, "[%d] [%s] esp_ble_gattc_send_mtu_req failed, status=%x", this->connection_index_,
this->address_str_.c_str(), ret);
}
break;
}
case ESP_GATTC_CFG_MTU_EVT: {
if (param->cfg_mtu.status != ESP_GATT_OK) {
ESP_LOGW(TAG, "[%d] [%s] cfg_mtu failed, mtu %d, status %d", this->connection_index_,
this->address_str_.c_str(), param->cfg_mtu.mtu, param->cfg_mtu.status);
this->set_state(espbt::ClientState::IDLE);
break;
}
ESP_LOGV(TAG, "[%d] [%s] cfg_mtu status %d, mtu %d", this->connection_index_, this->address_str_.c_str(),
param->cfg_mtu.status, param->cfg_mtu.mtu);
this->mtu_ = param->cfg_mtu.mtu;
esp_ble_gattc_search_service(esp_gattc_if, param->cfg_mtu.conn_id, nullptr);
break;
}
case ESP_GATTC_DISCONNECT_EVT: {
if (memcmp(param->disconnect.remote_bda, this->remote_bda_, 6) != 0)
return false;
ESP_LOGV(TAG, "[%d] [%s] ESP_GATTC_DISCONNECT_EVT, reason %d", this->connection_index_,
this->address_str_.c_str(), param->disconnect.reason);
for (auto &svc : this->services_)
delete svc; // NOLINT(cppcoreguidelines-owning-memory)
this->services_.clear();
this->set_state(espbt::ClientState::IDLE);
break;
}
case ESP_GATTC_SEARCH_RES_EVT: {
BLEService *ble_service = new BLEService(); // NOLINT(cppcoreguidelines-owning-memory)
ble_service->uuid = espbt::ESPBTUUID::from_uuid(param->search_res.srvc_id.uuid);
ble_service->start_handle = param->search_res.start_handle;
ble_service->end_handle = param->search_res.end_handle;
ble_service->client = this;
this->services_.push_back(ble_service);
break;
}
case ESP_GATTC_SEARCH_CMPL_EVT: {
ESP_LOGV(TAG, "[%d] [%s] ESP_GATTC_SEARCH_CMPL_EVT", this->connection_index_, this->address_str_.c_str());
for (auto &svc : this->services_) {
ESP_LOGI(TAG, "[%d] [%s] Service UUID: %s", this->connection_index_, this->address_str_.c_str(),
svc->uuid.to_string().c_str());
ESP_LOGI(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);
svc->parse_characteristics();
}
this->set_state(espbt::ClientState::CONNECTED);
this->state_ = espbt::ClientState::ESTABLISHED;
break;
}
case ESP_GATTC_REG_FOR_NOTIFY_EVT: {
auto *descr = this->get_config_descriptor(param->reg_for_notify.handle);
if (descr->uuid.get_uuid().len != ESP_UUID_LEN_16 ||
descr->uuid.get_uuid().uuid.uuid16 != ESP_GATT_UUID_CHAR_CLIENT_CONFIG) {
ESP_LOGW(TAG, "[%d] [%s] Handle 0x%x (uuid %s) is not a client config char uuid", this->connection_index_,
this->address_str_.c_str(), param->reg_for_notify.handle, descr->uuid.to_string().c_str());
break;
}
uint16_t notify_en = 1;
auto status =
esp_ble_gattc_write_char_descr(this->gattc_if_, this->conn_id_, descr->handle, sizeof(notify_en),
(uint8_t *) &notify_en, ESP_GATT_WRITE_TYPE_RSP, ESP_GATT_AUTH_REQ_NONE);
if (status) {
ESP_LOGW(TAG, "[%d] [%s] esp_ble_gattc_write_char_descr error, status=%d", this->connection_index_,
this->address_str_.c_str(), status);
}
break;
}
default:
break;
}
return true;
}
void BLEClientBase::gap_event_handler(esp_gap_ble_cb_event_t event, esp_ble_gap_cb_param_t *param) {
switch (event) {
// This event is sent by the server when it requests security
case ESP_GAP_BLE_SEC_REQ_EVT:
ESP_LOGV(TAG, "[%d] [%s] ESP_GAP_BLE_SEC_REQ_EVT %x", this->connection_index_, this->address_str_.c_str(), event);
esp_ble_gap_security_rsp(param->ble_security.ble_req.bd_addr, true);
break;
// This event is sent once authentication has completed
case ESP_GAP_BLE_AUTH_CMPL_EVT:
esp_bd_addr_t bd_addr;
memcpy(bd_addr, param->ble_security.auth_cmpl.bd_addr, sizeof(esp_bd_addr_t));
ESP_LOGI(TAG, "[%d] [%s] auth complete. remote BD_ADDR: %s", this->connection_index_, this->address_str_.c_str(),
format_hex(bd_addr, 6).c_str());
if (!param->ble_security.auth_cmpl.success) {
ESP_LOGE(TAG, "[%d] [%s] auth fail reason = 0x%x", this->connection_index_, this->address_str_.c_str(),
param->ble_security.auth_cmpl.fail_reason);
} else {
ESP_LOGV(TAG, "[%d] [%s] auth success. address type = %d auth mode = %d", this->connection_index_,
this->address_str_.c_str(), param->ble_security.auth_cmpl.addr_type,
param->ble_security.auth_cmpl.auth_mode);
}
break;
// There are other events we'll want to implement at some point to support things like pass key
// https://github.com/espressif/esp-idf/blob/cba69dd088344ed9d26739f04736ae7a37541b3a/examples/bluetooth/bluedroid/ble/gatt_security_client/tutorial/Gatt_Security_Client_Example_Walkthrough.md
default:
break;
}
}
// Parse GATT values into a float for a sensor.
// Ref: https://www.bluetooth.com/specifications/assigned-numbers/format-types/
float BLEClientBase::parse_char_value(uint8_t *value, uint16_t length) {
// A length of one means a single octet value.
if (length == 0)
return 0;
if (length == 1)
return (float) ((uint8_t) value[0]);
switch (value[0]) {
case 0x1: // boolean.
case 0x2: // 2bit.
case 0x3: // nibble.
case 0x4: // uint8.
return (float) ((uint8_t) value[1]);
case 0x5: // uint12.
case 0x6: // uint16.
if (length > 2) {
return (float) encode_uint16(value[1], value[2]);
}
case 0x7: // uint24.
if (length > 3) {
return (float) encode_uint24(value[1], value[2], value[3]);
}
case 0x8: // uint32.
if (length > 4) {
return (float) encode_uint32(value[1], value[2], value[3], value[4]);
}
case 0xC: // int8.
return (float) ((int8_t) value[1]);
case 0xD: // int12.
case 0xE: // int16.
if (length > 2) {
return (float) ((int16_t)(value[1] << 8) + (int16_t) value[2]);
}
case 0xF: // int24.
if (length > 3) {
return (float) ((int32_t)(value[1] << 16) + (int32_t)(value[2] << 8) + (int32_t)(value[3]));
}
case 0x10: // int32.
if (length > 4) {
return (float) ((int32_t)(value[1] << 24) + (int32_t)(value[2] << 16) + (int32_t)(value[3] << 8) +
(int32_t)(value[4]));
}
}
ESP_LOGW(TAG, "[%d] [%s] Cannot parse characteristic value of type 0x%x length %d", this->connection_index_,
this->address_str_.c_str(), value[0], length);
return NAN;
}
BLEService *BLEClientBase::get_service(espbt::ESPBTUUID uuid) {
for (auto *svc : this->services_) {
if (svc->uuid == uuid)
return svc;
}
return nullptr;
}
BLEService *BLEClientBase::get_service(uint16_t uuid) { return this->get_service(espbt::ESPBTUUID::from_uint16(uuid)); }
BLECharacteristic *BLEClientBase::get_characteristic(espbt::ESPBTUUID service, espbt::ESPBTUUID chr) {
auto *svc = this->get_service(service);
if (svc == nullptr)
return nullptr;
return svc->get_characteristic(chr);
}
BLECharacteristic *BLEClientBase::get_characteristic(uint16_t service, uint16_t chr) {
return this->get_characteristic(espbt::ESPBTUUID::from_uint16(service), espbt::ESPBTUUID::from_uint16(chr));
}
BLECharacteristic *BLEClientBase::get_characteristic(uint16_t handle) {
for (auto *svc : this->services_) {
for (auto *chr : svc->characteristics) {
if (chr->handle == handle)
return chr;
}
}
return nullptr;
}
BLEDescriptor *BLEClientBase::get_config_descriptor(uint16_t handle) {
auto *chr = this->get_characteristic(handle);
if (chr != nullptr) {
for (auto &desc : chr->descriptors) {
if (desc->uuid == espbt::ESPBTUUID::from_uint16(0x2902))
return desc;
}
}
return nullptr;
}
BLEDescriptor *BLEClientBase::get_descriptor(espbt::ESPBTUUID service, espbt::ESPBTUUID chr, espbt::ESPBTUUID descr) {
auto *svc = this->get_service(service);
if (svc == nullptr)
return nullptr;
auto *ch = svc->get_characteristic(chr);
if (ch == nullptr)
return nullptr;
return ch->get_descriptor(descr);
}
BLEDescriptor *BLEClientBase::get_descriptor(uint16_t service, uint16_t chr, uint16_t descr) {
return this->get_descriptor(espbt::ESPBTUUID::from_uint16(service), espbt::ESPBTUUID::from_uint16(chr),
espbt::ESPBTUUID::from_uint16(descr));
}
BLEDescriptor *BLEClientBase::get_descriptor(uint16_t handle) {
for (auto *svc : this->services_) {
for (auto *chr : svc->characteristics) {
for (auto *desc : chr->descriptors) {
if (desc->handle == handle)
return desc;
}
}
}
return nullptr;
}
} // namespace esp32_ble_client
} // namespace esphome
#endif // USE_ESP32
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