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This commit is contained in:
J. Nick Koston
2025-09-29 17:49:03 -05:00
parent 29db576f79
commit 9efe9f1c19
13 changed files with 197 additions and 114 deletions
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87
esphome/components/esp32_ble_server/__init__.py
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@@ -1,4 +1,5 @@
import encodings
from typing import TypeAlias
from esphome import automation
import esphome.codegen as cg
@@ -31,6 +32,92 @@ CODEOWNERS = ["@jesserockz", "@clydebarrow", "@Rapsssito"]
DEPENDENCIES = ["esp32"]
DOMAIN = "esp32_ble_server"
# Type aliases
_ListenerAllocation: TypeAlias = tuple[str, int | str, int] # (component, uuid, count)
_ServerListenerAllocation: TypeAlias = tuple[str, int] # (component, count)
# Event listener allocation tracking - used by components to reserve slots
_LISTENER_ALLOCATIONS: dict[
str, list[_ListenerAllocation | _ServerListenerAllocation]
] = {
"characteristic_write": [],
"characteristic_read": [],
"descriptor_write": [],
"server_connect": [],
"server_disconnect": [],
}
def allocate_characteristic_event_listener(
uuid: int | str, event_type: str, component: str, count: int = 1
) -> None:
"""
Allocate event listener slots for a characteristic.
Args:
uuid: The characteristic UUID (int or string)
event_type: "WRITE" or "READ"
component: Name of the component requesting allocation
count: Number of listeners needed (default 1)
"""
if event_type not in ("WRITE", "READ"):
raise ValueError(f"Unknown event_type: {event_type}")
key = f"characteristic_{event_type.lower()}"
_LISTENER_ALLOCATIONS[key].append((component, uuid, count))
def allocate_descriptor_event_listener(
uuid: int | str, event_type: str, component: str, count: int = 1
) -> None:
"""Allocate event listener slots for a descriptor."""
if event_type != "WRITE":
raise ValueError(f"Unknown event_type: {event_type}")
_LISTENER_ALLOCATIONS["descriptor_write"].append((component, uuid, count))
def allocate_server_event_listener(
event_type: str, component: str, count: int = 1
) -> None:
"""Allocate event listener slots for server events."""
if event_type not in ("CONNECT", "DISCONNECT"):
raise ValueError(f"Unknown event_type: {event_type}")
key = f"server_{event_type.lower()}"
_LISTENER_ALLOCATIONS[key].append((component, count))
def _sum_allocations_for_uuid(allocation_key: str, uuid: int | str) -> int:
"""Helper to sum allocations for a specific UUID."""
return sum(
count
for comp, alloc_uuid, count in _LISTENER_ALLOCATIONS[allocation_key]
if alloc_uuid == uuid
)
def _get_allocations_for_uuid(uuid: int | str, event_type: str) -> int:
"""Get total allocated listeners for a specific UUID and event type."""
if event_type not in ("WRITE", "READ"):
return 0
key = f"characteristic_{event_type.lower()}"
return _sum_allocations_for_uuid(key, uuid)
def _get_descriptor_allocations_for_uuid(uuid: int | str) -> int:
"""Get total allocated listeners for a descriptor UUID."""
return _sum_allocations_for_uuid("descriptor_write", uuid)
def sanitize_uuid_for_identifier(uuid: int | str) -> str:
"""Convert UUID to valid C++ identifier."""
if isinstance(uuid, int):
return f"0x{uuid:04X}"
# For string UUIDs, replace dashes and colons with underscores
return str(uuid).replace("-", "_").replace(":", "_").lower()
CONF_ADVERTISE = "advertise"
CONF_APPEARANCE = "appearance"
CONF_BROADCAST = "broadcast"

9
esphome/components/esp32_ble_server/ble_characteristic.cpp
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@@ -208,8 +208,7 @@ void BLECharacteristic::gatts_event_handler(esp_gatts_cb_event_t event, esp_gatt
if (!param->read.need_rsp)
break; // For some reason you can request a read but not want a response
this->EventEmitter<BLECharacteristicEvt::EmptyEvt, uint16_t>::emit_(BLECharacteristicEvt::EmptyEvt::ON_READ,
param->read.conn_id);
this->emit_on_read_(param->read.conn_id);
uint16_t max_offset = 22;
@@ -277,8 +276,7 @@ void BLECharacteristic::gatts_event_handler(esp_gatts_cb_event_t event, esp_gatt
}
if (!param->write.is_prep) {
this->EventEmitter<BLECharacteristicEvt::VectorEvt, std::vector<uint8_t>, uint16_t>::emit_(
BLECharacteristicEvt::VectorEvt::ON_WRITE, this->value_, param->write.conn_id);
this->emit_on_write_(this->value_, param->write.conn_id);
}
break;
@@ -289,8 +287,7 @@ void BLECharacteristic::gatts_event_handler(esp_gatts_cb_event_t event, esp_gatt
break;
this->write_event_ = false;
if (param->exec_write.exec_write_flag == ESP_GATT_PREP_WRITE_EXEC) {
this->EventEmitter<BLECharacteristicEvt::VectorEvt, std::vector<uint8_t>, uint16_t>::emit_(
BLECharacteristicEvt::VectorEvt::ON_WRITE, this->value_, param->exec_write.conn_id);
this->emit_on_write_(this->value_, param->exec_write.conn_id);
}
esp_err_t err =
esp_ble_gatts_send_response(gatts_if, param->write.conn_id, param->write.trans_id, ESP_GATT_OK, nullptr);

18
esphome/components/esp32_ble_server/ble_characteristic.h
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@@ -6,6 +6,7 @@
#include "esphome/components/bytebuffer/bytebuffer.h"
#include <vector>
#include <span>
#ifdef USE_ESP32
@@ -36,8 +37,9 @@ enum EmptyEvt {
};
} // namespace BLECharacteristicEvt
class BLECharacteristic : public EventEmitter<BLECharacteristicEvt::VectorEvt, std::vector<uint8_t>, uint16_t>,
public EventEmitter<BLECharacteristicEvt::EmptyEvt, uint16_t> {
// Base class for BLE characteristics
// Specialized classes with EventEmitter support are generated per-UUID in the build process
class BLECharacteristic {
public:
BLECharacteristic(ESPBTUUID uuid, uint32_t properties);
~BLECharacteristic();
@@ -76,7 +78,19 @@ class BLECharacteristic : public EventEmitter<BLECharacteristicEvt::VectorEvt, s
bool is_created();
bool is_failed();
// Event listener registration - overridden by generated specialized classes
virtual EventEmitterListenerID on_write(std::function<void(std::span<const uint8_t>, uint16_t)> &&listener) {
return INVALID_LISTENER_ID;
}
virtual EventEmitterListenerID on_read(std::function<void(uint16_t)> &&listener) { return INVALID_LISTENER_ID; }
virtual void off_write(EventEmitterListenerID id) {}
virtual void off_read(EventEmitterListenerID id) {}
protected:
// Virtual methods for emitting events - overridden by generated specialized classes
virtual void emit_on_write_(std::span<const uint8_t> value, uint16_t conn_id) {}
virtual void emit_on_read_(uint16_t conn_id) {}
bool write_event_{false};
BLEService *service_{};
ESPBTUUID uuid_;

4
esphome/components/esp32_ble_server/ble_descriptor.cpp
View File

@@ -74,9 +74,7 @@ void BLEDescriptor::gatts_event_handler(esp_gatts_cb_event_t event, esp_gatt_if_
break;
this->value_.attr_len = param->write.len;
memcpy(this->value_.attr_value, param->write.value, param->write.len);
this->emit_(BLEDescriptorEvt::VectorEvt::ON_WRITE,
std::vector<uint8_t>(param->write.value, param->write.value + param->write.len),
param->write.conn_id);
this->emit_on_write_(std::span<const uint8_t>(param->write.value, param->write.len), param->write.conn_id);
break;
}
default:

14
esphome/components/esp32_ble_server/ble_descriptor.h
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@@ -8,6 +8,7 @@
#include <esp_gatt_defs.h>
#include <esp_gatts_api.h>
#include <span>
namespace esphome {
namespace esp32_ble_server {
@@ -24,7 +25,9 @@ enum VectorEvt {
};
} // namespace BLEDescriptorEvt
class BLEDescriptor : public EventEmitter<BLEDescriptorEvt::VectorEvt, std::vector<uint8_t>, uint16_t> {
// Base class for BLE descriptors
// Specialized classes with EventEmitter support are generated per-UUID in the build process
class BLEDescriptor {
public:
BLEDescriptor(ESPBTUUID uuid, uint16_t max_len = 100, bool read = true, bool write = true);
virtual ~BLEDescriptor();
@@ -39,7 +42,16 @@ class BLEDescriptor : public EventEmitter<BLEDescriptorEvt::VectorEvt, std::vect
bool is_created() { return this->state_ == CREATED; }
bool is_failed() { return this->state_ == FAILED; }
// Event listener registration - overridden by generated specialized classes if needed
virtual EventEmitterListenerID on_write(std::function<void(std::span<const uint8_t>, uint16_t)> &&listener) {
return INVALID_LISTENER_ID;
}
virtual void off_write(EventEmitterListenerID id) {}
protected:
// Virtual method for emitting events - overridden by generated specialized classes
virtual void emit_on_write_(std::span<const uint8_t> value, uint16_t conn_id) {}
BLECharacteristic *characteristic_{nullptr};
ESPBTUUID uuid_;
uint16_t handle_{0xFFFF};

4
esphome/components/esp32_ble_server/ble_server.cpp
View File

@@ -153,14 +153,14 @@ void BLEServer::gatts_event_handler(esp_gatts_cb_event_t event, esp_gatt_if_t ga
case ESP_GATTS_CONNECT_EVT: {
ESP_LOGD(TAG, "BLE Client connected");
this->add_client_(param->connect.conn_id);
this->emit_(BLEServerEvt::EmptyEvt::ON_CONNECT, param->connect.conn_id);
this->emit_on_connect_(param->connect.conn_id);
break;
}
case ESP_GATTS_DISCONNECT_EVT: {
ESP_LOGD(TAG, "BLE Client disconnected");
this->remove_client_(param->disconnect.conn_id);
this->parent_->advertising_start();
this->emit_(BLEServerEvt::EmptyEvt::ON_DISCONNECT, param->disconnect.conn_id);
this->emit_on_disconnect_(param->disconnect.conn_id);
break;
}
case ESP_GATTS_REG_EVT: {

17
esphome/components/esp32_ble_server/ble_server.h
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@@ -31,11 +31,9 @@ enum EmptyEvt {
};
} // namespace BLEServerEvt
class BLEServer : public Component,
public GATTsEventHandler,
public BLEStatusEventHandler,
public Parented<ESP32BLE>,
public EventEmitter<BLEServerEvt::EmptyEvt, uint16_t> {
// Base class for BLE server
// Note: Only one BLEServer instance exists per build, so we can use fixed defines
class BLEServer : public Component, public GATTsEventHandler, public BLEStatusEventHandler, public Parented<ESP32BLE> {
public:
void setup() override;
void loop() override;
@@ -65,7 +63,16 @@ class BLEServer : public Component,
void ble_before_disabled_event_handler() override;
// Event listener registration - overridden by generated specialized classes if needed
virtual EventEmitterListenerID on_connect(std::function<void(uint16_t)> &&listener) { return INVALID_LISTENER_ID; }
virtual EventEmitterListenerID on_disconnect(std::function<void(uint16_t)> &&listener) { return INVALID_LISTENER_ID; }
virtual void off_connect(EventEmitterListenerID id) {}
virtual void off_disconnect(EventEmitterListenerID id) {}
protected:
// Virtual methods for emitting events
virtual void emit_on_connect_(uint16_t conn_id) {}
virtual void emit_on_disconnect_(uint16_t conn_id) {}
struct ServiceEntry {
ESPBTUUID uuid;
uint8_t inst_id;

23
esphome/components/esp32_ble_server/ble_server_automations.cpp
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@@ -14,9 +14,10 @@ Trigger<std::vector<uint8_t>, uint16_t> *BLETriggers::create_characteristic_on_w
BLECharacteristic *characteristic) {
Trigger<std::vector<uint8_t>, uint16_t> *on_write_trigger = // NOLINT(cppcoreguidelines-owning-memory)
new Trigger<std::vector<uint8_t>, uint16_t>();
characteristic->EventEmitter<BLECharacteristicEvt::VectorEvt, std::vector<uint8_t>, uint16_t>::on(
BLECharacteristicEvt::VectorEvt::ON_WRITE,
[on_write_trigger](const std::vector<uint8_t> &data, uint16_t id) { on_write_trigger->trigger(data, id); });
characteristic->on_write([on_write_trigger](std::span<const uint8_t> data, uint16_t id) {
// Convert span to vector for trigger
on_write_trigger->trigger(std::vector<uint8_t>(data.begin(), data.end()), id);
});
return on_write_trigger;
}
#endif
@@ -25,9 +26,10 @@ Trigger<std::vector<uint8_t>, uint16_t> *BLETriggers::create_characteristic_on_w
Trigger<std::vector<uint8_t>, uint16_t> *BLETriggers::create_descriptor_on_write_trigger(BLEDescriptor *descriptor) {
Trigger<std::vector<uint8_t>, uint16_t> *on_write_trigger = // NOLINT(cppcoreguidelines-owning-memory)
new Trigger<std::vector<uint8_t>, uint16_t>();
descriptor->on(
BLEDescriptorEvt::VectorEvt::ON_WRITE,
[on_write_trigger](const std::vector<uint8_t> &data, uint16_t id) { on_write_trigger->trigger(data, id); });
descriptor->on_write([on_write_trigger](std::span<const uint8_t> data, uint16_t id) {
// Convert span to vector for trigger
on_write_trigger->trigger(std::vector<uint8_t>(data.begin(), data.end()), id);
});
return on_write_trigger;
}
#endif
@@ -35,8 +37,7 @@ Trigger<std::vector<uint8_t>, uint16_t> *BLETriggers::create_descriptor_on_write
#ifdef USE_ESP32_BLE_SERVER_ON_CONNECT
Trigger<uint16_t> *BLETriggers::create_server_on_connect_trigger(BLEServer *server) {
Trigger<uint16_t> *on_connect_trigger = new Trigger<uint16_t>(); // NOLINT(cppcoreguidelines-owning-memory)
server->on(BLEServerEvt::EmptyEvt::ON_CONNECT,
[on_connect_trigger](uint16_t conn_id) { on_connect_trigger->trigger(conn_id); });
server->on_connect([on_connect_trigger](uint16_t conn_id) { on_connect_trigger->trigger(conn_id); });
return on_connect_trigger;
}
#endif
@@ -44,8 +45,7 @@ Trigger<uint16_t> *BLETriggers::create_server_on_connect_trigger(BLEServer *serv
#ifdef USE_ESP32_BLE_SERVER_ON_DISCONNECT
Trigger<uint16_t> *BLETriggers::create_server_on_disconnect_trigger(BLEServer *server) {
Trigger<uint16_t> *on_disconnect_trigger = new Trigger<uint16_t>(); // NOLINT(cppcoreguidelines-owning-memory)
server->on(BLEServerEvt::EmptyEvt::ON_DISCONNECT,
[on_disconnect_trigger](uint16_t conn_id) { on_disconnect_trigger->trigger(conn_id); });
server->on_disconnect([on_disconnect_trigger](uint16_t conn_id) { on_disconnect_trigger->trigger(conn_id); });
return on_disconnect_trigger;
}
#endif
@@ -58,8 +58,7 @@ void BLECharacteristicSetValueActionManager::set_listener(BLECharacteristic *cha
auto *existing = this->find_listener_(characteristic);
if (existing != nullptr) {
// Remove the previous listener
characteristic->EventEmitter<BLECharacteristicEvt::EmptyEvt, uint16_t>::off(BLECharacteristicEvt::EmptyEvt::ON_READ,
existing->listener_id);
characteristic->off_read(existing->listener_id);
// Remove the pre-notify listener
this->off(BLECharacteristicSetValueActionEvt::PRE_NOTIFY, existing->pre_notify_listener_id);
// Remove from vector

15
esphome/components/esp32_ble_server/ble_server_automations.h
View File

@@ -46,8 +46,12 @@ enum BLECharacteristicSetValueActionEvt {
};
// Class to make sure only one BLECharacteristicSetValueAction is active at a time for each characteristic
#ifndef BLE_SET_VALUE_ACTION_MAX_LISTENERS
#define BLE_SET_VALUE_ACTION_MAX_LISTENERS 1
#endif
class BLECharacteristicSetValueActionManager
: public EventEmitter<BLECharacteristicSetValueActionEvt, BLECharacteristic *> {
: public EventEmitter<BLECharacteristicSetValueActionEvt, BLE_SET_VALUE_ACTION_MAX_LISTENERS, BLECharacteristic *> {
public:
// Singleton pattern
static BLECharacteristicSetValueActionManager *get_instance() {
@@ -92,11 +96,10 @@ template<typename... Ts> class BLECharacteristicSetValueAction : public Action<T
// Set initial value
this->parent_->set_value(this->buffer_.value(x...));
// Set the listener for read events
this->listener_id_ = this->parent_->EventEmitter<BLECharacteristicEvt::EmptyEvt, uint16_t>::on(
BLECharacteristicEvt::EmptyEvt::ON_READ, [this, x...](uint16_t id) {
// Set the value of the characteristic every time it is read
this->parent_->set_value(this->buffer_.value(x...));
});
this->listener_id_ = this->parent_->on_read([this, x...](uint16_t id) {
// Set the value of the characteristic every time it is read
this->parent_->set_value(this->buffer_.value(x...));
});
// Set the listener in the global manager so only one BLECharacteristicSetValueAction is set for each characteristic
BLECharacteristicSetValueActionManager::get_instance()->set_listener(
this->parent_, this->listener_id_, [this, x...]() { this->parent_->set_value(this->buffer_.value(x...)); });

4
esphome/components/esp32_ble_server/ble_service.cpp
View File

@@ -41,6 +41,10 @@ BLECharacteristic *BLEService::create_characteristic(ESPBTUUID uuid, esp_gatt_ch
return characteristic;
}
void BLEService::add_characteristic(BLECharacteristic *characteristic) {
this->characteristics_.push_back(characteristic);
}
void BLEService::do_create(BLEServer *server) {
this->server_ = server;

3
esphome/components/esp32_ble_server/ble_service.h
View File

@@ -31,6 +31,9 @@ class BLEService {
BLECharacteristic *create_characteristic(uint16_t uuid, esp_gatt_char_prop_t properties);
BLECharacteristic *create_characteristic(ESPBTUUID uuid, esp_gatt_char_prop_t properties);
// Add pre-constructed characteristic (used by generated code)
void add_characteristic(BLECharacteristic *characteristic);
ESPBTUUID get_uuid() { return this->uuid_; }
uint8_t get_inst_id() { return this->inst_id_; }
BLECharacteristic *get_last_created_characteristic() { return this->last_created_characteristic_; }

14
esphome/components/esp32_improv/esp32_improv_component.cpp
View File

@@ -38,8 +38,7 @@ void ESP32ImprovComponent::setup() {
});
}
#endif
global_ble_server->on(BLEServerEvt::EmptyEvt::ON_DISCONNECT,
[this](uint16_t conn_id) { this->set_error_(improv::ERROR_NONE); });
global_ble_server->on_disconnect([this](uint16_t conn_id) { this->set_error_(improv::ERROR_NONE); });
// Start with loop disabled - will be enabled by start() when needed
this->disable_loop();
@@ -57,12 +56,11 @@ void ESP32ImprovComponent::setup_characteristics() {
this->error_->add_descriptor(error_descriptor);
this->rpc_ = this->service_->create_characteristic(improv::RPC_COMMAND_UUID, BLECharacteristic::PROPERTY_WRITE);
this->rpc_->EventEmitter<BLECharacteristicEvt::VectorEvt, std::vector<uint8_t>, uint16_t>::on(
BLECharacteristicEvt::VectorEvt::ON_WRITE, [this](const std::vector<uint8_t> &data, uint16_t id) {
if (!data.empty()) {
this->incoming_data_.insert(this->incoming_data_.end(), data.begin(), data.end());
}
});
this->rpc_->on_write([this](std::span<const uint8_t> data, uint16_t id) {
if (!data.empty()) {
this->incoming_data_.insert(this->incoming_data_.end(), data.begin(), data.end());
}
});
BLEDescriptor *rpc_descriptor = new BLE2902();
this->rpc_->add_descriptor(rpc_descriptor);

99
esphome/components/event_emitter/event_emitter.h
View File

@@ -1,5 +1,5 @@
#pragma once
#include <vector>
#include <array>
#include <functional>
#include <limits>
@@ -13,34 +13,31 @@ static constexpr EventEmitterListenerID INVALID_LISTENER_ID = 0;
// EventEmitter class that can emit events with a specific name (it is highly recommended to use an enum class for this)
// and a list of arguments. Supports multiple listeners for each event.
template<typename EvtType, typename... Args> class EventEmitter {
// MaxListeners is the compile-time maximum number of listeners per event type.
template<typename EvtType, size_t MaxListeners, typename... Args> class EventEmitter {
public:
EventEmitterListenerID on(EvtType event, std::function<void(Args...)> listener) {
EventEmitterListenerID listener_id = this->get_next_id_();
// Find or create event entry
EventEntry *entry = this->find_or_create_event_(event);
entry->listeners.push_back({listener_id, listener});
return listener_id;
// Find a free slot in the listeners array
for (auto &entry : this->listeners_) {
if (entry.id == INVALID_LISTENER_ID) {
// Found empty slot
EventEmitterListenerID listener_id = this->get_next_id_();
entry.id = listener_id;
entry.event = event;
entry.callback = std::move(listener);
return listener_id;
}
}
// No free slots - array is full
return INVALID_LISTENER_ID;
}
void off(EvtType event, EventEmitterListenerID id) {
EventEntry *entry = this->find_event_(event);
if (entry == nullptr)
return;
// Remove listener with given id
for (auto it = entry->listeners.begin(); it != entry->listeners.end(); ++it) {
if (it->id == id) {
// Swap with last and pop for efficient removal
*it = entry->listeners.back();
entry->listeners.pop_back();
// Remove event entry if no more listeners
if (entry->listeners.empty()) {
this->remove_event_(event);
}
// Find and remove listener with given id
for (auto &entry : this->listeners_) {
if (entry.id == id && entry.event == event) {
entry.id = INVALID_LISTENER_ID;
entry.callback = nullptr;
return;
}
}
@@ -48,25 +45,19 @@ template<typename EvtType, typename... Args> class EventEmitter {
protected:
void emit_(EvtType event, Args... args) {
EventEntry *entry = this->find_event_(event);
if (entry == nullptr)
return;
// Call all listeners for this event
for (const auto &listener : entry->listeners) {
listener.callback(args...);
for (const auto &entry : this->listeners_) {
if (entry.id != INVALID_LISTENER_ID && entry.event == event) {
entry.callback(args...);
}
}
}
private:
struct Listener {
EventEmitterListenerID id;
std::function<void(Args...)> callback;
};
struct EventEntry {
struct ListenerEntry {
EvtType event;
std::vector<Listener> listeners;
EventEmitterListenerID id{INVALID_LISTENER_ID};
std::function<void(Args...)> callback{nullptr};
};
EventEmitterListenerID get_next_id_() {
@@ -79,38 +70,8 @@ template<typename EvtType, typename... Args> class EventEmitter {
return this->current_id_;
}
EventEntry *find_event_(EvtType event) {
for (auto &entry : this->events_) {
if (entry.event == event) {
return &entry;
}
}
return nullptr;
}
EventEntry *find_or_create_event_(EvtType event) {
EventEntry *entry = this->find_event_(event);
if (entry != nullptr)
return entry;
// Create new event entry
this->events_.push_back({event, {}});
return &this->events_.back();
}
void remove_event_(EvtType event) {
for (auto it = this->events_.begin(); it != this->events_.end(); ++it) {
if (it->event == event) {
// Swap with last and pop
*it = this->events_.back();
this->events_.pop_back();
return;
}
}
}
std::vector<EventEntry> events_;
EventEmitterListenerID current_id_ = 0;
std::array<ListenerEntry, MaxListeners> listeners_{};
EventEmitterListenerID current_id_{0};
};
} // namespace event_emitter