feat: support ble_client that use security w/o pin codes (#3320)

esphome/components/ble_client/ble_client.cpp

@@ -118,16 +118,21 @@ void BLEClient::gattc_event_handler(esp_gattc_cb_event_t event, esp_gatt_if_t es
         this->set_states_(espbt::ClientState::IDLE);
         break;
       }
-      this->conn_id = param->open.conn_id;
+      break;
-      auto ret = esp_ble_gattc_send_mtu_req(this->gattc_if, param->open.conn_id);
+    }
+    case ESP_GATTC_CONNECT_EVT: {
+      ESP_LOGV(TAG, "[%s] ESP_GATTC_CONNECT_EVT", this->address_str().c_str());
+      this->conn_id = param->connect.conn_id;
+      auto ret = esp_ble_gattc_send_mtu_req(this->gattc_if, param->connect.conn_id);
       if (ret) {
-        ESP_LOGW(TAG, "esp_ble_gattc_send_mtu_req failed, status=%d", ret);
+        ESP_LOGW(TAG, "esp_ble_gattc_send_mtu_req failed, status=%x", ret);
       }
       break;
     }
     case ESP_GATTC_CFG_MTU_EVT: {
       if (param->cfg_mtu.status != ESP_GATT_OK) {
-        ESP_LOGW(TAG, "cfg_mtu to %s failed, status %d", this->address_str().c_str(), param->cfg_mtu.status);
+        ESP_LOGW(TAG, "cfg_mtu to %s failed, mtu %d, status %d", this->address_str().c_str(), param->cfg_mtu.mtu,
+                 param->cfg_mtu.status);
         this->set_states_(espbt::ClientState::IDLE);
         break;
       }
@@ -139,7 +144,7 @@ void BLEClient::gattc_event_handler(esp_gattc_cb_event_t event, esp_gatt_if_t es
       if (memcmp(param->disconnect.remote_bda, this->remote_bda, 6) != 0) {
         return;
       }
-      ESP_LOGV(TAG, "[%s] ESP_GATTC_DISCONNECT_EVT", this->address_str().c_str());
+      ESP_LOGV(TAG, "[%s] ESP_GATTC_DISCONNECT_EVT, reason %d", this->address_str().c_str(), param->disconnect.reason);
       for (auto &svc : this->services_)
         delete svc;  // NOLINT(cppcoreguidelines-owning-memory)
       this->services_.clear();
@@ -201,6 +206,32 @@ void BLEClient::gattc_event_handler(esp_gattc_cb_event_t event, esp_gatt_if_t es
   }
 }
 
+void BLEClient::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, "ESP_GAP_BLE_SEC_REQ_EVT %x", 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, "auth complete. remote BD_ADDR: %s", format_hex(bd_addr, 6).c_str());
+      if (!param->ble_security.auth_cmpl.success) {
+        ESP_LOGE(TAG, "auth fail reason = 0x%x", param->ble_security.auth_cmpl.fail_reason);
+      } else {
+        ESP_LOGV(TAG, "auth success. address type = %d auth mode = %d", 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 BLEClient::parse_char_value(uint8_t *value, uint16_t length) {

esphome/components/ble_client/ble_client.h

@@ -11,6 +11,7 @@
 #include <esp_gap_ble_api.h>
 #include <esp_gattc_api.h>
 #include <esp_bt_defs.h>
+#include <esp_gatt_common_api.h>
 
 namespace esphome {
 namespace ble_client {
@@ -86,6 +87,7 @@ class BLEClient : public espbt::ESPBTClient, public Component {
 
   void gattc_event_handler(esp_gattc_cb_event_t event, esp_gatt_if_t gattc_if,
                            esp_ble_gattc_cb_param_t *param) override;
+  void gap_event_handler(esp_gap_ble_cb_event_t event, esp_ble_gap_cb_param_t *param) override;
   bool parse_device(const espbt::ESPBTDevice &device) override;
   void on_scan_end() override {}
   void connect() override;

esphome/components/esp32_ble_tracker/esp32_ble_tracker.cpp

@@ -262,6 +262,9 @@ void ESP32BLETracker::real_gap_event_handler_(esp_gap_ble_cb_event_t event, esp_
     default:
       break;
   }
+  for (auto *client : global_esp32_ble_tracker->clients_) {
+    client->gap_event_handler(event, param);
+  }
 }
 
 void ESP32BLETracker::gap_scan_set_param_complete_(const esp_ble_gap_cb_param_t::ble_scan_param_cmpl_evt_param &param) {

esphome/components/esp32_ble_tracker/esp32_ble_tracker.h

@@ -155,6 +155,7 @@ class ESPBTClient : public ESPBTDeviceListener {
  public:
   virtual void gattc_event_handler(esp_gattc_cb_event_t event, esp_gatt_if_t gattc_if,
                                    esp_ble_gattc_cb_param_t *param) = 0;
+  virtual void gap_event_handler(esp_gap_ble_cb_event_t event, esp_ble_gap_cb_param_t *param) = 0;
   virtual void connect() = 0;
   void set_state(ClientState st) { this->state_ = st; }
   ClientState state() const { return state_; }