diff --git a/esphome/components/ble_client/ble_client.cpp b/esphome/components/ble_client/ble_client.cpp
index 7bef0d652c..d06c3c4cad 100644
--- a/esphome/components/ble_client/ble_client.cpp
+++ b/esphome/components/ble_client/ble_client.cpp
@@ -113,6 +113,7 @@ void BLEClient::gattc_event_handler(esp_gattc_cb_event_t event, esp_gatt_if_t es
     }
     case ESP_GATTC_OPEN_EVT: {
       ESP_LOGV(TAG, "[%s] ESP_GATTC_OPEN_EVT", this->address_str().c_str());
+      this->conn_id = param->open.conn_id;
       if (param->open.status != ESP_GATT_OK) {
         ESP_LOGW(TAG, "connect to %s failed, status=%d", this->address_str().c_str(), param->open.status);
         this->set_states_(espbt::ClientState::IDLE);
@@ -122,7 +123,10 @@ void BLEClient::gattc_event_handler(esp_gattc_cb_event_t event, esp_gatt_if_t es
     }
     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;
+      if (this->conn_id != param->connect.conn_id) {
+        ESP_LOGD(TAG, "[%s] Unexpected conn_id in CONNECT_EVT: param conn=%d, open conn=%d",
+                 this->address_str().c_str(), param->connect.conn_id, this->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=%x", ret);
@@ -183,9 +187,10 @@ void BLEClient::gattc_event_handler(esp_gattc_cb_event_t event, esp_gatt_if_t es
                  descr->uuid.to_string().c_str());
         break;
       }
-      uint8_t notify_en = 1;
-      auto status = esp_ble_gattc_write_char_descr(this->gattc_if, this->conn_id, descr->handle, sizeof(notify_en),
-                                                   &notify_en, ESP_GATT_WRITE_TYPE_RSP, ESP_GATT_AUTH_REQ_NONE);
+      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, "esp_ble_gattc_write_char_descr error, status=%d", status);
       }