Allow multiple bluetooth proxy connections (#3971)

esphome/components/bluetooth_proxy/bluetooth_connection.h

@@ -0,0 +1,34 @@
+#pragma once
+
+#ifdef USE_ESP32
+
+#include "esphome/components/esp32_ble_client/ble_client_base.h"
+
+namespace esphome {
+namespace bluetooth_proxy {
+
+class BluetoothProxy;
+
+class BluetoothConnection : public esp32_ble_client::BLEClientBase {
+ public:
+  bool gattc_event_handler(esp_gattc_cb_event_t event, esp_gatt_if_t gattc_if,
+                           esp_ble_gattc_cb_param_t *param) override;
+
+  esp_err_t read_characteristic(uint16_t handle);
+  esp_err_t write_characteristic(uint16_t handle, const std::string &data, bool response);
+  esp_err_t read_descriptor(uint16_t handle);
+  esp_err_t write_descriptor(uint16_t handle, const std::string &data);
+
+  esp_err_t notify_characteristic(uint16_t handle, bool enable);
+
+ protected:
+  friend class BluetoothProxy;
+
+  int16_t send_service_{-1};
+  BluetoothProxy *proxy_;
+};
+
+}  // namespace bluetooth_proxy
+}  // namespace esphome
+
+#endif  // USE_ESP32