ble-server.h

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#pragma once
 
#include "Arduino.h"
#include <NimBLEDevice.h>
#include <array>
 
#define BLE_NAME "ESP32"
 
// BLE Service for Configuration
#define BLE_SERVICE_INPUT_UUID                      "76847a0a-2748-4fda-bcd7-74425f0e4a10"
#define BLE_CHARAKTERISTIK_DEVICE_POSITION_UUID     "76847a0a-2748-4fda-bcd7-74425f0e4a11"
#define BLE_DESCRIPTOR_DEVICE_POSITION_UUID         "76847a0a-2748-4fda-bcd7-74425f0e4a12"
#define BLE_CHARAKTERISTIK_SAVE_CONFIG_UUID         "76847a0a-2748-4fda-bcd7-74425f0e4a13"
#define BLE_DESCRIPTOR_SAVE_CONFIG_UUID             "76847a0a-2748-4fda-bcd7-74425f0e4a14"
 
// BLE Service for Device-Information
#define BLE_SERVICE_OUTPUT_UUID                     "76847a0a-2748-4fda-bcd7-74425f0e4a20"
#define BLE_CHARAKTERISTIK_ANCHOR_POSITIONS_UUID    "76847a0a-2748-4fda-bcd7-74425f0e4a21"
#define BLE_DESCRIPTOR_ANCHOR_POSITIONS_UUID        "76847a0a-2748-4fda-bcd7-74425f0e4a22"
#define BLE_CHARAKTERISTIK_OWN_POSITION_UUID        "76847a0a-2748-4fda-bcd7-74425f0e4a23"
#define BLE_DESCRIPTOR_OWN_POSITION_UUID            "76847a0a-2748-4fda-bcd7-74425f0e4a24"
 
/*BLE Advertising-Intervalle*/
#define BLE_MIN_INTERVAL 0x06
#define BLE_MAX_INTERVAL 0x12
 
class BleServer
{
public:
  BleServer(){};
 
  void init_server();
 
  std::string read_value(const std::string uuid);
 
  void send_value(std::string uuid, const std::string data);
 
  size_t getConnectedCount() { return this->pServer->getConnectedCount(); };
 
private:
  BLEServer *pServer;                      
  BLEAdvertising *pAdvertising;            
  std::list<BLEService *> mServices;       
  struct Characteristic
  {
      std::string name;                
      std::string characteristic_uuid; 
      std::string descriptor_uuid;     
  };
 
  struct Service
  {
      std::string uuid;                          
      const std::array<Characteristic, 2> characteristics; 
  };
 
  /*This Array structure shows the Service-&Characteristic-Architecture of the BLE Connection*/
  const std::array<Service, 2> my_services{
      Service{
        uuid : BLE_SERVICE_INPUT_UUID, 
        characteristics : {
          Characteristic{name : "anchor position [i.e. {\"x\":1,\"y\":2,\"z\":3}]", characteristic_uuid : BLE_CHARAKTERISTIK_DEVICE_POSITION_UUID, descriptor_uuid : BLE_DESCRIPTOR_DEVICE_POSITION_UUID},
          Characteristic{name : "send \"1\" for saving config", characteristic_uuid : BLE_CHARAKTERISTIK_SAVE_CONFIG_UUID, descriptor_uuid : BLE_DESCRIPTOR_SAVE_CONFIG_UUID},      
        }
      },
 
      Service{
        uuid : BLE_SERVICE_OUTPUT_UUID, 
        characteristics : {
          Characteristic{name : "Anchor Positions [Output only]", characteristic_uuid : BLE_CHARAKTERISTIK_ANCHOR_POSITIONS_UUID, descriptor_uuid : BLE_DESCRIPTOR_ANCHOR_POSITIONS_UUID}, 
          Characteristic{name : "my position [i.e. x, y, z]", characteristic_uuid : BLE_CHARAKTERISTIK_OWN_POSITION_UUID, descriptor_uuid : BLE_DESCRIPTOR_OWN_POSITION_UUID},
        }
      }
  };
 
  void add_Characteristic(BLEService *service, BleServer::Characteristic characteristic);
 
  void init_services();
};