CurrentTimeClient.h

#pragma once
#define min // workaround: nimble's min/max macros conflict with libstdc++
#define max
#include <host/ble_gap.h>
#undef max
#undef min
#include <cstdint>
#include "components/ble/BleClient.h"

namespace Pinetime {
  namespace Controllers {
    class DateTime;

    class CurrentTimeClient : public BleClient {
    public:
      explicit CurrentTimeClient(DateTime& dateTimeController);
      void Init();
      void Reset();
      bool OnDiscoveryEvent(uint16_t connectionHandle, const ble_gatt_error* error, const ble_gatt_svc* service);
      int OnCharacteristicDiscoveryEvent(uint16_t conn_handle, const ble_gatt_error* error, const ble_gatt_chr* characteristic);
      int OnCurrentTimeReadResult(uint16_t conn_handle, const ble_gatt_error* error, const ble_gatt_attr* attribute);

      static constexpr const ble_uuid16_t* Uuid() {
        return &CurrentTimeClient::ctsServiceUuid;
      }

      static constexpr const ble_uuid16_t* CurrentTimeCharacteristicUuid() {
        return &CurrentTimeClient::currentTimeCharacteristicUuid;
      }

      void Discover(uint16_t connectionHandle, std::function<void(uint16_t)> lambda) override;

    private:
      typedef struct __attribute__((packed)) {
        uint8_t year_LSO; // explicit byte ordering to be independent of machine order
        uint8_t year_MSO; // BLE GATT is little endian
        uint8_t month;
        uint8_t dayofmonth;
        uint8_t hour;
        uint8_t minute;
        uint8_t second;
        uint8_t dayofweek;
        uint8_t fractions256; // currently ignored
        uint8_t reason;       // currently ignored, not that any host would set it anyway
      } CtsData;

      static constexpr uint16_t ctsServiceId {0x1805};
      static constexpr uint16_t currentTimeCharacteristicId {0x2a2b};

      static constexpr ble_uuid16_t ctsServiceUuid {.u {.type = BLE_UUID_TYPE_16}, .value = ctsServiceId};
      static constexpr ble_uuid16_t currentTimeCharacteristicUuid {.u {.type = BLE_UUID_TYPE_16}, .value = currentTimeCharacteristicId};

      DateTime& dateTimeController;
      bool isDiscovered = false;
      uint16_t ctsStartHandle;
      uint16_t ctsEndHandle;

      bool isCharacteristicDiscovered = false;
      uint16_t currentTimeHandle;
      std::function<void(uint16_t)> onServiceDiscovered;
    };
  }
}