InfiniTime/src/components/ble/MotionService.cpp

#include "MotionService.h"
#include "components/motion//MotionController.h"
#include "systemtask/SystemTask.h"

using namespace Pinetime::Controllers;

namespace {
  // 0002yyxx-78fc-48fe-8e23-433b3a1942d0
  constexpr ble_uuid128_t CharUuid(uint8_t x, uint8_t y) {
    return ble_uuid128_t{
      .u = {.type = BLE_UUID_TYPE_128},
      .value =  { 0xd0, 0x42, 0x19, 0x3a, 0x3b, 0x43, 0x23, 0x8e, 0xfe, 0x48, 0xfc, 0x78, x, y, 0x02, 0x00 }
    };
  }

  // 00020000-78fc-48fe-8e23-433b3a1942d0
  constexpr ble_uuid128_t BaseUuid() {
    return CharUuid(0x00, 0x00);
  }

  constexpr ble_uuid128_t motionServiceUuid {BaseUuid()};
  constexpr ble_uuid128_t stepCountCharUuid {CharUuid(0x01, 0x00)};
  constexpr ble_uuid128_t motionValuesCharUuid {CharUuid(0x02, 0x00)};

  int MotionServiceCallback(uint16_t conn_handle, uint16_t attr_handle, struct ble_gatt_access_ctxt* ctxt, void* arg) {
    auto* motionService = static_cast<MotionService*>(arg);
    return motionService->OnStepCountRequested(conn_handle, attr_handle, ctxt);
  }
}

// TODO Refactoring - remove dependency to SystemTask
MotionService::MotionService(Pinetime::System::SystemTask& system, Controllers::MotionController& motionController)
  : system {system},
    motionController {motionController},
    characteristicDefinition {{.uuid = &stepCountCharUuid.u,
                               .access_cb = MotionServiceCallback,
                               .arg = this,
                               .flags = BLE_GATT_CHR_F_READ | BLE_GATT_CHR_F_NOTIFY,
                               .val_handle = &stepCountHandle},
                              {.uuid = &motionValuesCharUuid.u,
                               .access_cb = MotionServiceCallback,
                               .arg = this,
                               .flags = BLE_GATT_CHR_F_READ | BLE_GATT_CHR_F_NOTIFY,
                               .val_handle = &motionValuesHandle},
                              {0}},
    serviceDefinition {
      {
       .type = BLE_GATT_SVC_TYPE_PRIMARY,
       .uuid = &motionServiceUuid.u,
       .characteristics = characteristicDefinition
      },
      {0},
    } {
  // TODO refactor to prevent this loop dependency (service depends on controller and controller depends on service)
  motionController.SetService(this);
}

void MotionService::Init() {
  int res = 0;
  res = ble_gatts_count_cfg(serviceDefinition);
  ASSERT(res == 0);

  res = ble_gatts_add_svcs(serviceDefinition);
  ASSERT(res == 0);
}

int MotionService::OnStepCountRequested(uint16_t connectionHandle, uint16_t attributeHandle, ble_gatt_access_ctxt* context) {
  if (attributeHandle == stepCountHandle) {
    NRF_LOG_INFO("Motion-stepcount : handle = %d", stepCountHandle);
    uint32_t buffer = motionController.NbSteps();

    int res = os_mbuf_append(context->om, &buffer, 4);
    return (res == 0) ? 0 : BLE_ATT_ERR_INSUFFICIENT_RES;
  } else if(attributeHandle == motionValuesHandle) {
    int16_t buffer[3] = { motionController.X(), motionController.Y(), motionController.Z() };

    int res = os_mbuf_append(context->om, buffer, 3 * sizeof(int16_t));
    return (res == 0) ? 0 : BLE_ATT_ERR_INSUFFICIENT_RES;
  }
  return 0;
}

void MotionService::OnNewStepCountValue(uint8_t stepCount) {
  if(!stepCountNoficationEnabled) return;

  uint32_t buffer = stepCount;
  auto* om = ble_hs_mbuf_from_flat(&buffer, 4);

  uint16_t connectionHandle = system.nimble().connHandle();

  if (connectionHandle == 0 || connectionHandle == BLE_HS_CONN_HANDLE_NONE) {
    return;
  }

  ble_gattc_notify_custom(connectionHandle, stepCountHandle, om);
}
void MotionService::OnNewMotionValues(int16_t x, int16_t y, int16_t z) {
  if(!motionValuesNoficationEnabled) return;

  int16_t buffer[3] = { motionController.X(), motionController.Y(), motionController.Z() };
  auto* om = ble_hs_mbuf_from_flat(buffer, 3 * sizeof(int16_t));

  uint16_t connectionHandle = system.nimble().connHandle();

  if (connectionHandle == 0 || connectionHandle == BLE_HS_CONN_HANDLE_NONE) {
    return;
  }

  ble_gattc_notify_custom(connectionHandle, motionValuesHandle, om);
}

void MotionService::SubscribeNotification(uint16_t connectionHandle, uint16_t attributeHandle) {
  if(attributeHandle == stepCountHandle)
    stepCountNoficationEnabled = true;
  else if(attributeHandle == motionValuesHandle)
    motionValuesNoficationEnabled = true;
}

void MotionService::UnsubscribeNotification(uint16_t connectionHandle, uint16_t attributeHandle) {
  if(attributeHandle == stepCountHandle)
    stepCountNoficationEnabled = false;
  else if(attributeHandle == motionValuesHandle)
    motionValuesNoficationEnabled = false;
}