message: improve eda in synthetic board
diff: @@ -142,6 +142,7 @@ void SyntheticBoard::read_thread ()
  std::normal_distribution<double> accel_dist (0.0, 0.35);
  std::normal_distribution<double> temperature_dist (36.0, 0.5);
  std::normal_distribution<double> dist_mean_thousand (1000.0, 200.0);
  + std::normal_distribution<double> eda_dist (1.08, 0.01);
  uint64_t seed = std::chrono::high_resolution_clock::now ().time_since_epoch ().count ();
  std::mt19937 mt (static_cast<uint32_t> (seed));
  @@ -171,7 +172,7 @@ void SyntheticBoard::read_thread ()
  package[i + 1 + exg_channels] = accel_dist (mt);
  }
  // eda
  - package[23] = dist_mean_thousand (mt);
  + package[23] = eda_dist (mt);
  // ppg
  package[24] = 5.0 * dist_mean_thousand (mt);
  package[25] = 5.0 * dist_mean_thousand (mt);
  