public async Task Put(TmpSensorViewModel model)
        {
            var relay = await set.FirstOrDefaultAsync(r => r.Id == model.Id);

            relay.Name  = model.Name ?? relay.Name;
            relay.Value = model.Value ?? relay.Value;
            relay.Max   = model.Max ?? relay.Max;
            relay.Min   = model.Min ?? relay.Min;

            await _context.SaveChangesAsync();
        }
 public async Task Post(TmpSensorViewModel model)
 {
     set.Add(new TmpSensor
     {
         Max   = model.Max.Value,
         Name  = model.Name,
         Min   = model.Min.Value,
         Value = model.Value.Value
     });
     await _context.SaveChangesAsync();
 }