The heart rate can not be accurately extracted using this library

[Luo-XiuFeng]

I used the following cycles to extract heart rate data: If I print databuf, I'll get a lot of None, which seriously affects my heart rate curve, because IF I draw it, I'll get the following problem: Is it the way I extracted it?

[rommeswi]

You can smooth or extrapolate the data. Some of your data may be missing.