Bluetooth symbol length

[yongyuan wang]

Hi,
I am now doing a project that use a sdr to capture the Bluetooth signal from the Lopy4. I want to know if this board transmits an empty packet in the advertisement channel when I use the function:

BT = Bluetooth()
BT.set_advertisement()
BT.advertise(True)

And if it is the case, can I consider that the packet duration will become 44us as defined in the specification.

Besides, I also want to ask questions about symbols in Bluetooth. The specification says in Bluetooth 1E, the packet is transmitted 1M symbols /s and the preamble of the packet is 01010101(8 bits in total), does that mean if my sample rate is 10M samples /s, every 1 symbol transmitted corresponds to 10 samples I sampled.

Thanks for your time

[yongyuan wang]

In addition, I am not sure what is the samples per symbol of the Bluetooth signal in Lopy4. I noticed that I can change this value when I use matlab example to generate Bluetooth signal.