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Write/Read characteristic speed

hamid reza mehrabian
Prodigy 240 points

Hi all...

I am using CC2540MINIDK. I created a new GATT profile for my project. I am using "USBDongle and BTOOL" to send and receive data with my custom UUID.

I defined a 20Byte characteristic that have read and write attribute.
I need to send 3KB from my server to an Android Device in less than 1 sec! is it possible??

I must send about 150 packet to complete it 3KB data.

I tested read/write speed via "USBDongle and BTOOL" , but each 20 byte packet sent about 2 sec!
Is writing data by Notification faster than simple write???
Do i need to use L2CAP????

thanks in advance