iPhone 4S - BLE data transfer speed

Question

I\'ve been tinkering around with the BLE (Bluetooth Low Energy) connectivity classes quiet a bit lately and haven\'t been able to make it transfer data any faster than 1KB /

Answer 1

see at the guidlines of apple and you will see that a connection update request is required to speed up your connection.

https://developer.apple.com/hardwaredrivers/BluetoothDesignGuidelines.pdf

I have min=20ms max 40 ms

I hope I could help

Roman

Answer 2

If you are able to use higher MTU size (negotiated by the iOS) then you would be able to increase the bandwidth even more, because there is a 4 byte L2CAP header and a 3 byte ATT header that wouldn't be transmitted more than in one packet.

If you are able to transmit 6 packets pr connection interval, then you would be able to put in 35 byte extra per connection interval (the 7 byte header would still be there for the first packet) The MTU size could also be split over several connection intervals, increasing the throughput with 7 more bytes pr connection interval. (Just takes longer time to assemble the packet again.) The max MTU size allowed by ATT is 515 bytes (Max size of att is 512 bytes + 3 byte header for opcode + handle)