ble_app_uart is too slow for IOS,how to fix it?

[qoboty]

I use ble_app_uart of IOS,but the Tx speed is about 200B/s(send 20B for 100ms), why ? how to speed up to 20KB/s ? Thank you!

[Hieu]

I don't think you can send 20 Bytes in 5ms. The nRF51 SDK is limited to an absolute minimum connection interval of 7.5ms. May I ask how you measured those value?