ble_nus_data_send giving error no 19 .

https://devzone.nordicsemi.com/f/nordic-q-a/80125/want-to-achieve-1-2-mbps-through-ble

Issue is in this link is not properly addressed . I want to work on BLE with good data rate , I am sending data to mobile phone . Is it possible to achieve 1.4Mbps with the mobile phone .

When i try to send data on less delay it will give me error no 19 . Please guide me to sort this out . I will be very thankful to you .  

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