ble uart app packet lose

[Fiske]

I use the ble uart app to receive the data from mobile phone. The data packet size is 20 byte. If I transmit the packet one by one without adding delay, is it possible that there will be packet lose in receiver side.

[Fiske]

Is it true if the mobile application use write command, there will be possible packet lose. However, if the mobile application use write request, there will be no packet lose.