SDK16.0 NUS service sometimes connecting timeout

[roy yao]

Hi,

    I am using SDK16.0(ble_app_uart) program to sending dates between the phone and board.When I use my iphone xs max,it works on well.But it come out some faults when it connecting iphone 6s.Plese tell me how can I change my code to fix it.

[roy yao]

I use sniffer to catch some package,after GATT primary service declaration,disconnect