canSendWriteWithoutResponse maybe always false

[zdf]

Dear all,

I use the demo (https://github.com/NordicSemiconductor/IOS-nRF-Toolbox)
when I send large file, after some times, the canSendWriteWithoutResponse maybe always false, and auto disconnected

this is my code, any help thx

[Amanda Hsieh]

Hi, 

We are looking into this case and will reply later. 

Regards,
Amanda

[zdf]

Thx，I look forward to your reply

[Aleksander Nowakowski]

Hello,

From our experience you may safely send ~16-20 packets without checking `canSendWriteWithoutResponse`. If you want to send more you need to check this flag before each write. When you'll get false, you need to wait for the `periphearIsReady(toSendWriteWithoutRequest:)` method: https://developer.apple.com/documentation/corebluetooth/cbperipheraldelegate/2874034-peripheralisready.

Also, from our experience, for some reason the initial call to `canSendWriteWithoutResponse` always returns false, but we send anyway.

[zdf]

Now i have write data in periphearIsReady, also canSendWriteWithoutResponse change to false not in initial, but in after send some times