Problems transfering image file to BLE device from app on iPhone

RE: Problems transfering image file to BLE device from app on iPhone

Thomas R — Fri, 09 Dec 2022 12:53:47 GMT

Thanks again, Torbjørn! I've passed it on :-)

RE: Problems transfering image file to BLE device from app on iPhone

ovrebekk — Fri, 09 Dec 2022 09:26:27 GMT

Hi Thomas

You welcome 🙂

You might want to alert him to our iOS reference applications and Bluetooth libraries as well, available here:
https://github.com/orgs/NordicPlayground/repositories?q=ios&type=all&language=&sort=

They can be used as a reference and basis for creating your own Bluetooth applications.

Best regards
Torbjørn

RE: Problems transfering image file to BLE device from app on iPhone

Thomas R — Thu, 08 Dec 2022 17:29:05 GMT

Hi Torbjørn,

And thanks a lot for your thorough answer! Yes, your description is correct. I have forwarded your answer to our app developer and hope it will be of help.

All the best,

Thomas

RE: Problems transfering image file to BLE device from app on iPhone

ovrebekk — Thu, 08 Dec 2022 11:24:43 GMT

Hi Thomas

It is quite strange that the data is getting lost. The Bluetooth link layer should ensure that all packets go through, whether you send with or without response.

Are you saying it works fine to use withoutResponse when sending from a devkit, and that you get the higher speed without any data getting lost?

If that is the case it doesn't seem like the issue is on the peripheral side. I wouldn't expect iOS to drop packets either, but possibly there is something wrong on the app side.
I will check with the app developers if there is some risk of overloading the buffers on the iOS side, possibly some care has to be taken in the app not to send data too fast.

To investigate you could always capture a Bluetooth sniffer trace, using the nRF Sniffer for instance. Then you should see pretty clearly where the data is getting lost.

Best regards
Torbjørn