Image transfer demo

[Blaugranas23]

Hi guys! I have had an issue with Image Transfer Demo project. I use nRF52832 with OV2640 camera. I used installation project process described on the page https://github.com/NordicPlayground/nrf52-ble-image-transfer-demo#softdevice-version. The project was successfully compiled an launched on Nordic. Then i downloaded application for Android "ImageTransferDemo". Connection between Android app and the nRF is successfully established and when i try "Take Picture" from the app transmission of Packets normally executes, but picture doesn't appear into app after receiving packets. What the reason could be? Thanks...

[ovrebekk]

Hi 

What model of phone are you using?

Are you able to take a screenshot of the app after the transfer has stopped?

Best regards
Torbjørn

[Blaugranas23]

Hello! Yes, sure! I use "ASUS ZENFONE 5 ze620kl"

[ovrebekk]

Hi

Your board and connections look good, that shouldn't be the problem. 

I will order some of the modules and do some testing on my own, but unless I can reproduce the problem it is hard to find the solution. 

Do you have some kind of Bluetooth sniffer so you can take a trace of the communications?

Best regards
Torbjørn

[Blaugranas23]

Hi!

Thanks a lot, i'll be looking forward to your testing results.

Yes, i have a BLE sniffer  PCA10031 dongle, i'll try to set up it on my PC and find out what particular data is sent in packets.

Best regards!

[ovrebekk]

Hi

It will take some time unfortunately, as it takes a while to get the modules shipped to Norway ;)

Once you have some sniffer results please share them, it should be helpful in debugging the issue. 

Best regards
Torbjørn

[Blaugranas23]

Good day! I have caught some packets by sniffer during image transfer, it seems actata are transferred from peripheral device: Sequence of Empty Data PDU packets is sent constantly, and after "Take Picture" action only one ATT packet "Rcvd Exchange MTU Response" is displayed on WireShark screen. The length of this one seems to be 255 bytes, but in the lowest window we can see just 33. I'm sending you a screenshot of transferring packets during Image Transfer Exchange.   

[ovrebekk]

Hi

So you don't see any image data being sent at all?

Normally the MTU exchange will happen 5-10 seconds after connection establishment, and should not be related to when you press the take picture button. 

Best regards
Torbjørn