Sending images over BLE

Question

Hi,
I'm designing an Android application that has to receive VGA images from de nRF51 acting as the server. Is GATT the best way to accomplish that? If so, as it is necessary to fragment the data in several chunks, do I have to worry about the order in which the characteristic notifications arrive? 
 Regards.

Hung Bui · Accepted Answer

Hi Ignacio, 
 A file can be send via GATT. Notification packet will be ACK-ed on link layer, and according to spec, the order of the received packets should be the same as the order of the packets sent. You should be fine using notification. 
 You can also think of using write long (max 512 bytes) which is supported from Softdevice v6.0.0. However, I haven't tested if write long is supported on an Android server. 
 Added:
You can also have a look at this case: http://devzone.nordicsemi.com/index.php/s110-sending-multiple-notifications-per-connection-event which has some related questions.