NRF_ERROR_DATA_SIZE & sd_ble_evt_get with Streaming Data

RE: NRF_ERROR_DATA_SIZE & sd_ble_evt_get with Streaming Data

Hung Bui — Thu, 22 Jun 2017 07:53:46 GMT

Good that you found the solution, but isn't it true we do the same thing in our SDK ? We have a loop in the event handler intern_softdevice_events_execute() to get all the event out. I don't really understand why it could be a problem. Note that if the application failed to pull the event out, the softdevice will start NACKing the peer device.

RE: NRF_ERROR_DATA_SIZE & sd_ble_evt_get with Streaming Data

jpelo — Wed, 21 Jun 2017 19:35:27 GMT

Fixed this issue; user error. Bug in the way I was looping in the event handler and getting ble events from stack. Problem showed up with more ble traffic because it causes multiple events to be queued up.

RE: NRF_ERROR_DATA_SIZE & sd_ble_evt_get with Streaming Data

jpelo — Wed, 21 Jun 2017 16:01:29 GMT

Yes definitely strange.

I am a peripheral. I have a data characteristic that is 20bytes that I am updating at 100hz. When the central has subscribed to notifications for this data characteristic is when I get this issue. The issue shows up when the central writes to a different characteristic that is also 20bytes. The streaming at 100hz runs fine (data coming into central without issue). From my central, I can read other characteristics and subscribe to other notifications. But as soon as i write this other 20 byte characteristic, i get the nrf_error_data_size error. When streaming on the data characteristic at a slower speed, I can write to the other 20 byte characteristic without problem/error.

i did see this error come up earlier with slow connection parameters and quickly toggling subscribe/unsubscribe (rapid mouse click subscribe/unsubscribe on central). volume of events?

RE: NRF_ERROR_DATA_SIZE & sd_ble_evt_get with Streaming Data

Hung Bui — Wed, 21 Jun 2017 15:50:51 GMT

It sounds a little bit strange that the function complains about the buffer size when it should not be a problem. Could you make a simple program that can demonstrate the issue ? I assume you have the issue on the central side ?