Why BLE disconnection occurs while sending large data?

RE: Why BLE disconnection occurs while sending large data?

ovrebekk — Thu, 24 Aug 2017 13:54:17 GMT

Hi Mani

The problem seems to be that you some times have a very high rate of UART activity, followed by periods of less activity.
The only way I can see to properly solve this issue is to have a huge UART buffer on the transmitter side (that would be the RX buffer of the UART, since you are receiving over the UART and transmitting over the radio).
Could you try to set the UART RX buffer to something like 16000 bytes and see if it solves the issue?
The nRF52832 has 64kB of RAM in total, and most of that should be available to the application, so you might try to go all the way up to 32kB of RAM for the UART.

Best regards

RE: Why BLE disconnection occurs while sending large data?

Mani — Thu, 17 Aug 2017 10:37:39 GMT

I have attached the video in the following link : link text

Tab 1: Data from Device under test Tab2: Receiver
Both side has nRF52 Evaluation board.

And my code is in link text

In that video you can find that there is huge loss and also board lost the connection in between the process.

RE: Why BLE disconnection occurs while sending large data?

ovrebekk — Thu, 17 Aug 2017 07:33:27 GMT

Sure, if you have a video to share that might be helpful :)

RE: Why BLE disconnection occurs while sending large data?

Mani — Wed, 16 Aug 2017 07:41:02 GMT

Even with this code also my device is getting restarted. I can share the video also if you want..

RE: Why BLE disconnection occurs while sending large data?

ovrebekk — Mon, 14 Aug 2017 10:55:42 GMT

Hi Mani

Could you try the attached example?

I tried to change the buffering a bit, so that the example would not assert on a BLE buffer overflow:
nrf52-ble-app-uart-flow-control.zip

Best regards
Torbjørn