nRF51 IoT UDP transfer speed

RE: nRF51 IoT UDP transfer speed

Petter Myhre — Fri, 25 Sep 2015 14:35:36 GMT

It is the central device that dictates the connection parameters. I don't think you need to change anything in the IoT example. The change should be done on the central side. We need to figure out what connection interval that is used, and how many packets that are actually transferred in each connection interval. The first you may be able to find by using using the HCI interface, the other is a bit more difficult. I'll talk to some developers and see if we have done any throughput tests. Let me know if you have any new information.

RE: nRF51 IoT UDP transfer speed

Alex — Fri, 25 Sep 2015 10:22:23 GMT

Petter, thank you very much for your reply.

I'm using nRF51 IoT SDK and an iot_ipv6_udp_client example for the implementation of data transfer via UDP connection. I use as a central device the ASUS USB-BT400 usb dongle and PC with Ubuntu with 6lowpan support. I'm trying to evaluate the maximum possible speed of data transmission over the Internet via UDP connection. To receive data on the PC I'm using Python script based on examples from the Nordic. I not found in the iot_ipv6_udp_client example the ability to change connection interval. I also tried to add my own code for that. But this is to no avail.

RE: nRF51 IoT UDP transfer speed

Petter Myhre — Thu, 24 Sep 2015 13:07:58 GMT

How are you testing this? Are you talking about transfer speed over the BLE link or something else? What central device (BLE dongle) are you using? With 7.5 ms connection interval, 6 packets per connection interval and 20 B in each packet the nRF5 can achieve a throughput of 16 kB/s, please see this for more information.