Maximum throughput with new nRF51 Dongle

RE: Maximum throughput with new nRF51 Dongle

Wass0392 — Wed, 22 Apr 2015 18:56:32 GMT

i have one more question for you, the database discovery module provided by the SDK only supports up to 3 characteristics per service with a maximum of 2 services. If i wanted to created a central application using the Dongle as a central client, how then can i recieve 6 packets per connection? would i have to split my data into two services, 3 characteristics a piece? any infomation would be a big help, thanks

RE: Maximum throughput with new nRF51 Dongle

Asbjørn — Mon, 23 Feb 2015 08:50:28 GMT

The supported data rates are the on air data rate, you have to take into account overhead of the protocol and package into this. So for BLE, there are timing restrictions limiting the amount of packages you can send and hence you will not get the full 1 Mbps throughput, but the on air data is 1 Mbps. Which mean that 1 bit takes 1 us to send. But due to overhead and timing, you are not able to send 1 bit every 1 us continuously, hence you won't get 1 Mbps of your data through.

RE: Maximum throughput with new nRF51 Dongle

Wass0392 — Wed, 18 Feb 2015 19:44:35 GMT

thanks again, one last thing if you dont mind? The specification for the nRF51822 specfies supported data rates of 250kbps, 1mbps and 2mbps. Based on what you have told me this maximum of 6 packet intervals will only yield a data rate of upto 128kbps, How is it then possible to achieve data rates of 1mpbs and 2 mbps?

RE: Maximum throughput with new nRF51 Dongle

Asbjørn — Wed, 11 Feb 2015 17:09:36 GMT

That is correct.

RE: Maximum throughput with new nRF51 Dongle

Wass0392 — Fri, 06 Feb 2015 11:36:14 GMT

thank you for the quick response. Just to summarise and to see that I understand, using the nRF51 DK as a peripheral and the Dongle as the central it will support up to 6 packets per connection using the MEFW.10 firmware?

RE: Maximum throughput with new nRF51 Dongle

Asbjørn — Thu, 05 Feb 2015 15:07:46 GMT

It depends on what you are connection towards. The nRF51 radio as a Bluetooth peripheral can support up to 6 packages per connection interval if the central it connects to accepts this. The nRF51 dongle in master control panel with the MEFW .10 firmware will support up to 6 packages per connection interval in Master control panel.