RE: Different PCA10059 Throughput on different computers

ovrebekk — Fri, 08 Oct 2021 09:25:46 GMT

It is odd that there would be such a big difference, but there are obviously various factors that can affect both USB and wireless performance.

1) Depending on the USB configuration on the different PC's there could be delays in the USB communication, if for instance the slow computer has a lot of devices connected to the USB bus. Is a USB hub used in either case, and do you know how many other USB devices are present?

2) Does either computer have any USB3 devices connected?
USB3 is running at a frequency which causes a lot of noise in the 2.4GHz band (used by Bluetooth), and if you have such a device running there could be significant delays in the Bluetooth communication between the dongle and the peripheral.

For clarity, are you using Notifications or Indications to send data?
If you care about throughput it is a lot more efficient to send Notifications, since you can queue multiple packets before getting a response.

Do you have a spare DK or dongle so you can do some testing with the nRF Sniffer?
It could be interesting if the slow down can be caused by the Bluetooth connection, or if it is all down to the USB communication.

Best regards
Torbjørn