Speed up caracteristic reading

RE: Speed up caracteristic reading

Hung Bui — Fri, 24 Jul 2020 09:09:03 GMT

Yes, you need a 2nd dev board for it , the dongle wouldn't work. And it can run on Linux as far as I know (wireshark application)

RE: Speed up caracteristic reading

Olfox — Thu, 23 Jul 2020 15:17:27 GMT

yes i have seen your first proposal. but it seems we need to have a second dev board or dongle to it ? it can not be only windows pc ?

RE: Speed up caracteristic reading

Hung Bui — Thu, 23 Jul 2020 14:33:48 GMT

Good to hear. You can monitor the NRF_BLE_GATT_EVT_ATT_MTU_UPDATED event to get the ATT_MTU updated.

You can also use a sniffer to capture what happens over the air. It can give you a lot of information.

RE: Speed up caracteristic reading

Olfox — Thu, 23 Jul 2020 10:55:36 GMT

Hi Hung,

Thanks for your advise, i reduce from 100 -200 to 10-20 and it is much more fast ! How to kow how many byte per packet are transfered and is it possible de change it ? it could may be again increase the data rate ?

RE: Speed up caracteristic reading

Hung Bui — Wed, 22 Jul 2020 13:30:54 GMT

Hi Florian,

Have you tried to reduce the connection interval ? Usually it's the MIN_CONN_INTERVAL and MAX_CONN_INTERVAL you set in main.c

Try putting it down to 20ms for example.

How did you send the data ? Have you made sure you filled in all the buffer when sending data ?

I would suggest to capture a sniffer trace so we can get to understand what's going on over the air.