How to increase Data Rate

[Ferhat B]

Hi

We use ble_app_uart_pca10040 app. We have our own board has microcontroller and send data over uart to ble module (bmd350) There is Nrf52832. I want to send 32byte pack and 500pack in sec. Im very far to achive that.

Ferhat

[Ferhat B]

I want to transfer 120bytes one time, is it possible. How can i do it, i coulndt achieve.

[Sigurd]

Yes, smartphones/tablet typically supports between 4-6 packets per connection interval. If the smartphone/tablet supports ATT MTU 158 bytes, then you can set m_ble_nus_max_data_len to 158. This is done automatically for you in the function gatt_evt_handler().

“In soft device document is see for client Att MTU 23 and 7.5ms”. It can be set to up-to 247. See table 2 here.

Q: I want to transfer 120bytes one time, is it possible?

A: Yes, this is possible as long as the smartphone/tablet also support it.

Also see this answer.

[Ferhat B]

Hi Sigurd

I have 20bytes pack and i collect them 120bytes (6*20) and send totaly.
This works fine every 24ms interval.
Bu i need to send 12ms interval evey 120byte pack and its not working vell. Im using ipad air2 for monitring. Its missing packets.

[Ferhat B]

Hi Sigurd, do you have any comment ?

[Sigurd]

Have you turned on DLE(Data length extension) ? What ATT MTU value are you using ? What connection interval value are you getting from the iPad?