BLE Throughput with S112

RE: BLE Throughput with S112

marklander — Wed, 14 Aug 2024 10:12:52 GMT

Q1: no i am just connecting mobile as central to my board as peripheral, what I see also is that for example if I send max interval of 30 and min of 14 it seems settings the average value in the end so 22.

I will check better my config parameters anyway... I tried on an older asus zenfone with android 9 and also with a samsung a12 with android 13.

Q2: will check i was just asking if it's a normal behaviour or not.

RE: BLE Throughput with S112

billtsai — Wed, 14 Aug 2024 09:54:12 GMT

Q1: My android phone is pixel and it can run at 7.5m sec interval. Is your phone connecting with other ble or bt device?

Q2: I'm not sure. But you can find the channel index in the packet.

RE: BLE Throughput with S112

marklander — Wed, 14 Aug 2024 07:26:31 GMT

Ok! I am using Rust, but i think it's correctly setted on my side ( peripheral )

RE: BLE Throughput with S112

billtsai — Wed, 14 Aug 2024 05:21:49 GMT

Just set the connection event length parameter in sdk_config.h.

You can refer to S112 spec

https://infocenter.nordicsemi.com/topic/sds_s112/SDS/s1xx/ble_data_throughput/ble_data_throughput.html?cp=5_7_0_0_16

RE: BLE Throughput with S112

marklander — Mon, 12 Aug 2024 16:34:42 GMT

Thanks billtsai , sounds clear will try! A question on connection event length which is supported by Softdevice 112, do I need to set this parameter before central connection or after it's connected i need to request an update?

And by the way in your opinion what could be a realistic data rate i can reach? From nrf toolbox I copy and paste 22.5 Kb of text in roughly 12 secs...I think I can get higher also without data extension...

Another doubt, connection event length is just used by the device activating it right? I mean i activate it on my peripheral, but this does not mean that it is used also by central, i don't see any exchange of data about this settings between devices.

RE: BLE Throughput with S112

billtsai — Mon, 12 Aug 2024 02:55:33 GMT

Hi,

Host will decide the connection interval.

If host has new connection itnerval, the device will receive BLE_GAP_EVT_CONN_PARAM_UPDATE event.

You can add BLE_GAP_EVT_CONN_PARAM_UPDATE in ble_evt_handler and the new connection params will in p_ble_evt->evt.gap_evt.params.conn_param_update.conn_params.

If connection interval is not meet your request, you can use sd_ble_gap_conn_param_update to request host updates connection parameters.