how to limit the number of packet in each connection event?

RE: how to limit the number of packet in each connection event?

Einar Thorsrud — Mon, 06 Dec 2021 13:39:51 GMT

I am glad to hear it worked. Thanks for letting me know 🙂

RE: how to limit the number of packet in each connection event?

roamv — Mon, 06 Dec 2021 13:27:42 GMT

By using SDC_MAX_CONN_EVENT_LEN_DEFAULT and set it to 2500, the master is working perfectly now.

Very appreciate your help!

Thanks again!

RE: how to limit the number of packet in each connection event?

roamv — Mon, 06 Dec 2021 10:18:46 GMT

Got you, I'll have a try and let you know the result.

Thanks!

RE: how to limit the number of packet in each connection event?

Einar Thorsrud — Mon, 06 Dec 2021 09:49:34 GMT

Hi,

This configuration were only in earlier SoftDevice versions, and is no longer available. In recent SoftDevice versions you control this by configuring the event length, and that is also what you need to do in the nRF Connect SDK. In that case you can use SDC_MAX_CONN_EVENT_LEN_DEFAULT and set that to a low value.

Another alternative could be to send data as indications instead of other methods. With indications there are never more than one per connection event (unlike with notifications).

RE: how to limit the number of packet in each connection event?

roamv — Mon, 06 Dec 2021 09:01:14 GMT

it's from here: devzone.nordicsemi.com/.../limit-packet-number-per-connection-interval

RE: how to limit the number of packet in each connection event?

roamv — Mon, 06 Dec 2021 08:59:33 GMT

Hi Einar Thorsrud, thanx for your reply.

I read from an other thread said sd_ble_opt_set can be used to limit the sender(in my project they are peripherals) to send only 1 packet in each connection event.

If I ask my customer to change the peripherals chips to nrf52832, is that possible to use sd_ble_opt_set to fullfill the requirement?

By the way, I'm developing under Zephyr, if this can work, which API should be used instead of sd_ble_opt_set?

Thank you!

RE: how to limit the number of packet in each connection event?

Einar Thorsrud — Mon, 06 Dec 2021 08:33:53 GMT

Hi,

There is no API for limiting this explicitly. What you can do however, is to configure a short event length. It is only possible/allowed to send more packets within the connection event, and if you make the event short enough to only fit one packet then that should do the trick (though if you need to fit one large packet it may be possible to get e.g. two very small packets through in the same event length).