BLE UART (NUS), altering MTU and faster interval

RE: BLE UART (NUS), altering MTU and faster interval

TF mulder — Thu, 10 Feb 2022 16:34:58 GMT

Ok thanks Simon

RE: BLE UART (NUS), altering MTU and faster interval

Simon — Thu, 10 Feb 2022 15:47:59 GMT

[quote user="TF mulder"]==> so how can i (request)/change the interval time ??[/quote]

Check out the Bluetooth throughput sample:

https://github.com/nrfconnect/sdk-nrf/tree/v1.9.0-rc1/samples/bluetooth/throughput

Follow the instructions Throughput-->Building and running (you need two boards) to run the samples and then study the code, then you will understand how to set the connection interval.

Be aware that a faster connection interval doesn't necessarily mean a higher throughput, see https://devzone.nordicsemi.com/f/nordic-q-a/69999/what-is-the-relation-between-connection-interval-and-the-throughput

[quote user="TF mulder"]

by the way.., im using an nRF5340 on the peripheral. Now i would like to use a Dongle on the PC-side, what device can you recommend?

nRF52840 Dongle ? Or is there an other dongle that matches with the nRF5340-peripheral ?

[/quote]

We don't have any nRF5340 Dongle, so I think the nRF52840 Dongle is the way to go.

If you have more questions regarding the dongle, could you open a new case, since it is not related to the initial questions (MTU and conn. interval)

Best regards,

Simon

RE: BLE UART (NUS), altering MTU and faster interval

TF mulder — Thu, 10 Feb 2022 12:31:30 GMT

Ok Simon, thanks, that worked i have an MTU=247 now.

Now the second question of my post :

2) What should i do to get a faster Interval time ?

==> so how can i (request)/change the interval time ??

--------

by the way.., im using an nRF5340 on the peripheral. Now i would like to use a Dongle on the PC-side, what device can you recommend?

nRF52840 Dongle ? Or is there an other dongle that matches with the nRF5340-peripheral ?

And is there a dongle with a housing?

Thanks,

Best Regards,

Theo

RE: BLE UART (NUS), altering MTU and faster interval

Simon — Wed, 09 Feb 2022 11:16:02 GMT

Try this sample with NCS v1.8.0:

devzone.nordicsemi.com/.../peripheral_5F00_uart_5F00_high_5F00_mtu.zip

It is the peripheral_uart sample with higher MTU support as described in https://devzone.nordicsemi.com/f/nordic-q-a/83562/file-transfer-large-data-transfer-example-nrf-connect-sdk

RE: BLE UART (NUS), altering MTU and faster interval

TF mulder — Tue, 08 Feb 2022 17:03:17 GMT

extention to the message below :-) oeff there was an extra X in CONFIG_BT_CTLR_DATXA_LENGTH_MAX

i now used CONFIG_BT_CTLR_DATA_LENGTH_MAX now it gives a remark: this could not be set: missing dependencies ...

RE: BLE UART (NUS), altering MTU and faster interval

TF mulder — Tue, 08 Feb 2022 16:54:46 GMT

Sorry, this does not help.

for example i filled in the conf you used in the, : https://devzone.nordicsemi.com/f/nordic-q-a/83562/file-transfer-large-data-transfer-example-nrf-connect-sdk, where I show how to increase the MTU for the peripheral_uart sample

CONFIG_BT_BUF_ACL_RX_SIZE=251
CONFIG_BT_ATT_PREPARE_COUNT=2
CONFIG_BT_L2CAP_TX_BUF_COUNT=10
CONFIG_BT_L2CAP_TX_MTU=247
CONFIG_BT_CTLR_RX_BUFFERS=2
CONFIG_BT_BUF_ACL_TX_COUNT=10
CONFIG_BT_BUF_ACL_TX_SIZE=251
CONFIG_BT_CTLR_DATA_LENGTH_MAX=251

i added the above CONFIG_ items in the prj.conf..

But now it does not build correctly

CONFIG_BT_CTLR_RX_BUFFERS=2 shows 'missing depependencies: BT_CTLR'

CONFIG_BT_CTLR_DATXA_LENGTH_MAX=251 this seems not to exist..?

Please have second look, thanks. You help is apriciated

Best Regards,

Theo

RE: BLE UART (NUS), altering MTU and faster interval

Simon — Tue, 08 Feb 2022 12:05:29 GMT

This ticket may help: https://devzone.nordicsemi.com/f/nordic-q-a/83562/file-transfer-large-data-transfer-example-nrf-connect-sdk, where I show how to increase the MTU for the peripheral_uart sample

Also, take a look at the Bluetooth Throughput example: https://developer.nordicsemi.com/nRF_Connect_SDK/doc/1.8.0/nrf/samples/bluetooth/throughput/README.html

Best regards,

Simon