NCS peripheral uart increase data length

RE: NCS peripheral uart increase data length

Karl Ylvisaker — Mon, 19 Jul 2021 07:48:09 GMT

[quote user="anSolo"]Thank you,
I've set
CONFIG_BT_L2CAP_TX_MTU=128
CONFIG_BT_BUF_ACL_RX_SIZE=128
for both projects and it works[/quote]

No problem at all, I am happy to hear that you got it working as intended! 🙂

[quote user="anSolo"]What is the maximum possible value for these params?[/quote]

The maximum LL PDU size is 251 bytes. However, you will have to make sure that your connection events are long enough for the device to handle your payload size.
Packets that are larger than the LL PDU size will be split over several connection events.
You could use the Online Power Profiler for BLE to visualize how the different parameters and configurations will play out.

Best regards,
Karl

RE: NCS peripheral uart increase data length

anSolo — Sat, 17 Jul 2021 12:33:01 GMT

Thank you,
I've set
CONFIG_BT_L2CAP_TX_MTU=128
CONFIG_BT_BUF_ACL_RX_SIZE=128
for both projects and it works

What is the maximum possible value for these params?

RE: NCS peripheral uart increase data length

Karl Ylvisaker — Fri, 16 Jul 2021 12:38:42 GMT

Hello,

[quote user=""]Is it possible to send more than 20 bytes from both sides?[/quote]

It is, but you will need to increase the MTU size to be able to do so in a single transfer. The UART_BUF_SIZE is the size of the UART buffer, and does not have to do with the BLE MTU size, or the NUS service configuration.
Please see this answer by my colleague Heidi for more information on how to do this in NCS v1.6.0

The summer holidays have begun here in Norway, and DevZone is therefore operating with reduced staff for the time being. Sorry for any inconvenience this might cause.

Best regards,
Karl