NUS Service RX maximum size

[embeddedER]

Hello Team,

We are developing an application with nRF52832 and ncsv1.8.0.

We are using NUS service to share data between Mobile and Nordic Chip. With the help of nRF Connect Mobile application, we are able to send the data to Nordic chip. However, the maximum length of data that van be shared is 20. If we go beyond that, application hangs and we don't receive anything on the nRF52832.

Tried printing the MCU size using bt_nus_get_mtu() and it returns 20. We couldn't find an API to set the size of the MTU. Is there any way to set this to 255?

Thanks!

[Simonr]

Hi

Please check out the Bluetooth: Throughput sample in the nRF Connect SDK. It explains how you can set the ATT_MTU size higher than 23 bytes (20 + overhead) by configuring it in menuconfig, and enable data length extensions. If you're still having issues, what phone model exactly are you using with the nRF Connect for Mobile application, and do you see any error messages in the nRF Connect app's log info (if you open the log window on the left side in nRF Connect).

Best regards,

Simon