nRF UART central example

[Kasper Leonhardt]

Hi NordicS

Do you have a code example for a central UART application?

I am looking for a example that acts just like the nRF Uart App, but running on e.g. a PCA10031 dongle.

I have tried a look lot of different examples using the S120 softdevice, but I cannot find one example that actually communicates with the client device in connected state.

BR Kasper TekPartner

[Vidar Berg]

There is a uart central example based on SDK 9.0.0. available on our github page: https://github.com/NordicSemiconductor/ble_app_uart_c_S120

EDIT 23.2 - Added code example:

nRF51_SDK_9.0.0_uart_central_peripheral_230216.zip

[Kasper Leonhardt]

Works fine. However it does not work if client device requires encryption. :-( Shouldn't the softdevice handle the encryption requirement automatically, just like the OS on the smartphone?

[Vidar Berg]

Security requirements has to be set in the application and is typically handled by the device manager module /peer manager.

However, the UART example is one of the few examples that doesn't support bonding by default. You may find this tutorial helpful if you want to add the device manager to your project.

[Kasper Leonhardt]

Are you refeering to the central or client device regarding the Sequrity requirements.

The client device works fine in bonded/encrypted together (with device manager) with a custom app. However when I use the client device with the central example above, the transmission from central to client works fine, but reception from client is ignored. I have enabled ENABLE_DEBUG_LOG_SUPPORT on both, and on the central I only see the "[uart_C]:" events when sending data, but no indication of received data. I do not know if data is actually sent from the client, but I gets not errors from the ble_nus_string_send function.

It works fine with bonding/encryption disabled from the client device. (But when client disconnects the client crashes, but that is a compleate different issue)

[Vidar Berg]

Modified the uart peripheral and central example to support bonding and attached it to my answer above. Please check if it gives you the same result.

[Marco Russi]

Hi, I just let you know that I released a modified version of the UART central example that can connect to many peripherals at the same time. You find it here: github.com/.../nrf51_multi_nus_central