Ble central- BLE app multilink using UART for other MCU connections

[PeteKcSum]

Hi NordicS,

We have a project that uses multiple BT peripheral devices connected to various sensors, and 3 BT centrals that are connected to a MCU that acts as the "mainframe" for collecting the data that is retrieved from the peripherals via the BT centrals. As such, we need to modify the BT centrals to be able to use UART for communicating with the external mainframe MCU. The reason for using UART is so that we could use terminals and send AT like commands to control the BT centrals.

I have tested the BLE app multilink example and made sure it is able to connect to peripheral device. works fine. Specified the slave device name and upon reboot it searches for the slave and conects automatically.

After that I tried to integrate the "peripheral\UART -  example" to the central app, which failed. Next i disabled the nRF log feature, which also does not help. The BT central cannot automatically connect to the slave device anymore. Any clue would be appreciated. thx

[bbslhb]

Hi, Simon, can you tell which version of SDK are you  using?

I am using "nRF5_SDK_15.2.0_9412b96" and failed to build your project in the zip file.

[Simon]

I used nRF5_SDK_15.3.0_59ac345 and the nRF52832 DK (I didn't have the nRF52840 at hand when creating the example).

I will test it tomorrow with the nRF52840 DK and SDK 15.2, and see if I am able to make it work.

Best regards,

Simon

[bbslhb]

Hi, Simon.Thanks for your reply.

I can build it on SDK_15.3.0 now.

But I still can't use printf.

I think the purpose for this question is to use UART of the BLE central to communicate with PC.

For example: I flash your sample code into nRF52xxx and nRF52xxx became a BLE central.

After power on, it begin to scan all BLE peripherals and printf all the BLE names through the uart.

[Simon]

Test out this example:

 ble_app_multilink_central_uart.zip

Best regards,

Simon