Multilink central with UART

[IamSubbu]

Hello,

I am trying to develop a sensor which can connect to multiple sensors and send the data which is received by its UART through bluetooth, at the peripheral. Central device reveives the data through the bluetooth and then sends it out through UART. I have tried the example given in the SDK and it is working fine. Now i want to add multilink features to the central device. I tried adding, but it did not work out. Can someone please help me out with the same? Is there any example program available for this?

SDK Used: NRF52 SDK 16.0

Chipset : NRF52832

IDE : Segger Embedded Studio

Regards,

Subbu

[ovrebekk]

Hi Subbu

If I understand you correctly you want a multilink version of the ble_app_uart_c example?

I have thought about making such an example for a while, and can try to provide something by the end of the week if this is what you need. 

Best regards
Torbjørn

[IamSubbu]

Yes. Exactly. I need the multilink version of ble_app_uart_c. Please let me know once you have it.

Thanks,

Subbu

[ovrebekk]

Hi Subbu

I modified the ble_app_uart_c example with multilink support and put it on our Github playground account:
https://github.com/NordicPlayground/nrf52-ble-app-uart-c-multilink

Please give it a try and let me know if you have any issues with it. 

Best regards
Torbjørn

[IamSubbu]

Hi Torbjørn,

Thanks for this. I just downloaded. Will test it and let you know shortly. But a small doubt before that. I was looking into the code. But it did not have any target device name. How will the central know that to which peripheral it has to connect?

Regards,

Subbu

[IamSubbu]

Also i tested this example with two peripherals along with a central. Below are my observations.

1. Sending the data from the central is received at both the peripherals.

2. Sending the data from peripheral 1 is received at the central and peripheral 2.

3. Sending the data from peripheral 2 is received at the central and peripheral 1.

Can we modify a little bit? So peripheral sends the data only to the central, and the other peripheral should not get the information.

Also, the message sent from the central, should not come back to the central. I guess this can be done by modifying echoback.

Regards,

Subbu

[ovrebekk]

Hi Subbu

I tried to keep the example as similar as possible to the original example, and modified it to send the data to all links rather than just a single one. 

You can obviously change this as you see fit depending on your application requirements. 

To find the points in the code where I send data to all the links just look for a loop similar to this:

for(int c = 0; c < NRF_SDH_BLE_CENTRAL_LINK_COUNT; c++)
...

And yes, to disable the echo just set the ECHOBACK_BLE_UART_DATA define on line 75 of main.c to 0.

Best regards
Torbjørn