BLE project with 1 central and 2 peripherals

[eleven-x_devteam]

Hi,

I am looking for a proper solution for BLE data communication among 3 devices like 1 central and 2 peripherals.

2 peripherals could send around 300 bytes to the central with 100m~1s time gap and central sends around 30 bytes to the 2 peripherals hourly.

For this project, I am looking at the multi-link central example but also nus service.

Is the nus proper for this project like sending 300 bytes data from multiple peripherals to the central very short time and central sends data to both peripherals?

I mean multi-link central and nus could be used at the same time? or anyone can recommend any other solution or example for multi-link data communication?

Thanks in advance.

[Vidar Berg]

Hello,

Yes, I think the NUS service and client implementation should be a good starting point. I don't foresee any problems with supporting multiple connections with this service. It also supports sending and receiving of arbitrary data. 

I would recommend making a copy of the NUS service and placing it in your project's source directory if you plan on making changes to it, such as modifying the service UUID. 

Please note that the NUS client uses the GATT Discovery Manager for service discovery, unlike the multilink sample, which uses the host APIs directly.

NUS source files:

- https://github.com/nrfconnect/sdk-nrf/blob/main/subsys/bluetooth/services/nus.c 

- https://github.com/nrfconnect/sdk-nrf/blob/main/subsys/bluetooth/services/nus_client.c 

- https://github.com/nrfconnect/sdk-nrf/blob/main/include/bluetooth/services/nus.h

- https://github.com/nrfconnect/sdk-nrf/blob/main/include/bluetooth/services/nus_client.h 

Best regards,

Vidar

[eleven-x_devteam]

Thanks for the answer.

I verified that NUS worked with multiple connections.