Best method for send raw frames

[Artur]

Hi,

My goal is to send raw frames to some external device which is not nRF BLE example but commercial used device.

It is using some fixed service with fixed UUID and I need to send predetermined data to get answer.

Could You help me with choosing proper sd_ functions for sending and receiving data?

Regards,

Artur

[awneil]

Artur said:

commercial used device

So what device, exactly, is that?

Have you contacted the manufacturer for supported, and/or looked for documentation?

Is it a BLE device?

Can you program it, or do you just have to work with it "as-is" ?

Artur said:

It is using some fixed service with fixed UUID and I need to send predetermined data to get answer

So you'll need to know the UUID, and full details of the Service(s) and Characteristic(s) and how it uses them to transfer this "predetermined data"

Nordic's tutorials on how to implement custom Services and Characteristics:

https://devzone.nordicsemi.com/nordic/short-range-guides/b/bluetooth-low-energy/posts/ble-services-a-beginners-tutorial

https://devzone.nordicsemi.com/nordic/short-range-guides/b/bluetooth-low-energy/posts/ble-characteristics-a-beginners-tutorial

You will also have to make sure that your Advertising is acceptable to this "commercial used device"

[Artur]

It is some door lock but I do not know if I can specify which one.

It uses BLE and I have got documentation.

I am making central device and lock will be used as peripheral device.

I cannot load in lock my own firmware, I need to work with it as is. 

I was able to find proper UUID after scan_request and connect with it, now my goal is to send some data.

I just need to send some data after connection, is there any API function for sending any frame?

[awneil]

The whole point of a standard like BLE is that the comms is standardised - using the standard mechanisms of Services, Characteristics, etc.

So you need to discover what are the Services, Characteristics, etc on this lock, and how are they used.

Then it just becomes a standard task of using those Services, Characteristics, etc