Communication between BlueZ Linux machine and a BT832X (nRF52832 based) module

[Neacsu Cristian]

Hello,

I am trying to develop a communication between a Linux machine that had a ASUS USB-BT500 (an universal bluetooth connector that is supporting Bluetooth 5 as well), using BlueZ library. What I am trying to achieve is a very simple scenario. I need to open a socket, send a package to BT832X ("hello from linux"), and then receive another package ("hello from nordic").

I succeeded to scan the BLE devices using a custom agent of bluetoothctl in order to obtain the MAC of the device. Then I'm trying to open a socket RF_COMM type, L2CAP type and so on. Nothing works. It hangs at connect. Therefore do you have a tiny piece of code in order to just open a proper socket and send a byte of data?

This is my last attempt of many:

Thank you and looking forward for you reply.

[Håkon Alseth]

Hi,

 

RFCOMM is the serial port profile, which is only available for legacy bluetooth (ie. not Low energy).

For Bluez examples, I would recommend that you contact the bluez community. A good place to start is by looking at their test code, which has some basic examples: https://github.com/bluez/bluez/tree/master/test

 

Kind regards,

Håkon

[Neacsu Cristian]

Hello Hakon,

Thank you so much for your answer. Yes I will looking forward for examples, but trust me I looked all around, on their sources and so on, but so far I failed on all the attempts. I will have a look on the link that you gave me.

But at least to have some trust in this project, is it possible? I mean it is doable what I'm trying to achieve?

Thank you and looking forward for your reply.

[Håkon Alseth]

Hi,

 

Bluez is used in most linux based distros and systems, and it has LE capabilities.

However; it might not have the exact samples that you're after, ie. written in pure C.

 

Writing a sample directly in C, with posix sockets, is not likely to work with LE based links, but I'm not a bluez expert. I would recommend that you contact the community there to ask if there's any C-based samples available if that is what you're after.

 

Kind regards,

Håkon

[mtsunstrum]

Yes, definitely possible.

You can first verify via various command line tools:

https://www.digi.com/resources/documentation/digidocs/90001547/reference/bsp/r_bluetooth_ble.htm

Under our Linux system, we develop using the Dart programming library, and use the `BlueZ` package to communicate to our LE devices.