Hey! :blush: Has anybody ever tried bluetooth sock...

# kotlin-native

[p4czyk]

Hey! 😊 Has anybody ever tried bluetooth socket programming (RFCOMM) with Kotlin Native? 🤔 I'm trying to implement this C-example (https://people.csail.mit.edu/albert/bluez-intro/x502.html) in Kotlin Native but it doesn't work. Everything is compiling fine and executing but the socket doesn't accept any connections. 🙁

[Trevor Stone]

https://github.com/JuulLabs/kable is for ble

[p4czyk]

Do you know how it would work with C-Interoperability? Because I want to to use the native libbluetooth.so. 😅

[napperley]

Are you trying to do Bluetooth stuff with the Linux targets?

[p4czyk]

Yes, I do. The compiler runs on x64 but the target is aarch64 (Raspberry Pi 4 Model B).

[napperley]

The aarch64 CPU architecture corresponds to the linuxArm64 Kotlin Native target. Kable isn't usable since it is missing support for the Linux targets.

[napperley]

Looks like there is a security issue with opening the socket. Is some other process using the socket?

[napperley]

Silly question here. Is the program running on the Rpi or on a Linux PC (desktop using a BT dongle or laptop)?

[napperley]

Have you considered compiling the program for the linuxX64 target, and running it on a Linux laptop?

[napperley]

Do you realise that accessing any port below 1024 requires superuser privileges ( https://unix.stackexchange.com/questions/16564/why-are-the-first-1024-ports-restricted-to-the-root-user-only )?

[p4czyk]

I don't think that another process is using the socket because when I run the C equivalent everything works fine on the Raspberry Pi.

[napperley]

Below are some questions to get a better picture on what is occurring:
1. What is being outputted to the console?
2. Are there any errors showing up?
3. What happens when you run the program as root?
4. Have you tried implementing a different BT server example?
5. Does the program work with the linuxX64 target?