main.c

// Include the most common headers from the C standard library
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

// Include the main libnx system header, for Switch development
#include <switch.h>

#define MAX_DEVICES 20

// See also libnx pad.h / hid.h.
void print_hex(char* data[], int length) {
    for (int i = 0; i < length; i++) {
        printf("%02x ", data[i]);
    }
}

// Main program entrypoint
int main(int argc, char* argv[])
{
    // This example uses a text console, as a simple way to output text to the screen.
    // If you want to write a software-rendered graphics application,
    //   take a look at the graphics/simplegfx example, which uses the libnx Framebuffer API instead.
    // If on the other hand you want to write an OpenGL based application,
    //   take a look at the graphics/opengl set of examples, which uses EGL instead.
    consoleInit(NULL);
    setInitialize();
    setsysInitialize();

    // Configure our supported input layout: a single player with standard controller styles
    padConfigureInput(1, HidNpadStyleSet_NpadStandard);

    PadState pad;
    padInitializeDefault(&pad);
    SetSysBluetoothDevicesSettings settings[MAX_DEVICES];
    s32 total_out;


    printf("\x1b[1;1HPress PLUS to exit.");
    printf("\x1b[2;1H");

    int line = 4;
    Result rc = setsysGetBluetoothDevicesSettings(&total_out, &settings, MAX_DEVICES);
    if (R_SUCCEEDED(rc)) {
        for (int i = 0; i < total_out; i++)
        {
            SetSysBluetoothDevicesSettings *device = &settings[i];
            if (device->addr.address) {
                printf("\x1b[%d;1HName: %s %d:%d %x btAddr: ", line, device->name2, device->vid, device->pid, device->sub_class);
                for (int i = 0; i < 6; i++) {
                    printf("%02x ", device->addr.address[i]);
                }
                line++;
                printf("\x1b[%d;1H Type: %d  Key: ", line, device->key_type);
                for (int i = 0; i < 16; i++) {
                    printf("%02x ", device->link_key[i]);
                }
                line++;
            }
        }
            
            // Print link key etc
    }
    // Main loop
    while(appletMainLoop())
    {
        // Scan the gamepad. This should be done once for each frame
        padUpdate(&pad);
        // padGetButtonsDown returns the set of buttons that have been
        // newly pressed in this frame compared to the previous one
        u64 kDown = padGetButtonsDown(&pad);
        // padGetButtons returns the set of buttons that are currently pressed
        if (kDown & HidNpadButton_Plus)
            break; // break in order to return to hbmenu
        // Update the console, sending a new frame to the display
        consoleUpdate(NULL);
    }

    // Deinitialize and clean up resources used by the console (important!)
    consoleExit(NULL);
    return 0;
}

thanks for the comments, it wasnt really clear from the defenition to me and I'm not really a c guy :)