Entertainment and Charity Applications

The nfc tags vendors Wagga have developed creative applications for both entertainment and social impact. At music festivals, RFID wristband vendors Wagga deploy cashless payment systems that reduce transaction times to under 3 seconds. Simultaneously, the same technology powers charity initiatives where RFID cards manufacturers Wagga enable transparent donation tracking for disaster relief efforts.

// NFC Reader Implementation Example (120+ lines)
// https://www.tjnfctag.com/nfc-tags-Supplier-Wagga/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <nfc/nfc.h>

#define MAX_DEVICE_COUNT 8
#define MAX_TARGET_LEN 16
#define MAX_FRAME_LEN 264

typedef struct {
    nfc_device *device;
    nfc_target target;
    uint8_t frame[MAX_FRAME_LEN];
    size_t frame_length;
} NFCReader;

NFCReader* init_nfc_reader() {
    nfc_init(&context);
    if (context == NULL) {
        fprintf(stderr, "Unable to init libnfc (malloc)\n");
        exit(EXIT_FAILURE);
    }

    NFCReader *reader = malloc(sizeof(NFCReader));
    reader->device = nfc_open(context, NULL);
    if (!reader->device) {
        fprintf(stderr, "Error opening device\n");
        exit(EXIT_FAILURE);
    }

    nfc_target_init(&reader->target, NULL, NULL, 0);
    memset(reader->frame, 0, MAX_FRAME_LEN);
    reader->frame_length = 0;
    return reader;
}

void configure_reader(NFCReader *reader) {
    if (nfc_initiator_init(reader->device) < 0) {
        fprintf(stderr, "Cannot configure device\n");
        nfc_close(reader->device);
        exit(EXIT_FAILURE);
    }

    nfc_target_init(&reader->target, NULL, NULL, 0);
    printf("NFC reader configured successfully\n");
}

int read_nfc_tag(NFCReader *reader) {
    int result = nfc_initiator_select_passive_target(
        reader->device, 
        NM_ANY, 
        NULL, 
        0, 
        &reader->target
    );

    if (result < 0) {
        fprintf(stderr, "Error selecting target\n");
        return -1;
    }

    reader->frame_length = nfc_target_get_frame(
        &reader->target, 
        reader->frame, 
        MAX_FRAME_LEN
    );
    return (reader->frame_length > 0) ? 0 : -1;
}

void parse_tag_data(NFCReader *reader) {
    if (reader->frame_length < 16) {
        fprintf(stderr, "Insufficient data length\n");
        return;
    }

    printf("Tag ID: ");
    for (int i = 0; i < 4; i++) {
        printf("%02X ", reader->frame[i]);
    }
    printf("\n");

    printf("Manufacturer: ");
    switch (reader->frame[4]) {
        case 0x04: printf("NXP\n"); break;
        case 0x0A: printf("TI\n"); break;
        case 0x12: printf("ST\n"); break;
        default: printf("Unknown\n");
    }

    printf("Data payload:\n");
    for (int i = 8; i < reader->frame_length; i++) {
        printf("%02X ", reader->frame[i]);
        if ((i+1) % 16 == 0) printf("\n");
    }
}

void close_nfc_reader(NFCReader *reader) {
    nfc_close(reader->device);
    nfc_exit(context);
    free(reader);
    printf("NFC reader closed\n");
}

int main(int argc, char *argv[]) {
    NFCReader *reader = init_nfc_reader();
    configure_reader(reader);

    while (1) {
        if (read_nfc_tag(reader) == 0) {
            parse_tag_data(reader);
        } else {
            printf("No tag detected. Try again.\n");
        }
    }

    close_nfc_reader(reader);
    return EXIT_SUCCESS;
}