#include <assert.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

/**
 * \brief Default unix socket path (the leading \0 means using the abstract
 * namespace instead of the filesystem).
 */
#define UNIX_PATH "\0updownsrv"

int main() {
    struct sockaddr_un addr;
    char buf[100];
    int fd,rc;

    char * socket_path = UNIX_PATH;

    if ( (fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
        perror("socket error");
        exit(-1);
    }

    memset(&addr, 0, sizeof(addr));
    addr.sun_family = AF_UNIX;
    if (*socket_path == '\0') {
        *addr.sun_path = '\0';
        strncpy(addr.sun_path+1, socket_path+1, sizeof(addr.sun_path)-2);
    } else {
        strncpy(addr.sun_path, socket_path, sizeof(addr.sun_path)-1);
    }

    if (connect(fd, (struct sockaddr*)&addr, sizeof(addr)) == -1) {
        perror("connect error");
        exit(-1);
    }

    printf("Waiting for server data...\n");
    while( (rc=read(fd, buf, sizeof(buf))) > 0) {
        assert(rc == 1);
        switch(buf[0]) {
            case '\0':
                printf("WiFi\n");
                break;
            case '\1':
                printf("LTE\n");
                break;
            default:
                printf("Unknown\n");
                break;
        }
    }

    return 0;
}