CURL SSL

    #define APPLE_CERT_NAME "certs/apple.cer"
    #define APPLE_CERT_TYPE "PK12"
    #define APPLE_PUSH_SERVICE_URL "gateway.sandbox.push.apple.com:2195"

    CURLcode c;
    c = curl_easy_setopt(curl, CURLOPT_USE_SSL, CURLUSESSL_ALL);
    if (c != CURLE_OK)
        WARNX("curl_easy_setopt error CURLOPT_USE_SLL %s", curl_easy_strerror(c));

    c = curl_easy_setopt(curl, CURLOPT_SSLCERT, APPLE_CERT_NAME);
    if (c != CURLE_OK)
        WARNX("curl_easy_setopt error CURLOPT_SSLCERT: %s", curl_easy_strerror(c));
    c = curl_easy_setopt(curl, CURLOPT_SSLCERTTYPE, APPLE_CERT_TYPE);
    if (c != CURLE_OK)
        WARNX("curl_easy_setopt error CURLOPT_SSL_CERTTYPE: %s", curl_easy_strerror(c));

    curl_easy_setopt(curl, CURLOPT_CONNECT_ONLY, 1L);
    curl_easy_setopt(curl, CURLOPT_URL, APPLE_PUSH_SERVICE_URL);

    // curl_easy_perform

    size_t sent, rec = 0;
    ccode = curl_easy_send(curl, ((struct ios_push_request *)buffer->aux_data)->sbuffer, ((struct ios_push_request *)buffer->aux_data)->request_size, &sent);
    if (ccode != CURLE_OK)
        WARNX("curl_easy_send %s", curl_easy_strerror(ccode));

    LOG("----- Sent %lu bytes from %lu", sent, ((struct ios_push_request *)buffer->aux_data)->request_size); // it always sends all the data

    sleep(3);
    ccode = curl_easy_recv(curl, buf, 1024, &rec);
    if (ccode != CURLE_OK)
        WARNX("curl_easy_recv %s", curl_easy_strerror(ccode)); // unsupported protocol