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DESCRIPTION
    Porttracker (<http://www.porttracker.com/>) is a product that (among
    other things) scans switches and routers in a network and gives a
    coherent view of which end devices are connected to which switch ports
    on which switches and routers. It also offers a JSON-based client API,
    for which this module is an implementation.

    In addition to Porttracker, the PortIQ product is also supported, as it
    uses the same protocol.

    If you do not have access to either a Porttracker or PortIQ box then
    this module will be of little value to you.

    This module is an AnyEvent user, you need to make sure that you use and
    run a supported event loop.

    To quickly understand how this module works you should read how to
    construct a new connection object and then read about the event/callback
    system.

    The actual low-level protocol and, more importantly, the existing
    requests and responses, are documented in the official Porttracker API
    documentation (a copy of which is included in this module as
    AnyEvent::Porttracker::protocol.

THE AnyEvent::Porttracker CLASS
    The AnyEvent::Porttracker class represents a single connection.

    $api = new AnyEvent::Porttracker [key => value...]
        Creates a new porttracker API connection object and tries to connect
        to the specified host (see below). After the connection has been
        established, the TLS handshake (if requested) will take place,
        followed by a login attempt using either the "none",
        "login_cram_md6" or "login" methods, in this order of preference
        (typically, "login_cram_md6" is used, which shields against some
        man-in-the-middle attacks and avoids transferring the password).

        It is permissible to send requests immediately after creating the
        object - they will be queued until after successful login.

        Possible key-value pairs are:

        host => $hostname [MANDATORY]
            The hostname or IP address of the Porttracker box.

        port => $service
            The service (port) to use (default: "porttracker=55").

        user => $string, pass => $string
            These are the username and password to use when authentication
            is required (which it is in almost all cases, so these keys are
            normally mandatory).

        tls => $bool
            Enables or disables TLS (default: disables). When enabled, then
            the connection will try to handshake a TLS connection before
            logging in. If unsuccessful a fatal error will be raised.

            Since most Porttracker/PortIQ boxes will not have a
            sensible/verifiable certificate, no attempt at verifying it will
            be done (which means man-in-the-middle-attacks will be trivial).
            If you want some form of verification you need to provide your
            own "tls_ctx" object with "verify => 1, verify_peername => [1,
            1, 1]" or whatever verification mode you wish to use.

        tls_ctx => $tls_ctx
            The AnyEvent::TLS object to use. See "tls", above.

        on_XYZ => $coderef
            You can specify event callbacks either by sub-classing and
            overriding the respective methods or by specifying code-refs as
            key-value pairs when constructing the object. You add or remove
            event handlers at any time with the "event" method.

    $api->req ($type => @args, $callback->($api, @reply))
        Sends a generic request of type $type to the server. When the server
        responds, the API object and the response arguments (without the
        success status) are passed to the callback, which is the last
        argument to this method.

        If the request fails, then a fatal error will be raised. If you want
        to handle failures gracefully, you need to use "->req_failok"
        instead.

        The available requests are documented in the Porttracker API
        documentation (a copy of which is included in this module as
        AnyEvent::Porttracker::protocol.

        It is permissible to call this (or any other request function) at
        any time, even before the connection has been established - the API
        object always waits until after login before it actually sends the
        requests, and queues them until then.

        Example: ping the porttracker server.

           $api->req ("ping", sub {
              my ($api, $ok, $timestamp, $pid) = @_;
              ...
           });

        Example: determine the product ID.

           $api->req (product_id => sub {
              my ($api, $ok, $branding, $product_id) = @_;
              ...
           });

        Example: set a new license.

           $api->req (set_license => $LICENSE_STRING, sub {
              my ($api, $ok) = @_;

              $ok or die "failed to set license";
           });

    @res = $api->req_sync ($type => @args)
        Similar to "->req", but waits for the results of the request and on
        success, returns the values instead (without the success flag, and
        only the first value in scalar context). On failure, the method will
        "croak" with the error message.

    $api->req_failok ($type => @args, $callback->($api, $success, @reply))
        Just like "->req", with two differences: first, a failure will not