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/*
 *  $status = {
 *      "status": "online" | "offline",
 *      "cover": "open" | "closed", (opt)
 *      "feeding": "feeding" | "not", (opt)
 *      "autocutterError": "error" | "not", (opt)
 *      "unrecoverableError": "error" | "not", (opt)
 *      "recoverableError": "error" | "not", (opt)
 *      "paper": "paperEnd" | "paperPresent" (opt)
 *      }
 *  See https://www.epson-biz.com/modules/pos/index.php?page=single_doc&cid=1600
 */
function getStatus($printerIp, $debug = false) {
    $status = array();
    $printerPort = 3289;
    $socket = socket_create(AF_INET, SOCK_DGRAM, SOL_UDP);

    if ($socket === false) {
        //echo "socket_create() failed: reason: " . socket_strerror(socket_last_error()) . "\n";
        $status["status"] = "offline";
        return $status;
    } else {
        $timeout = array('sec' => 10, 'usec' => 0);
        socket_set_option($socket, SOL_SOCKET, SO_RCVTIMEO, $timeout);

        $outputString = "EPSON";
        $outputString .= "Q"; // PacketType (Q)
        $outputString .= "\x03"; // DeviceType(3)
        $outputString .= "\x00"; // DeviceNumber(0)
        $outputString .= "\x00"; // Function(0010h)
        $outputString .= "\x10"; // Function(0010h)
        $outputString .= "\x00"; // Result
        $outputString .= "\x00";
        $outputString .= "\x00"; // parameter length Length
        $outputString .= "\x00";
        $len = strlen($outputString);

        if (false !== socket_sendto($socket, $outputString, $len, 0, $printerIp, $printerPort)) {
            if (false !== ($bytes = socket_recv($socket, $buf, 2048, MSG_WAITALL))) {
                //echo "Read $bytes bytes from socket_recv(). Closing socket...";
                //if (($buf[10] == "\x00") && ($buf[11] == "\x00")) {
                    if ($debug) {
                        for ($i = 0; $i < 27; $i++) {
                            echo $i . ": " . bin2hex($buf[$i]) . "<br>";
                            echo $i . ": " . str_pad(decbin(ord($buf[$i])), 8, '0', STR_PAD_LEFT) . "<br>";
                        }
                        echo "<br>";
                    }

                    if (ord($buf[15]) & pow(2, 3)) {
                        $statusValue = "offline";
                    } else {
                        $statusValue = "online";
                    }
                    $status["status"] = $statusValue;

                    if (ord($buf[15]) & pow(2, 5)) {
                        $cover = "open";
                    } else {
                        $cover = "closed";
                    }
                    $status["cover"] = $cover;

                    if (ord($buf[15]) & pow(2, 6)) {
                        $feeding = "feeding";
                    } else {
                        $feeding = "not";
                    }
                    $status["feeding"] = $feeding;

                    if (ord($buf[16]) & pow(2, 3)) {
                        $autocutter = "error";
                    } else {
                        $autocutter = "not";
                    }
                    $status["autocutterError"] = $autocutter;

                    if (ord($buf[16]) & pow(2, 5)) {
                        $unrecoverableError = "error";
                    } else {
                        $unrecoverableError = "not";
                    }
                    $status["unrecoverableError"] = $unrecoverableError;

                    if (ord($buf[16]) & pow(2, 6)) {
                        $recoverableError = "error";
                    } else {
                        $recoverableError = "not";
                    }
                    $status["recoverableError"] = $recoverableError;

                    if ((ord($buf[17]) & pow(2, 2)) &&
                        (ord($buf[17]) & pow(2, 3))) {
                        $paperStatus = "paperEnd";
                    } else {
                        $paperStatus = "paperPresent";
                    }
                    $status["paper"] = $paperStatus;
                //}
            } else {
                //echo "socket_recv() failed; reason: " . socket_strerror(socket_last_error($socket)) . "\n";
                $status["status"] = "offline";
            }
        } else {
            //echo "socket_sendto() failed";
            $status["status"] = "offline";
        }

        socket_close($socket);
        return $status;
    }