Teltonika FMB965 continues sending same records – Ack Problem?

Question

Im trying to build a small GPS-tracking software.

To parse the data sent through TCP/IP from the device to my server I am using this package: https://github.com/uro/teltonika-fm-parser

I already receive all necessary information and store it to the database successfully.

But unfortunately, the FMB965 sends the same records again and again. So, after I've formatted the tracker, it start's with one record. Next connection two records, etc. etc. Seems like the ACK doesn't get back to the tracker?

    $ip = env('SOCKET_SERVER_IP');
    $port = env('SOCKET_SERVER_PORT');

    $parser = new FmParser('tcp');
    $socket = stream_socket_server("tcp://$ip:$port", $errno, $errstr);
    $this->info("Listening to tcp://{$ip}:{$port}...");
    if (!$socket) {
        throw new \Exception("$errstr ($errno)");
    } else {
        while ($conn = stream_socket_accept($socket)) {

            // Read IMEI
            $payload = fread($conn, 1024);
            $imei = $parser->decodeImei($payload);

            // Accept packet
            fwrite($conn, Reply::accept());

            // Read Data
            $payload="";
            while( !feof( $conn ) ) {
                $payload .= fread( $conn, 1024 ) ;
            }

            $packet = $parser->decodeData($payload);

            fwrite($conn, $parser->encodeAcknowledge($packet));

            foreach ($packet->getAvlDataCollection()->getAvlData() as $avlData) {
                $gps = $avlData->getGpsElement();
                // Create it in DB
                $this->info('Record created');
            }
            fclose($conn);
        }

        fclose($socket);
    }