static function fromBinString($binString)
{
$pdu = new self();
$buf = unpack('C*', $binString);
$i = 1;
$pdu->version = $buf[$i] >> 6;
$pdu->type = $buf[$i] >> 4 & 0x3;
$tkl = $buf[$i] & 15;
$i++;
$pdu->code = sprintf('%01d', $buf[$i] >> 5);
$pdu->code .= '.' . sprintf('%02d', $buf[$i] & 0x7);
$i += 2;
$pdu->messageId = $buf[$i - 1] << 8 | $buf[$i];
if ($tkl > 0) {
for ($i = $i; $i <= $tkl; $i++) {
$pdu->token .= unpack('C', $buf[$i]);
}
}
$i += $tkl + 1;
if (isset($buf[$i])) {
$prev = 0;
while ($i <= count($buf) && $buf[$i] != 0xff) {
$prev = $pdu->parseOption($buf, $i, $prev);
}
if ($i <= count($buf) && $buf[$i] == 0xff) {
$pdu->readPayload($buf, $i + 1);
}
} else {
// empty
}
return $pdu;
}
