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<?php
declare(strict_types=1);
namespace unreal4u\MQTT\DataTypes;
/**
* This Value Object will always contain a valid Packet Identifier
*/
final class ClientId
{
* This field indicates the name of the clientId that we'll pass on to the broker.
*
* @var string
private $clientId;
* QoSLevel constructor.
* @param int $packetIdentifier
* @throws \OutOfRangeException
public function __construct(string $clientId)
$this->clientId = $clientId;
}
* Gets the current clientId
* @return string
public function getClientId(): string
return $this->clientId;
public function __toString(): string
return $this->getClientId();
public function isEmptyClientId(): bool
return $this->clientId === '';
public function performStrictValidationCheck(): string
$possibleProblem = '';
$utf8ClientIdSize = \mb_strlen($this->clientId);
if ($this->isEmptyClientId()) {
/*
* If you ever wind up in this situation, search for MQTT-3.1.3-7 on the following document for more
* information: http://docs.oasis-open.org/mqtt/mqtt/v3.1.1/os/mqtt-v3.1.1-os.html#_Toc398718067
$possibleProblem = 'ClientId size is 0 bytes. This has several implications, check comments';
} elseif ($utf8ClientIdSize > 23) {
$possibleProblem = 'The broker MAY reject the connection because the ClientId is too long';
} elseif (\strlen($this->clientId) !== $utf8ClientIdSize) {
$possibleProblem = 'The broker MAY reject the connection because of invalid characters';
return $possibleProblem;
unreal4u /
mqtt
