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<?php |
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declare(strict_types=1); |
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namespace unreal4u\MQTT\Protocol; |
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use unreal4u\MQTT\Exceptions\Connect\NoConnectionParametersDefined; |
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use unreal4u\MQTT\Exceptions\MustProvideUsername; |
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use unreal4u\MQTT\Internals\ProtocolBase; |
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use unreal4u\MQTT\Internals\WritableContent; |
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use unreal4u\MQTT\Internals\WritableContentInterface; |
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use unreal4u\MQTT\Protocol\Connect\Parameters; |
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use unreal4u\MQTT\Utilities; |
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/** |
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* After a Network Connection is established by a Client to a Server, the first Packet sent from the Client to the |
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* Server MUST be a CONNECT Packet |
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*/ |
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final class Connect extends ProtocolBase implements WritableContentInterface |
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{ |
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use WritableContent; |
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const CONTROL_PACKET_VALUE = 1; |
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/** |
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* @var Parameters |
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*/ |
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private $connectionParameters; |
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/** |
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* Saves the mandatory connection parameters onto this object |
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* @param Parameters $connectionParameters |
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* |
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* @return Connect |
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*/ |
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public function setConnectionParameters(Parameters $connectionParameters): Connect |
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{ |
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$this->connectionParameters = $connectionParameters; |
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return $this; |
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} |
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/** |
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* Get the connection parameters from the private object |
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* |
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* @return Parameters |
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* @throws \unreal4u\MQTT\Exceptions\Connect\NoConnectionParametersDefined |
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*/ |
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public function getConnectionParameters(): Parameters |
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{ |
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if ($this->connectionParameters === null) { |
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throw new NoConnectionParametersDefined('You must pass on the connection parameters before connecting'); |
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} |
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return $this->connectionParameters; |
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} |
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1 |
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public function createVariableHeader(): string |
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{ |
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$bitString = $this->createUTF8String('MQTT'); // Connect MUST begin with MQTT |
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1 |
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$bitString .= $this->getProtocolLevel(); // Protocol level |
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1 |
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$bitString .= \chr($this->connectionParameters->getFlags()); |
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1 |
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$bitString .= Utilities::convertNumberToBinaryString($this->connectionParameters->keepAlivePeriod); |
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return $bitString; |
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} |
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public function createPayload(): string |
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{ |
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3 |
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$output = ''; |
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// The order in a connect string is clientId first |
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3 |
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if ($this->connectionParameters->getClientId() !== '') { |
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3 |
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$output .= $this->createUTF8String($this->connectionParameters->getClientId()); |
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} |
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// Then the willTopic if it is set |
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3 |
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if ($this->connectionParameters->getWillTopic() !== '') { |
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1 |
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$output .= $this->createUTF8String($this->connectionParameters->getWillTopic()); |
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} |
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// The willMessage will come next |
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3 |
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if ($this->connectionParameters->getWillMessage() !== '') { |
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1 |
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$output .= $this->createUTF8String($this->connectionParameters->getWillMessage()); |
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} |
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// If the username is set, it will come next |
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3 |
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if ($this->connectionParameters->getUsername() !== '') { |
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1 |
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$output .= $this->createUTF8String($this->connectionParameters->getUsername()); |
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} |
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// And finally the password as last parameter |
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if ($this->connectionParameters->getPassword() !== '') { |
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if ($this->connectionParameters->getUsername() === '') { |
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throw new MustProvideUsername('A password can not be set without a username! Please set username'); |
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} |
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$output .= $this->createUTF8String($this->connectionParameters->getPassword()); |
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} |
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return $output; |
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} |
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public function shouldExpectAnswer(): bool |
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{ |
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return true; |
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} |
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} |
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unreal4u /
mqtt
