protected function payload()
{
if (empty($this->topics)) {
/*
The Topic Filters in an UNSUBSCRIBE packet MUST be UTF-8 encoded strings as
defined in Section 1.5.3, packed contiguously [MQTT-3.10.3-1].
*/
throw new Exception('Missing topics!');
}
$buffer = "";
# Payload
foreach ($this->topics as $topic) {
$buffer .= Utility::PackStringWithLength($topic);
}
return $buffer;
}
protected function payload()
{
if (empty($this->topics)) {
/*
The payload of a SUBSCRIBE packet MUST contain at least one Topic Filter / QoS pair.
A SUBSCRIBE packet with no payload is a protocol violation [MQTT-3.8.3-3]
*/
throw new Exception('Missing topics!');
}
$buffer = "";
# Payload
foreach ($this->topics as $topic => $qos_max) {
$buffer .= Utility::PackStringWithLength($topic);
$buffer .= chr($qos_max);
}
return $buffer;
}
/**
* PUBLISH Variable Header
*
* Topic Name, Packet Identifier
*
* @return string
* @throws Exception
*/
protected function buildVariableHeader()
{
$header = '';
$topic = $this->message->getTopic();
# Topic
$header .= Utility::PackStringWithLength($topic);
Debug::Log(Debug::DEBUG, 'Message PUBLISH: topic=' . $topic);
Debug::Log(Debug::DEBUG, 'Message PUBLISH: QoS=' . $this->getQos());
Debug::Log(Debug::DEBUG, 'Message PUBLISH: DUP=' . $this->getDup());
Debug::Log(Debug::DEBUG, 'Message PUBLISH: RETAIN=' . $this->getRetain());
# Message ID if QoS > 0
if ($this->getQos()) {
if (!$this->msgid) {
throw new Exception('MsgID MUST be set if QoS is not 0.');
}
$header .= $this->packPacketIdentifer();
}
return $header;
}
/**
* Build Variable Header
*
* @return string
*/
protected function buildVariableHeader()
{
$buffer = "";
# Protocol Name
if ($this->message->mqtt->version() == MQTT::VERSION_3_1_1) {
$buffer .= Utility::PackStringWithLength('MQTT');
} else {
$buffer .= Utility::PackStringWithLength('MQIsdp');
}
# End of Protocol Name
# Protocol Level
$buffer .= chr($this->message->mqtt->version());
# Connect Flags
# Set to 0 by default
$var = 0;
# clean session
if ($this->clean) {
$var |= 0x2;
}
# Will flags
if ($this->message->will) {
$var |= $this->message->will->get();
}
# User name flag
if ($this->message->username != NULL) {
$var |= 0x80;
}
# Password flag
if ($this->message->password != NULL) {
$var |= 0x40;
}
$buffer .= chr($var);
# End of Connect Flags
# Keep alive: unsigned short 16bits big endian
$buffer .= pack('n', $this->keepalive);
return $buffer;
}
protected function payload()
{
$payload = '';
$payload .= Utility::PackStringWithLength($this->mqtt->clientid);
# Adding Connect Will
if ($this->will && $this->will->get()) {
/*
If the Will Flag is set to 0 the Will QoS and Will Retain fields in the Connect Flags
MUST be set to zero and the Will Topic and Will Message fields MUST NOT be present in
the payload [MQTT-3.1.2-11].
*/
$payload .= Utility::PackStringWithLength($this->will->getTopic());
$payload .= Utility::PackStringWithLength($this->will->getMessage());
}
# Append Username
if ($this->username != NULL) {
$payload .= Utility::PackStringWithLength($this->username);
}
# Append Password
if ($this->password != NULL) {
$payload .= Utility::PackStringWithLength($this->password);
}
return $payload;
}
