<?php
/**
*
* PHP version 5.5
*
* @author Sergey V.Kuzin <*****@*****.**>
* @license MIT
*/
require __DIR__ . '/../vendor/autoload.php';
$mqtt = new \MQTT\spMQTT('tcp://127.0.0.1:1883/');
\MQTT\spMQTTDebug::Enable();
//$mqtt->setAuth('sskaje', '123123');
$connected = $mqtt->connect();
if (!$connected) {
die("Not connected\n");
}
$mqtt->ping();
//$msg = str_repeat('1234567890', 209716);
$msg = str_repeat('1234567890', 2);
# mosquitto_sub -t 'sskaje/#' -q 1 -h test.mosquitto.org
$mqtt->publish('sskaje/test', $msg, 0, 1, 0, 1);
$msg = str_repeat('привет ', 2);
# mosquitto_sub -t 'sskaje/#' -q 1 -h test.mosquitto.org
$mqtt->publish('sskaje/test', $msg, 0, 1, 0, 1);
/**
* Send packet
*
* @return int
*/
public function write()
{
$this->mqtt->getLogger()->debug('Message write: message_type=' . $this->message_type);
$length = 0;
$message = $this->build($length);
$bytes_written = $this->mqtt->socket_write($message, $length);
$this->mqtt->getLogger()->debug('Message write: message=' . spMQTTDebug::printHex($message, true));
$this->mqtt->getLogger()->debug('Message write: bytes written=' . $bytes_written);
return $bytes_written;
}
/**
* loop
* @param callback $callback function(spMQTT $mqtt, $topic, $message)
* @throws \Exception
*/
public function loop($callback)
{
$this->logger->debug(__METHOD__);
if (empty($this->topics) && empty($this->topics_to_subscribe)) {
$this->logger->critical('No topic subscribed/to be subscribed');
throw new \LogicException('No topic subscribed/to be subscribed', 100601);
}
$last_subscribe_msgid = 0;
$last_subscribe_qos = array();
$last_unsubscribe_msgid = 0;
while (1) {
# Subscribe topics
if (!empty($this->topics_to_subscribe)) {
list($last_subscribe_msgid, $last_subscribe_qos) = $this->do_subscribe();
}
# Unsubscribe topics
if (!empty($this->topics_to_unsubscribe)) {
$last_unsubscribe_msgid = $this->do_unsubscribe();
}
if (!$this->socket || !$this->checkAndPing()) {
$this->logger->error('loop(): EOF detected');
$this->reconnect();
$this->subscribe($this->topics);
}
$sockets = array($this->socket);
$w = $e = null;
if (stream_select($sockets, $w, $e, $this->keepalive / 2)) {
if (feof($this->socket) || !$this->checkAndPing()) {
$this->logger->error('loop(): EOF detected');
$this->reconnect();
$this->subscribe($this->topics);
}
# The maximum value of remaining length is 268 435 455, FF FF FF 7F.
# In most cases, 4 bytes is enough for fixed header and remaining length.
# For PUBREL and UNSUBACK, 4 bytes is the maximum length.
# For SUBACK, QoS list should be checked.
# So, read the first 4 bytes and try to figure out the remaining length,
# then read else.
# read 4 bytes
$read_bytes = 4;
$read_message = $this->socket_read($read_bytes);
if (empty($read_message)) {
continue;
}
$cmd = $this->unpackCommand(ord($read_message[0]));
$message_type = $cmd['message_type'];
$dup = $cmd['dup'];
$qos = $cmd['qos'];
$retain = $cmd['retain'];
$this->logger->debug(__METHOD__, ['message_type' => $message_type, 'dup' => $dup, 'QoS' => $qos, 'RETAIN' => $retain]);
$flag_remaining_length_finished = 0;
for ($i = 1; isset($read_message[$i]); $i++) {
if (ord($read_message[$i]) < 0x80) {
$flag_remaining_length_finished = 1;
break;
}
}
if (empty($flag_remaining_length_finished)) {
# read 3 more bytes
$read_message .= $this->socket_read(3);
}
$pos = 1;
$len = $pos;
$remaining_length = $this->remainingLengthDecode($read_message, $pos);
if ($flag_remaining_length_finished) {
$to_read = $remaining_length - (3 + $len - $pos);
} else {
$to_read = $remaining_length - 2;
}
$this->logger->debug(__METHOD__, ['remaining length' => $remaining_length, 'to read' => $to_read]);
$read_message .= $this->socket_read($to_read);
$this->logger->debug(__METHOD__, ['message' => spMQTTDebug::printHex($read_message, true)]);
switch ($message_type) {
# Process PUBLISH
case spMQTTMessageType::PUBLISH:
$this->logger->debug('loop(): PUBLISH');
# topic length
$topic_length = $this->toUnsignedShort(substr($read_message, $pos, 2));
$pos += 2;
# topic content
$topic = substr($read_message, $pos, $topic_length);
$pos += $topic_length;
# PUBLISH QoS 0 doesn't have msgid
if ($qos > 0) {
$msgid = $this->toUnsignedShort(substr($read_message, $pos, 2));
$pos += 2;
}
# message content
$message = substr($read_message, $pos);
if ($qos == 0) {
$this->logger->debug('loop(): PUBLISH QoS=0 PASS');
# Do nothing
} elseif ($qos == 1) {
# PUBACK
$pubackobj = $this->getMessageObject(spMQTTMessageType::PUBACK);
$pubackobj->setDup($dup);
$pubackobj->setMsgID($msgid);
$puback_bytes_written = $pubackobj->write();
$this->logger->debug('loop(): PUBLISH QoS=1 PUBACK written=' . $puback_bytes_written);
} elseif ($qos == 2) {
# PUBREC
$pubrecobj = $this->getMessageObject(spMQTTMessageType::PUBREC);
$pubrecobj->setDup($dup);
$pubrecobj->setMsgID($msgid);
$pubrec_bytes_written = $pubrecobj->write();
$this->logger->debug('loop(): PUBLISH QoS=2 PUBREC written=' . $pubrec_bytes_written);
} else {
# wrong packet
$this->logger->error('loop(): PUBLISH Invalid QoS');
}
# callback
call_user_func($callback, $this, $topic, $message);
break;
# Process PUBREL
# Process PUBREL
case spMQTTMessageType::PUBREL:
$this->logger->debug('loop(): PUBREL');
$msgid = $this->toUnsignedShort(substr($read_message, $pos, 2));
$pos += 2;
# PUBCOMP
$pubcompobj = $this->getMessageObject(spMQTTMessageType::PUBCOMP);
$pubcompobj->setDup($dup);
$pubcompobj->setMsgID($msgid);
$pubcomp_bytes_written = $pubcompobj->write();
$this->logger->debug('loop(): PUBREL QoS=2 PUBCOMP written=' . $pubcomp_bytes_written);
break;
# Process SUBACK
# Process SUBACK
case spMQTTMessageType::SUBACK:
$this->logger->debug('loop(): SUBACK');
$msgid = $this->toUnsignedShort(substr($read_message, $pos, 2));
$pos += 2;
$qos_list = array();
for ($i = $pos; isset($read_message[$i]); $i++) {
# pick bit 0,1
$qos_list[] = ord($read_message[$i]) & 0x3;
}
# check msg id & qos payload
if ($msgid != $last_subscribe_msgid) {
$this->logger->debug('loop(): SUBACK message identifier mismatch: ' . $msgid . ':' . $last_subscribe_msgid);
} else {
$this->logger->debug('loop(): SUBACK msgid=' . $msgid);
}
if ($last_subscribe_qos != $qos_list) {
$this->logger->debug('loop(): SUBACK returned qos list doesn\'t match SUBSCRIBE');
}
break;
# Process UNSUBACK
# Process UNSUBACK
case spMQTTMessageType::UNSUBACK:
$this->logger->debug('loop(): UNSUBACK');
$msgid = $this->toUnsignedShort(substr($read_message, $pos, 2));
$pos += 2;
# TODO:???
if ($msgid != $last_unsubscribe_msgid) {
$this->logger->debug('loop(): UNSUBACK message identifier mismatch ' . $msgid . ':' . $last_unsubscribe_msgid);
} else {
$this->logger->debug('loop(): UNSUBACK msgid=' . $msgid);
}
break;
}
}
}
}
