my phpMQTT class :
<?php
/*
phpMQTT
A simple php class to connect/publish/subscribe to an MQTT broker
*/
/*
Licence
Copyright (c) 2010 Blue Rhinos Consulting | Andrew Milsted
and...@bluerhinos.co.uk | http://www.bluerhinos.co.uk
Permission is hereby granted, free of charge, to any person obtaining a
copy
of this software and associated documentation files (the "Software"), to
deal
in the Software without restriction, including without limitation the
rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or
sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included
in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
IN
THE SOFTWARE.
*/
/* phpMQTT */
class phpMQTT {
private $socket; /* holds the socket */
private $msgid = 1; /* counter for message id */
public $keepalive = 10; /* default keepalive timmer */
public $timesinceping; /* host unix time, used to detect
disconects */
public $topics = array(); /* used to store currently subscribed
topics */
public $debug = false; /* should output debug messages */
public $address; /* broker address */
public $port; /* broker port */
public $clientid; /* client id sent to brocker */
public $will; /* stores the will of the
client */
private $username; /* stores username */
private $password; /* stores password */
function __construct($address, $port, $clientid){
$this->broker($address, $port, $clientid);
}
/* sets the broker details */
function broker($address, $port, $clientid){
$this->address = $address;
$this->port = $port;
$this->clientid = $clientid;
}
function connect_auto($clean = true, $will = NULL, $username = NULL,
$password = NULL){
while($this->connect($clean, $will, $username,
$password)==false){
sleep(10);
}
return true;
}
/* connects to the broker
inputs: $clean: should the client send a clean session flag */
function connect($clean = true, $will = NULL, $username = NULL,
$password =
NULL){
if($will) $this->will = $will;
if($username) $this->username = $username;
if($password) $this->password = $password;
$address = gethostbyname($this->address);
$this->socket = fsockopen($address, $this->port, $errno,
$errstr, 60);
if (!$this->socket ) {
if($this->debug) error_log("fsockopen() $errno, $errstr
\n");
return false;
}
stream_set_timeout($this->socket, 5);
stream_set_blocking($this->socket, 0);
$i = 0;
$buffer = "";
$buffer .= chr(0x00); $i++;
$buffer .= chr(0x06); $i++;
$buffer .= chr(0x4d); $i++;
$buffer .= chr(0x51); $i++;
$buffer .= chr(0x49); $i++;
$buffer .= chr(0x73); $i++;
$buffer .= chr(0x64); $i++;
$buffer .= chr(0x70); $i++;
$buffer .= chr(0x03); $i++;
//No Will
$var = 0;
if($clean) $var+=2;
//Add will info to header
if($this->will != NULL){
$var += 4; // Set will flag
$var += ($this->will['qos'] << 3); //Set will qos
if($this->will['retain']) $var += 32; //Set will
retain
}
if($this->username != NULL) $var += 128; //Add username
to header
if($this->password != NULL) $var += 64; //Add password to header
$buffer .= chr($var); $i++;
//Keep alive
$buffer .= chr($this->keepalive >> 8); $i++;
$buffer .= chr($this->keepalive & 0xff); $i++;
$buffer .= $this->strwritestring($this->clientid,$i);
//Adding will to payload
if($this->will != NULL){
$buffer .=
$this->strwritestring($this->will['topic'],$i);
$buffer .=
$this->strwritestring($this->will['content'],$i);
}
if($this->username) $buffer .=
$this->strwritestring($this->username,$i);
if($this->password) $buffer .=
$this->strwritestring($this->password,$i);
$head = " ";
$head{0} = chr(0x10);
$head{1} = chr($i);
fwrite($this->socket, $head, 2);
fwrite($this->socket, $buffer);
$string = $this->read(4);
if(ord($string{0})>>4 == 2 && $string{3} == chr(0)){
if($this->debug) echo "Connected to Broker\n";
}else{
error_log(sprintf("Connection failed! (Error: 0x%02x
0x%02x)\n",
ord($string{0}),ord($string{3})));
return false;
}
$this->timesinceping = time();
return true;
}
/* read: reads in so many bytes */
function read($int = 8192, $nb = false){
// print_r(socket_get_status($this->socket));
$string="";
$togo = $int;
if($nb){
return fread($this->socket, $togo);
}
while (!feof($this->socket) && $togo>0) {
$fread = fread($this->socket, $togo);
$string .= $fread;
$togo = $int - strlen($string);
}
return $string;
}
/* subscribe: subscribes to topics */
function subscribe($topics, $qos = 0){
$i = 0;
$buffer = "";
$id = $this->msgid;
$buffer .= chr($id >> 8); $i++;
$buffer .= chr($id % 256); $i++;
foreach($topics as $key => $topic){
$buffer .= $this->strwritestring($key,$i);
$buffer .= chr($topic["qos"]); $i++;
$this->topics[$key] = $topic;
}
$cmd = 0x80;
//$qos
$cmd += ($qos << 1);
$head = chr($cmd);
$head .= chr($i);
fwrite($this->socket, $head, 2);
fwrite($this->socket, $buffer, $i);
$string = $this->read(2);
$bytes = ord(substr($string,1,1));
$string = $this->read($bytes);
}
/* ping: sends a keep alive ping */
function ping(){
$head = " ";
$head = chr(0xc0);
$head .= chr(0x00);
fwrite($this->socket, $head, 2);
if($this->debug) echo "ping sent\n";
}
/* disconnect: sends a proper disconect cmd */
function disconnect(){
$head = " ";
$head{0} = chr(0xe0);
$head{1} = chr(0x00);
fwrite($this->socket, $head, 2);
}
/* close: sends a proper disconect, then closes the socket */
function close(){
$this->disconnect();
fclose($this->socket);
}
/* publish: publishes $content on a $topic */
function publish($topic, $content, $qos = 0, $retain = 0){
$i = 0;
$buffer = "";
$buffer .= $this->strwritestring($topic,$i);
//$buffer .= $this->strwritestring($content,$i);
if($qos){
$id = $this->msgid++;
$buffer .= chr($id >> 8); $i++;
$buffer .= chr($id % 256); $i++;
}
$buffer .= $content;
$i+=strlen($content);
$head = " ";
$cmd = 0x30;
if($qos) $cmd += $qos << 1;
if($retain) $cmd += 1;
$head{0} = chr($cmd);
$head .= $this->setmsglength($i);
fwrite($this->socket, $head, strlen($head));
fwrite($this->socket, $buffer, $i);
}
/* message: processes a recieved topic */
function message($msg){
$tlen = (ord($msg{0})<<8) + ord($msg{1});
$topic = substr($msg,2,$tlen);
$msg = substr($msg,($tlen+2));
$found = 0;
foreach($this->topics as $key=>$top){
if( preg_match("/^".str_replace("#",".*",
str_replace("+","[^\/]*",
str_replace("/","\/",
str_replace("$",'\$',
$key))))."$/",$topic) ){
if(function_exists($top['function'])){
call_user_func($top['function'],$topic,$msg);
$found = 1;
}
}
}
if($this->debug && !$found) echo "msg recieved but no
match in
subscriptions\n";
}
/* proc: the processing loop for an "allways on" client
set true when you are doing other stuff in the loop good for
watching
something else at the same time */
function proc( $loop = true){
if(1){
$sockets = array($this->socket);
$w = $e = NULL;
$cmd = 0;
//$byte = fgetc($this->socket);
if(feof($this->socket)){
if($this->debug) echo "eof receive going to
reconnect for good
measure\n";
fclose($this->socket);
$this->connect_auto(false);
if(count($this->topics))
$this->subscribe($this->topics);
}
$byte = $this->read(1, true);
if(!strlen($byte)){
if($loop){
usleep(100000);
}
}else{
$cmd = (int)(ord($byte)/16);
if($this->debug) echo "Recevid: $cmd\n";
$multiplier = 1;
$value = 0;
do{
$digit = ord($this->read(1));
$value += ($digit & 127) * $multiplier;
$multiplier *= 128;
}while (($digit & 128) != 0);
if($this->debug) echo "Fetching: $value\n";
if($value)
$string = $this->read($value,"fetch");
if($cmd){
switch($cmd){
case 3:
$this->message($string);
break;
}
$this->timesinceping = time();
}
}
if($this->timesinceping < (time() - $this->keepalive )){
if($this->debug) echo "not found something so
ping\n";
$this->ping();
}
if($this->timesinceping<(time()-($this->keepalive*2))){
if($this->debug) echo "not seen a package in a
while, disconnecting\n";
fclose($this->socket);
$this->connect_auto(false);
if(count($this->topics))
$this->subscribe($this->topics);
}
}
return 1;
}
/* getmsglength: */
function getmsglength(&$msg, &$i){
$multiplier = 1;
$value = 0 ;
do{
$digit = ord($msg{$i});
$value += ($digit & 127) * $multiplier;
$multiplier *= 128;
$i++;
}while (($digit & 128) != 0);
return $value;
}
/* setmsglength: */
function setmsglength($len){
$string = "";
do{
$digit = $len % 128;
$len = $len >> 7;
// if there are more digits to encode, set the top bit of
this digit
if ( $len > 0 )
$digit = ($digit | 0x80);
$string .= chr($digit);
}while ( $len > 0 );
return $string;
}
/* strwritestring: writes a string to a buffer */
function strwritestring($str, &$i){
$ret = " ";
$len = strlen($str);
$msb = $len >> 8;
$lsb = $len % 256;
$ret = chr($msb);
$ret .= chr($lsb);
$ret .= $str;
$i += ($len+2);
return $ret;
}
function printstr($string){
$strlen = strlen($string);
for($j=0;$j<$strlen;$j++){
$num = ord($string{$j});
if($num > 31)
$chr = $string{$j}; else $chr = " ";
printf("%4d: %08b : 0x%02x : %s
\n",$j,$num,$num,$chr);
}
}
}
?>
--
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