Uninitialized string offset

[rajeshafor]

Notice: Uninitialized string offset: 0 in C:\xampp\htdocs\websockets\phpMQTT.php on line 121

Notice: Uninitialized string offset: 0 in C:\xampp\htdocs\websockets\phpMQTT.php on line 125

Notice: Uninitialized string offset: 3 in C:\xampp\htdocs\websockets\phpMQTT.php on line 125
Fail or time out.

I'm new to MQTT. Please give solution for it.

[ghost]

I'm also experiencing this and trying to track it down. It looks like $this->read() isn't getting any data from the stream.

[kingtiwns]

phpmqtt only support mqttv3.1 ，not support v3.1.1，you must modify code

//MQTT v3.1.1协议名称长度 4
$buffer .= chr(0x00); $i++;
$buffer .= chr(0x04); $i++;
// 4D 51 54 54 mqtt v3.1.1 协议名称
// 4D 51 49 73 64 70 mqtt v3.0 协议名称
$buffer .= chr(0x4d); $i++;
$buffer .= chr(0x51); $i++;
$buffer .= chr(0x54); $i++;
$buffer .= chr(0x54); $i++;

	//mqtt v3.1.1 协议名称 版本号
	$buffer .= chr(0x04); $i++;

[taroyutao]

@kingtiwns thanks for your great advice.

具体调整如下，是把下面的源码部分

	$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++;

整体替换为下面的形式即可：

	$buffer .= chr(0x00); $i++;
	$buffer .= chr(0x04); $i++;
	$buffer .= chr(0x4d); $i++;
	$buffer .= chr(0x51); $i++;
	$buffer .= chr(0x54); $i++;
	$buffer .= chr(0x54); $i++;
	$buffer .= chr(0x04); $i++;

[bluerhinos]

I am restarting this project so having a clear out of old issues (If you believe this is still valid please reopen)