Connect fail due to malformed mqtt packet when msg len is larger than 127

[cstang02]

Hello, thanks for providing such a good mqtt client.

I encountered an issue when the remaining length is larger than 127 in the CONNECT COMMAND (by using long clientId, username and password).

The reason is that you are using only 1 byte to present the Remaining Length of the CONNECT COMMAND, while the protocols says we should use 1~4 bytes.

So I changed Client.php's code in 218,

from: $header = chr(0x10).chr($i);
to: $header = $this->createHeader(0x10, $i);

and the problem was fixed.