PHPMQTT v1.4.1 版本发布，新增协议调试工具

public function hexDump(): string // 以16进制显示
public function hexDumpAscii(): string // 以16进制和相应的ASCII字符显示
public function printableText(): string // 可打印字符
public function hexStream(): string // 16进制流
public function ascii(): string // 以ASCII字符显示

use Simps\MQTT\Tools\Debug;
$debug = new Debug('0:simps-mqtt/user001/update{
  "msg": "hello, mqtt"
}');
//$debug = (new Debug())->setEncode('0:simps-mqtt/user001/update{
//  "msg": "hello, mqtt"
//}');
echo $debug->hexDump(), PHP_EOL;
echo $debug->hexDumpAscii(), PHP_EOL;
echo $debug->printableText(), PHP_EOL;
echo $debug->hexStream(), PHP_EOL;
echo $debug->ascii();

use Simps\MQTT\Tools\UnPackTool;
echo UnPackTool::hexDumpAscii('0:simps-mqtt/user001/update{
  "msg": "hello, mqtt"
}');

00000000    30 3a 73 69 6d 70 73 2d 6d 71 74 74 2f 75 73 65    0:simps-mqtt/use
00000010    72 30 30 31 2f 75 70 64 61 74 65 7b 0a 20 20 22    r001/update{.  "
00000020    6d 73 67 22 3a 20 22 68 65 6c 6c 6f 2c 20 6d 71    msg": "hello, mq
00000030    74 74 22 0a 7d                                     tt".}