使用mqtt测试服务器测试mqtt 1884 通信

mqtt 1884 通信采用不加密，但需要验证的方法，登录用户名与密码的参数为-u和-P.

不使用密码登录：

mosquitto_sub -L mqtt://test.mosquitto.org:1884/const.net.cn/ -v 
       

Connection error: Connection Refused: not authorised.
使用密码登录：
mosquitto_sub -L mqtt://test.mosquitto.org:1884/const.net.cn/ -v -u rw -P readwrite

不使用密码时：

mosquitto_pub -L mqtt://test.mosquitto.org:1884/const.net.cn/ -m 'mqtt hello world test.mosquitto.org 1884 : MQTT, unencrypted, authenticated' -d

Client mosq-dZTvqWrOBAwBY0e81Q sending CONNECT
Client mosq-dZTvqWrOBAwBY0e81Q received CONNACK (5)
Connection error: Connection Refused: not authorised.
Client mosq-dZTvqWrOBAwBY0e81Q sending DISCONNECT

使用用户名密码登录：

mosquitto_pub -L mqtt://test.mosquitto.org:1884/const.net.cn/ -m 'mqtt hello world test.mosquitto.org 1884 : MQTT, unencrypted, authenticated' -d -u rw -P readwrite

Client mosq-euDtfmG2k4QCjlSt9g sending CONNECT
Client mosq-euDtfmG2k4QCjlSt9g received CONNACK (0)
Client mosq-euDtfmG2k4QCjlSt9g sending PUBLISH (d0, q0, r0, m1, 'const.net.cn/', ... (75 bytes))
Client mosq-euDtfmG2k4QCjlSt9g sending DISCONNECT

接收到的消息：

mosquitto_sub -L mqtt://test.mosquitto.org:1884/const.net.cn/ -v -u rw -P readwrite

const.net.cn/ mqtt hello world test.mosquitto.org 1884 : MQTT, unencrypted, authenticated
const.net.cn/ mqtt hello world test.mosquitto.org 1884 : MQTT, unencrypted, authenticated

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