我使用mosquitto服务器作为mqtt经纪人.我测试mosquitto的性能,我需要为某些数据订阅$ SYS层次结构,例如当前从$SYS/broker/clients/active主题连接的数量.我有以下mosquitto配置文件.
# Place your local configuration in /etc/mosquitto/conf.d/
#
# A full description of the configuration file is at
# /usr/share/doc/mosquitto/examples/mosquitto.conf.example
pid_file /var/run/mosquitto.pid
persistence true
persistence_location /var/lib/mosquitto/
log_dest file /var/log/mosquitto/mosquitto.log
include_dir /etc/mosquitto/conf.d
listener 1884
protocol websockets
listener 1883
sys_interval 1
max_connections -1
我正在订阅这样的$SYS/broker/clients/active话题
ubuntu@linux-box:/etc/mosquitto$ mosquitto_sub -d -t $SYS/broker/clients/active
Client mosqsub/28715-ip-172-31 sending CONNECT
Client mosqsub/28715-ip-172-31 received CONNACK
Client mosqsub/28715-ip-172-31 sending SUBSCRIBE (Mid: 1, Topic: /broker/clients/active, QoS: 0)
Client mosqsub/28715-ip-172-31 received SUBACK
Subscribed (mid: 1): 0
在 …