![](https://csdnimg.cn/release/download_crawler_static/87183233/bg4.jpg)
QoS 1 No [23] Yes [19] Yes [20] Yes [21] Yes [22]
QoS 2 No [23] Yes [19] Yes [20] Yes [21] Yes [22]
authentication Per-channel
authoriza-
tion [24]
Username/
Password,
JWT, LDAP,
ClientID, ...
[19]
Username/
Password
[20]
Username/
Password,
Client cer-
tificates
[25]
Password
file*** [22]
$SYS topics No [26] Yes [19] No No Basic $SYS
topics [22]
SSL Yes [24] Yes [19] Yes [20] Yes [21] Yes [22]
Dynamic
topics
Yes Yes [19] Yes Yes Yes
Clustering Yes [24] Yes [19] No No No
Websockets Yes [24] Yes [19] No Yes [27] Yes [22]
Plugin sys-
tem
Unknown Yes [19] No No Yes [22]
Self hosted Possible [28] Yes Yes Yes Yes
License Affero Gen-
eral Public
License
v3 (open
source)[29]
Apache 2.0
license (open
source)[30]
Eclipse Pub-
lic License
v1.0 (open
source)[31]
MIT Li-
cense (open
source)[32]
MIT Li-
cense (open
source)[33]
Broker HiveMQ IBM Mes-
sageSight
IBM Web-
Sphere MQ
Middleware
JoramMQ *4 Mongoose
QoS 0 Yes [34] Yes [35] Yes [36] Yes [37] Yes [38]
QoS 1 Yes [34] Yes [35] Yes [36] Yes [37] Yes [38]
QoS 2 Yes [34] Yes [35] Yes [36] Yes [37] Yes [38]
authentication Username/
Password
[39]
Username/
Password
[40]
Username/
Password,
client certi-
ficate [41]
Yes [37] Yes [42]
$SYS topics Possible with
plugin [43]
Yes [44] Probably yes Yes [37] No
SSL Yes [45] Yes [46] Yes [47] Yes [37] Yes [48]
Dynamic
topics
Yes Yes Yes Yes Yes
2