Free and High Performance MQTT Broker, create for my educational purposes.

About

Golang MQTT Broker, Version 3.1.1, and Compatible for eclipse paho client

RUNNING

$ go run main.go

Usage of broker:

Usage: Go MQTT Broker [options]

Broker Options:
    -w,  --worker <number>            Worker num to process message, perfer (client num)/10. (default 1024)
    -p,  --port <port>                Use port for clients (default: 1883)
         --host <host>                Network host to listen on. (default "0.0.0.0")
    -ws, --wsport <port>              Use port for websocket monitoring
    -wsp,--wspath <path>              Use path for websocket monitoring
    -c,  --config <file>              Configuration file

Logging Options:
    -d, --debug <bool>                Enable debugging output (default false)

Common Options:
    -h, --help                        Show this message

Broker.config

{
	"workerNum": 4096,
	"port": "1883",
	"host": "0.0.0.0",
	"wsPort": "1888",
	"wsPath": "/ws",
	"wsTLS": true,
	"tlsPort": "8883",
	"tlsHost": "0.0.0.0",
	"tlsInfo": {
		"verify": true,
		"caFile": "tls/ca/cacert.pem",
		"certFile": "tls/server/cert.pem",
		"keyFile": "tls/server/key.pem"
	},
	"acl":true,
	"aclConf":"conf/acl.conf"
}

Features and Future

• Supports QOS 0 and 1

• Containerization

• Supports retained messages

• Supports will messages

• Websocket Support

• TLS/SSL Support

• Flexible ACL

ACL Configure

The ACL rules define:

Allow | type | value | pubsub | Topics

ACL Config

## type clientid , username, ipaddr
##pub 1 ,  sub 2,  pubsub 3
## %c is clientid , %u is username
allow      ip          127.0.0.1   2     $SYS/#
allow      clientid    0001        3     #
allow      username    admin       3     #
allow      username    joy         3     /test,hello/world 
allow      clientid    *           1     toCloud/%c
allow      username    *           1     toCloud/%u
deny       clientid    *           3     #

#allow local sub $SYS topic
allow      ip          127.0.0.1   2    $SYS/#

#allow client who's id with 0001 or username with admin pub sub all topic
allow      clientid    0001        3        #
allow      username    admin       3        #

#allow client with the username joy can pub sub topic '/test' and 'hello/world'
allow      username    joy         3     /test,hello/world 

#allow all client pub the topic toCloud/{clientid/username}
allow      clientid    *         1         toCloud/%c
allow      username    *         1         toCloud/%u

#deny all client pub sub all topic
deny       clientid    *         3           #

Client match acl rule one by one

          ---------              ---------              ---------
Client -> | Rule1 | --nomatch--> | Rule2 | --nomatch--> | Rule3 | --> 
          ---------              ---------              ---------
              |                      |                      |
            match                  match                  match
             \|/                    \|/                    \|/
        allow | deny           allow | deny           allow | deny

Online/Offline Notification

 topic:
     $SYS/broker/connection/clients/<clientID>
 payload:
	{"clientID":"client001","online":true/false,"timestamp":"2018-10-25T09:32:32Z"}

Performance

• High throughput

• High concurrency

• Low memory and CPU

License

• Apache License Version 2.0