emqx-sn

EMQ X MQTT-SN Gateway.

Configure Plugin

File: etc/emqx_sn.conf

## The UDP port which emq-sn is listening on.
##
## Value: IP:Port | Port
##
## Examples: 1884, 127.0.0.1:1884, ::1:1884
mqtt.sn.port = 1884

## The duration(seconds) that emq-sn broadcast ADVERTISE message through.
##
## Value: Second
mqtt.sn.advertise_duration = 900

## The MQTT-SN Gateway id in ADVERTISE message.
##
## Value: Number
mqtt.sn.gateway_id = 1

## To control whether write statistics data into ETS table for dashbord to read.
##
## Value: on | off
mqtt.sn.enable_stats = off

## To control whether accept and process the received publish message with qos=-1.
##
## Value: on | off
mqtt.sn.enable_qos3 = off

## The pre-defined topic name corresponding to the pre-defined topic id of N.
## Note that the pre-defined topic id of 0 is reserved.
mqtt.sn.predefined.topic.0 = reserved
mqtt.sn.predefined.topic.1 = /predefined/topic/name/hello
mqtt.sn.predefined.topic.2 = /predefined/topic/name/nice

## Default username for MQTT-SN. This parameter is optional. If specified,
## emq-sn will connect EMQ core with this username. It is useful if any auth
## plug-in is enabled.
##
## Value: String
mqtt.sn.username = mqtt_sn_user

## This parameter is optional. Pair with username above.
##
## Value: String
mqtt.sn.password = abc

• mqtt.sn.port
  • The UDP port which emqx-sn is listening on.
• mqtt.sn.advertise_duration
  • The duration(seconds) that emqx-sn broadcast ADVERTISE message through.
• mqtt.sn.gateway_id
  • Gateway id in ADVERTISE message.
• mqtt.sn.enable_stats
  • To control whether write statistics data into ETS table for dashbord to read.
• mqtt.sn.enable_qos3
  • To control whether accept and process the received publish message with qos=-1.
• mqtt.sn.predefined.topic.N
  • The pre-defined topic name corresponding to the pre-defined topic id of N. Note that the pre-defined topic id of 0 is reserved.
• mqtt.sn.username
  • This parameter is optional. If specified, emqx-sn will connect EMQX core with this username. It is useful if any auth plug-in is enabled.
• mqtt.sn.password
  • This parameter is optional. Pair with username above.

Load Plugin

./bin/emqx_ctl plugins load emqx_sn

Client

NOTE

• Topic ID is per-client, and will be cleared if client disconnected with broker or keepalive failure is detected in broker.
• Please register your topics again each time connected with broker.

Library

• https://github.com/eclipse/paho.mqtt-sn.embedded-c/
• https://github.com/ty4tw/MQTT-SN
• https://github.com/njh/mqtt-sn-tools
• https://github.com/arobenko/mqtt-sn

sleeping device

PINGREQ must have a ClientId which is identical to the one in CONNECT message. Without ClientId, emqx-sn will ignore such PINGREQ.

pre-defined topics

The mapping of a pre-defined topic id and topic name should be known inadvance by both client's application and gateway. We define this mapping info in emqx_sn.conf file, and which shall be kept equivalent in all client's side.

License

Apache License Version 2.0

Author

EMQ X-Men Team.