MQTT Topics are UTF-8 strings structured in a hierarchy similar to folders and files in a file system using the forward slash ( / )as a delimiter. To be valid a topic must be at least 1 character long and generally in real world applications they 10s of characters in length. The topic is sent with every message published, and so in order to reduce the length of published messages MQTT-SN uses shorter topic names. it does this by using a variety of topic identifiers in place of standard topic name used in MQTT.
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MQTT-SN RSMB Broker Overview,Install and Configuration
The RSMB MQTT-SN broker written by Ian Craggs of IBM isn’t currently being actively developed, but it is still invaluable for anyone wanting to get experience using MQTT-SN. See What’s happening with RSMB? Where are we with MQTT_SN
Continue readingUsing The Python MQTT-SN Client
The MQTT-SN client used here is the client from the RSMB source files but upgraded to python 3 and modified to work in a similar fashion to the Paho MQTT client. You should note it is still a work in progress so I would be grateful if you would let me know of any problems with it. Downloads are at the end. The client consists of 4 files. You can copy these source files into the site packages folder under a suitable folder (e.g mqtt-sn) or alternatively set the path in your scripts to access the client. Example: sys.path.append(‘c:/python34/steve/mqttsclient/’) Client
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