Out of the box your connection to node-red is insecure. If you are exposing node-red to the Internet or just want a more secure installation then you can: Enforce an SSL connection. Require Username and Password Authentication
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Logging MQTT Sensor Data -Notes
Data from sensors will need to be stored. But how much data do you really need to store? Many sensors like state sensors (ON/OFF), temperature etc will fluctuate very little over the course of a day so does it makes sense to store the same sensor value every x seconds?
Continue readingLogging MQTT Sensor Data to SQL DataBase With Python
Most MQTT brokers don’t provide any mechanism for logging historical data. In this project we will create a simple data logger that logs data to a sqlite database.
Continue readingNode-Red Setup and Admin Notes
Note: Working Notes Node red uses a settings file called settings.js located in in the user .node-re folder in their home directory. You can create your own settings file and customise it either by copying the existing file or using the file available from Github here. On Linux the settings.js file is copied from the /usr/lib/node-modules/node-red/ folder to your .node-red folder in your home directory when you start node-red and no settings.js file is present. On windows if no settings.js file is present in the home folder then the node-red start process stops with an error. To use your own
Continue readingStoring Data in Node-Red Variables
Node-red nodes pass the msg object between nodes. However this object is replaced by the next msg object. So how do you store data between node calls? Node-Red provides three mechanisms: The context object -stores data for a node The Flow object – stores data for a flow The global object -stores data for the canvas
Continue readingUnderstanding The Node-Red Message Object
A node red flow consists of a series of interconnected nodes.(wired nodes). All nodes must have an input and can have 0 or multiple outputs. Nodes exchange data between each other using the msg object.
Continue readingMQTT-SN RSMB Broker Install and Configuration
Important Note: The RSMB broker is no longer being actively developed. There is an MQTT-SN t MQTT Gateway available that is in active development and being supoorted by the original author or the RSMB broker (Ian Graggs). This post contains the details as well as links to download the gateway and embedded C client. You can download the RSMB ( Really small message broker here here. Unzip it. When you unzip it you should see a directory structure like the one below:
Continue readingUsing The Python MQTT-SN Client
There is a Python client included with the RSMB src files. You can download the RSMB ( Really small message broker here here. The client is written in python2.7 and consists of 4 files. The MQTTSN.py handles the packet packing and unpacking, and you don’t need to edit this.
Continue readingUnderstanding IP Multicasting
What is IP Multicasting? -IP multicasting allows a host to send a single packet to thousands of hosts across a routed network i.e. The Internet. It is used mainly for audio (radio) and video distribution. In Networking a packet can be sent to: A single host –Unicast = (TCP and UDP) All hosts -Broadcast – (UDP only) A group of hosts – Multicast -(UDP only)
Continue readingHow to Install The Mosquitto Broker Windows XP
From version 1.5 support for Windows XP was dropped. If you need to install the mosquitto MQTT broker (server) on Windows XP then you will need an older version of mosquitto.
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