IOT News

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Run-Time Provisioning of Security Credentials for IoT Devices

Interested article in Electronic design about configuring IOT devices with security credentials.

The first part gives a good overview of the problem on using certificates in the hardware and then goes on to cover a software based approach.

Although I still find the solution too complex it is certainly going to be an important topic in the future. Read it here

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Understanding Networking On The Raspberry PI

Following several questions regarding IP address assignment On the raspberry PI I did some research and testing which I turned into a tutorial you can read here.

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CloudMQTT Free Plans Unavailable

A while ago a published a tutorial on using CloudMQTT and in that tutorial I used their free hosting plan.

Recently CloudMQTT have stopped this plan and I was asked for an alternative.

A that time I had just helped someone with a connection problem to Beebotte and so I needed to sign up using their free plan which you may want to look at as an alternative.

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Republishing Web Pages Over MQTT

Some data currently being published as web pages and sent over http is far more suited for being sent over MQTT.

So what happens to existing applications that publish over http.

Well IMO nothing as it is relatively easy to take this existing data and republish it over MQTT without having to modify the existing application.

Doing it this way would greatly reduce the load on the application server and reduce costs.

A while ago I developed both a python script and a node-red flow to do this if you haven’t seen the tutorial then here it is.

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SSL Certificate revocation

Q- What happens if a server certificate gets stolen?

A- It can be revoked. There are a number of ways that a client(browser) can check if a certificate is revoked see here

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Mosquitto Broker Connections

I have received several questions regarding raspberry pi and Mosquitto . They  are mainly concerned about the pi being able to handle the number of connections.

I ran my broker connection tester on my pi and got 1016 before being denied.

max-tcp-connections-mosquitto

I was curios about this limit as it was mosquitto but the tcp daemon.

It seems that users are only allowed 1024 connections by default and so the user running mosquitto was limited you can change this see here

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Smart Home Simulator

I am creating a smart home simulator on node-red you can read about it on my other site, and download the flow. –Introduction to the smart home simulator

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