Next Steps

Let’s hope that the students now are keen to understand how things work. There are several topics worth investigating:

The MQTT protocol itself.

There are some good resources such as this learning page from Sparkfun and Steves Internet Guide.

Maybe Python programming is worth exploring?

Securing Mosquitto

Securing the MQTT protocol is interesting as well. How it’s done depends on the broker. In this setup Mosquitto is used. ACL’s are discussed here:mosquitto.conf SSL Security is discussed on many pages, such as this one which uses Let’s Encrypt, or this one using Self signed certificates

Diagnosing MQTT problems

There are many tools that you can use to diagnose MQTT. Well know tools include mqtt-spy and MQTT Explorer.

Node RED

Has it’s own page: www.nodered.org.

Docker

Both Mosquitto and Node RED can be run in Docker containers. The latest Raspberry Pi’s are great to learn container basics and more. If you go all the way you can build your own cluster. Check this blog to get started.

Linux

The more we discover, the closer we get to the OS (Raspbian) which is a Linux based OS. Managing the Mosquitto and Node RED services requires knowledge about service managemet.

Updating the server requires OS knowledge and installing software as well.

A good definition of usefull (required?) skills for novices are defined by LPI with the Linux Essentials exam as the proof of the pudding.

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