Intro I’ve been trying out various technologies for my temperature monitoring project, but all of them have been more or less unstable. The python solution is by far the most robust, but can lose connection to the MQTT broker, and stubbornly refuse to reconnect by itself. The Node-RED solution is, while fast to write, notoriously unstable regarding MQTT connections. Connections sit “idle” showing a connected state, while in fact they are disconnected, and there is no obvious way of reconnecting it - apart from restarting the docker container. [Read More]
Temperature monitoring with Node-RED
Monitoring temperatures with a Raspberry Pi.
I recently got into a discussion about dogs, kennels and temeratures. I have a German Shepherd, and he has a nice insulated dog house in his kennel, and the discussion was along the lines, how much heat does it take to warm up the doghouse, if it gets hotter than the outside at all. Now, a normal person would have solved this by putting a wireless meat thermometer in the doghouse, made a few readings of it with/without the dog, and compare it to the outside temperature. [Read More]
Sending notifications with MQTT and Pushover.net
I’ve improved a bit on my Pushover.net setup, described in this previous article. I started using MQTT, namely the Mosquitto broker for sending data to/from my machines, instead of the old point-to-point setup i was using. MQTT provides publish/subscribe, with messages up to 256MB each. It also features QoS, ranging from 0 - which basically just means the message was sent on the network, to 2, where you have guaranteed delivery of messages to the broker. [Read More]