Please, proceed carefully following the tips published in this blog, specially when Main Power is involved. I'm not responsible for any damages caused by what is written in this blog.
Thank you

Sunday, 8 October 2017

Home Automation System - Checking TASMOTA firmware updates with OpenHAB v.2

A little post about managing notifications about new TASMOTA firmware versions for SONOFF devices on OpenHAB v.2

As we already know reading the official TASMOTA documentation (https://github.com/arendst/Sonoff-Tasmota/wiki/Upgrade#firmware-binary-sources), @smadds user manages a public MQTT broker "sonoff.maddox.co.uk:1883", where he publishes the last version number of the TASMOTA firmware using topic sonoff-version.

So, in my setup, I just added an "item" linked to this value, through MQTT and then published it on my sitemap.

First thing to do was create a new MQTT connection (called sonoffmaddox-mqtt) to the @smadds broker, appending the following lines to the /etc/openhab2/services/mqtt.cfg file


Then I created a new file called general.itemsin the /etc/openhab2/items folder, in which I wrote down the following line:

String      SonoffTasmotaVersion      "SONOFF Tasmota Version [%s]"     <settings>

My item is called SonoffTasmotaVersion, its type is "String" and it is linked to the mqtt connection called sonoffmaddox-mqtt, topic sonoff-version. In this way, this item will be updated everytime someone will publish new messages on topic sonoff-version.

Last step: I added my new item to the sitemap, just to keep tracking of the last TASMOTA version.
So, I edited the /etc/openhab2/sitemaps/test.sitemap file, inserting, on the top, the item just created inside a frame called "general":

Frame label="General" {
    Text item=SonoffTasmotaVersion

Here is the result:

To be more useful, I created a new OpenHAB rule just to be notified every time the TASMOTA version will be updated.

So, I created the /etc/openhab2/rules/checks.rules file, and wrote down the following lines:

rule "tasmota version check"
Item SonoffTasmotaVersion changed

logInfo("rules", "New Tasmota Version " + SonoffTasmotaVersion.state)

sendNotification([user_to_be_notified], "New Tasmota Version " + SonoffTasmotaVersion.state)


The sendNotification function sends a notification to the specified user; this notification reaches the mobile devices where the OpenHAB App is installed and linked to the OpenHAB cloud (MyOpenHAB). Its configuration is very simple, just following the official guide: http://docs.openhab.org/addons/io/openhabcloud/readme.html

Now I have to wait for the next TASMOTA update just to check that all is working as expected.