MQTT 2.4 configured in Item files

Setup, Configuration and Use Items & Sitemaps
1

I’ve just upgraded to OpenHab 2.4 running on OpenHabian (rPi 3+) and I’ve had to remove the MQTT1 binding and look at using the MQTT 2 binding - probably about time!

I’ve managed to get most things working again but I’m having problems with my 433Mhz switchable sockets. I have another rPi monitoring a MQTT topic called rff_trx and it will broadcast over 433mhz any code sent via MQTT.

Within openHab I previously had this item configured to post to an OpenHab MQTT1 configured topic

Switch Socket_one       "Socket 1"  [Lighting]    {mqtt=">[mqtt:topic:cf9a9121:rff_trx:ON:1381717],>[mqtt:topic:cf9a9121:rff_trx:OFF:1381716]"}

I can’t work out how to get this working with the new MQTT2 binding. I have a working Broker thing (mqtt:broker:fb711156) and I’ve tested it. Is it possible to send two different codes from a single switch directly from the Items file?

2

I think you need outbound transformations for that, not available in MQTT binding 2.4

3

It’s not possible with 2.4 but there either transform is available in the 2.5 milestones. You could also apply a transform Profile. This is basically a map.

Another option is the latter milestone versions all you to define the mapping like this on the Channel definition itself, no need for the mapping transformation.

I don’t use .things files but in A aoerUI no it’s all there and pretty still explanatory.

4

Regrettably, profiles do not operate on outbound commands.

The channel’s on/off options offer simple transformation for switches, but not for outbound on 2.4