N00b + MQTT gw + openHAB2

[ericvdb]

@gohan said in N00b + MQTT gw + openHAB2:

but anyway ethernet is the best solution for beginners because you can use myscontroller to debug messages while connected to controller.

With MQTT you can also debug using MQTT-Spy or MQTTLens or various other MQTT apps.

MQTT is easy in interconnecting various systems without they have to know about each-other.

As long as you have a MQTT broker (RabbitMQ, Mosquitto, ActiveMQ, ...) you're all set.

In OpenHab in conf/services create a file called mqtt.cfg, and past the following:

mqtt:broker.url=tcp://ip-address-of-mqttbroker:1883
mqtt:broker.clientId=openhab
mqtt:broker.retain=true
mqtt:broker.async=false

Then in your items file you can do:

Switch Light_GV_Hall    			"Ceiling"       	(GV_Hall, Lights) {mqtt=">[broker:myhome/room/switch1:command:ON:1],>[broker:myhome/room/switch1:command:OFF:0],<[broker:myhome/room/switch1:state:ON:1],<[broker:myhome/room/switch1:state:OFF:0"}

And now you can turn on/off the light from OpenHab as wel as from any other device that publishes to the same toppic (yes, even from MQTT-Spy and MQTTLens)

[gohan]

@ericvdb I know, I am talking for a beginner perspective. The more advanced users know how to debug over mqtt and stuff

[MasMat]

Update.
After much trying the Ethernet gw would not connect to Domoticz.
Then, tried my mqtt sketch again and presto! I have connection AND I can control the two relays on board the mqtt-gw.
Had a cold one...or four!
Thanks for the recommendations and help. I'm sure I will need more later on. Now I'm going to explore the Domoticz forum for answers.
Unless someone with the same setup can tell me why the lights are crossed (on = off in reality and off=light on)?

[gohan]

Depends on relay board

[MasMat]

I just have the modules. low=relay on.
I think it would be easier to change it in Domoticz or do I have to change it in the sketches (I think this will be more work when I add new sensors and relays)?

[gohan]

Just do everything in code so you present relay status not pin status

[MasMat]

@gohan How do I do that? I tried reversing the:
#define RELAY_ON 0 // GPIO value to write to turn on attached relay
#define RELAY_OFF 1 // GPIO value to write to turn off attached relay

I switched around the 0 and 1 but no real change...

[gohan]

Did you get a debug log where you actually see the node receiving the message to change the relay status? Because setting the defines as you said should be correct

[MasMat]

I see the mqtt message going out. I have to double check the 0 vs 1 in the messages.

I'm about to build another sensor that has only relays. So I will troubleshoot this code & mqtt to make it match.

[gohan]

Actually I mean the serial debug of the node, not the mqtt log

[MasMat]

@gohan gonna examine that too before actually hooking it up. Thanks