Best way to create outbound mqtt message with json content?

[Dim (Angelos)]

Here is one example (there are many in the forum) of a rule sending a json payload to mqtt:

[SOLVED] Send json with mqtt command

Easy: rule "heater time adjust Mode 2" when Item progr received command then //I want to change the payload values like Arm 1 or 0, Mode 1 or 2 etc //but how can i create/compose the json string to send it? because i can't send it with this form above like a simple string var jsonString = "{\"Arm\":" + ArmItem.state.toString jsonString = jsonString + ",\"Mode\":" + modeItem.state.toString jsonString = jsonString + ",\"Time\":\"-2:23\",\"Window\":0,\"Days\":\"11TW11S\",\"Repeat\":1,\"Output\":…

@Ankan

I tried to create this message with javascript and use it in my items-file like this:

[myBroker:domoticz/in:state:*:JS(set_switch.js)]

State is usually used in an inbound configuration in OH2. If you want to send the json payload you will need an outbound config.

See more here: https://www.openhab.org/addons/bindings/mqtt1/#item-configuration-for-outbound-messages