sorry kste, this is not documented yet.
If you want to publish a signal k key value in a topic:
In MQTT tab set username and password and optionally a remote broker address. Then create a topic X type GENERAL.
in Actions tab set a trigger. You can create a Date trigger with the current date. Select your new trigger and add an action "Publish on topic: X". In data field add the signal k key you want to publish on this topic, be sure the signal k key is between angle brackets <navigation.position.latitude>. Select repeat "seconds" and repeat after 1. And you are done, every second your topic X will get the signal k key value and it will be sent to the local and remote brokers.
If you want to publish a signal k key value in a topic:
In MQTT tab set username and password and optionally a remote broker address. Then create a topic X type GENERAL.
in Actions tab set a trigger. You can create a Date trigger with the current date. Select your new trigger and add an action "Publish on topic: X". In data field add the signal k key you want to publish on this topic, be sure the signal k key is between angle brackets <navigation.position.latitude>. Select repeat "seconds" and repeat after 1. And you are done, every second your topic X will get the signal k key value and it will be sent to the local and remote brokers.