Thanks for that Ross
Good to hear that it should work with any of the cards
Perhaps me mentioning button confused what I was trying to explain
I just want to trigger an action, and it does not have to be a button as such
I have it working with a switch card but not with a string card
This is exactly what I was trying to do
I initially setup a switch card and that works fine and the MQTT message is published and everything works fine, but does not make visual sense as this is an on/off scenario but an MQTT push to control something at the other end, ie take a picture from the camera
If I change that from the switch to a string card, with everything setup up the same as for the switch, the MQTT publish does not happen when I click on the string and I cannot see why that is
Currently, the MQTT publish does not need a payload as it is just the subscribed topic that causes the camera node to take a picture and publish the image which is then picked up by my OH page in an image card