Publishing to a topic for the first time creates the tag as expected, but publishing to it again gets the log message “Invalid tag at path ‘’ - unable to handle payload on custom namespace topic=”. Value changes on the subsequent publish are reflected in the MQTT broker, but not the Ignition tag.
I’m having the same issue with my full version gateway. I have upgraded to 4.0.17-SNAPSHOT (b2023051601) but now the tags are not even created on initial MQTT post. I’ve installed the distributor and transaction snapshots and restarted all MQTT modules. Am I missing something?
I note that you have installed MQTT Distributor and MQTT Transmission - you will also need MQTT Engine installed.
If you have Engine installed and configured with a valid custom namespace and are still running into this issue please open a ticket with firstname.lastname@example.org and include a download of your Ignition logs, an image of your custom namespace configuration and published message topic/payload.