Hi @thegpx ,
I worked with @beegee regarding your MQTT problem.
We were able to send downlink via MQTT integration.
You can test it using mosquitto by using this command as template
mosquitto_pub -h 192.168.1.12 -t "application/1/device/1dfb41d379772c52/command/down" -m '{"confirmed":true,"fPort":2,"data":"1234"}' -d
You need to change the 192.168.1.12 to your own IP address as well as the application ID and device EUI.
The data payload should be Base64 encoded as well.