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What node controller are you using for the harmony-api? If you are using PM2, try taking a look at the logs using "pm2 logs [name of app]". That should give...

You need to add /cmd to your topic. /state reads the state of the device and /cmd publishes to the device. So, for your door, it would be smartthings/Primary Garage/contact/state...

jdyer@ubuntu:~$ mosquitto_pub -u homeassistant -P xxxx -h 192.168.100.14 -t "smartthings/Primary Garage/contact/cmd" -m "closed" That's the correct one, however, I'm not sure what publishing closed to a contact sensor is going...

Ahhhh... Ok. 1. Figure out what your garage door control is named in SmartThings (I'm going to assume it's called Primary Garage). 2. From there, you want to go into...