From MQTT - Guide | OpenEnergyMonitor
When SSH in to the emonpi i am unable to run the command mosquitto_sub
-bash: mosquitto_sub: command not found
Also the last paragraph says
To avoid connecting via SSH alternately you could use MQTTlens Chrome Extension or any other MQTT client connected to the emonPi IP address on port 1883 with user name: emonpi
and password: emonpimqtt2016
.
I have had a lot of trouble getting MQTTlens to run. they is another program call http://mqtt-explorer.com/ that works very well. might be worth while updating the guide