IoThook Industrial Internet of Things Message Queuing Public MQTT broker is free to use. IoThook public MQTT broker industrial machinery or inventors for the IoT devices it developed to send and receive messages to each other. Has been made available Free user to use IoThook public MQTT broker was created. The name of this created user is 'iothookpublic' password is 'iothookpublic'. IoThook uses EMQX broker. IoThook Dashboard Public MQTT Broker is free to use on up to 10 devices. No credit-card required! To use the IoThook Cloud Dashboard MQTT Broker Cloud IoThook You can register at. For code examples and help IoThook please check the address.