The invention relates to a power line carrier communication terminal control device,
system and method, in particular, a PLC terminal control device,
system and method. The
control system comprises a PLC
terminal system, a control device and an
MQTT releaser; the control device establishes a PLC connection with the
terminal system and establishes an
Ethernet connection with the releaser. The device is used for receiving a subscription request sent by the PLC
terminal system, wherein the subscription request contains a PLC terminal
system identifier and a theme for controlling the PLC terminal system; the device establishes a corresponding relationship between the theme and the PLC terminal
system identifier in a mapping table according to the subscription request, and sends a subscription response message to the PLC terminal system according to the corresponding relationship, wherein the subscription response message contains the theme; the device receives a control message released by the
MQTT releaser, wherein the control message contains a control word and a theme, wherein the control word is used for controlling operation on the theme; and the device sends the control message to the PLC terminal system according to the corresponding relation. According to the control device, system and method of the invention, a simple, intelligent and flexible Internet-of-things
middleware platform is constructed; and a PLC carries
MQTT messages. The control device, system and method can be applied to scenes which have poor communication conditions or are not suitable for being provided with network cables.