The Just Add Power 2G+ and 3G platforms support CEC control of the attached devices. While the Just Add Power hardware is capable of sending literally every CEC command in existence, the implementation of the CEC specification is determined by the TV and device manufacturers on a case-by-case basis.
CEC is sent by targeting the unique Transmitter/Receiver connected to the Source/Display. There is no distribution of CEC commands in a standard Just Add Power system.
CEC does NOT pass-through from Transmitter to Receiver. A CEC command from a Source on a Transmitter will not be able to control a Display on a Receiver.
There is no way to know if every model of TV produced by a given manufacturer supports all of the CEC features. Just Add Power Technical Support has attempted to compile a list of well-known TV manufacturers who commonly support (or do not support) the most desirable CEC features, but feature capabilities can change from model to model, and even from firmware to firmware on a single model. We recommend contacting the display manufacturer for CEC compatibility questions.