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The Wallboard Brightsign client can handle simple sensors through GPIO via

If input buttons are attached and pressed they send GPIO_X_ON or GPIO_X_OFF messages to the content when a button is pressed or released, where X is a number between 0 and 7 according to which port the pressed button is attached to.

If the content sends messages in the same format described at inputs, the client will configure the port which received an event as output, and set it’s pin’s value to either 0 or 1, so if a suitable display is attached it should show the received value.

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