Add esp8266

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In the code, search for this function:

CAYENNE_OUT_DEFAULT()
{
	// Write data to Cayenne here. This example just sends the current uptime in milliseconds on virtual channel 0.
	Cayenne.virtualWrite(0, millis());
	// Some examples of other functions you can use to send data.
	//Cayenne.celsiusWrite(1, 22.0);
	//Cayenne.luxWrite(2, 700);
	//Cayenne.virtualWrite(3, 50, TYPE_PROXIMITY, UNIT_CENTIMETER);
}

this function publishes data (millis()) to cayenne on channel number 0.

Have a look at this topic to get started with cayenne Adding a New Device using MQTT and also go the through entire docs Cayenne Docs