This is an example based on the mysensors ESP8266 gateway on a NodeMCU with a nRF, on which I've also added; an OLED screen and a DHT11 and I have it forwarding both external and internal sensor values directly to a cloud service (e.g. to Thingspeak) without using a controller. more details here: http://forum.mysensors.org/topic/1973/esp8266-as-wifi-gateway-controller-node