https://www.worldscientific.com/doi/pdf/10.1142/S0129065720500185

Paper which uses an EEG setup with one channel and MQTT, compares it to a setup with OpenBCI Cyton, and compares brainwaves when eyes are open vs brainwaves when eyes are closed.

The OpenBCI WIFI shield already supports MQTT:

OpenBCI Wifi Shield allows to stream data over TCP or MQTT

BCI Based Home Automation using User Controlled Blinks