I just published a #micropython #mqtt server and #python client for accessing a remote filesystem on a micropython device by mqtt.
See:
https://github.com/dov/upython-mqtt-file-server
Meanwhile I have used it for uploading photos to my #pimoroni #presto device.
This library solves the "grandma problem" of how to place a photo frame on grandma's mantle piece and push images to it without her interaction.
