HomeAssistant doesn't work with `known_devices`

[gfwilliams]

Discussed at #79

Devices in known_devices don't have their data appearing properly in home assistant.

The fix should:

• Name devices according to their known_devices name
• Respond to /ble/json/devicename not /ble/json/de:vi:ce:ad:dr:es:ss

[G1K]

#77 Check if this PR solves this problem

[Andrwe]

#77 Check if this PR solves this problem

I just tested the docker image werty1st/espruinohub:latest with your code change included but homeassistant still does not see the devices configured in known_devices with changed name.

[twocolors]

@Andrwe try my repo docker

ghcr.io/twocolors/espruinohub:latest