Parameters are JSON encoded and returned in the body of the reply.

GET
	/devices

	Get a list of all devices that can be set/get.
	- id
	  ID of the device. To be used with /get-state/ and /set-state/.
	- description
	  Description of the device: what it is etc.
	- getable
	  True or False - if it has state that can be retrieved.
	- setable
	  True or False - if it has state that can be changed.
	- states
	  A list of possible states that can be returned via /get-state/ or set via /set-state/.


	/device/ID

	Get the state of a device:
		{ "state": "..." }

PATCH
	/device/ID

	Set the state of a device.
	JSON body shall contain:
		{ "state": "..." }
	where "..." is the state to set. Must be one of 'states' from '/devices'. It returns:
		{ "result": true/false }
	to indicate if it succeeded or not.