Invalid characters in HASS configuration

[robin13]

For the unit_of_measurement, the bare % is invalid:

sensor:
  - name: sonoff_th16_02_humidity
    platform: mqtt
    state_topic: sonoff-th16-02/humidity
    unit_of_measurement: %

Should be enclosed with quotes:

    unit_of_measurement: "%"

[mcspr]

Regarding f01f245, there was previous issue with the same change dfa7327 at #850

unit is wrongly quoted in discovery:

[010968] [MQTT] Sending homeassistant/sensor/espurnadev/config => {"name":"espurnadev_humidity","platform":"mqtt","state_topic":"test/espurnadev/humidity","unit_of_measurement":"\"%\""} (PID 12)

ha.config yaml:

sensor:
  - name: espurnadev_humidity
    platform: mqtt
    state_topic: test/espurnadev/humidity
    unit_of_measurement: "%"

I think quoting should happen at ha.config code instead.

sidenote There are sleep-inducing yaml spec rules of what can be without quotes and cannot, becoming yaml language directive instead of string:
http://yaml.org/spec/1.1/current.html#id868988
http://yaml.org/spec/1.1/current.html#id870919

Easier read at camel docs, python yaml lib. ctrl+f for a plain scalar to be a string, it must meet these restrictions:
https://camel.readthedocs.io/en/latest/yamlref.html#scalars

edit current yaml version by pyyaml (which hass uses), direct examples

[xoseperez]

True. I changed that too quick and dirty.