I get a lot of warnings when I use shellyswitch2 as cover:
- platform: mqtt
name: "Rollladen Kueche"
state_topic: "shellies/shellyswitch-5B2446/roller/0" # Returns open,close while in motion, stop when not moving
command_topic: "shellies/shellyswitch-5B2446/roller/0/command" # Accepts open, close, stop
payload_open: "open"
payload_close: "close"
payload_stop: "stop"
state_open: "open"
state_closed: "close"
retain: true
optimistic: false
qos: 0
WARNINGS
2018-11-28 18:07:57 WARNING (MainThread) [homeassistant.components.cover.mqtt] Payload is not True or False: stop
2018-11-28 18:07:57 WARNING (MainThread) [homeassistant.components.cover.mqtt] Payload is not True or False: stop
2018-11-28 18:07:58 WARNING (MainThread) [homeassistant.components.cover.mqtt] Payload is not True or False: stop
2018-11-28 18:08:00 WARNING (MainThread) [homeassistant.components.cover.mqtt] Payload is not True or False: stop
2018-11-28 18:08:02 WARNING (MainThread) [homeassistant.components.cover.mqtt] Payload is not True or False: stop
2018-11-28 18:08:04 WARNING (MainThread) [homeassistant.components.cover.mqtt] Payload is not True or False: stop
2018-11-28 18:08:12 WARNING (MainThread) [homeassistant.components.cover.mqtt] Payload is not True or False: stop
2018-11-28 18:08:13 WARNING (MainThread) [homeassistant.components.cover.mqtt] Payload is not True or False: stop
2018-11-28 18:08:15 WARNING (MainThread) [homeassistant.components.cover.mqtt] Payload is not True or False: stop
2018-11-28 18:08:17 WARNING (MainThread) [homeassistant.components.cover.mqtt] Payload is not True or False: stop
2018-11-28 18:08:19 WARNING (MainThread) [homeassistant.components.cover.mqtt] Payload is not True or False: stop
2018-11-28 18:08:21 WARNING (MainThread) [homeassistant.components.cover.mqtt] Payload is not True or False: stop
2018-11-28 18:08:23 WARNING (MainThread) [homeassistant.components.cover.mqtt] Payload is not True or False: stop
2018-11-28 18:08:25 WARNING (MainThread) [homeassistant.components.cover.mqtt] Payload is not True or False: stop
....
What am I doing wrong or how can I suppress these many messages?