[Nest] Bug: unable to set temperature to .5 °C values.

[oaksboard]

Setting temperature to say 19.5°C results in temperature set to 19.0°C. The half degree Celsius is always stripped away.

This is my item (as of binding example):
Number living_room_target_temperature_c { nest="=[thermostats(Living Room).target_temperature_c]" }

Even if sending the update command from console, after a short while it re-reads the set value as 19.0°C:
osgi> openhab update living_room_target_temperature_c 19.5 Update has been sent successfully. osgi> openhab status living_room_target_temperature_c 19.5 osgi> openhab status living_room_target_temperature_c 19.0

NB: if temperature is set from Nest App it is reported correctly everywhere, so the problem seems to be with sending the value to Nest, not handling it.

(openHAB 1.8.0 on debian RPi B+, org.openhab.binding.nest-1.8.0.jar)

[watou]

Do you have the Thermostat read/write permission set in your product? I am not presently able to test setpoint changes against a Nest thermostat, but if you could provide TRACE logging from the binding, it would help identify the issue. The binding sends whatever BigDecimal value you provide, so I would like to see the JSON.

[oaksboard]

Hello watou, yes, i have read/write permission to the thermostat, because if I set the temperature to e.g. 20°C it works correctly.

Here the TRACE log of the command "set temperature to 19.5°C":
2016-02-01 11:19:49.759 [TRACE] [.o.b.nest.internal.NestBinding] - internalReceiveCommand(item='living_room_target_temperature_c', command='19.5')
2016-02-01 11:19:49.766 [DEBUG] [.o.b.nest.internal.NestBinding] - About to set property 'thermostats(Living Room).target_temperature_c' to '19.5'
2016-02-01 11:19:49.781 [TRACE] [.o.b.nest.internal.NestBinding] - Data model for update: DataModel[devices=DataModel.Devices[thermostats={REDACTED=Thermostat[device_id=<null>,name=<null>,locale=<null>,software_version=<null>,structure_id=<null>,name=<null>,name_long=<null>,last_connection=<null>,is_online=<null>,can_cool=<null>,can_heat=<null>,is_using_emergency_heat=<null>,has_fan=<null>,fan_timer_active=<null>,fan_timer_timeout=<null>,has_leaf=<null>,temperature_scale=<null>,target_temperature_f=<null>,target_temperature_c=19,target_temperature_high_f=<null>,target_temperature_high_c=<null>,target_temperature_low_f=<null>,target_temperature_low_c=<null>,away_temperature_high_f=<null>,away_temperature_high_c=<null>,away_temperature_low_f=<null>,away_temperature_low_c=<null>,hvac_mode=<null>,ambient_temperature_f=<null>,ambient_temperature_c=<null>,humidity=<null>,hvac_state=<null>]},smoke_co_alarms=<null>,cameras=<null>],structures=<null>]
2016-02-01 11:19:49.821 [TRACE] [b.n.i.messages.AbstractRequest] - About to execute 'https://developer-api.nest.com/?auth=REDACTED'
2016-02-01 11:19:50.449 [TRACE] [b.n.i.messages.AbstractRequest] - About to execute 'https://firebase-apiserver11-tah01-iad01.dapi.production.nest.com:9553/?auth=REDACTED'
2016-02-01 11:19:51.394 [TRACE] [b.n.i.messages.AbstractRequest] - {"devices":{"thermostats":{"REDACTED":{"target_temperature_c":19}}}}

And here a sequence (shortened for the post) where you can see, that setting temperature to 20.0°C works:
We received this event (item='living_room_target_temperature_c', state='19.0') from Nest, so we don't send it back again -> ignore!
About to set property 'thermostats(Living Room).target_temperature_c' to '19.5'
We received this event (item='living_room_target_temperature_c', state='19.0') from Nest, so we don't send it back again -> ignore!
About to set property 'thermostats(Living Room).target_temperature_c' to '19.5'
About to set property 'thermostats(Living Room).target_temperature_c' to '20.0'
We received this event (item='living_room_target_temperature_c', state='20.0') from Nest, so we don't send it back again -> ignore!
About to set property 'thermostats(Living Room).target_temperature_c' to '19.5'
We received this event (item='living_room_target_temperature_c', state='19.0') from Nest, so we don't send it back again -> ignore!

[watou]

Interesting; thanks!

[watou]

Would you mind giving this JAR a thorough workout to see if it fixes the problem and doesn't create new ones?

[oaksboard]

OK, I will.
One question: as I installed openHAB by "apt-get" on debian, should I remove the bundle with "apt-get remove" first or simply rename the 1.8.0 jar file before copying the 1.9 snapshot over?

[watou]

as I installed openHAB by "apt-get" on debian, should I remove the bundle with "apt-get remove" first or simply rename the 1.8.0 jar file before copying the 1.9 snapshot over?

Assuming you're on openHAB 1.x, I would just move the existing binding JAR out of the addons directory and move the test JAR into its place, without any file renaming.

[oaksboard]

Yes, I am on openHAB 1.8.0.
With the test JAR in place everything works as expected! I can now set 19.5°C and it will show up on the thermostat.
No other issues detected, so far.
Thank you for your quick replies!