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It is possible to use an external temperature sensor for TRV thermostat (Model TS0601).

  1. Set an object name in the SB rule column to the temperature state of the external temperature sensor. For example: room1.temperature

  2. Set the onChange script for that object in init.lua. For example:

obj.onChange('room1.temperature', 'room1_trv_calibration.lua')
obj.onChange('room1.temperature', 'room1_trv_calibration.lua')
  1. Add the script room1_trv_calibration.lua:
trv = "0x84FD27FFFE2Dxxxx"
ext_temperature = obj.get("room1.temperature")
ext_temperature = math.floor(ext_temperature * 10 + 0.5) / 10
local_temperature_calibration = zigbee.value(trv, "local_temperature_calibration")
local_temperature_calibration = math.floor(local_temperature_calibration * 10 + 0.5) / 10
--[ Workaround: set local_temperature_calibration to update local_temperature ]
zigbee.set(trv, "local_temperature_calibration", local_temperature_calibration)
local_temperature = zigbee.value(trv, "local_temperature")
local_temperature = math.floor(local_temperature * 10 + 0.5) / 10
if ext_temperature ~= local_temperature then
  local_temperature_calibration = local_temperature_calibration + ext_temperature - local_temperature
  zigbee.set(trv, "local_temperature_calibration", local_temperature_calibration)
end
trv = "0x84FD27FFFE2Dxxxx"
ext_temperature = obj.get("room1.temperature")
ext_temperature = math.floor(ext_temperature * 10 + 0.5) / 10
local_temperature_calibration = zigbee.value(trv, "local_temperature_calibration")
local_temperature_calibration = math.floor(local_temperature_calibration * 10 + 0.5) / 10
--[ Workaround: set local_temperature_calibration to update local_temperature ]
zigbee.set(trv, "local_temperature_calibration", local_temperature_calibration)
local_temperature = zigbee.value(trv, "local_temperature")
local_temperature = math.floor(local_temperature * 10 + 0.5) / 10
if ext_temperature ~= local_temperature then
  local_temperature_calibration = local_temperature_calibration + ext_temperature - local_temperature
  zigbee.set(trv, "local_temperature_calibration", local_temperature_calibration)
end

Note update trv = "0x84FD27FFFE2Dxxxx" with ieeeAddr of your thermostat. Note update ext_temperature = obj.get("room1.temperature") with your object name.

  1. If you are using this thermostat note it does not report the current temperature (local_temperature) itself for now (30.10.2021). I recommend to add the following code to the minute timer OneMinTimer.lua:
if Event.Time.min % 15 == 0 then
  dofile("/int/room1_trv_calibration.lua")
end
if Event.Time.min % 15 == 0 then
  dofile("/int/room1_trv_calibration.lua")
end

If your thermostat reports the current temperature (local_temperature), then do not add the timer and remove the following 2 lines from room1_trv_calibration.lua:

--[ Workaround: set local_temperature_calibration to update local_temperature ]
zigbee.set(trv, "local_temperature_calibration", local_temperature_calibration)
--[ Workaround: set local_temperature_calibration to update local_temperature ]
zigbee.set(trv, "local_temperature_calibration", local_temperature_calibration)