Add step functionality to Zigbee curtains using Common Handler. by zhangshen001 · Pull Request #3108 · SmartThingsCommunity/SmartThingsEdgeDrivers

zhangshen001 · 2026-07-09T11:10:56Z

Check all that apply

Type of Change

WWST Certification Request
- If this is your first time contributing code:
  - I have reviewed the README.md file
  - I have reviewed the CODE_OF_CONDUCT.md file
  - I have signed the CLA
- I plan on entering a WWST Certification Request or have entered a request through the WWST Certification console at developer.smartthings.com
Bug fix
New feature
Refactor

Checklist

I have performed a self-review of my code
I have commented my code in hard-to-understand areas
I have verified my changes by testing with a device or have communicated a plan for testing
I am adding new behavior, such as adding a sub-driver, and have added and run new unit tests to cover the new behavior

Description of Change

Summary of Completed Tests

Co-Authored-By: Cline SR (50%)
CGAI & AI Review

CLAassistant · 2026-07-09T11:11:03Z

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
2 out of 3 committers have signed the CLA.

✅ zhangshen001
✅ hcarter-775
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vangoran · 2026-07-10T01:33:17Z

+end
+
+local function shade_level_report_handler(driver, device, value, zb_rx)
+  local latest_target_level = device:get_field(LATEST_TARGET_LEVEL)


Here what we can get is current position of window treatment, right?

The common driver only clears the "LATEST_TARGET_LEVEL" state when the device reports its location and does not handle report-level events. The child driver is responsible for report-level processing and UI events. The report handlers of both drivers will be triggered and will not affect each other.

Since the curtain position status has been updated, the target value is no longer used as a reference for position offset calculation, so LATEST_TARGET_LEVEL needs to be set to null.

vangoran · 2026-07-10T01:35:56Z

+    device:get_latest_state("main", capabilities.windowShadeLevel.ID, capabilities.windowShadeLevel.shadeLevel.NAME) or 0
+
+  -- Calculate UI target_level (user's expected percentage)
+  local ui_target_level= utils.clamp_value(current_level + step, 0, 100)


IS the variable name reasonable?

vangoran · 2026-07-10T02:22:45Z

+  {
+    name = "aqara",
+    mfr = "LUMI",
+    models = { "lumi.curtain", "lumi.curtain.v1", "lumi.curtain.aq2", "lumi.curtain.agl001", "lumi.curtain.acn002" },


Where is 'lumi.curtain.acn002' from?

vangoran · 2026-07-10T02:24:37Z

+    invert_level = true,
+  },
+  {
+    name = "invert-lift-percentage",


If we must need these three parts, please consider to merge them

vangoran · 2026-07-10T02:25:37Z

+-- Brand-specific configuration for window treatment devices
+-- Supports statelessWindowShadeLevelStep capability
+
+local BRAND_CONFIGS = {


Name file and variable using fingerprints

vangoran · 2026-07-10T05:34:55Z

+-- Field keys for tracking target level and timeout timer
+local LATEST_TARGET_LEVEL = "_latest_target_level"
+
+-- Get brand configuration for a device


It's better to use 'fingerprint' into function name and comments

vangoran · 2026-07-10T05:35:43Z

+-- Step shade level handler for statelessWindowShadeLevelStep capability
+local function step_shade_level_handler(driver, device, command)
+  -- Get brand-specific configuration
+  local brand_config = get_brand_config(device)


same as above

vangoran · 2026-07-10T06:47:46Z

+end
+
+local function shade_level_report_handler(driver, device, value, zb_rx)
+  local latest_target_level = device:get_field(LATEST_TARGET_LEVEL)


merge into one sentence and explain why it is required

partner-hub-chenxuelong · 2026-07-10T07:39:55Z

+  local current_level = latest_target_level or
+    device:get_latest_state("main", capabilities.windowShadeLevel.ID, capabilities.windowShadeLevel.shadeLevel.NAME) or 0


For example, if the curtain is initially at level 30 and receives a +10 command, setting the target_level to 40, and then receives a +2 command when the actual curtain position reaches 35, the current_level might still be 30. If the current_level were used as the baseline and the target_level were set to 32, the motor would reverse. Therefore, the target_level is calculated based on the saved LATEST_TARGET_LEVEL and is set to 42.

Hi @partner-hub-chenxuelong ,

Please consider the following situation:

LATEST_TARGET_LEVEL and is set to 42, in the way you described. Then, the user starts turning the knob the other direction before the target level reaches 42.

In the current layout, the user will have to scroll back far to actually have the device start moving in the opposite direction. I believe the device should begin moving the opposite direction immediately.

When the user reverses the knob direction before level 42 is reached, the new target level is immediately recalculated and sent to the device for execution.

I'm not sure that's true, and if it is, it seems like it is only because the LATEST TARGET LEVEL is made nil whenever a Current Window value is received, which seems like it would mess with the LATEST TARGET LEVEL incrementing.

inasail · 2026-07-13T02:34:10Z

+    name = "invert-lift-percentage",
+    mfrs = { "IKEA of Sweden", "Smartwings", "Insta GmbH" },
+    models = {},
+    invert_level = true,


For the Ikea blind, 100% means fully open.
But based on your comment, it seems to be the opposite:

-- invert_level = true: Device reports inverted values (0 = open, 100 = closed)
Would you please double check?

The comment description is inaccurate; we will change it to:

-- invert_level = true:The level values on the device side and the driver side need to be inverted.

kdbang · 2026-07-13T02:44:56Z

+  -- Standard devices (no special handling needed)
+  -- Use WindowCovering.GoToLiftPercentage with 0-100 percentage
+  {
+    name = "rooms-beautiful",


don't you need to add invert_level = true for this model?

Yes, we will add it.

We have fixed this issue, please review.

kdbang · 2026-07-13T03:12:45Z

+      -- Window Covering cluster: handles standard curtain/blind devices 
+      -- (e.g., Vimar: Window_Cov_v1.0/Window_Cov_Module_v1.0, SOMFY: Glydea Ultra Curtain/Sonesse series, 
+      --        IKEA: KADRILJ/FYRTUR, Smartwings: WM25/L-Z, Insta GmbH: NEXENTRO Blinds Actuator, 
+      --        Yookee: D10110, Rooms Beautiful: C001, Screen Innovations: WM25/L-Z)


below two test cases in test_zigbee_window_treatment.lua are failed.

Running test "State transnsition from opening to partially open" (1 of 9) FAILED Running test "State transnsition from opening to closing" (2 of 9) FAILED

NodOn, REXENSE, Shared Revolution devices are using zigbee windowShade_default logic in default_current_lift_percentage_handler.lua

if You add the handler for CurrentPositionLiftPercentage here. the devices do nothing when zigbee message for CurrentPositionLiftPercentage comes
I wonder what your intention is?

We have fixed this issue, please review.

kdbang · 2026-07-13T04:32:31Z

+-- Brand-specific configuration for window treatment devices
+-- Supports statelessWindowShadeLevelStep capability
+
+local FINGERPRINTS = {


we don't need to support Sombra Shades. right?
Can you share the device list to support statelessWindowShadeLevelStep?

Devices that support statelessWindowShadeLevelStep are all those listed in the following file, including Aqara, axis, feibit, hanssem, invert-lift-percentage, rooms-beautiful, screen-innovations, somfiy, vimar, and yoolax.

Hoposmart and VIVIDSTORM devices are not supported. (SmartThingsEdgeDrivers/drivers/SmartThings/zigbee-window-treatment/fingerprints.yml)

If so, why sombra shades aren't included in this FINGERPRINTS?

- id: "Sombra Shades/WM25/L-Z" deviceLabel: Sombra Shades Window Treatment manufacturer: Sombra Shades model: WM25/L-Z deviceProfileName: window-treatment-battery - id: "Sombra Shades/SS25/L-Z" deviceLabel: Sombra Automated Shades and Blinds manufacturer: Sombra Shades model: SS25/L-Z deviceProfileName: window-treatment-battery - id: "Sombra Shades/SOMBRA/Z-M" deviceLabel: Sombra Automated Shades manufacturer: Sombra Shades model: SOMBRA/Z-M deviceProfileName: window-treatment-powerSource

Because the Sombra driver implementation wasn't available in SmartThingsEdgeDrivers/drivers/SmartThings/zigbee-window-treatment/src when we were trying to implement stateless_handler, we didn't add it.We will add it.

kdbang · 2026-07-13T04:35:18Z

+  {
+    name = "aqara",
+    mfr = "LUMI",
+    models = { "lumi.curtain", "lumi.curtain.v1", "lumi.curtain.aq2", "lumi.curtain.agl001" },


lumi.curtain.agl001 is using window-treatment-aqara-curtain-driver-e1 profile.
but profile doesn't have statelessWindowShadeLevelStep
including lumi.curtain.agl001 model in here. right?

Because the curtain-driver-e1 driver does not implement windowShadeLevel, we assume it also does not support statelessWindowShadeLevelStep, and therefore we are removing lumi.curtain.agl001 from the support list.

We have fixed this issue, please review.

kdbang · 2026-07-13T04:41:08Z

+local capabilities = require "st.capabilities"
+
+return function(opts, driver, device)
+  local can_handle = device:supports_capability(capabilities.statelessWindowShadeLevelStep)


can you check compatibility with hubcore with not added statelessWindowShadeLevelStep?
I guess capabilities.statelessWindowShadeLevelStep statement would be error.

We conducted tests. No impact.

kdbang · 2026-07-13T05:09:10Z

+
+  for _, config in ipairs(FINGERPRINTS) do
+    -- Check if this config matches by model only (match_by_model = true)
+    if config.match_by_model then


Why do you check only two model name via match_by_model?
TS0601 and WM25/L-Z.
As far as I know TS0601 is used for model name of other tuya devices (not only window shade). it is not unique name.
And there are the two devices in fingerprints.yml. same model name, different device.

- id: "Smartwings/WM25/L-Z" deviceLabel: Smartwings Window Treatment manufacturer: Smartwings model: WM25/L-Z deviceProfileName: window-treatment-battery - id: "ScreenInnovations/WM25/L-Z" deviceLabel: Screen Innovations Window Treatment manufacturer: Screen Innovations model: WM25/L-Z deviceProfileName: window-treatment-powerSource

Perhaps, there might be some issues.
I wonder why you don't use model name and manufacturer to check those devices.

We have fixed this issue, please review.

kdbang · 2026-07-13T05:36:16Z

  - id: "Smartwings/WM25/L-Z"
    deviceLabel: Smartwings Window Treatment
    manufacturer: Smartwings
    model: WM25/L-Z
    deviceProfileName: window-treatment-battery

it seems that above devices are using below two sub-drivers.

invert-lift-percentage

local function invert_lift_percentage_can_handle(opts, driver, device, ...)
  if device:get_manufacturer() == "IKEA of Sweden" or
    device:get_manufacturer() == "Smartwings" or
    device:get_manufacturer() == "Insta GmbH"
  then
      return true, require("invert-lift-percentage")
  end
  return false
end

screen-innovations

local function screen_innovations_can_handle(opts, driver, device, ...)
  if device:get_model() == "WM25/L-Z" then
    return true, require("screen-innovations")
  end
  return false
end

can you check this? it is possible or bug.

partner-hub-chenxuelong · 2026-07-13T11:51:07Z

+  {
+    name = "sombra-shades",
+    mfr = "Sombra Shades",
+    models = { "SOMBRA/Z-M" },


Because the Sombra driver's fingerprints only contain SOMBRA/Z-M, we only added this one.

hcarter-775 · 2026-07-14T00:07:32Z

I think the fingerprints.lua structure you have here has some issues as far as maintainability and ensuring that all devices are properly handled.

I have created a branch here that attempts to solve some of the issues the fingerprints file tries to solve, without the need for as much manual intervention.

One thing I did was to change the stateless step handler to look more like this:

-- Step shade level handler for statelessWindowShadeLevelStep capability
utils.step_shade_level_handler = function(invert_shade_level)
  return function(driver, device, command)
    local step = command.args.stepSize or 0
    if step == 0 then return
    elseif invert_shade_level then step = -step end -- invert step's direction if invert_shade_level is true

    -- Step from the latest target level if it exists, or from the current shade level
    local latest_target_level = device:get_field(LATEST_TARGET_LEVEL) or
      device:get_latest_state("main", capabilities.windowShadeLevel.ID, capabilities.windowShadeLevel.shadeLevel.NAME, 0)
    local new_target_level = st_utils.clamp_value(latest_target_level + step, 0, 100)

    -- Cancel any previous timer and set a 3 second timeout timer to ensure target_level is cleared
    -- This is to prevent the stateless step from accumulating indefinitely, while ensuring that a single
    -- "scroll" action can accumulate multiple steps within a short time frame
    if device:get_field(TARGET_LEVEL_TIME_OUT) then
      device.thread:cancel_timer(device:get_field(TARGET_LEVEL_TIME_OUT))
    end
    local timer = device.thread:call_with_delay(TARGET_LEVEL_TIME_OUT_SECONDS, function(d)
      device:set_field(LATEST_TARGET_LEVEL, nil)
    end)
    device:set_field(TARGET_LEVEL_TIME_OUT, timer)
    device:set_field(LATEST_TARGET_LEVEL, new_target_level)

    driver:inject_capability_command(device, {
      capability = capabilities.windowShadeLevel.ID,
      component = command.component,
      command = capabilities.windowShadeLevel.commands.setShadeLevel.NAME,
      named_args = { shadeLevel = new_target_level }
    })
  end
end

which uses the inject_capability_command helper. This will allow us to explicitly use each subdriver's logic without having to re-write it all from scratch, which is error-prone and non maintainable.

The primary issue with this injection method, with the way the subdrivers are currently laid out, is that the "inversion" does not work naturally for both regular and inverted rotation devices. To get around this, I moved all of the inverted subdrivers under the general inverted subdriver, like this. This then allows all inverted devices to simply use this handler (with inverted set to true).

Also, I do not see the benefit of this handler you've added:

local function shade_level_report_handler(driver, device, value, zb_rx)
...
end

In its current form, it seems to only set the latest target to nil (which is undesirable since we may receive this value before the target is reached, or the user stops scrolling.

As can be seen in my above stateless handler, I rather think that we should keep an internal timer for the target state, and set that to nil after a short period (aka how long we expect the user to be attempting one continuous scroll). This is effectively equivalent.

Please check out the changes in my branch, which I have committed directly on top of this one, for more detail on how I imagine this may look. Thanks!

github-actions · 2026-07-14T01:03:48Z

Duplicate profile check: Passed - no duplicate profiles detected.

github-actions · 2026-07-14T01:04:20Z

Invitation URL:
https://bestow-regional.api.smartthings.com/invite/oxl4aEyxODj1

github-actions · 2026-07-14T01:05:57Z

Test Results

73 files 538 suites 0s ⏱️
3 186 tests 3 177 ✅ 0 💤 0 ❌ 9 🔥
5 187 runs 5 178 ✅ 0 💤 0 ❌ 9 🔥

For more details on these errors, see this check.

Results for commit 4818175.

github-actions · 2026-07-14T01:05:59Z

File	Coverage
All files	`93%`	✅
/home/runner/work/SmartThingsEdgeDrivers/SmartThingsEdgeDrivers/drivers/SmartThings/zigbee-window-treatment/src/aqara/version/can_handle.lua	`83%`	❌
/home/runner/work/SmartThingsEdgeDrivers/SmartThingsEdgeDrivers/drivers/SmartThings/zigbee-window-treatment/src/VIVIDSTORM/init.lua	`93%`	✅
/home/runner/work/SmartThingsEdgeDrivers/SmartThingsEdgeDrivers/drivers/SmartThings/zigbee-window-treatment/src/aqara/aqara_utils.lua	`93%`	✅
/home/runner/work/SmartThingsEdgeDrivers/SmartThingsEdgeDrivers/drivers/SmartThings/zigbee-window-treatment/src/aqara/init.lua	`90%`	✅
/home/runner/work/SmartThingsEdgeDrivers/SmartThingsEdgeDrivers/drivers/SmartThings/zigbee-window-treatment/src/hanssem/init.lua	`91%`	✅
/home/runner/work/SmartThingsEdgeDrivers/SmartThingsEdgeDrivers/drivers/SmartThings/zigbee-window-treatment/src/yoolax/init.lua	`97%`	✅
/home/runner/work/SmartThingsEdgeDrivers/SmartThingsEdgeDrivers/drivers/SmartThings/zigbee-window-treatment/src/axis/axis_version/init.lua	`97%`	✅
/home/runner/work/SmartThingsEdgeDrivers/SmartThingsEdgeDrivers/drivers/SmartThings/zigbee-window-treatment/src/window_shade_utils.lua	`88%`	❌
/home/runner/work/SmartThingsEdgeDrivers/SmartThingsEdgeDrivers/drivers/SmartThings/zigbee-window-treatment/src/lazy_load_subdriver.lua	`57%`	❌
/home/runner/work/SmartThingsEdgeDrivers/SmartThingsEdgeDrivers/drivers/SmartThings/zigbee-window-treatment/src/stateless_handler/can_handle.lua	`83%`	❌
/home/runner/work/SmartThingsEdgeDrivers/SmartThingsEdgeDrivers/drivers/SmartThings/zigbee-window-treatment/src/stateless_handler/init.lua	`20%`	❌
/home/runner/work/SmartThingsEdgeDrivers/SmartThingsEdgeDrivers/drivers/SmartThings/zigbee-window-treatment/src/sombra/init.lua	`95%`	✅
/home/runner/work/SmartThingsEdgeDrivers/SmartThingsEdgeDrivers/drivers/SmartThings/zigbee-window-treatment/src/aqara/curtain-driver-e1/init.lua	`92%`	✅

Minimum allowed coverage is 90%

Generated by 🐒 cobertura-action against 4818175

…dow-shade-step Handle Zigbee Window Stateless Step Commands

hongye-samsung · 2026-07-14T13:07:35Z

I think the fingerprints.lua structure you have here has some issues as far as maintainability and ensuring that all devices are properly handled.

I have created a branch here that attempts to solve some of the issues the fingerprints file tries to solve, without the need for as much manual intervention.

One thing I did was to change the stateless step handler to look more like this:
-- Step shade level handler for statelessWindowShadeLevelStep capability
utils.step_shade_level_handler = function(invert_shade_level)
  return function(driver, device, command)
    local step = command.args.stepSize or 0
    if step == 0 then return
    elseif invert_shade_level then step = -step end -- invert step's direction if invert_shade_level is true

    -- Step from the latest target level if it exists, or from the current shade level
    local latest_target_level = device:get_field(LATEST_TARGET_LEVEL) or
      device:get_latest_state("main", capabilities.windowShadeLevel.ID, capabilities.windowShadeLevel.shadeLevel.NAME, 0)
    local new_target_level = st_utils.clamp_value(latest_target_level + step, 0, 100)

    -- Cancel any previous timer and set a 3 second timeout timer to ensure target_level is cleared
    -- This is to prevent the stateless step from accumulating indefinitely, while ensuring that a single
    -- "scroll" action can accumulate multiple steps within a short time frame
    if device:get_field(TARGET_LEVEL_TIME_OUT) then
      device.thread:cancel_timer(device:get_field(TARGET_LEVEL_TIME_OUT))
    end
    local timer = device.thread:call_with_delay(TARGET_LEVEL_TIME_OUT_SECONDS, function(d)
      device:set_field(LATEST_TARGET_LEVEL, nil)
    end)
    device:set_field(TARGET_LEVEL_TIME_OUT, timer)
    device:set_field(LATEST_TARGET_LEVEL, new_target_level)

    driver:inject_capability_command(device, {
      capability = capabilities.windowShadeLevel.ID,
      component = command.component,
      command = capabilities.windowShadeLevel.commands.setShadeLevel.NAME,
      named_args = { shadeLevel = new_target_level }
    })
  end
end
which uses the inject_capability_command helper. This will allow us to explicitly use each subdriver's logic without having to re-write it all from scratch, which is error-prone and non maintainable.

The primary issue with this injection method, with the way the subdrivers are currently laid out, is that the "inversion" does not work naturally for both regular and inverted rotation devices. To get around this, I moved all of the inverted subdrivers under the general inverted subdriver, like this. This then allows all inverted devices to simply use this handler (with inverted set to true).

Also, I do not see the benefit of this handler you've added:
local function shade_level_report_handler(driver, device, value, zb_rx)
...
end
In its current form, it seems to only set the latest target to nil (which is undesirable since we may receive this value before the target is reached, or the user stops scrolling.

As can be seen in my above stateless handler, I rather think that we should keep an internal timer for the target state, and set that to nil after a short period (aka how long we expect the user to be attempting one continuous scroll). This is effectively equivalent.

Please check out the changes in my branch, which I have committed directly on top of this one, for more detail on how I imagine this may look. Thanks!

Hi @hcarter-775 Thank you very much for your detailed reivewing, we have updated the code & TCs according to your comments, please reivew,
Besides, we have some questions, could you please help us to check? Many thanks!
04af865

vangoran reviewed Jul 10, 2026

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Comment thread drivers/SmartThings/zigbee-window-treatment/capabilities/statelessWindowShadeLevelStep.yaml Outdated

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zhangshen001 marked this pull request as ready for review July 10, 2026 08:29

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Add step functionality to Zigbee curtains using Common Handler.

4818175

partner-hub-chenxuelong reviewed Jul 13, 2026

View reviewed changes

Handle Zigbee Window Stateless Step Commands

04af865

zhangshen001 and others added 2 commits July 14, 2026 20:49

Merge pull request #3 from SmartThingsCommunity/support/stateless-win…

8fdaf4d

…dow-shade-step Handle Zigbee Window Stateless Step Commands

Update TC for Handle Zigbee Window Stateless Step Commands

77a449f

		local current_level = latest_target_level or
		device:get_latest_state("main", capabilities.windowShadeLevel.ID, capabilities.windowShadeLevel.shadeLevel.NAME) or 0

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Type of Change

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Description of Change

Summary of Completed Tests

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