Why different types of Triggers within openLuup & ALTUI

[akbooer]

@a-lurker said in Migrating Zwave & ZigBee stuff to MQTT - guidance needed.:

time will tell how reliable the system as whole would be

Is there some symptomatic problem I should know about?

@a-lurker said in Migrating Zwave & ZigBee stuff to MQTT - guidance needed.:

"D_GenericZigbeeDevice.xml", of which the actual file doesn't seem to exist

It does, in openLuup's virtual world. If you try http://openLuupIP:3480/D_GenericZigbeeDevice.xml you should see this in the browser:

<?xml version="1.0"?>
<root xmlns="urn:schemas-upnp-org:device-1-0">
 <specVersion>
  <major>1</major>
  <minor>0</minor>
  <minimus>auto-generated</minimus></specVersion>
 <device>
  <staticJson>D_GenericZigbeeDevice.json</staticJson>
  <deviceType>GenericZigbeeDevice</deviceType></device></root>

I'll fix the error and review the infer_device_type() function. It was always going to evolve anyway as different device needs arise.

I have tended to represent any sort of multi-action switch as a scene controller. There will always be difficult cases (sometimes resolved by using vendor/manufacturer) but I have shied away from an extensive configuration database. Plausible, I suppose, to pull this from the web...?

I rely on Philips Hue for the few Zigbee devices that I have, so probably won't get to road test this for myself. You're going to want to do the whole thing again for Zwave JS ?

[a-lurker]

@akbooer said in Migrating Zwave & ZigBee stuff to MQTT - guidance needed.:

Is there some symptomatic problem I should know about?

I don't think so but who wants to set up heaps of devices in a new set up when everything has been going well for years with just openLuup and an old Vera war horse!

Plausible, I suppose, to pull this from the web...?

Don't need to get to complicated too soon, as you just about have it all covered but I'm still thinking of one of these Hue Smart plugs. It's just a switch, as opposed to a scene controller.

I rely on Philips Hue for the few Zigbee devices that I have

Arrhh you know you want to ditch that hub.

You're going to want to do the whole thing again for Zwave JS ?

Maybe after a cup of tea and good lie down. And yourself?

[akbooer]

@a-lurker said in Migrating Zwave & ZigBee stuff to MQTT - guidance needed.:

Maybe after a cup of tea and good lie down. And yourself?

Definitely the tea. Possibly the lie down.

You'll have to educate me about the protocol, yet again, but it should almost be a dead-ringer for the Zigbee ??

[akbooer]

Release development v22.12.6 separating switch and controller devices, and fixing nil function pointer.

[a-lurker]

@akbooer said in Migrating Zwave & ZigBee stuff to MQTT - guidance needed.:

Release development v22.12.6 separating switch and controller devices, and fixing nil function pointer

Thanks for that - looks OK now.

Have now got all my Hue stuff running with no Hue hub - that's good. A few complications here and there.

Main complication:
Conditions:
z2m is running and openLuup is running.
Then pair new device: in this case this Philips light bulb with z2m.
z2m logs this to the terminal. I've prettied the json section so you can read it:

Zigbee2MQTT:info  2022-12-10 10:40:28: Device '0x001788010363fcbf' joined
Zigbee2MQTT:info  2022-12-10 10:40:28: MQTT publish: topic 'zigbee2mqtt/bridge/event', payload '{"data":{"friendly_name":"0x001788010363fcbf","ieee_address":"0x001788010363fcbf"},"type":"device_joined"}'
Zigbee2MQTT:info  2022-12-10 10:40:28: Starting interview of '0x001788010363fcbf'
Zigbee2MQTT:info  2022-12-10 10:40:28: MQTT publish: topic 'zigbee2mqtt/bridge/event', payload '{"data":{"friendly_name":"0x001788010363fcbf","ieee_address":"0x001788010363fcbf","status":"started"},"type":"device_interview"}'
Zigbee2MQTT:info  2022-12-10 10:40:29: Successfully interviewed '0x001788010363fcbf', device has successfully been paired
Zigbee2MQTT:info  2022-12-10 10:40:29: Device '0x001788010363fcbf' is supported, identified as: Philips Hue White A60 Single bulb E27/B22 (8718696449691)
Zigbee2MQTT:info  2022-12-10 10:40:29: MQTT publish: topic 'zigbee2mqtt/bridge/event', payload '
{
	"data": {
		"definition": {
			"description": "Hue White A60 Single bulb E27/B22",
			"exposes": [{
				"features": [{
					"access": 7,
					"description": "On/off state of this light",
					"name": "state",
					"property": "state",
					"type": "binary",
					"value_off": "OFF",
					"value_on": "ON",
					"value_toggle": "TOGGLE"
				}, {
					"access": 7,
					"description": "Brightness of this light",
					"name": "brightness",
					"property": "brightness",
					"type": "numeric",
					"value_max": 254,
					"value_min": 0
				}],
				"type": "light"
			}, {
				"access": 2,
				"description": "Triggers an effect on the light (e.g. make light blink for a few seconds)",
				"name": "effect",
				"property": "effect",
				"type": "enum",
				"values": ["blink", "breathe", "okay", "channel_change", "finish_effect", "stop_effect"]
			}, {
				"access": 1,
				"description": "Link quality (signal strength)",
				"name": "linkquality",
				"property": "linkquality",
				"type": "numeric",
				"unit": "lqi",
				"value_max": 255,
				"value_min": 0
			}],
			"model": "8718696449691",
			"options": [{
				"access": 2,
				"description": "Controls the transition time (in seconds) of on/off, brightness, color temperature (if applicable) and color (if applicable) changes. Defaults to `0` (no transition).",
				"name": "transition",
				"property": "transition",
				"type": "numeric",
				"value_min": 0
			}],
			"supports_ota": true,
			"vendor": "Philips"
		},
		"friendly_name": "0x001788010363fcbf",
		"ieee_address": "0x001788010363fcbf",
		"status": "successful",
		"supported": true
	},
	"type": "device_interview"
}
'
Zigbee2MQTT:info  2022-12-10 10:40:29: Configuring '0x001788010363fcbf'
Zigbee2MQTT:info  2022-12-10 10:40:29: Successfully configured '0x001788010363fcbf'

Looks like openLuup then responds to the topic zigbee2mqtt/bridge/event ?? and creates a Generic device. The openLuup log doesn't make it clear what topic it's responding to when it creates a device but you can see in the log that it has found a new device:

2022-12-10 10:40:28.568   openLuup.mqtt:: PUBLISH tcp{client}: 0x3a7b670
2022-12-10 10:40:28.571   luup.zigbee2mqtt:0: Topic ignored : zigbee2mqtt : / : bridge/logging
2022-12-10 10:40:28.574   openLuup.mqtt:: PUBLISH tcp{client}: 0x3a7b670
2022-12-10 10:40:28.591   luup.zigbee2mqtt:0: New Zigbee detected: 0x001788010363fcbf
2022-12-10 10:40:28.594   luup.create_device:: [20010] D_GenericZigbeeDevice.xml /  / D_GenericZigbeeDevice.json   (GenericZigbeeDevice)
2022-12-10 10:40:28.602   openLuup.mqtt:: PUBLISH tcp{client}: 0x3a7b670
2022-12-10 10:40:28.603   luup.zigbee2mqtt:0: Topic ignored : zigbee2mqtt : / : bridge/logging
2022-12-10 10:40:28.605   openLuup.mqtt:: PUBLISH tcp{client}: 0x3a7b670
2022-12-10 10:40:28.605   luup.zigbee2mqtt:0: Topic ignored : zigbee2mqtt : / : bridge/event
2022-12-10 10:40:28.607   openLuup.mqtt:: PUBLISH tcp{client}: 0x3a7b670
2022-12-10 10:40:28.607   luup.zigbee2mqtt:0: Topic ignored : zigbee2mqtt : / : bridge/logging
2022-12-10 10:40:28.609   openLuup.mqtt:: PUBLISH tcp{client}: 0x3a7b670
2022-12-10 10:40:28.626   openLuup.mqtt:: PUBLISH tcp{client}: 0x3a7b670
2022-12-10 10:40:28.626   luup.zigbee2mqtt:0: Topic ignored : zigbee2mqtt : / : bridge/logging
2022-12-10 10:40:28.628   openLuup.mqtt:: PUBLISH tcp{client}: 0x3a7b670
2022-12-10 10:40:28.628   luup.zigbee2mqtt:0: Topic ignored : zigbee2mqtt : / : bridge/event
2022-12-10 10:40:28.754   openLuup.server:: request completed (11333 bytes, 1 chunks, 2261 ms) tcp{client}: 0x43d0070
2022-12-10 10:40:28.766   openLuup.server:: GET /data_request?id=user_data&output_format=json&DataVersion=564556066&_=1670559272961 HTTP/1.1 tcp{client}: 0x43d0070
2022-12-10 10:40:29.987   openLuup.server:: request completed (1723523 bytes, 108 chunks, 1220 ms) tcp{client}: 0x43d0070
2022-12-10 10:40:30.017   openLuup.mqtt:: PUBLISH tcp{client}: 0x3a7b670
2022-12-10 10:40:30.017   luup.zigbee2mqtt:0: Topic ignored : zigbee2mqtt : / : bridge/logging
2022-12-10 10:40:30.018   openLuup.mqtt:: PUBLISH tcp{client}: 0x3a7b670
2022-12-10 10:40:30.018   luup.zigbee2mqtt:0: Topic ignored : zigbee2mqtt : / : bridge/logging
2022-12-10 10:40:30.020   openLuup.mqtt:: PUBLISH tcp{client}: 0x3a7b670
2022-12-10 10:40:30.032   openLuup.mqtt:: PUBLISH tcp{client}: 0x3a7b670
2022-12-10 10:40:30.033   luup.zigbee2mqtt:0: Topic ignored : zigbee2mqtt : / : bridge/logging
2022-12-10 10:40:30.034   openLuup.mqtt:: PUBLISH tcp{client}: 0x3a7b670
2022-12-10 10:40:30.035   luup.zigbee2mqtt:0: Topic ignored : zigbee2mqtt : / : bridge/event
2022-12-10 10:40:30.036   openLuup.mqtt:: PUBLISH tcp{client}: 0x3a7b670
2022-12-10 10:40:30.036   luup.zigbee2mqtt:0: Topic ignored : zigbee2mqtt : / : bridge/logging
2022-12-10 10:40:30.037   openLuup.mqtt:: PUBLISH tcp{client}: 0x3a7b670
2022-12-10 10:40:30.037   luup.zigbee2mqtt:0: Topic ignored : zigbee2mqtt : / : bridge/logging
2022-12-10 10:40:30.039   openLuup.mqtt:: PUBLISH tcp{client}: 0x3a7b670
2022-12-10 10:40:30.048   openLuup.mqtt:: PUBLISH tcp{client}: 0x3a7b670
2022-12-10 10:40:30.052   luup.zigbee2mqtt:0: Topic ignored : zigbee2mqtt : / : bridge/info

So it looks as the event returns the same data as "zigbee2mqtt/bridge/devices" does, as each new device is paired but it's parent json is a little different. The device definition is below "data" in the json:

"data":

With type set as follows:

type="device_interview",

and this must indicate success:

data.status ="successful"

Hope that's clear - bit hard to explain.

Suffice to say I added a pile of stuff and ended up with a whole pile of generic devices, which I had to remove one by one with a openLuup restart for each. Got a bit ambitious!

However; it looks like the ability to handle the addition of new devices on the fly without having to restart thez2m server each time to get the device definitions, would certainly be possible and a welcome addition.

Looks like you just look for the event topic with {"type":"device_interview" and {"data": status":"successful".

The json contains definition.expose.type = light so the function infer_device_type() should still do its work OK as it currently does.

I can't test any new code on this as I have now added all my devices. Although I could unpair just a light bulb and repair it and see what happens.

[a-lurker]

A slight in convenience:

Conditions:
Having just added a scene controller to z2m and restarted the z2m server and openLuup has dutifully added it in and here it is:

Great; so first thing to do next, is to link the scene controller to a scene: So create a new scene, dial up the scene controller and put a watch on to create a trigger:

LastSceneTime	(new~=old)

Problem is LastSceneTime is nowhere to be found - bit disconcerting at this point. In order to proceed, you have to push a button on the scene controller to get the variable to be created. Suggest the variable is created when the scene controller is first added to openLuup and set its time to Unix year zero.

[a-lurker]

A slight in convenience: no way to set color on the light bulbs. X,Y color space seems better than RGB as it allows you to specify white color temperature.

[a-lurker]

This vibration detection device and other similar devices should be "inferred" as a motion sensor. They expose "contact".

Perhaps infer_device_type() could use some look up table or look at json string that could perhaps be later saved to a file that the user could fiddle with? eg some vague pesudo code. Whatever you figure would work.

local deviceType = nil
if (lookup.exposes.contact) then
    deviceType = lookup.exposes.contact
end

[akbooer]

@a-lurker said in Migrating Zwave & ZigBee stuff to MQTT - guidance needed.:

Looks like openLuup then responds to the topic zigbee2mqtt/bridge/event ?? and creates a Generic device.

Can't see how that would happen. The bridge code is clear that anything other than bridge/devices is ignored:

local function handle_bridge_topics (topic, message)
  local subtopic = topic: match "^bridge/(.+)"
  if subtopic: match "^devices" then
    create_devices (message)
  else
    ignore_topic (topic)
  end
end

and it should write Topic ignored... in the log. If it creates a device, it must be receiving the actual /devices topics. I take it that your "info" log messages are your own additions to the code. I could certainly make it respond to a /event topic. The Shelly and Tasmota bridges already create new devices on the fly, because they send their own configurations when they connect to MQTT.

[akbooer]

@a-lurker said in Migrating Zwave & ZigBee stuff to MQTT - guidance needed.:

Problem is LastSceneTime is nowhere to be found - bit disconcerting at this point. In order to proceed, you have to push a button on the scene controller to get the variable to be created.

Yes, that's true. The root cause is actually that the service file for a scene controller S_SceneController1.xml does not contain a definition of that variable, or a default vaule for it. I could force this at device creation, but you have found a work-around alreay.

[akbooer]

@a-lurker said in Migrating Zwave & ZigBee stuff to MQTT - guidance needed.:

A slight in convenience: no way to set color on the light bulbs. X,Y color space seems better than RGB as it allows you to specify white color temperature.

Some investigation required here. The existing Color service definition defines three actions of interest:

1. setColor
2. setColorRGB
3. setColorTemperature

It's not clear from the service file definition what the possible value/syntax is for any of these commands, so that would mean delving into the UPnP documentation, which, previously, I've found to be an absolute nightmare (as are most international standard definitions.) Perhaps csomeone here can aleady tell us the answer?

[akbooer]

@a-lurker said in Migrating Zwave & ZigBee stuff to MQTT - guidance needed.:

This vibration detection device and other similar devices should be "inferred" as a motion sensor. They expose "contact".

Do you have the bridge/devices JSON for that device?

[akbooer]

@akbooer said in Migrating Zwave & ZigBee stuff to MQTT - guidance needed.:

The root cause is actually that the service file for a scene controller S_SceneController1.xml does not contain a definition of that variable, or a default vaule for it. I could force this at device creation

...and I have just done so in development v22.12.11.

[a-lurker]

@akbooer said in Migrating Zwave & ZigBee stuff to MQTT - guidance needed.:

Do you have the bridge/devices JSON for that device?

No but I would see it as no different to checking "occupancy" in the motion sensor device.

[a-lurker]

@akbooer said in Migrating Zwave & ZigBee stuff to MQTT - guidance needed.:

I take it that your "info" log messages are your own additions to the code.

The two logs are directly as they were spat out, except for uncollapsing of the json as mentioned above. I made no changes.

Yes - this is very odd - I can't see how the code would respond to anything else but the bridges/devices topic either. But certainly it appears to have done same; but unsuccessfully as all devices ended up being considered Generic. I may have to try repairing a bulb with more debug code.

Moving forward - responding to an /event topic would be good.

[akbooer]

These messages:

Zigbee2MQTT:info  2022-12-10 10:40:28: MQTT publish: topic 'zigbee2mqtt/bridge/event', payload '{"data":{"friendly_name":"0x001788010363fcbf","ieee_address":"0x001788010363fcbf"},"type":"device_joined"}'
Zigbee2MQTT:info  2022-12-10 10:40:28: Starting interview of '0x001788010363fcbf'
Zigbee2MQTT:info  2022-12-10 10:40:28: MQTT publish: topic 'zigbee2mqtt/bridge/event', payload '{"data":{"friendly_name":"0x001788010363fcbf","ieee_address":"0x001788010363fcbf","status":"started"},"type":"device_interview"}'
Zigbee2MQTT:info  2022-12-10 10:40:29: Successfully interviewed '0x001788010363fcbf', device has successfully been paired
Zigbee2MQTT:info  2022-12-10 10:40:29: Device '0x001788010363fcbf' is supported, identified as: Philips Hue White A60 Single bulb E27/B22 (8718696449691)

…don’t come from my code. You mentioned that this was printed out to the console… something else must be doing this too.

[therealdb]

@akbooer said in Migrating Zwave & ZigBee stuff to MQTT - guidance needed.:

Some investigation required here. The existing Color service definition defines three actions of interest:

setColor
setColorRGB
setColorTemperature

It's not clear from the service file definition what the possible value/syntax is for any of these commands, so that would mean delving into the UPnP documentation, which, previously, I've found to be an absolute nightmare (as are most international standard definitions.) Perhaps csomeone here can aleady tell us the answer?

I've done a lot of work on the color side of thing in the Vera, and my code used to work on openluup as well. Feel free to take inspiration from https://github.com/dbochicchio/vera-VirtualDevices/blob/master/L_VirtualRGBW1.lua

From line 134 you'll find all the formats that luup is supporting, at least on Vera's side. There's also W/D, for warn and cool white.

[a-lurker]

@akbooer said in Migrating Zwave & ZigBee stuff to MQTT - guidance needed.:

don’t come from my code. You mentioned that this was printed out to the console… something else must be doing this too.

Yes - this is the output from z2m to its terminal, which I am monitoring. ie from the z2m server. Not from openLuup.

So the z2m server is interviewing the newly detected device and recognises it; next it ends up being created in openLuup!

[akbooer]

@a-lurker said in Migrating Zwave & ZigBee stuff to MQTT - guidance needed.:

So the z2m server is interviewing the newly detected device and recognises it; next it ends up being created in openLuup!

Mystery solved (partially.) From the docs:

zigbee2mqtt/bridge/devices

”Contains the devices connected to the bridge, this message is published as retained. Whenever a device joins or leaves this is republished.”

…but this doesn’t explain why the devices are not identified correctly.

[a-lurker]

@akbooer

zigbee2mqtt/bridge/devices
”Contains the devices connected to the bridge, this message is published as retained. Whenever a device joins or leaves this is republished.”

Well this turns out to be the case. Neither openLuup or z2m logged this, as you can see in the logs provided above. However I added logging some code to openLuup and yes and as expected the zigbee2mqtt/bridge/devices topic is published each time you add & remove a zigbee device, which is great. Would be good to see openLuup log the json info when any topic is RX'ed and when MQTT is in debug mode. mqttExplorer would have picked this up but it wasn't running at the time.

Here is the definition json for the dual general purpose outlet (GPO):

{
	"date_code": "",
	"definition": {
		"description": "Ikuü double power point with USB",
		"exposes": [{
			"endpoint": "left",
			"features": [{
				"access": 7,
				"description": "On/off state of the switch",
				"endpoint": "left",
				"name": "state",
				"property": "state_left",
				"type": "binary",
				"value_off": "OFF",
				"value_on": "ON",
				"value_toggle": "TOGGLE"
			}],
			"type": "switch"
		}, {
			"endpoint": "right",
			"features": [{
				"access": 7,
				"description": "On/off state of the switch",
				"endpoint": "right",
				"name": "state",
				"property": "state_right",
				"type": "binary",
				"value_off": "OFF",
				"value_on": "ON",
				"value_toggle": "TOGGLE"
			}],
			"type": "switch"
		}, {
			"access": 1,
			"description": "Instantaneous measured power",
			"endpoint": "left",
			"name": "power",
			"property": "power_left",
			"type": "numeric",
			"unit": "W"
		}, {
			"access": 1,
			"description": "Instantaneous measured electrical current",
			"endpoint": "left",
			"name": "current",
			"property": "current_left",
			"type": "numeric",
			"unit": "A"
		}, {
			"access": 1,
			"description": "Measured electrical potential value",
			"endpoint": "left",
			"name": "voltage",
			"property": "voltage_left",
			"type": "numeric",
			"unit": "V"
		}, {
			"access": 1,
			"description": "Sum of consumed energy",
			"name": "energy",
			"property": "energy",
			"type": "numeric",
			"unit": "kWh"
		}, {
			"access": 1,
			"description": "Link quality (signal strength)",
			"name": "linkquality",
			"property": "linkquality",
			"type": "numeric",
			"unit": "lqi",
			"value_max": 255,
			"value_min": 0
		}],
		"model": "SPPUSB02",
		"options": [{
			"access": 2,
			"description": "Calibrates the power value (percentual offset), takes into effect on next report of device.",
			"name": "power_calibration",
			"property": "power_calibration",
			"type": "numeric"
		}, {
			"access": 2,
			"description": "Calibrates the current value (percentual offset), takes into effect on next report of device.",
			"name": "current_calibration",
			"property": "current_calibration",
			"type": "numeric"
		}, {
			"access": 2,
			"description": "Calibrates the voltage value (percentual offset), takes into effect on next report of device.",
			"name": "voltage_calibration",
			"property": "voltage_calibration",
			"type": "numeric"
		}],
		"supports_ota": false,
		"vendor": "Mercator"
	},
	"endpoints": {
		"1": {
			"bindings": [{
				"cluster": "genBasic",
				"target": {
					"endpoint": 1,
					"ieee_address": "0x84b4dbfffecc0c6f",
					"type": "endpoint"
				}
			}, {
				"cluster": "genOnOff",
				"target": {
					"endpoint": 1,
					"ieee_address": "0x84b4dbfffecc0c6f",
					"type": "endpoint"
				}
			}, {
				"cluster": "haElectricalMeasurement",
				"target": {
					"endpoint": 1,
					"ieee_address": "0x84b4dbfffecc0c6f",
					"type": "endpoint"
				}
			}, {
				"cluster": "seMetering",
				"target": {
					"endpoint": 1,
					"ieee_address": "0x84b4dbfffecc0c6f",
					"type": "endpoint"
				}
			}],
			"clusters": {
				"input": ["genBasic", "genGroups", "genScenes", "genOnOff", "seMetering", "haElectricalMeasurement", "manuSpecificTuya", "genIdentify"],
				"output": ["genOta", "genTime"]
			},
			"configured_reportings": [{
				"attribute": "rmsVoltage",
				"cluster": "haElectricalMeasurement",
				"maximum_report_interval": 3600,
				"minimum_report_interval": 5,
				"reportable_change": 5
			}, {
				"attribute": "rmsCurrent",
				"cluster": "haElectricalMeasurement",
				"maximum_report_interval": 3600,
				"minimum_report_interval": 5,
				"reportable_change": 50
			}, {
				"attribute": "activePower",
				"cluster": "haElectricalMeasurement",
				"maximum_report_interval": 3600,
				"minimum_report_interval": 5,
				"reportable_change": 1
			}, {
				"attribute": "onOff",
				"cluster": "genOnOff",
				"maximum_report_interval": 3600,
				"minimum_report_interval": 0,
				"reportable_change": 0
			}],
			"scenes": []
		},
		"2": {
			"bindings": [{
				"cluster": "genOnOff",
				"target": {
					"endpoint": 1,
					"ieee_address": "0x84b4dbfffecc0c6f",
					"type": "endpoint"
				}
			}],
			"clusters": {
				"input": ["genGroups", "genScenes", "genOnOff", "manuSpecificTuya", "genIdentify"],
				"output": []
			},
			"configured_reportings": [{
				"attribute": "onOff",
				"cluster": "genOnOff",
				"maximum_report_interval": 3600,
				"minimum_report_interval": 0,
				"reportable_change": 0
			}],
			"scenes": []
		},
		"242": {
			"bindings": [],
			"clusters": {
				"input": [],
				"output": ["greenPower"]
			},
			"configured_reportings": [],
			"scenes": []
		}
	},
	"friendly_name": "0x842e14fffe13d0d5",
	"ieee_address": "0x842e14fffe13d0d5",
	"interview_completed": true,
	"interviewing": false,
	"manufacturer": "_TZ3210_pfbzs1an",
	"model_id": "TS011F",
	"network_address": 64390,
	"power_source": "Mains (single phase)",
	"supported": true,
	"type": "Router"
}

To recognise this GPO, the function infer_device_type() needs to have a minor change:

    --elseif exp.switch then
    elseif exp.type == "switch" then

That's not going to help very much as the device has two outlets and hence two independently controllable relays. It also has Voltage, current & power measurement but to make everything more difficult the power measurement is the addition of the power consumed by both outlets. This implies the device needs to be represented as a single parent with two children. Gets a bit messy.

The json defines two "Endpoint"s: "Endpoint: left" & "Endpoint: right". I note that ZWave JS UI takes the same sort of approach of making use of endpoints for compound devices.

Looking through the zigbee devices database you see identifiers such as follows - for compound devices:

state
state_left, state_right
state_left, state_center, state_right
state_top, state_center, state_bottom
state_l1, state_l2, state_l3, state_l4  --> state_lX
state_top_left, state_center_left, state_bottom_left, state_top_right, state_center_right, state_bottom_right,

The dual GPO under discussion returns this payload regularly:

{
  "current_left": 0,
  "energy": 0,
  "linkquality": 252,
  "power_left": 0,
  "state_left": "OFF",
  "state_right": "OFF",
  "voltage_left": 245
}

In fact, straight after purchase, it was returning this about every two seconds but fortunately in the z2m web page, you can change the reporting interval.