I am working on an app (iOS, iPadOS & macOS (Mac Catalyst)) for a Home Automation device. I am using HomeKit APIs to access commissioned devices and provided APIs to get a MatterNodeID and then a MTRBaseDevice so I can query the device. Since the current APIs for accessing Matter devices this way do not support subscriptions I am using the readAttributes() method of the MTRBaseDevice to get information from the device. There can be significant lag time in these reads and I realize my network speed and congestion can contribute to this. The time lag makes me wonder how readAttributes() obtains the data? Does the method query the Home hub which replies using cached data, or does the hub in turn query the device to insure it is providing the latest data? I am pretty sure all this communication goes through the hub because it works whether I am on the same network as the device or in a location far, far away.

HomePod Mini running 18.6 build 22M5054/b - will not update to HomePod OS26 have tried un-enrollment, reset, removal, etc - no dice - anyone else seeing this ? Any known work arounds ? iPad is running iPadOS 26 Relase 2 - 23A5276f

I'm finding developing for HomeKit using the iOS Simulator utterly confounding. All of my home's actual HomeKit accessories show up fine when I run the HomeKit app I'm developing on my actual phone. But none show up when I run my app in the iOS Simulator. Maybe that's how it's supposed to be? I decided to run the HomeKit Accessory Simulator in an attempt to get something to show up in the iOS Simulator, but the accessories I've created there don't show up in the Simulator either. How do I get devices to show up in the iOS Simulator? Thanks.

Hi all, Since updating to iOS 18.4, I'm experiencing a regression with AppIntents triggered from Widgets. In my app, I use AppIntents inside a WidgetKit extension to control HomeKit devices. This setup was working perfectly up to iOS 18.3. However, starting with iOS 18.4, when the AppIntent is triggered from the widget and the main app is not running, the action fails with this error: Error Domain=HMErrorDomain Code=80 "Missing entitlement for API." UserInfo={ NSLocalizedFailureReason=Handler does not support background access, NSLocalizedDescription=Missing entitlement for API. } Interestingly, the exact same AppIntent works fine if the app is still alive in the background — it seems like the failure only occurs when the intent is handled by the widget process. This looks like a behavior change or new restriction introduced in iOS 18.4. Has anyone experienced the same? Is there a new entitlement needed, or a recommended workaround? Thanks in advance!

Hi, I have tried to add Eve energy plug but still pairing failed, it reported always same error. Error Domain=com.apple.MatterSupport Code=1 "(null)" Could anyone help? Regards

How to remove Matter accessory connection artefacts? This appears after connecting and then removing a Matter test accessory. Please see attached screenshot:

My app has been working fine until just recently, now it can not add Matter devices over Thread (Wifi commissioning still works). I didn't change anything on my side, so not sure if an update maybe changed things? In any case, reading through my logs (and i have the matter/thread debug profiles installed). it seems like the device is added to the thread network fine, and it looks to me like the phone is successfully commissioning the device to the Apple setup fabric, but then it seems to choke on this line and i don't think the device is actually added to the keychain/matter db, so it fails later on . error 12:18:03.369036-0700 homed [2610726604/1195614123(679130348)] failed to find metric hmmtrAccessoryMetricNameCommissioningAccessory to complete I can confirm the device does join my thread border router as its pingable, and it does not seem to be in setup mode anymore (light stops flashing), so i assume it thinks its commissioned. The device i'm pairing is a Onvis (matter certified) outlet to an espressif build of a OTBR. My phone is running 18.4.1 if that matters (no pun intended) . I have also cleared out existing Matter pairings from the phone, as well ensured the device was factory reset before every try. Here is a snippet of the log towards the end where is looks like pairing works, but then errors out. I would post more but my post has a 7k character limit. default 12:18:02.836555-0700 homed Success status report received. Session was established default 12:18:02.836734-0700 homed SecureSession[0x9bb100f00, LSID:64711]: State change 'kEstablishing' --> 'kActive' default 12:18:02.837438-0700 homed Successfully finished commissioning step 'kFindOperationalForStayActive' default 12:18:02.837467-0700 homed Commissioning stage next step: 'kFindOperationalForStayActive' -> 'ICDSendStayActive' default 12:18:02.837500-0700 homed Performing next commissioning step 'ICDSendStayActive' default 12:18:02.837574-0700 homed Skipping kICDSendStayActive default 12:18:02.837627-0700 homed Successfully finished commissioning step 'ICDSendStayActive' default 12:18:02.837650-0700 homed Commissioning stage next step: 'ICDSendStayActive' -> 'kFindOperationalForCommissioningComplete' default 12:18:02.837670-0700 homed Performing next commissioning step 'kFindOperationalForCommissioningComplete' default 12:18:02.838036-0700 homed Found an existing secure session to [2:000000009B9C86CC]! default 12:18:02.838149-0700 homed Successfully finished commissioning step 'kFindOperationalForCommissioningComplete' default 12:18:02.838697-0700 homed Commissioning stage next step: 'kFindOperationalForCommissioningComplete' -> 'SendComplete' default 12:18:02.838893-0700 homed Performing next commissioning step 'SendComplete' default 12:18:02.839092-0700 homed <<< [E:35494i S:64711 M:193726318] (S) Msg TX from 0000000086BCA241 to 2:000000009B9C86CC [47A0] [UDP:[fd01:11b8:de1c:1:968a:c465:6fe8:e12a]:5540] --- Type 0001:08 (IM:InvokeCommandRequest) (B:59) default 12:18:02.839133-0700 homed ??1 [E:35494i S:64711 M:193726318] (S) Msg Retransmission to 2:000000009B9C86CC scheduled for 2910ms from now [State:Active II:800 AI:800 AT:4000] default 12:18:02.839257-0700 homed <<< [E:35493i S:0 M:19014618 (Ack:7538941)] (U) Msg TX from 3251BD376C43B658 to 0:0000000000000000 [0000] [UDP:[fd01:11b8:de1c:1:968a:c465:6fe8:e12a]:5540] --- Type 0000:10 (SecureChannel:StandaloneAck) (B:26) default 12:18:03.356373-0700 homed >>> [E:35494i S:64711 M:174417481 (Ack:193726318)] (S) Msg RX from 2:000000009B9C86CC [47A0] to 0000000086BCA241 --- Type 0001:09 (IM:InvokeCommandResponse) (B:70) default 12:18:03.356559-0700 homed Received Command Response Data, Endpoint=0 Cluster=0x0000_0030 Command=0x0000_0005 default 12:18:03.356584-0700 homed Received CommissioningComplete response, errorCode=0 default 12:18:03.356622-0700 homed Successfully finished commissioning step 'SendComplete' default 12:18:03.356648-0700 homed Commissioning stage next step: 'SendComplete' -> 'Cleanup' default 12:18:03.356746-0700 homed Performing next commissioning step 'Cleanup' default 12:18:03.356803-0700 homed Successfully finished commissioning step 'Cleanup' default 12:18:03.356916-0700 homed Closing all BLE connections default 12:18:03.357084-0700 homed Auto-closing end point's BLE connection. default 12:18:03.358146-0700 homed SecureSession[0x9bb1003c0, LSID:64710]: State change 'kActive' --> 'kPendingEviction' default 12:18:03.358652-0700 homed Commissioning complete for node ID 0x000000009B9C86CC: success default 12:18:03.358678-0700 homed <MTRDeviceController_Concrete: 0x9b8e33100, uuid: 3F6C2281-D873-4D82-BE3E-722446EA66E7, suspended: NO> DeviceControllerDelegate Commissioning complete. NodeId 0x000000009b9c86cc Status src/controller/CHIPDeviceController.cpp:2932: Success ... default 12:18:03.367999-0700 homed <MTRDeviceController_Concrete: 0x9b8e33100, uuid: 3F6C2281-D873-4D82-BE3E-722446EA66E7, suspended: NO> 1 delegates called for -[MTRDeviceController controller:commissioningComplete:nodeID:metrics:] error 12:18:03.369036-0700 homed [2610726604/1195614123(679130348)] failed to find metric hmmtrAccessoryMetricNameCommissioningAccessory to complete error 12:18:03.426636-0700 HomeUIService Unexpected accessory setup progress CASE Session Sanity Check Passed default 12:18:03.426850-0700 homed Could not find home with valid fabric ID corresponding to fabric UUID: FB19AA02-5E34-40C5-BB9D-B1B1AF51E08B ... error 12:18:03.460841-0700 homed [188914BD-5163-425C-9E59-CAE9BFA1A288] Could not find system commissioner pairing for newly staged server with identifier f1:64:16:3f:79:b8 in all pairings: ( .. default 12:18:03.460906-0700 homed Answering incoming message HMASC.m.confirmDeviceCredential (186EE57F-330B-435F-A949-0E4C5D6954AB) from client 'HomeUIService' that expects a response with error Error Domain=HMErrorDomain Code=2 "(null)" error 12:18:03.461167-0700 HomeUIService [BD890E19] Failed to stage CHIP accessory pairing in steps: Error Domain=HMErrorDomain Code=2 "(null)" error 12:18:03.462121-0700 HomeUIService -[HSSetupStateMachineCHIPPartnerConfiguration stageCHIPAccessory]_block_invoke Failed to stage CHIP accessory: Error Domain=HMErrorDomain Code=2 "(null)" default 12:18:03.462172-0700 HomeUIService -[HSSetupStateMachineConfiguration setPairingError:] *** Setting pairingError *** = Error Domain=HMErrorDomain Code=2 "(null)"

I'm developing a Matter-over-thread generic switch with 2 generic switch endpoints. This is configured as an Intermittently Connected Device with Long Idle Time. I have an Apple TV serving as the thread border router. I'm able to commission the device successfully in the Home app and assign actions to each of the buttons however when the device is rebooted the subscription doesn't appear to resume successfully and the buttons no longer work. I've tested this on various SOC's with their respective SDKs including ESP32-C6, nrf52840 and EFR32MG24 and the behaviour was consistent across all of them. It was working originally when I first started out on the ESP32-C6, then the issue popped up first when I was testing the nrf52840. In that SDK I set persistent subscriptions explicitly and it seemed to resolve the issue until it popped up again when I found that unplugging and restarting the Apple TV completely which appeared to fix the issue with subscriptions not resuming. Recently I've added a Home Pod Mini Gen 2 to the matter fabric so there are now two TBR on the network and restarting both the Apple TV and the HomePod doesn't appear to resolve the issue anymore and the subscriptions are not resuming across all three SOC's on device reboot I'm wondering if there might be something preventing the subscriptions from resuming?

I'm device manufacturer and in future planning to get my device matter certified. If I want my device data for analytics purpose into my cloud than what is the best way possible. My research says that the most latest approach suggested by apple is, developing a custom mobile app using device homekit sdk and subscribe to device state and send it to my cloud. If I go that route, will it work even though the device was onboarded via homekit app and homekit hub device is also there. I want to make sure that both path will be active, device to hub to home app and device to custom app to my cloud, and both on matter ecosystem. The homekit sdk and matter support mentioned here https://developer.apple.com/apple-home/matter, are these two same thing?

Apologies in advance for the long post. I'm new to HomeKit and Matter but not to development, I'm trying to write a SwiftUI app for my smart home to store all of my HomeKit and Matter setup barcodes along with other bits of information. The intention is to scan the QR codes with my App and then save that QR payload in a simple Database along with other manually entered device details. Example payloads: X-HM://00GWIN0B5PHPG <-- Eufy V120 HomeKit Camera MT:GE.01-C-03FOPP6B110 <-- Moes GU10 Matter Bulb I have it 99% working, my app is even able to discern the manual pairing code from the above payloads. However one of the key feature of this is that I want to open a device entry in my app and tap the HomeKit or Matter code displayed in my app and and either: a) Ideally pass it off to the Apple Home app to initiate pairing just like the native Camera App can. b) Create a custom flow in my app using the HomeKit or Matter API's to initiate paring from within my app. So ideally just like the flow that happens when you scan a setup QR with the normal camera and tap "Open in Home". However I want to trigger this flow with just knowing the Payload and not with scanning it via the camera. I was hoping there might be something as simple as a URL scheme that I could call with the payload as a variable and it then deep links and switches to the Home app, but I haven't found any info relating to this that actually works. This is some code I have tried with the HomeKit API but this also results in an error: import HomeKit func startHomePairing(with setupCode: String) { // Handle HomeKit setup guard let payload = HMAccessorySetupPayload(url: URL(string: setupCode)!) else { print("Invalid HomeKit setup code or format.") return } let setupRequest = HMAccessorySetupRequest() setupRequest.payload = payload let setupManager = HMAccessorySetupManager() // Perform the setup request and handle the result setupManager.performAccessorySetup(using: setupRequest) { result, error in if let error = error { // Error handling: print the error details print("Error starting setup: \(error.localizedDescription)") // Print more details for debugging print("Full Error: \(error)") } else { // Success: pairing was successful print("Successfully launched Home app for HomeKit setup.") } } } But when passing in the QR payloads above it give the following .. HomeKit Code [0CAB3B05] Failed to perform accessory setup using request: Error Domain=HMErrorDomain Code=17 "(null)" Matter Code Failed to create HMSetupAccessoryPayload from setup payload URL MT:GE.01-C-03FOPP6B110: Error Domain=HMErrorDomain Code=3 "(null)" I have added the "HomeKit" and "Matter Allow Setup Payload" capabilities to my app, I have also ensured I have these in the .plist .. <key>NSHomeKitUsageDescription</key> <string>Access required to HomeKit to initiate pairing for new accessories</string> I also added a call to ensure my app appears in the Settings / Privacy / HomeKit section. I originally thought was a seemingly simple task, but I am really struggling with how to make it work!