P2 Motion Sensor Commissioning Failures

[JohnD]

I connected the P2 Motion Sensor to Aqara Home, Apple Home and Home Assistant. It works for me without any problems.

It is important that you only use the sticker with the Matter code the first time and then use the code in the app (Multi-Admin).

Here the complete process:

@JohnD

Matter Pairing of Devices

Initial Pairing (Onboarding)

1. Open the app of your choice (e.g., Apple Home or Aqara Home) to integrate the device into the respective ecosystem and scan the Matter QR Code found on the device or in the manual.
2. Your smartphone usually connects to the device via Bluetooth to exchange initial data.
3. The app passes the access credentials for your network (Wi-Fi or Thread) to the device. The device connects and is now part of your Smart Home.

Connecting to Additional Systems (Multi-Admin)

1. Generate Code: Go to the app with which you connected the device first (e.g., Aqara Home). Important: Do not use the sticker on the device for this second step.
2. Activate Mode: Look in the device settings for an option like “Matter Pairing Code” (Aqara) or “Turn On Pairing Mode” (Apple).
3. Copy Code: The app will now generate a new, digital QR code (or a numeric code). The code is usually in the format 0000-000-0000. When copying, ensure the format is correct (some apps require the hyphens, some do not).
4. Second Pairing: Now open the second app (e.g., Alexa or Home Assistant) and scan this QR code (or paste the numeric code). Important: Pairing should be done immediately, as the generated code is time-limited (usually 15 minutes).

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Regarding the error message:

@saurabh1

The commissioning process consistently fails with:

[pair-retransmission-limit-reached] Failed to connect on any discovered server

There could also be other reasons for the error message, such as a faulty IPv6 configuration in HA, blocked mDNS (Multicast DNS) or subnets/VLANs, an active VPN on the smartphone, incorrect thread network credentials or the p2 sensor is too far away and has no connection.

First, check whether Home Assistant has received a correct IPv6 address under:

Settings ->System → Network → Configure network interfaces → IPv6

Are there any IP addresses that start with “fd” or “2a”?

Other question: Had the hub serving as the thread border router been reset beforehand?