# Adding and readding devices failure **URL:** \ **Category:** Questions & Help\ **Tags:** homey-pro-2023\ **Created:** [August 13, 2024, 5:50pm UTC](https://community.homey.app/t/adding-and-readding-devices-failure/114347 "2024-08-13T17:50:17Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![Nisse\_Hellgren](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/nisse_hellgren/32/86036_2.png) [@Nisse\_Hellgren](https://community.homey.app/u/Nisse_Hellgren)\ **Post date:** [August 13, 2024, 5:50pm UTC](https://community.homey.app/t/adding-and-readding-devices-failure/114347/1 "2024-08-13T17:50:18Z")
I succesfully added one Sonoff temperature device to Homey (early 2023) and I tried to add another but this failed. I removed the added device and tried to readd it but this failed. I removed another Sonoff device but this device could not be readded either. So, now I have -2 Sonoff devices instead of 3 or more. I cannot figure out what goes on. It seems like a lottery to add devices. I have tried to install a zigbee extender as a router and after this installation add one of the Sonoff devices as an end device but this also failed. So what to do? Is there a varying maximum number of zigbee devices that can be added to Homey (early 2023)? ---
**Author:** ![PeterHa](https://avatars.discourse-cdn.com/v4/letter/p/94ad74/32.png) [@PeterHa](https://community.homey.app/u/PeterHa)\ **Post date:** [August 13, 2024, 10:13pm UTC](https://community.homey.app/t/adding-and-readding-devices-failure/114347/2 "2024-08-13T22:13:08Z")
Yes there is a limit, have a look to this thread… > [@\[HOW TO\] Plan and setup your Zigbee network](https://community.homey.app/t/how-to-plan-and-setup-your-zigbee-network/94770): > > This post is concerning The order of adding Zigbee devices to your Homey Pro/Bridge (AKA “Coordinator” or “hub”). Know that there is a best approach to in which order you connect your devices. You have at least three major category of devices. Which to connect when, that’s what I will dive into in this article. What are the issues? So, cutting right to the chase: The most common issues you will run into with your zigbee devices, is either unreachable devices or you’ve added the maximum of devi… I’m using also the Sonoff temoerature sensor, and I had no problems with the installation. Have you tried to restart the Sonoff-App and/or to restart the HP23? ---
**Author:** ![Nisse\_Hellgren](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/nisse_hellgren/32/86036_2.png) [@Nisse\_Hellgren](https://community.homey.app/u/Nisse_Hellgren)\ **Post date:** [August 14, 2024, 7:58am UTC](https://community.homey.app/t/adding-and-readding-devices-failure/114347/3 "2024-08-14T07:58:23Z")
Yes I tried to restart the app and my HP23. I also tried to uninstall and reinstall the app. I emptied app cache memory. But none of these measures solved my problem. How does HP23 handle zigbee devices? Theoretically a 16 bit address should be able to handle 2 to the power of 16 which is a lot of devices. I have three aeotec extenders that I think work as zigbee routers. At least one of them extended my possibility to read outside devices. But I think it depends on the HP23 how zigbee devices are added or not. But still, I cannot find a solution to my problem adding Sonoff devices. ---
**Author:** ![PeterHa](https://avatars.discourse-cdn.com/v4/letter/p/94ad74/32.png) [@PeterHa](https://community.homey.app/u/PeterHa)\ **Post date:** [August 14, 2024, 4:53pm UTC](https://community.homey.app/t/adding-and-readding-devices-failure/114347/4 "2024-08-14T16:53:39Z")
Does it happen only with Sonoff devices? In that case I would raise the question in the Sonoff thread for the community app > [@\[APP\]\[Pro\] SONOFF Zigbee](https://community.homey.app/t/app-pro-sonoff-zigbee/36418): > > This app makes Homey support SONOFF Zigbee devices! SONOFF Takes Care of Your ‘Home’ “Founded out of a simple need: make your lives easier, smart and better. we’ve the ambition to design and create the most innovative smart products with a simple and affordable way to give you a smarter home.” / SONOFF Supported devices: SNZB-01 / WB01 - Wireless Switch SNZB-01P - Wireless Button SNZB-02D - Temperature and Humidity sensor with LCD screen SNZB-02P / SNZB-02 / TH01 - Temperature and Humidity… or raise a ticket with the link from the app page of the official app > **[Sonoff | Homey](https://homey.app/de-de/app/se.styrahem.sonoff.zigbee/Sonoff/)** > > Bringt Ihr Zuhause zum Leben Depends which app you are using.