Hörmann IT-WLAN is a HomeKit accessory for Hörmann garage doors. Unfortunately, its WLAN module is very picky with Wi-Fi settings, and it generally has problems when we try to control it outside the local Wi-Fi network.
I had too many problems with it both in local network and from a cellular connection. It generally worked correctly from the local network, but occasionally I got the dreaded No response error. When I opened the garage door from the local network, entered my car and got out it nearly never worked with the cellular connection. Sometimes, after 20 minutes or so, it would start working.
Pinging the device would lose 5% or more pings every time.
I have a Linksys Velop mesh network at my house. Putting one node in the garage did no improvement. Unfortunately it does not have any expert configuration options. I tried an old AirPort Extreme which was even worse. Pinging the device constantly made a little improvement, but did not go far. So, I decided to live with the situation until I remembered an Asus DSL-AC68U lying unused.
I put it in the garage as an access point. For the 2.4 GHz network, I configured the following:
- DTIM Interval: 1
- Beacon Interval: 50 ms
- Airtime Fairness: Disable
That’s all. The device immediately started working correctly. No ping losses, no No response errors. Moving between the local network and cellular connection does not create any problems. The device is always responsive. Even CarPlay started working correctly as long as iOS remembers to update the CarPlay interface. Sometimes that does not happen and you need to launch the Home app on the iPhone, but that immediately corrects the situation. That is an iOS problem though, not IT-WLAN‘s.
So, if you also have problems with IT-WLAN, just put an access point device with expert configuration options near it and configure the above settings.