Running latest FW on C7 hub and just noticed that my last device communication was over 5 hours ago. Appears all my z-wave devices have gone offline. (my zigbee devices appear ok)
Done a network repair and get message saying all nodes are unreachable.
What specific FW are you running? Rebooting my temporarily fix it, but depending on your answer to the first question, it may impact other steps. Are you in the beta program?
The usual suggestion is to shut down the hub gracefully then unplug from power for 30 seconds to reset the radio
FW 2.4.0.151
reboot was the first thing i tried then the network repair.
I dont do beta's- only the official releases, which has been current for several weeks now.
reboot isn't a fix for these symptoms. A power cycle is the traditional advice.
Seems very similar to this post from yesterday. Could just be coincidence, but both are C7 hubs.
Thanks for that tip. Done that and everything appears to be working again.
i did get this notification-
Hub load is elevated.
Review runtime statistics for apps and drivers when you can.
I guess these reports are based on how long the device has been running, so given its only been rebooted a few minutes, a device that is 40% might have no significance at this time?
Should i now do anything else, ie network repair?
I wouldn't worry too much about the 'Hub load elevated'. Give it a while and check back as I've had that sometimes at boot up or after an update.
i want to add something to this thread as i believe it could be the cause and it may tie in with my other recent thread:
https://community.hubitat.com/t/best-practices-to-place-and-orientate-a-hub
This morning, I added a new wifi device (small arduino wifi unit) located a few feet away from my hub.
This coincides with when my z-wave network went down. Could it be that this close proximity of a wifi signal upset the hub?
How can i avoid this happening again or lessen the chance of it happening again?
Z-wave and WiFi operate on frequencies that are pretty far apart, so it’s not especially likely.
Zigbee and WiFi both use the 2.4GHz part of the spectrum so that can result in interference issues sometimes.
That could explain why i've had a few zigbee issues recently- i added another arduino-wifi device the other week and had some zigbee comms failures during that time.
Assuming the arduino wifi is 2.4GHz, could a RF burst when the arduino was initiated have affected the Hub being in close proximity?
For optimal Hubitat performance, the best WiFi settings include:
using a wired connection whenever possible, choosing a less congested 2.4 GHz channel (like 1 or 6), keeping your Hubitat away from your router to minimize interference, and ensuring a stable DHCP reservation on your router to assign a consistent IP address to the Hubitat if using WiFi, consider using a dedicated network for smart devices to further reduce interference.
Key points to remember:
Hubitat recommends a wired connection to your network whenever possible for the most reliable performance.
According to most Hubitat users, the best Zigbee channel setting is typically channel 20 as they generally provide stable results with minimal interference from most WiFi channels; however, it's important to check your local WiFi network and adjust accordingly to avoid overlap, with some recommending using a WiFi channel like 1 or 6 to further minimize interference.
Place your Hubitat away from your WiFi router to avoid potential signal interference.
Set up a DHCP reservation on your router to ensure your Hubitat always gets the same IP address, which is crucial for consistent connectivity.
thanks for the extra info.
i have always used a wired connection (the C7 doesnt have wifi to my knowledge)
I have always had a static IP address for my hub too.
The wifi router is the other side of a couple of brick walls about 20 foot away
i have a wifi scanning app on my computer though it only scans channels 1-14 (i see my routers and the neighbours routers on various channels within this range)
the hub-zigbee is on the default channel 20 (i'm UK, so dont know how this differs from other regions)
the hub zigbee scans channels 11-26 and is picking up something unidentified on channel 23
I believe i am following best practices as much as possible
If you're on a C8, there can sometimes be issues using channel 20. If things work, you can leave things be. If you are having Zigbee issues on a C8 and you're on 20, the usual recomendation would be to change to another channel, 25 is generally recommened, but 15 could also help (though it tends to be closer to potential 2.4ghz interference depending on the environment). This channel issue does not apply to C7, C5, etc., as the C8 line has a different Zigbee chip than the earlier hubs.
Download the Hubitat app
