@markz said in Strange set of Duet Wifi connection issues cant wrap head around:

I have five Asus routers running here and the ones running the latest firmware require occasional reboots. iOS, in particular, stops connecting reliably to the WiFi while Android rarely fails. iOS messages "Unable to Join Network" randomly.

So your Asus routers with the latest firmware are the most troublesome?

But, you should definitely try what @Phaedrux suggested using AP to test. It could be a network problem.

I will try this again

And, to be clear, you've made sure that your DHCP server fixed address range doesn't conflict with your DHCP grant range so it isn't serving the Duet IP address to someone else during the day.

I have ensured this is the case. Thank you for these suggestions, I will try these things in the next couple of days.

@markz It does seem like that, but out of the 32 clients connected to the router this is the only one I haven't been able to get working correctly with regards to things like port forwarding , firewalls, DHCP Manual IP reserves etc. so I guess I just need to know what to do with my router for the Duet to get it to work? It is almost like the issue when you upload a large file when the WiFi stops responding, except I checked the SD card cluster size (it's 64kb) and 512 byte sectors. So I thought that it was going to be the card, because that sounded exactly like that behavior, everything works great for a time after a reboot, but SOMETHING causes SOMETHING to limit connectivity to the Duet on mobile first.

@Phaedrux I tried before I updated all my firmware from RRF 2 and it made no difference, but I will try it again now that I am on RRF 3.

@markz I do use the IP address rather than name. One Windows device is connected by WiFi the other is not, but both can connect no problem. I will try switching back and forth on my desktop machine between WiFi and Ethernet to see if that makes any difference.

@Phaedrux It does sound like a router error I agree, but that's the only device giving me consistent issues, and I seem to have a fairly robust network with a combination of wired and wireless . Mostly wired when I can, so I guess it must be a router setting I have yet to come across? I was thinking it was a WLAN issue, but then why would the laptop connect?

The router is an Asus RT-AX88U. The firmware is: main - RepRap 3.4.4, and Wifi Module firmare is 1.27

So I can connect to my Duet 2 Wifi with my Windows computers both Laptop and desktop, and my Apple iPod and Android Phone no problem after a fresh router reboot. Sometime after, and I have not figured out what triggers it, I can no longer connect to the Duet with my mobile devices, but I can with Windows, AND ALSO, the router no longer shows the Duet as connected in my list of devices as it used to, yet I can ping it, and it works fine through Windows. I can connect and disconnect the Duet from the network and reboot the Duet as much as I like and the only way to get back Android and iOS functionality and the ability to see the device as being connected to the router is by rebooting the router itself. I do use a manually reserved IP for the Duet.
Fully up to date on all firmware as far as I know.

I have a signal strength of -45dBm as reported in through M122: Diagnose.

I also checked the SD card specs:
SD card in slot 0: capacity 3.90GB, partition size 3.90GB, free space 3.85GB, speed 20.00MBytes/sec, cluster size 64kB

The read speed might be a little slow, this was what was reported:
SD read speed for 20.0MByte file was 0.84MBytes/sec
SD write speed for 20.0MByte file was 2.00MBytes/sec

I did buy the ESP-07S external module, although I haven't installed it yet, and I am now considering putting in an ethernet module, but feel that I am close, so maybe there is a solution? I have been working on this for two years now and am out of ideas.

Firmware: RepRapFirmware for Duet 2 WiFi/Ethernet 2.05.1
Duet Web Control 2.1.3

I can't see my messages on Duet Web Control on either my computer or on mobile, however they are there on my PanelDue. It is like it is a font color issue or something, but doesn't show up in dark mode either. I've attached two photos of my computer DWC showing both modes, one of my mobile, and one of my PanelDue. If anyone knows how to fix this I would appreciate the advice!