In the last two years we updated `jmdns` (which is being used to discover network boards) to address security and performance problems in the older versions. The boards are now added/removed based on the information coming from that library, so if a board disappears it is due to mdns reporting the "disconnection".

[jcflyer]

Below problem solved. Updating Python from 2.7.13 to 3.7.2 fixed the ports disappearing problem. Adding a delay(300); after web page html code but before client.stop() fixed the slow web page display in desktop Chrome on XP and Windows 10. Android Chrome was always fast.

I have used Arduino IDE 1.6.11 on a wired desktop running XP SP2 to wirelessly program 4 Nodemcu devices without any problem for over a year.
I got a new laptop with Windows 10 and installed 1.6.11 and all the network ports show up and work immediately but then disappear and the port is greyed out in a minute or so.
I can only upload once or twice before the port is gone.
If I restart the laptop the ports show up and work again for a short time. Nothing I have tried has worked so far including allowing port 8266 or turning off the firewall.
Also compiling is very slow now.

[per1234]

It's not useful to report problems that occur with outdated versions of the Arduino IDE. Please always download the Hourly Build of the Arduino IDE and test with that version to verify the problem still occurs before opening an issue report:
https://www.arduino.cc/en/Main/Software#hourly

After doing so, please comment here to let us know whether your issue has been resolved or not.

[jcflyer]

OTA for nodemcu only works with old ide versions. New version 1.8.8 from MS store does the same thing.

[matthijskooijman]

I would also suggest taking this up with the maintainers / community of the esp8266 core (e.g. submit a support request there, through whathever channel they prefer (I suspect their forum). They might be able to comment on whether this is expected to work and perhaps fix things on the esp core side. If the outcome is that there is a bug in the Arduino IDE, this is the place to come back to then.

[facchinm]

@jcflyer in the original post you are talking about using 1.6.11 in both XP and windows10 and mdns discovery only works in the former, right? Or are you comparing 1.6.11 with 1.8.8?

[jcflyer]

Thanks for your reply. Correct. I have used 1.6.11 on XP for over a year with no issues. At the time newer versions wouldn't work with Nodemcu boards. I also use old Python 2.7.13 as required for OTA uploading at the time. It's weird that on Windows 10 1.6.11 works fine, finds all the boards and uploads OK but only for a minute or so. Then the port is greyed out and you have to restart to try again. All of the boards are still on the network as they all host web pages that still work and they all still show up on XP. Something happens after a minute or so on Windows 10 that kills the ports showing up. XP with wired ethernet on a desktop is no problem. John

…

On Mon, Jan 21, 2019 at 3:47 AM Martino Facchin ***@***.***> wrote: @jcflyer <https://github.com/jcflyer> in the original post you are talking about using 1.6.11 in both XP and windows10 and mdns discovery only works in the former, right? Or are you comparing 1.6.11 with 1.8.8? — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#8408 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AecvYQf_UiMVoVK-Sv_713o1QflSw2M0ks5vFX6OgaJpZM4aJmPr> .

[jcflyer]

Attached are screenshots from Windows 10 showing all ports initially then Port greyed out after a minute. XP doesn't do this on wired ethernet. My laptop doesn't have an ethernet port so I can't try it wired.

…

On Mon, Jan 21, 2019 at 3:47 AM Martino Facchin ***@***.***> wrote: @jcflyer <https://github.com/jcflyer> in the original post you are talking about using 1.6.11 in both XP and windows10 and mdns discovery only works in the former, right? Or are you comparing 1.6.11 with 1.8.8? — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#8408 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AecvYQf_UiMVoVK-Sv_713o1QflSw2M0ks5vFX6OgaJpZM4aJmPr> .

[facchinm]

Hi @jcflyer ,
can I ask you to test the latest Beta https://www.arduino.cc/en/Main/Software#beta ?
You'll see two menus for both serial ports and mdns ports; one is bundled while the other is pluggable and based on https://github.com/arduino/mdns-discovery .
If the pluggable one works better it would greatly accelerate the switch.
Let me know! Thanks!

[jcflyer]

The problem was the Python version I was using with Windows 10. Python 3.7.2 works OK but 2.7.13 makes the ports disappear after a minute on Windows 10. 2.7.13 is fine with XP. Adding a delay(300); after html definition but before client.stop() fixed all the other problems. Now the web pages display very rapidly in desktop Chrome in XP and Windows 10. Android display in Chrome was always very fast. I followed instructions for OTA programming and it said you had to use old versions of Arduino IDE and old Python version 2.7.13 or it wouldn't work. Normally all my programming was done with an old XP SP2 desktop, Arduino 1.6.11 and the web page HMIs hosted on the Nodemcus were displayed and interacted with using my Android phone, tablet or tv box. All the home automation programs are uploaded wirelessly OTA since the Nodemcus are remotely located. All of this has worked great for over a year. All the web pages display quickly in Android Chrome but painfully slowly in XP or Windows 10. If you want to see the web pages and what I am doing go to: https://sites.google.com/site/nodemcu12e/ Code for one of them is a the bottom. It's a mishmash of code cut and pasted from many sources. It works fine with XP and Android. My Android tablet died so I am trying to replace it with a new Windows 10 laptop. I want to use it to program instead of XP and display the web page HMIs as well. Neither OTA programming nor web page display works properly in my case. The Python update someone suggested fixed the ports disappearing problem but uploading OTA only works with very small programs like Blink and none of the web pages display properly or at all. The Nodemcus often crash requiring a reload of Basic OTA if I try to load the identical working programs from Windows 10 instead of XP. I tried Arduino 1.8.8 and Python 3.7.2 but I have the same problems. Only Arduino 1.6.11 on XP with Python 2.7.13 for OTA uploading works properly in my case. The programs are fairly large since they include a lot of html code for the web pages. Web page display on Android Chrome devices takes less than 2 secs. Same web page display on Windows 10 desktop Chrome is 22+ secs or won't display at all. Win10 with Internet Explorer browser is 5 secs or so but one web page won't display at all. I have had nothing but problems for days now trying to get Windows 10 working the same as XP SP2 and Android Chrome for web page display that has worked properly for over a year now. Very frustrating. John

…

On Wed, Jan 23, 2019 at 9:43 AM Martino Facchin ***@***.***> wrote: Hi @jcflyer <https://github.com/jcflyer> , can I ask you to test the latest Beta https://www.arduino.cc/en/Main/Software#beta ? You'll see two menus for both serial ports and mdns ports; one is bundled while the other is pluggable and based on https://github.com/arduino/mdns-discovery . If the pluggable one works better it would greatly accelerate the switch. Let me know! Thanks! — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#8408 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AecvYQ64GWy1XykzgjSL0zl99djwRHztks5vGHUrgaJpZM4aJmPr> .

[Bbas11]

I had the same problem with ports disappearing since 1.8.6. If i restart the IDE they would show for a few seconds then there gone. Latest beta fixed it. Now two ports show for each board. if i select one the other one gets selected also. All the ports always show up now in both versions now. No problems with flashing. Looks like its finally fixed.
Windows 10, python 2.7 basic arduinoOTA sketch.

[pfeerick]

I think the issue is in the Arduino IDE, as when I open the ports menu the first time after opening the IDE (v1.8.8) on linux, I see four of the five mDNS OTA ready devices listed... if I close the menu (not the IDE), and immediately reopen the ports menu... all but one is missing (and which one is shown is sometimes random between restarts of the Arduino IDE). But I can see all five devices in the PlatformIO mDNS list, and also using zeroconfbrowser - so they are reporting correctly, but the IDE does not show them. I have the same issue of not all devices showing on Windows (also v1.8.8), but I can't swear that it exhibits the same "some then one" behaviour. I tried running 1.8.1 of the IDE on Windows just after 1.8.8, and all of the devices are listed.

@facchinm I'll try the beta version on Windows also, and let you know what my results are ;) So just tried the latest 1.9.0 beta build, and mDNS discovery seemed to be much, much more reliable than previous versions of the IDE after a few minutes of poking around and seeing what breaks. Didn't have any issues with only some devices being discovered, devices being lost between refreshes of the menu, and all devices that should have been discovered were discovered. My only question is about menu duplication - bug / work in progress gremlin / board support package related / other?