It is impossible to connect to the ESP32 AP mode Wifi from a PC, but the connexion works with a phone.
I am using a really simple code I found on this site : https://techtutorialsx.com/2018/01/07/esp32-arduino-http-server-over-soft-ap/. I am using Platformio on VsCode to upload the code on the ESP32.
I tried connecting to the ESP32 from multiple PC (Windows 10 and 11) and it doesn't work, but it works when I connect any phone to the wifi. From time to time, to connexion is established for a few seconds, then disconnect without an apparent reason.
Thanks for your help!
Related
I'm developing an application for iOS which is connecting through TCP sockets to a server aplication run on Android. In order to find the IP of the 2nd device I use a UDP request and receive the IP of the server.
It's working well all the time when I'm connecting them to Wi-Fi network or when I use the Android device as a hotspot to the iPhone. But if I want to make the iOS device a personal hotspot, I can't reach connection between the two devices and the app is useless in this regime. Is it possible to connect the devices then and is the algorithm the problem? I would be glad to hear if someone has ever had a similar problem and knows the solution.
I've previously bought a MacPro which come with ethernet port and also wifi adapter. I've my wifi turned off and the ethernet port connected with an intranet network cable.
However in my simulator, it keeps showing the error of having NO connection (my Mac can connect to intranet resources perfectly). Fyi, I also noticed that my Mac connection icon was a empty wifi icon, which it means I don't have connection? I just wan my Mac to default to ethernet connection, and my iOS simulator should be able to connect to intranet as expected.
Any help please?
iOS simulator uses the same network interface what your MAC is supporting at present.
"I also noticed that my Mac connection icon was a empty wifi icon" It means Wifi is turned off… It doesn't mean that you don't have connection.
Let me know if more info needed.. :)
I am currently running a robotic's project using an Hokuyo (URG-04LX-UG01 - http://www.hokuyo-aut.jp/02sensor/07scanner/urg_04lx_ug01.html). This one is plugged to my computer using USB. Although it creates the port "/dev/ttyACM0" when I plug it, I can't connect to it using the associated library (serial connection error). Until here, nothing's strange, bugs or misprogramming happens but here is my problem :
When I plug the hokuyo to an USB HUB, which is also plugged to my computer, I can connect to it and everything works perfectly.
My laptop is a samsung 900x3c running Linux Mint 15.
Do you know what an USB HUB changes in the USB communication ?
Is there a link with my laptop ? (I used to face the same problem using an ARM-Based embedded computer)
Is it possible to fix the issue without using any hardware solution ?
If it's not, is there anything more compact than an USB HUB which could fix it ?
Thanks !
Is your USB-HUB powered from external power adapter? URG-04LX-UG01 seems to consume 2,5W/5V=0,5A. This is limit for USB. Laptop USB ports are not so powerful and if device consumes a little bit more than max, then they just cut the power.
Update
The device is USB 2.0 Full Speed. I've seen USB controller, that had problems with USB 1.0 or USB 2.0 devices. Hub presents itself as USB 2.0 High Speed and handles USB 2.0 Full Speed transparently for the Laptops USB controller. Do you have another Laptop/PC to check this?
I'm kind of late on my feedback for that issue, but better late then never so :
I've been able to determine that the whole issue came from my USB cable. Somehow there was an electrical issue in that cable and the computer-or the hokuyo- was not able to properly communicate through it. I think that the USB HUB was somehow able to correct theses electrical issues.
Anyway, problem solved !
I have a Symbol PPT8800 that will not connect to Windows Mobile Device Center. It was working, I took it off the cradle, did a hard reset, and now it's not connecting. Is there a setting on the HH itself that is preventing the connection?
I have other Symbol PPT8800's that will connect in the same cradle without an issue.
There are a lot of possible sources for connection problems between a windows mobile handheld device and a PC running WMDC (ActiveSync).
use a known good USB cable
connect USB cable directly into PC and avoid USB hub
verify WMDC connects with another windows mobile device
disconnect handheld and reboot you PC and wait until PC is booted
before trying to connect
"Allow USB connections" has been deselected in WMDC Connection
Settings
sometimes the device setting "Enable advanced network functionality"
in Start/Settings/Connections/"USB to PC" has to be unchecked (or
checked).
the device has a corrupted registry and does not start the connect
(repllog.exe) or does not authenticate correctly. Do a clean boot or
wipe of the device to get the device back to factory defaults
I am sorry, but there are many possible issues that can cause a WMDC connection to fail. Recently I had the prob that after sleep/resume of my PC the USB hubs were in power save mode and I was unable to get device to connect to WMDC.
Does your PC do some 'boing' sound when you attach the USB cable to the device?
What does Hardware Device Manager show? Any exclamation marks?
EDIT: How to wipe a device?
You need to write either a small .net or c++ app using DMProcessConfigXML and the following wap provisioning xml:
<wap-provisioningdoc>
<characteristic type="RemoteWipe">
<parm name="doWipe" value="1"/>
</characteristic>
</wap-provisioningdoc>
[see also http://peterfoot.net/UsingRemoteWipe.aspx]
or use RapiConfig tool from Mobile SDK.
If both are not useable for you (is that running Windows Mobile or Windows CE?) or just restore factory default or reflash the device. If it is a device with Windows Mobile before version 5, you can just do a cold boot but delete any persistent folder first (ie Flash File Store or ???).
Factory restore of PT 8800:
hold white RESET button + POWER + FUNC
I am working on a Mac that has an Ethernet connection to a LAN and the Internet. I have an iOS application that I am running in the simulator that needs to connect to a WiFi network in another office. I turned on Airport and connected to the WiFi network I need, but I don't know if the simulator is using the Ethernet or Wifi connection to communicate. I looked for settings in the simulator and couldn't find a way to tell it to use the WiFi connection exclusively.
Thanks for your help.
A coworker answered this question for me today. Apparently, the iOS simulator does not do WiFi. It only knows about a network connection. He said the simulator simply reports that there's a connection, but it's not WiFi.
Hope this helps someone.
I guess iOS Simulator uses whatever network connection is available tot the Computer it is running on. If there are multiple Connections it should scan both IP ranges... I don't exactly know how it handles the case both ip ranges are the same... This is (even if possible) no good solution, because you never exactly know if there are multiple devices with the same IP...