When I click google cast icon in my chrome browser, it will try to discover whether there is an available chromecast around my pc.
If yes, then it will recognize it (assume that chromecast has already been set and connect to the same router which my pc is connected to).
My first confusion is, during this course, does my pc ever connect to chromecast's own wifi signal? Or they ONLY talk via my router?
My second confusion comes from a test:
I set 2 routers: router_A on top;router_B connects to LAN port of router_A;
My pc also connects to router_A;
chromecast dongle connects to router_B;
multicast/upnp of router B is enabled, firewall on router_B is disabled.
My pc cannot find chromecast in this situation. I'm confused and I think it should work since router_B obtains ip/gateway from router_A.
The third confusion is when I swapped my pc and chromcast, to let my pc connect to router_B, and chromecast connect to router_A, my pc found the chormcast......
After Chormecast is set up with a wifi network, it is discovered through mDNS. For (2) and (3), since discovery is done through multicast/mDNS, you need to read on that topic and look at the configuration settings of your routers to see how you can set things up to get what you want.
Related
I'm a beginer with ESP32 programming.
I'm trying to play with the example provided in https://github.com/espressif/esp-idf/tree/master/examples/wifi/getting_started/station/main and it works perfectly with my iPhone in tethering mode, however it's impossible to connect to my home access point.
I (776) wifi:mode : sta (30:c6:f7:29:c6:48)
I (776) wifi:enable tsf
I (786) wifi station: wifi_init_sta finished.
I (996) wifi:new:<1,0>, old:<1,0>, ap:<255,255>, sta:<1,0>, prof:1
I (1746) wifi:state: init -> auth (b0)
I (2746) wifi:state: auth -> init (200)
I (2746) wifi:new:<1,0>, old:<1,0>, ap:<255,255>, sta:<1,0>, prof:1
I (2756) wifi station: retry to connect to the AP
Each try fails. I tried to play with some parameters but nothing improves the situation. Any idea on how to collect more information to set the connection properly?
By the way I'm able to scan every visible network with https://github.com/espressif/esp-idf/blob/master/examples/wifi/scan/main/scan.c so this is why I guess it's configuration related...
I was having this issue. I found that, for me, the issue was not in the ESP32. It was the WiFi Router. I had the security on the router set to 'WEP' in the router. When I changed the security to 'WPA2-PSK' the ESP32 device connected right away.
I have an issue where WiFi is not available on an Android device. We want to stream image data from the device using a websocket server (written using WebSocket++) through to the PC. However, I'm not sure if this is possible without operational WiFi. So, the position we are in is that we may only have the USB link available.
Someone today suggested we might be able to get Websockets working using adb port forwarding (see https://developer.android.com/studio/command-line/adb#forwardports), but I'm not sure if that's correct. Could this work, and what would that solution look like?
Are there any other reasonable options. I'm not certain if tethering is available on the device and if that could be another solution?
I am building a project utilizing Wifi on the ESP32 module. Using RTOS, I am running a web server on 1 core and a web client on another core. This works very well and I can access the web server remotely via my browser and the WiFi provided IP address. The Web client reads some sensors and sends the data via WiFi to my database. All good and everything works as desired.
Now I need to do the next step and move beyond the reach of the WiFi and reproduce the same result via 3/4G cellular. I looked at the "easy" solution to use an industrial 3/4G WiFi router and simply keep what I have. Cost of these "industrial" type routers are on the high side, where as 3/4G module which also include a GPS chip are around half or less. Problem is that I cannot get my head around how I will "replace" my current WiFi functionality with one of these modules. The modules seems to expect you to connect via serial (rs232) and using modem AT commands establish a connection to the internet. Question is, after connecting to the internet, how do you continue to have "network functionality" same as with the built-in WiFi? Is there some library that will do ethernet over the serial port? Can I still have the WiFi and the "serial ethernet" running at the same time or switch between the two?
Thanks!
Sorry for asking such a mundane question, but I'm suddenly curious. If I open the network connections dialog on my Windows machine, it shows me a cute little picture of my computer connecting to a router and then to a globe (labeled Internet). What is Windows trying to connect to in order for it to decide that the computer has Internet connectivity? I assume there is no IP4 address for 'The Internet', so where is it going? Is it just sending a ping to an address back at the Microsoft home office? If that address were to disappear, would my window's machine suddenly decide that it no longer has a route to the Internet? Would Windows boxes that were 'close' to that address incorrectly report that they could get to the Internet when they couldn't.
I'll stop now before this gets too silly. But seriously, what criteria does a Windows box use to determine that it has Internet connectivity? I'm assuming that Linux and iOS systems have an equivalent feature. Do they use the same criteria?
The general IP address that is used for 'the internet' is 8.8.8.8 - or Google.com.
If you can ping it, and get a web page from it, then there's a pretty good chance you can get to at least some of the internet.
But for specifically Windows - Network Connectivity Status Indicator - it uses a different domain: dns.msftncsi.com
It will (unless disabled by GPO):
resolve the name, and verify it has the 'right' IP (131.107.255.255
fd3e:4f5a:5b81::1 )
Perform a HTTP get to this address and check it gets a result. NCSI
Presumably if different responses are retrieved, then it can tell if it has a wi-fi login or similar.
Your intuitions seem correct. I am not on a Windows machine but you could find out by firing netstat and then connecting.
If I was programming this I'd make Ping, TCP and HTTP requests. Some devices are connected through proxies such as firewalls, captive portals and others. the only way to be sure is to send something and receive a reply.
My Android device for example can detect captive portals. It probably does that by trying to HTTP connect somewhere.
I am trying to connect two windows phone emulators without router to form p2p network, is there any solution to connect them with access point without router and internet. and can be a possibility of using IP address of emulator.
answer plz
To the best of my knowledge no it is not possible in Mango - but is in WP8. You could however use a wireless network to perform create a UDP multicast socket and and then "connect" to one another that way.
Have a look at http://blogs.msdn.com/b/davrous/archive/2010/03/29/windows-phone-7-platformer-starter-kit-for-xna-studio-4-0.aspx it's got some pretty good pointers.