Android Question Continue to connect WiFi even no internet access

[Nitin Joshi]

In my project, i am using ESP8266 as AP. B4A application connects to SSID, set in ESP8266 as AP node. Till now everything is fine, however, initially (first time), I have to open phone's WiFi setting option to permit to continue WiFi connection even No Internet Available (otherwise phone automatically disconnects WiFi) I would like to do it inside my B4A application.
Can anyone help me to know how to do it?

Thanks and regards.

 

[Erel]

Try this: https://www.b4x.com/android/forum/threads/mqtt-chat-network-error.90892/#post-574610

 

[Nitin Joshi]

Thanks Erel, highly appreciated your feedback. I will try this...

 

[Nitin Joshi]

Hi Erel,
I have referred thread link shared by you, thank you. I have few queries which i want to clear before i implement in my B4A programe.

1) Do i need to mention SSID somewhere in the "Sub PreferWifiRouting As ResumableSub"?
2) Do i need to run this code for every time if SSID is changed?
3) Can you briefly explain logic? Without understanding logic, i am not able to copy and paste in my code.

Thank you.

 

[Erel]

The API is documented here: https://developer.android.com/refer...roid.net.ConnectivityManager.NetworkCallback)

It will cause the device to connect to one of the known wifi connections. I don't see an option here to set the SSID.

 

[Nitin Joshi]

Dear Erel,
Even I received return True from resumableSub "PreferWiFiRouting", i could not achieve my objective i.e. APP can not connect to WiFi as no internet connection available.

Please find attached snapshot of error thrown by APP. Please support

 

[Erel]

Please post logs as text, not screenshots.

The discussed API is the way to request the OS to prefer the wifi network. There isn't any other API. Make sure that the phone is connected to the correct network. If you are unable to connect then the problem is not related to your code.

 

[Nitin Joshi]

Dear Erel,
Herewith, please find below error log, however, before that I would like to brief about actions in my APP.
1) Connect button in APP connects to AP of ESP8266.
2) When connection is successful, I receive UDP packet from ESP8266.
3) Upon getting UDP packet from ESP8266, "PreferWiFiRouting" is called to connect WiFi without internet. I receive True from "PreferWiFiRouting" however in short period mobile disconnects WiFi meanwhile android message (WiFi has no internet access, connect anyway?) comes and goes.

Error Log.
Logger connected to: HUAWEI BKL-L09
--------- beginning of system
--------- beginning of main
** Activity (main) Pause, UserClosed = false **
** Activity (main) Resume **
main_udp_sent (java line: 3156)
java.net.SocketException: socket failed: ENONET (Machine is not on the network)
at libcore.io.IoBridge.socket(IoBridge.java:662)
at java.net.PlainDatagramSocketImpl.datagramSocketCreate(PlainDatagramSocketImpl.java:197)
at java.net.AbstractPlainDatagramSocketImpl.create(AbstractPlainDatagramSocketImpl.java:93)
at java.net.DatagramSocket.createImpl(DatagramSocket.java:357)
at java.net.DatagramSocket.<init>(DatagramSocket.java:259)
at java.net.DatagramSocket.<init>(DatagramSocket.java:319)
at java.net.DatagramSocket.<init>(DatagramSocket.java:291)
at anywheresoftware.b4a.objects.SocketWrapper$UDPSocket.Initialize(SocketWrapper.java:463)
at Smart.PumpV5.main._udp_sent(main.java:3156)
at Smart.PumpV5.main._local_status_tick(main.java:1535)
at java.lang.reflect.Method.invoke(Native Method)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:213)
at anywheresoftware.b4a.objects.Timer$TickTack.run(Timer.java:105)
at android.os.Handler.handleCallback(Handler.java:888)
at android.os.Handler.dispatchMessage(Handler.java:100)
at android.os.Looper.loop(Looper.java:213)
at android.app.ActivityThread.main(ActivityThread.java:8178)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:513)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1101)
Caused by: android.system.ErrnoException: socket failed: ENONET (Machine is not on the network)
at libcore.io.Linux.socket(Native Method)
at libcore.io.ForwardingOs.socket(ForwardingOs.java:217)
at libcore.io.BlockGuardOs.socket(BlockGuardOs.java:370)
at libcore.io.ForwardingOs.socket(ForwardingOs.java:217)
at libcore.io.IoBridge.socket(IoBridge.java:658)
... 19 more
--------- beginning of crash
*** Service (starter) Create ***
** Service (starter) Start **
** Activity (main) Create, isFirst = true **
** Activity (main) Resume **

 

[Erel]

Try it with airplane mode turned on and wifi enabled. This way it will not try to connect through the cellular connection.

 

[Nitin Joshi]

Dear Erel, Mobile data is always off in my device.

 

[Nitin Joshi]

Dear Erel, Can you analyse more as APP can not connect due to No Internet Access.

I have to manually (from WiFi setting) give permission to SSID to connect for the first time.

 

[Erel]

See my previous answer. This is the API that is available. There is nothing else.

 

[Nitin Joshi]

Ok Erel, noted with many thanks.

Either I am failing to program or API does not work. Anyway, I will follow manual permission to SSID, thank you.