ESP8266 Connection Issue: Unable to Send HTTP Requests After Initial Mobile App Connection – Are There Permission Problems?

Question

ESP8266 Connection Issue: Unable to Send HTTP Requests After Initial Mobile App Connection – Are There Permission Problems?

ERGEN 0

I have an ESP8266 device that operates in AP mode, waiting for the SSID and password of the local Wi-Fi network to be entered, and connects to the internet once entered. It has a static IP address, and there is no issue with this device; it works fine.

I also have a mobile application that performs Wi-Fi scanning and connects to the network after entering the password (e.g., home internet). This part also works fine.

However, after the mobile application initially connects to the ESP8266, I am unable to send HTTP requests.

If I connect to the ESP8266 for the first time from the phone's Wi-Fi network, and then connect from the application at any time, it works.

During the first connection from the phone's Wi-Fi network, I get the following options under the "No internet" warning:

Only this time

Always (I need to select this option)

Cancel

However, when connecting from the application, this warning does not appear, and HTTP requests do not go through. I also cannot send HTTP requests from Chrome on the phone.

The application is connected, and the ESP8266 shows the connection in all cases, so there is no issue with the connection. The IP address is static, so it cannot be incorrect.

I have already granted the following permissions:

<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />

<uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />

<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" />

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />

<uses-permission android:name="android.permission.INTERNET" />

It is clear that there is a permission issue, but I have not been able to resolve it. Thanks in advance to anyone who can help.

Yonglun Liu (Shanghai Wicresoft Co,.Ltd.) 50,126 Reputation points Microsoft External Staff

2024-08-05T02:25:16.1233333+00:00
For further investigation, could you please provide the following information?

The MAUI version and Android API level.

Could you please provide specific steps or minimal code snippet that can reproduce this issue?

Does this problem only occur on physical ESP8266 devices?

Your prompt reply will be highly appreciated.
ERGEN 0 Reputation points

2024-08-05T05:23:43.5733333+00:00
Hello,

Thank you for your prompt reply.

I am using .NET MAUI version 8.0 with a minimum target of Android 5.0.

Below, I have provided the code snippets for WiFi scanning and connecting.

This issue occurs on all devices that do not have an internet connection.

private async Task GetWifiList()
{
try
{
loading.IsVisible = true;
PermissionStatus status = await Permissions.RequestAsync<Permissions.LocationWhenInUse>();
if (status == PermissionStatus.Granted || DeviceInfo.Current.Platform == DevicePlatform.WinUI)
{
await Task.Delay(10000);
loading.IsRunning = true;
scanCollectionView.IsVisible = false;
var response = await CrossWifiManager.Current.ScanWifiNetworks();
networkDataModel.Clear();
foreach (var item in response)
{
networkDataModel.Add(new NetworkData()

{
StausId = item.StausId,
IpAddress = (int)item.IpAddress,
Bssid = item.Bssid,
Ssid = item.Ssid,
GatewayAddress = item.GatewayAddress,
NativeObject = item.NativeObject
});
}
scanCollectionView.ItemsSource = networkDataModel;
}
else
{
await DisplayAlert("No location permission", "Please provide location permission", "OK");
}
}
catch (Exception ex)
{
await DisplayAlert("Error", ex.Message, "OK");
}
finally
{
loading.IsRunning = false;
scanCollectionView.IsVisible = true;
}
}

private async void Btn_Wifi_Connect_Clicked(object sender, EventArgs e)
{
var button = sender as Button;
var networkData = button?.BindingContext as NetworkData;
var selectedSsid = "Local-SSID-name";
var password = "Local-Password";
if (networkData != null && !string.IsNullOrWhiteSpace(networkData.Ssid))
{
var response = await DisplayPromptAsync($"Connect to {networkData.Ssid}", "Enter the password:");
/* if esp8266 accept password thi code use*/

/*
if (!string.IsNullOrWhiteSpace(response) && response.Length >= 8)
{ }
else
{
await DisplayAlert("Invalid Password", "Please enter a valid password (at least 8 characters)", "OK");
}
*/

var networkDataResult = await CrossWifiManager.Current.ConnectWifi(networkData.Ssid, ""); if (networkDataResult != null)

{
try
{
using var httpClient = new HttpClient();
var responses = await httpClient.GetAsync("http://192.168.10.1"); // esp8266 Test static IP adress
await DisplayAlert("Connection Status", "Failed to connect", "OK");
await Task.Delay(2000);
var selectedSsids = await DisplayActionSheet("Select Network", "Cancel", null, networkDataModel.Select(n => n.SsidName).ToArray());
if (!string.IsNullOrWhiteSpace(selectedSsids))
{
var passwords = await DisplayPromptAsync($"Connect to {selectedSsids}", "Enter the password:", "OK", "Cancel", "Password", -1, Keyboard.Text, "");
if (!string.IsNullOrWhiteSpace(passwords) && passwords.Length >= 8)
{
await SendWifiDetailsToESP(selectedSsids, passwords);
}
else
{
await DisplayAlert("Invalid Password", "Please enter a valid password (at least 8 characters)", "OK");
}
}
}
catch
{
await DisplayAlert("Connection Status", "Failed to connect", "OK");
}
}
else
{
await DisplayAlert("Connection Status", "Failed to connect", "OK");
}
}
}
Yonglun Liu (Shanghai Wicresoft Co,.Ltd.) 50,126 Reputation points Microsoft External Staff

2024-08-06T06:24:38.3666667+00:00

Thanks for your feedback.

Since there is no same device to test with, could you please provide what errors occur in this code at runtime?
ERGEN 0 Reputation points

2024-08-06T07:33:00.7366667+00:00
Thanks for your feedback.

In general, there are no issues with the code. The problem lies in the permission granted when connecting to the Wi-Fi network. Let me explain step by step.

The ESP8266 operates as an Access Point (AP) without any internet connection. To connect the ESP to the internet, I need to switch it from AP mode and connect it to the available internet network.

Note: The ESP's SSID is not saved on the phone.

When connecting to the ESP from the phone's Wi-Fi network, I receive the following options under the "No internet access" warning:

Only this time

Always

Cancel

I choose the "Always" option to allow the connection and save the SSID. From that point on, as long as I do not forget the SSID, the connection works seamlessly every time I connect again, even from Maui. Not only in Maui but also from Chrome(on phone), I can send requests without any issues.

However, if I perform the above steps from the beginning in Maui:

Note: The ESP's SSID is not saved on the phone.

I perform a Wi-Fi scan in .NET Maui, find the ESP SSID, and connect to it. The option to save the SSID appears, but the "No internet access" Always option does not appear. I can see that it is connected to the ESP from the ESP's serial output, indicating that it connects to the AP network but does not send HTTP requests. Thinking there might be an error in the code, I attempt to send a request from Chrome (on phone) , but there is no response from there either.

thank you
Yonglun Liu (Shanghai Wicresoft Co,.Ltd.) 50,126 Reputation points Microsoft External Staff

2024-08-07T07:02:51.54+00:00

Thanks for your feedback.

Usually, only dangerous permissions will pop up in the app, such as location, contacts, etc. In your case, it is better to post it to GitHub to confirm with the development team if this is an expected behavior.

Your answer

Yonglun Liu (Shanghai Wicresoft Co,.Ltd.) 50,126 Reputation points Microsoft External Staff

2024-08-05T02:25:16.1233333+00:00

For further investigation, could you please provide the following information?

The MAUI version and Android API level.

Could you please provide specific steps or minimal code snippet that can reproduce this issue?

Does this problem only occur on physical ESP8266 devices?

Your prompt reply will be highly appreciated.
Yonglun Liu (Shanghai Wicresoft Co,.Ltd.) 50,126 Reputation points Microsoft External Staff

2024-08-06T06:24:38.3666667+00:00

Thanks for your feedback.

Since there is no same device to test with, could you please provide what errors occur in this code at runtime?
ERGEN 0 Reputation points

2024-08-06T07:33:00.7366667+00:00

Thanks for your feedback.

In general, there are no issues with the code. The problem lies in the permission granted when connecting to the Wi-Fi network. Let me explain step by step.

The ESP8266 operates as an Access Point (AP) without any internet connection. To connect the ESP to the internet, I need to switch it from AP mode and connect it to the available internet network.

Note: The ESP's SSID is not saved on the phone.

When connecting to the ESP from the phone's Wi-Fi network, I receive the following options under the "No internet access" warning:

Only this time

Always

Cancel

I choose the "Always" option to allow the connection and save the SSID. From that point on, as long as I do not forget the SSID, the connection works seamlessly every time I connect again, even from Maui. Not only in Maui but also from Chrome(on phone), I can send requests without any issues.

However, if I perform the above steps from the beginning in Maui:

Note: The ESP's SSID is not saved on the phone.

I perform a Wi-Fi scan in .NET Maui, find the ESP SSID, and connect to it. The option to save the SSID appears, but the "No internet access" Always option does not appear. I can see that it is connected to the ESP from the ESP's serial output, indicating that it connects to the AP network but does not send HTTP requests. Thinking there might be an error in the code, I attempt to send a request from Chrome (on phone) , but there is no response from there either.

thank you
Yonglun Liu (Shanghai Wicresoft Co,.Ltd.) 50,126 Reputation points Microsoft External Staff

2024-08-07T07:02:51.54+00:00

Thanks for your feedback.

Usually, only dangerous permissions will pop up in the app, such as location, contacts, etc. In your case, it is better to post it to GitHub to confirm with the development team if this is an expected behavior.

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ESP8266 Connection Issue: Unable to Send HTTP Requests After Initial Mobile App Connection – Are There Permission Problems?

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