Android Question AsyncStreamsText

fernando.oliboni · Aug 10, 2021

Hi, I need help. In the code below I send commands to ESP32 and I can only send a new command if ESP32 responded with an OK. I have the "ast_NewText" event that returns the response from ESP32, but I don't know how to include it in "FOR". can anybody help me?

B4X:

Dim cursor1 As Cursor
            cursor1 = SQL1.ExecQuery("SELECT linha FROM gcode order by numerador")
            For i = 0 To cursor1.RowCount - 1
                cursor1.Position = i
                Dim linha As String = cursor1.GetString("linha")
                ast.Write(linha & Chr(13))
                
                'I need to wait for an OK return from ESP32 to send a new command. What can I put here to wait for OK?

                    
            Next
            cursor1.Close

Erel · Aug 10, 2021

You can do something like this, but it can cause other problems:

B4X:

ast.Write(...)
Wait For ast_NewText(Text As String)

This will work if the ESP can only send OK.

A more robust solution is to create a List with all the values that you need to send and send the next one in the ast_NewText event:

B4X:

Private Sub ast_NewText(Text As String)
 If Text = "OK" Then
  If Queue.Size > 0 Then
    Dim linha As String = Queue.Get(0)
     ast.Write(...)
    Queue.RemoteAt(0)
 End If
End Sub

fernando.oliboni · Aug 10, 2021

Erel said:
You can do something like this, but it can cause other problems:

B4X:

ast.Write(...) Wait For ast_NewText(Text As String)

This will work if the ESP can only send OK.

A more robust solution is to create a List with all the values that you need to send and send the next one in the ast_NewText event:

B4X:

Private Sub ast_NewText(Text As String) If Text = "OK" Then If Queue.Size > 0 Then Dim linha As String = Queue.Get(0) ast.Write(...) Queue.RemoteAt(0) End If End Sub

Hi Erel, yours is very interesting, I'll put it into practice and let you know if it worked.

fernando.oliboni · Aug 10, 2021

Hi Erel, it worked perfectly, thank you very much.

fernando.oliboni · Aug 10, 2021

error: (IOException) java.io.IOException: bt socket closed, read return: -1

Why did I get this error?

Erel · Aug 11, 2021

Better to start a new thread and provide more information. It isn't related to AsyncStreamsText.

Android Question AsyncStreamsText

fernando.oliboni

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Erel

B4X founder

fernando.oliboni

Active Member

fernando.oliboni

Active Member

fernando.oliboni

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Erel

B4X founder

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