Android Question Increase response time of AsyncStream

FreeWolF · Apr 23, 2014

Hello, with the function AsyncStream, I can send and receive data from a device. The data is sent correctly, but SOMETIMES, the response of the device, is cut off, that is, the answer is a bit slow and is cut into two parts, so I can see only the second part. Is possible to put a delay or something like that at the time of receipt of the buffer?

Thanks in advance!

Erel · Apr 24, 2014

This is how network streams work. Messages can be split or merged.

See AsyncStreams tutorial: AsyncStreams Tutorial

FreeWolF · Apr 25, 2014

Ok Thanks a lot

FreeWolF · May 9, 2014

Excuse me, but I don't understand how to append 2 or more packets received from astreams.

I need to receive a string of bytes with 34 characters like this:

01030CAE0500320000C80500320000D84C (D84C is the calculated checksum of the string so, I can't know wich is the last character of the string because it changes every time)

Sometimes I receive

030CAE0500320000C805003200

or

01030CAE05003

Is only a part of string. The astreams (or socket) is too fast and it receive only a part of the data I need.

I've tried that code but don't work..

B4X:

Dim bytes As String bytes = Converter.HexFromBytes(Buffer) Dim sr As StringBuilder sr.Initialize sr.Append(bytes).Append(CRLF).Append(bytes) EditText1.Text = sr

Any idea ? Thanks in advance!!

Erel · May 9, 2014

You should not use StringBuilder with bytes.

You can use a list and add the buffer to the list with List.AddAll.
Each item in the list will be a single byte.

You need to go over the list items each time and see whether you have a full message there.

FreeWolF · May 9, 2014

I've tried with list.addall but without success, here is my code (without list.addall)

B4X:

Sub AStreams_NewData (Buffer() As Byte) 'in questa sub devo dire cosa fare con i dati che MI ARRIVANO dallo strumento
  
  
    If Buffer.Length > 0 Then 'i dati vengono scritti dentro a Buffer() ora indico (a scopo di debug) se il buffer è vuoto oppure c'è qualcosa
        ToastMessageShow("ok", False)
    Else
        ToastMessageShow("no", False)
    End If
  
  
      
    Dim bytes As String
  
    bytes = Converter.HexFromBytes(Buffer)
          
    EditText1.Text = bytes
      
          
  
End Sub

And as I said that code don't work....
Can I set (Buffer() As Word) or (Buffer() As DWord) or something else for try? Or I'm on a wrong road?

Erel · May 9, 2014

Use Log instead of ToastMessageShow.

Please post the code with List.AddAll.

FreeWolF · May 9, 2014

Code with List.AddAll:

B4X:

Sub AStreams_NewData (Buffer() As Byte) 'in questa sub devo dire cosa fare con i dati che MI ARRIVANO dallo strumento
  
  
    If Buffer.Length > 0 Then 'i dati vengono scritti dentro a Buffer() ora indico (a scopo di debug) se il buffer è vuoto oppure c'è qualcosa
        ToastMessageShow("ok", False)
    Else
        ToastMessageShow("no", False)
    End If
  
  
    Dim lista As List
  
    lista.Initialize
    lista.AddAll(Buffer)
  
      
          
    EditText1.Text = lista
      
          
  
End Sub

Can I use the FOR cycle? For example: "FOR EACH ITEMS IN BUFFER LISTA.ADDALL(BUFFER) or something similar, but I know how to write it

Erel · May 9, 2014

You should make the list a global list and then fill it as data comes through.

Don't initialize it in this sub. See how AsyncStreamsText works.

FreeWolF · May 9, 2014

Yes, my mistake! If I initialize a list in that sub every time will reset it.

Thanks a lot Now I will try

Android Question Increase response time of AsyncStream

FreeWolF

Active Member

Erel

B4X founder

FreeWolF

Active Member

FreeWolF

Active Member

Erel

B4X founder

FreeWolF

Active Member

Erel

B4X founder

FreeWolF

Active Member

Erel

B4X founder

FreeWolF

Active Member

Similar Threads

Android Question Increase response time of AsyncStream

Active Member

B4X founder

Active Member

Active Member

B4X founder

Active Member

B4X founder

Active Member

B4X founder

Active Member

Similar Threads

Privacy & Transparency

Privacy & Transparency