iOS Question [SOLVED] - iNET - ftp issue

Jmu5667 · Feb 4, 2021

Hello

I have implemented the ftp component for the purpose of uploading a log file to a FileZilla server. I have already done this on b4a with much success. However on B4i as I am unable to close the connection when then job is completed,(I can see the connection open on the server) , I have to wait for the server to close the connection. If I let this happen and try to send another file upload it does not happen. It seems to become available again after 3-5 mins.

I have read the after each execution the connection is closed, this does not appear to happen for me and I have to wait for the server to timeout the connection.

Ideas ?

Regards

John.

Erel · Feb 4, 2021

It is expected to reuse the same connection.

This code works fine here:

B4X:

ftp.PassiveMode = True
For i = 1 To 10
    File.WriteString(xui.DefaultFolder, i, i)
    Wait For (ftp.UploadFile(xui.DefaultFolder, i, False, target & i)) FTP_UploadCompleted (ServerPath As String, Success As Boolean)
    Log(ServerPath & ", " & Success)
Next

If it doesn't work with your server then your best option is to create a new FTP object (Dim + Initialize) every time.

Jmu5667 · Feb 4, 2021

This the func:

B4X:

Sub send_logs_ftp
        
    Dim lfile As String
    lfile = $"iSOS_${mod_functions.make_date_string(DateTime.Now)}_${APPSET.IMEI}.log"$
    ' // cleanup filename
    lfile = lfile.Replace("/",".")
    lfile = lfile.Replace(":",".")
    lfile = lfile.Replace(" ","_")
    
    mod_functions.writeLog($"Sending log file ${lfile}"$)
    Try
        ' // create log file name
        File.Copy(File.DirDocuments,"vsos.log",File.DirDocuments,lfile)
        
        Dim ftp    As FTP
        ftp.Initialize("ftp", "xxxxx.islesystems.com", 21, "xxxxx", "xxxxxxx")
        ftp.PassiveMode = True

        Dim sftp As Object = ftp.UploadFile(File.DirDocuments, lfile, True, "/" & lfile)
        Wait For (sftp) ftp_UploadCompleted (ServerPath As String, Success As Boolean)

        If Success Then
            mod_functions.writeLog($"${ServerPath} was uploaded successfully"$)
            hd.ToastMessageShow("File was uploaded successfully",False)
        Else
            mod_functions.writeLog($"${ServerPath} - Error uploading file"$)
            hd.ToastMessageShow("Error uploading file",False)
        End If        
        File.Delete(File.DirDocuments,lfile)
        
        ftp.SendCommand("QUIT","")  <- this is new to see if the connection gets closed, but same issue.
    Catch
        mod_functions.writeLog($"send_logs::Error - ${LastException.Message} "$)
    End Try
    
    
End Sub

I am already doing as you suggested. I added a QUIT commend to see if it released it but the same issue still prevails.

Regards

John.

Erel · Feb 4, 2021

What happens with the code I posted? Does it fail to upload after from the second upload?

Jmu5667 · Feb 4, 2021

I can do lots of uploads, but once I stop doing uploads and the FileZilla server terminated the connection that when the issue arises. The func was in main I have now put into a class to see if that makes a difference when the server closes the connection.

Jmu5667 · Feb 4, 2021

Just did the test, and after the server closed the connection, and a new send was initiated, it failed. these are the logs from the app showing the failure:

B4X:

02/04/2021 13:58:05.769 - Atlas iSOS - Sending log file iSOS_2021.02.04_13.58.05_353837081304527.log
02/04/2021 13:59:49.907 - Atlas iSOS - /iSOS_2021.02.04_13.58.05_353837081304527.log - Error uploading file
Class (b4i_cls_send_logs) instance released.
Event target instance was released: ftp_commandcompleted::::

Erel · Feb 4, 2021

1. Does it work properly if you initialize FTP each time?

2. Does it work if you try to send again after it failed? This might be the best solution.

Jmu5667 · Feb 4, 2021

1. Yes, but only if the connection on the server has not been closed.
2. Yes, see the logs.

B4X:

02/04/2021 14:04:47.677 - Atlas iSOS - Sending log file iSOS_2021.02.04_14.04.47_353837081304527.log
02/04/2021 14:04:48.213 - Atlas iSOS - /iSOS_2021.02.04_14.04.47_353837081304527.log was uploaded successfully
Class (b4i_cls_send_logs) instance released.
02/04/2021 14:04:56.718 - Atlas iSOS - Sending log file iSOS_2021.02.04_14.04.56_353837081304527.log
02/04/2021 14:04:57.016 - Atlas iSOS - /iSOS_2021.02.04_14.04.56_353837081304527.log was uploaded successfully
Class (b4i_cls_send_logs) instance released.
02/04/2021 14:04:59.287 - Atlas iSOS - Sending log file iSOS_2021.02.04_14.04.59_353837081304527.log
02/04/2021 14:04:59.613 - Atlas iSOS - /iSOS_2021.02.04_14.04.59_353837081304527.log was uploaded successfully
Class (b4i_cls_send_logs) instance released.
02/04/2021 14:05:01.689 - Atlas iSOS - Sending log file iSOS_2021.02.04_14.05.01_353837081304527.log
02/04/2021 14:05:01.996 - Atlas iSOS - /iSOS_2021.02.04_14.05.01_353837081304527.log was uploaded successfully
Class (b4i_cls_send_logs) instance released.
02/04/2021 14:05:04.046 - Atlas iSOS - Sending log file iSOS_2021.02.04_14.05.04_353837081304527.log
02/04/2021 14:05:04.361 - Atlas iSOS - /iSOS_2021.02.04_14.05.04_353837081304527.log was uploaded successfully
Class (b4i_cls_send_logs) instance released.
02/04/2021 14:05:06.214 - Atlas iSOS - Sending log file iSOS_2021.02.04_14.05.06_353837081304527.log
02/04/2021 14:05:06.519 - Atlas iSOS - /iSOS_2021.02.04_14.05.06_353837081304527.log was uploaded successfully
Class (b4i_cls_send_logs) instance released.
02/04/2021 14:05:08.378 - Atlas iSOS - Sending log file iSOS_2021.02.04_14.05.08_353837081304527.log
02/04/2021 14:05:08.684 - Atlas iSOS - /iSOS_2021.02.04_14.05.08_353837081304527.log was uploaded successfully
Class (b4i_cls_send_logs) instance released.
02/04/2021 14:05:10.640 - Atlas iSOS - Sending log file iSOS_2021.02.04_14.05.10_353837081304527.log
02/04/2021 14:05:10.955 - Atlas iSOS - /iSOS_2021.02.04_14.05.10_353837081304527.log was uploaded successfully
Class (b4i_cls_send_logs) instance released.
02/04/2021 14:05:13.017 - Atlas iSOS - Sending log file iSOS_2021.02.04_14.05.13_353837081304527.log
02/04/2021 14:05:13.321 - Atlas iSOS - /iSOS_2021.02.04_14.05.13_353837081304527.log was uploaded successfully
Class (b4i_cls_send_logs) instance released.
02/04/2021 14:05:16.068 - Atlas iSOS - Sending log file iSOS_2021.02.04_14.05.16_353837081304527.log
02/04/2021 14:05:16.392 - Atlas iSOS - /iSOS_2021.02.04_14.05.16_353837081304527.log was uploaded successfully
Class (b4i_cls_send_logs) instance released.
02/04/2021 14:07:21.289 - Atlas iSOS - Sending log file iSOS_2021.02.04_14.07.21_353837081304527.log
02/04/2021 14:08:06.584 - Atlas iSOS - /iSOS_2021.02.04_14.07.21_353837081304527.log - Error uploading file
Class (b4i_cls_send_logs) instance released.
02/04/2021 14:10:14.504 - Atlas iSOS - Sending log file iSOS_2021.02.04_14.10.14_353837081304527.log
02/04/2021 14:10:15.041 - Atlas iSOS - /iSOS_2021.02.04_14.10.14_353837081304527.log was uploaded successfully
Class (b4i_cls_send_logs) instance released.

The red entry is the failure after the server closed the connection. The green is the next upload that was successful after a short period of time.
I wonder is it the FileZilla Server 0.9.60 beta that is causing this. Do you have the same issue as me with the same test ? What FTP server are you using ?

Regards

John.

Erel · Feb 4, 2021

Truth is that it is better to get rid of the FTP feature and switch to http. Safer and will work better.

Code that retries to upload:

B4X:

For i = 1 To 5
 Wait For (send_logs_ftp) Complete (Success As Boolean)
 If Success Then Exit
 Log("Failed to upload. Retrying...")
 Sleep(500)
Next

Erel · Feb 4, 2021

send_logs_ftp should return a ResumableSub.

Jmu5667 · Feb 4, 2021

Ok, thanks will look into it.

Jmu5667 · Feb 4, 2021

I changed the connection timeout to 10 seconds on FileZilla and it appear to be working fine now, just thought you would like to know.

iOS Question [SOLVED] - iNET - ftp issue

Jmu5667

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