Android Question Bluetooth big file transfer

[peacemaker]

There is a ready BT device that has protocol like
TEXT COMMAND & BINARY DATA.
No PREFIX mode is applicable, need to follow to the ready protocol.

Short commands are debugged well using Bluetooth Chat sample.
But now it needs to send big binary files, 30-130 KBytes. Write command includes ADDRESS, LENGTH, CHECKSUM bytes, and this big binary file array after them.
Device replay is the same command block as confirmation, when the command is finished OK.

Transferring speed is limited by device's FLASH memory, need 4-7 second at least.
Sending via a PC COM-port terminal is OK now.

How to tranfer using Sub AStreams_NewData (Buffer() As Byte) sub (AsyncStreams object RAF v.1.32)? Impossible for 5 second before FC offer ?
Now Android is hunging and restarts when to AStream.Write(FileDump)

 

[Erel]

The file will arrive in "pieces". You need to open an OutputStream and then write each new chunk until you reach the full length.

 

[peacemaker]

Erel, if possible, a sample, please. Where to open an OutputStream ?

 

[Erel]

Do you only need to send the large file (it is easier to send than receive)?

 

[peacemaker]

Yes, main is to send. Receiving may be needed to check that correctly sent.

 

[Erel]

You can create a memory stream with OutputStream.InitializeToBytesArray.
You can then use the ByteConverter library or RandomAccessFile to write the data.

Eventually call AStream.Write(out1.ToBytesArray)

 

[peacemaker]

Thanks !
Now tried to use

    Dim len, rest As Int
    len = FileDump.Length/20
    For i= 0 To FileDump.Length - 1 Step len
        rest = FileDump.Length - i
        If rest >= len Then
            If AStream.Write2(FileDump, i, len) = False Then
                'pause for transferring buffer
                DoEvents:DoEvents
                i = i - len
            Else
                Log(i)
            End If
        Else
            AStream.Write2(FileDump, i, rest)
        End If
    Next

Sending is OK. But strange that only files up to 20 kB, 100 kB file is out to buffer, but remote device does not reply that received.
But if to send as the file from PC by Terminal software - sent OK any variant :-(

 

[peacemaker]

Wooohoo ! Seems, it's the buggy BT device, not my app
Another device receives big files well !
Thanks, Erel !