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cgxWP4Wu77s The purpose of this tutorial is to cover the various communication options available for B4X developers. Will start with two important utilities: AsyncStreams: Asynchronously reads and writes to any stream and avoids blocking the main thread. Do not assume that messages will arrive as

It is a class: AsyncStreamsText - Useful when working with streams of text
link: Never mind. I have figured out it is not a library. Show's how new I am at B4J. I used B4A about a decade ago for one bluetooth but so much has change
link: I thought it was part of the RandomAccessFile library. Have you found it somewhere else?
link: Where can I find the AsyncStreamsText library? I can only find references to it. I'm just learning B4J and want to use a serial port. Thanks

AsyncStreamsText relies on having end-of-line characters - ie CHR(13) and/or CHR(10) - to mark the end of a packet line, and thus won't work for your data which is fixed-length packets with no end-of-packet marker.
link: Presumably this: class asyncstreamstext useful when-working with streams of text Which would work great with the example incoming data, if that data
link: sorry it does not work, on my side I managed to have it. Now I have the full string but I don't understand how to dump if I take sb.Length or buffer.L

AsyncStreamsText will cut the message here End Sub Sub AStream_NewData (Buffer() As Byte) For i = 0 To Buffer.Length - 2 Step 2 Dim ledNumber As Byte = Buffer(i) Dim value As Boolean = Buffer(i + 1) = 1 leds(ledNumber).DigitalWrite(value) Next End Sub
link: Sub Timer1_Tick astream.Write("Millis here: ".GetBytes) astream.Write(NumberFormat(Millis, 0, 0).GetBytes) astream.Write(Array As Byte(10)) 'end
link: Probably like this sample: Sub Timer1_Tick astream.Write("Millis here: ".GetBytes) astream.Write(NumberFormat(Millis, 0, 0).GetBytes) astream.W

The purpose of AsyncStreamsText is to collect the data from multiple packets and find complete messages. You shouldn't assume that the data arrives in a single packet. So your code is not correct. You should wait for NewText to be raised and only then you know that a complete message was received.
link: I am running AsyncStreamsText classes on an internal network (TCP/IP) and I would say that all of my communications end with the "_Terminated" event b
link: Thanks for the info Erel. I assume trying to use this event would not give me a chance to send an acknowledgement (200 OK) message because the AsyncSt
link: There is no timeout. The event is raised when the other side has closed the connection.

Why use AsyncStreamsText? The simplest way is with AsyncStreams in prefix mode. Start with this example: Network + AsyncStreams + B4XSerializator
link: Hello thetahsk. Thank you taking the time to try and help me out. Yes, I saw the tutorial (and another about the AsyncStreams specifically) but none
link: Hello udg, thank you for the welcome, and so fast!! I have used many languages over the years, all scientific including HPL from Hewlett Packard and
link: For example, if I have 6 bytes being sent, do I send 0,0,0,6 in Big Endian or Little Endian? At the moment, I am not getting bytes across, but as the

Hello friends, This is my first but not last post in forum :D When I checked B4J_chat.zip file in Erel's post, I see that there is an old .fxml designer file that can not be recognized by B4J 9.8. I succeed to convert 1.fxml to 1.bjl file and succeed to make communicate Hercules (a terminal progra

I suggest you have a look at the AsyncStreamsText class.
link: Hi Steve, Your comment re: prefix and non-prefix mode suggests you are using AsyncStreams whereas I suggested using the AsyncStreamsText class. I su
link: I agree, except that the original post stated "again no CRLF needed". But if it is guaranteed that the incoming stream has CRLF-terminated lines, and
link: @stevewidget, looking back I did misread your original post because I thought by your comment "after I modified to send CRLF" that you'd changed from

AsyncStreamsText.Write expects a string not an array of bytes.
link: Hi, My B4A program using asyncstreamstext writes a simple text: Main.Stream2.write("Start") to a B4J program also using asyncstreamstext. The error

Erel's right: AsyncStreamsText is a better solution, provided that your data doesn't include ASCII 10 (line feed). Also, note that AsyncStreamsText interprets the incoming bytes as UTF8, which means that ASCII byte values 0..127 will be fine (except for end-of-line bytes 10 and 13), but byte values
link: 1. Don't use activities at all and especially not with projects dealing with communication. 2. Use StringBuilder to concatenate strings. Your current
link: Why aren't you using AsyncStreamsText?
link: I use AsyncStreams in non-prefix mode for receiving bluetooth messages (HC 05, controlled by a STM32). The messages end on chr(13), only then they ar

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