B4J Library jSerial library

Erel · Nov 21, 2013

The jSerial library allows you to open and communicate with other devices through the computer COM ports.

It can also be used to communicate with Bluetooth devices over a virtual com port.
(jBluetooth library is now available: https://www.b4x.com/android/forum/threads/jbluetooth-library.60184/)

The attached examples implement an Android <-> PC chat app.

In order to run the example you need to first pair the PC and the device and make sure that the Bluetooth is mapped to a virtual com port.

jSerial works with AsyncStreams. Both standard mode and prefix mode are supported. Note that prefix mode can only work if both sides of the connection follow the protocol.
Change AStream.InitializePrefix to AStream.Initialize to disable prefix mode.

jSerial depends on an open source project named JSSC: https://github.com/java-native/jssc

Updates:
v1.32 - Based on jssc v2.9.4.
v1.31 - Adds missing BAUDRATE, DATABITS, STOPBITS and PARITY constants.
v1.30 - Adds support for Java 11 and 64 bit computers based on: https://github.com/java-native/jssc

Instructions related to jSerial and B4J Packager 11: https://www.b4x.com/android/forum/threads/jserial-library.34762/post-735742

SimonElck · Mar 2, 2016

Ok here's the result:
The program runs without problem when started with java -jar Monitor.jar

So no logs to indicate what goes wrong when running as .exe

SimonElck · Mar 3, 2016

Any ideas?
What's the difference between the .exe and the .jar prog?
Is it to do with Windows 10 maybe? Still stuck!

Erel · Mar 3, 2016

1. Have you tried to run it as an admin?

2. Have you tried to install it to a different folder (c:\test)?

SimonElck · Mar 3, 2016

1. yes
2. I don't know how. The packager does not prompt me for it, nor does the installer(= the exe that the packager creates)
Instead I manually copied the directory to C:\chat (didn't work either) and then to E:\chat same result.

Erel · Mar 3, 2016

Can you upload the installation file (upload it to dropbox or a similar service)?

SimonElck · Mar 3, 2016

Le Voila:
https://drive.google.com/file/d/0B3BMyh__aPVwaHEtTkdZWlVlVEk/view?usp=sharing

Erel · Mar 4, 2016

Works fine here.

My guess is that it is related to the java version or to a permission problem.

SimonElck · Mar 4, 2016

Thanks for your troubles.
It's not the version, but must be something in Windows 10. I tried compatibility modes.
Would not be the first problem with W10 now would it
Thanks again

marco.canta · Mar 16, 2016

This library (Serial) also works with NON-UI apps?
I made an app UI that receives data from the serial and it all works.
Now I did the same app but NOT-UI version, but does not work.
With the logs I saw that the serial port is open and without errors, but the "NewData" event never comes.

B4X:

Sub AStream_NewData (Buffer() As Byte)
    Try   
        ValRX = BytesToString(Buffer, 0, Buffer.Length, "UTF8")
        Log(ValRX)
    Catch
        Log("ERROR - NewData")
    End Try
End Sub

Thanks Marco

Erel · Mar 16, 2016

marco.canta said:
This library (Serial) also works with NON-UI apps?

Yes. Make sure to call StartMessageLoop at the end of AppStart.

marco.canta · Mar 16, 2016

Thanks Erel.
I had forgotten "Start Message Loop".
Now it all works

Erel · Jun 23, 2016

v1.06 is available. It allows accessing the native jssc.SerialPort with JavaObject.

skeedsr · Jul 12, 2016

hi erel i try to use the chat, if i use with b4j consolle ( debug or release or offiscated) iys well, byt if i comile and run jar file the application stop.

if i takeoff 'sp.open("Com4") the app function , but as normal dont recieve message,

the serial port in my pc is emulated by a software emulator ( virtual serial port emulator) that function well, when i try with the consolle b4j all is well.

i try to start program with a bat file as administrator but nothing good..

thanks!!

livio

Erel · Jul 12, 2016

Please start a new thread for this question.

skeedsr · Jul 12, 2016

ok but i solved it was a problem of java version.. thanks!!

wcieslik · Nov 2, 2016

Hello,
Is it possible to get the status of the DCD line ? (eg like CTS and DSR) ?

Erel · Nov 2, 2016

Try this:

B4X:

Dim jo As JavaObject = serialport
Dim DCD As Boolean = jo.GetFieldJO("sp").RunMethod("isRLSD", Null)

wcieslik · Nov 3, 2016

Erel said:

Try this:

B4X:

Dim jo As JavaObject = serialport
Dim DCD As Boolean = jo.GetFieldJO("sp").RunMethod("isRLSD", Null)

Thanks Erel, I tried this this morning and the second line, (Dim DCD .... ), generates an exception w.r.t. the field "sp" not found anywhere ...
"java.lang.RuntimeException: Field: sp not found in: anywheresoftware.b4j.serial.Serial"

Is there a way to list/find all of the valid field names ?

Erel · Nov 3, 2016

Are you using jSerial v1.06: https://www.b4x.com/android/forum/threads/jserial-library.34762/ ?

wcieslik · Nov 3, 2016

Erel said:
Are you using jSerial v1.06: https://www.b4x.com/android/forum/threads/jserial-library.34762/ ?

Thanks Erel,
Appologies, I was using jSerial v1.05.

jSerial v1.06 works like a charm !

Thank you again.

B4J Library jSerial library

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