B4J Library jSerial library

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

 

[KitCarlson]

Excellent! Just what I need.

 

[ellpopeb4a]

sorry where is it the serial lib in JShell.zip?

 

[Erel]

Fixed...

 

[ellpopeb4a]

Nice.. the CONNECTION works well
Thanks

 

[Chris_Moulding]

Hi,

Does the jserial library work with USB ports? I've searched for documentation on the jserial library but I've not found it yet.

Regards,

Chris

 

[Chris_Moulding]

I've just found the jerial documentation:

http://www.b4x.com/b4j/help/jserial.html

Regards,

Chris

 

[Erel]

jSerial library works with COM ports. If your USB device can map itself as a virtual COM port then you can use it with this library.

 

[kris_audi]

Hi,
How I can set param COM port (Even parity)?

Private sp As Serial
sp.Open("")
sp.SetParams(9600,8,1,?)

 

[marco.canta]

How I can set param COM port (NONE parity) ?

I use ... 2400, 8 ,none,1

where can I find an example to get data?
I need to receive data from Arduino


Thanks

 

[agraham]

PARITY_NONE = 0
PARITY_ODD = 1
PARITY_EVEN = 2
PARITY_MARK = 3
PARITY_SPACE = 4

Use AsyncStreams to send/receive data. Examples are in the first post.

 

[kris_audi]

Hi.

When I close the app I receive the mistake:

Program started.
jssc.SerialPortException: Port name - COM1; Method name - getInputBufferBytesCount(); Exception type - Port not opened.
at jssc.SerialPort.checkPortOpened(SerialPort.java:862)
at jssc.SerialPort.getInputBufferBytesCount(SerialPort.java:786)
at anywheresoftware.b4j.serial.Serial$1.read(Serial.java:110)
at anywheresoftware.b4j.serial.Serial$1.read(Serial.java:105)
at anywheresoftware.b4a.randomaccessfile.AsyncStreams$AIN.run(AsyncStreams.java:184)
at java.lang.Thread.run(Thread.java:722)
java.lang.RuntimeException: jssc.SerialPortException: Port name - COM1; Method name - getInputBufferBytesCount(); Exception type - Port not opened.
at anywheresoftware.b4j.serial.Serial$1.read(Serial.java:118)
at anywheresoftware.b4j.serial.Serial$1.read(Serial.java:105)
at anywheresoftware.b4a.randomaccessfile.AsyncStreams$AIN.run(AsyncStreams.java:184)
at java.lang.Thread.run(Thread.java:722)
Caused by: jssc.SerialPortException: Port name - COM1; Method name - getInputBufferBytesCount(); Exception type - Port not opened.
at jssc.SerialPort.checkPortOpened(SerialPort.java:862)
at jssc.SerialPort.getInputBufferBytesCount(SerialPort.java:786)
at anywheresoftware.b4j.serial.Serial$1.read(Serial.java:110)
... 3 more

 

[Erel]

You should close AsyncStreams in MainForm_Close event.

 

[kris_audi]

Hi.

I use astream.Close in MainForm_Close event and I receive the mistake:

Program started.
java.lang.InterruptedException: sleep interrupted
at java.lang.Thread.sleep(Native Method)
at anywheresoftware.b4j.serial.Serial$1.read(Serial.java:111)
at anywheresoftware.b4j.serial.Serial$1.read(Serial.java:105)
at anywheresoftware.b4a.randomaccessfile.AsyncStreams$AIN.run(AsyncStreams.java:184)
at java.lang.Thread.run(Thread.java:722)

 

[Erel]

Can you upload your project (File - Export as zip)?

 

[kris_audi]

Yes.

 

[Erel]

You should first close AsyncStream and then the serial port:

Sub btnClose_Action
   astream.Close
   sp.Close
   btnOpen.Enabled = True
   btnClose.Enabled = False
End Sub

 

[kris_audi]

I changed astream.Close and sp.Close in
btnClose_Action
but I have still mistake.

 

[Erel]

If you only see the InterruptedException message in the logs then you can ignore it.

 

[kris_audi]

Thank you Erel.