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

jinyistudio · Dec 3, 2016

I have this problem too(std::bad_alloc).
I solved it with http://raspberrypi.stackexchange.co...ommunicate-through-ttyama0-on-raspbian-jessie

rdkartono said:
Hi Erel,

I just want to let you know, that the problem is solved. Followed this tutorial (http://www.hobbytronics.co.uk/raspberry-pi-serial-port), disable serial console, and its good now using standard Asyncstream class.

Regards,

Rudy.

red30 · Feb 28, 2017

Exchange is very slow - why? I connect microcontroller (USB CDC) to the android device (felUsbSerial library and USB) works fine. Rewrote the program on Windows, all the same only the exchange is very slow ... why?

Erel · Feb 28, 2017

Please start a new thread for this in the questions forum.

Erel · Mar 14, 2017

v1.10 is released. It improves the reading performance.

red30 · Apr 9, 2017

Can I work with this library by time out? T.m. I set the time (ex. 100 mls). When I get the first bit, I began to count time. When it is 100 mls, I transmete all that i have got.

Erel · Apr 9, 2017

Please start a new thread for this in the questions forum.

roberto64 · Jul 15, 2017

Hi, who can help me, send SMS with B4j by connecting cn usb to a smartphone, I saw an example on B4R but I do not understand how to convert it to B4J.
regards

Erel · Jul 16, 2017

You are not posting in the correct place. Always start a new thread for your questions.

roberto64 · Jul 23, 2017

Hi Erel, the example of the first post B4j_Chat and B4A_chat putting them running at BA_Chat, clicking on the connect button can not find the port to connect to B4J_chart, in a few words it does not dial between PCs and smartphones.
regards

Erel · Jul 23, 2017

The Android device must be mapped to a virtual com port first.

roberto64 · Jul 26, 2017

Hi, I'm looking for but in vain to connect with the B4J_Chat example with B4A_chat the two android devices with the pc, I also created the virtual serial port com virtual serial port but the two devices do not hook up, with B4A_chat when the button communicates to me That no device exists, on my device management as seen in the image the driver "SAMSUNG Mobile USB Composite Device" and "COM etc are the virtual ports" are where I am wrong or you can get help.
regards

Erel · Jul 26, 2017

You can try to use jBluetooth: https://www.b4x.com/android/forum/threads/jbluetooth-library.60184/
If it supports your Bluetooth module then it is better as it doesn't require configuration.

roberto64 · Jul 26, 2017

On my pc or Bluetooth, the only one and with ip addresses?
regards

roberto64 · Jul 26, 2017

If I connect to com5 from this error

B4X:

Waiting for debugger to connect...
Program started.
java.lang.RuntimeException: Message size too large. Prefix mode can only work if both sides of the connection follow the 'prefix' protocol.
    at anywheresoftware.b4a.randomaccessfile.AsyncStreams$AIN.run(AsyncStreams.java:214)
    at java.lang.Thread.run(Thread.java:748)
Error: (RuntimeException) java.lang.RuntimeException: Message size too large. Prefix mode can only work if both sides of the connection follow the 'prefix' protocol.
Connection is broken.

Erel · Jul 26, 2017

Please start a new thread for this in the questions forum.

rtek1000 · Jul 28, 2017

I'm starting to get interested in b4j, this example was the first application I came into contact with.

The example worked fine, but I do not know how to edit the graphical part, b4J's version 5.82 IDE shows "Scene Builder Layout (deprecated)"

So I set up a new layout in case a newbie is interested in editing the new BJL file instead of the old FXML file.

Erel · Dec 31, 2017

Please start a new thread for this question.

javiman6969 · Jul 8, 2018

I have this problem too (std::bad_alloc).
Raspberry PI 2 with a USB Dongle,

Bus 001 Device 004: ID 0451:16a6 Texas Instruments, Inc. BM-USBD1 BlueRobin RF heart rate sensor receiver

I have correctly open /dev/ttyACM0 but closing the port, the result is (std::bad_alloc).

I use the last verison of JSSC
Any suggestion?

Thanks!

PD.: I can not find version 1.06 of jSerial for download. I have the version 1.05

Erel · Jul 9, 2018

Please start a new thread for this.

Erel · Oct 2, 2019

v1.30 - Adds support for Java 11 and 64 bit computers based on: https://github.com/java-native/jssc

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