I wrote a simple program to blink an LED. Server and Client need the same value.I have a Universal Bit Whacker (UBW) that I bought from and I am having a bit of trouble communicating to it over the serial port (virtual serial port via USB). Also important to set the correct baud rate. Static final String COMPORT = '/dev/ttyUSB0' It's important to set the correct serial port path. The following example is very simple: Show/hide source-code There are some examples out there to create a small programm, which let you read from the serial interface. Now, everyhting is set up, in order to create the application. Add the RXTXcomm*.jar via the 'Add External JARs.'-button.Click on the project and hit 'Alt+Enter' to open the properties for the project.The '/usr/share/java'-folder should contain the '', otherwise search for 'RXTXcomm*.jar' to get the correct location: sudo find / -name 'RXTXcomm*.jar'Īfter knowing the correct location, the RXTXcomm*.jar needs a link in Eclipse: So the correct copy-command looks like this: sudo cp /usr/lib/jni/ /usr/lib/jvm/java-11-openjdk-amd64/lib/i386/librxtxSerial.so RXTX installation - Part 2/2 - Java Archive In this case '/usr/lib/jvm/java-11-openjdk-amd64/bin/java' or '/usr/lib/jvm/java-11-openjdk-amd64/' is the correct path. In order to get the correct 'JDK'-path, just run: whereis javaĪnd the output should look like this: java: /usr/bin/java /usr/share/java /usr/lib/jvm/java-11-openjdk-amd64/bin/java /usr/share/man/man1/java.1.gz This file needs to be copied into the JDK/lib/i386/-folder. This is the current version (), maybe it is another version in the future. These files get installed in: /usr/lib/jni/īecause only the serial interface is used in this case, there is only one file, which is needed: /usr/lib/jni/ so-files which must be recognized by Java. Just install the rxtx-package via apt: sudo apt-get install librxtx-java RXTX installation - Part 1/2 - shared object Of course there are more libaries available, like ' java-simple-serial-connector', but in my case 'RXTX' worked best with Ubuntu 18.04 and 'jSerialComm' worked best with Windows XP.

How To Install Eclipse Oxygen IDE On Ubuntu 16.04 | 17.10 | 18.04 (FYI: This site also explaines how to install a JDK.)įor the last 'component' are two libraries available:

A suitable library for reading from/writing on the serial interfaceįor the frist two 'components' are a lot of tutorials and how-tos avaialbe like these: How To Install Java with `apt` on Ubuntu 18.04 (FYI: the 'JDK' - Java Development Kit - is needed.).

One way, which I want to describe here, is to read process the data in Java.įor this part, thre components are needed: Serial Communication with Palm OS - Part 3/4 On Ubuntu 18.04 and JavaĪfter having a Palm-OS-Application which is able to send some data via the serial interface and reading them from a commandline on Ubuntu 18.04, it would be also nice to have a - maybe - better environment to take control of.

Java rxtx serial port example