Node Using YASDI

Using YASDI in SolarNode

SolarNode can make use of the SMA YASDI framework to communicate with SMA inverters. SolarNode provides a yasdi4j bundle (net.solarnetwork.external.jasdi4j) which uses JNI to access the yasdi dynamic library.

Unfortunately, the YASDI driver libraries will not load from the bundle (libyasdi calls dlopen) and must be installed in a location where the SolarNode process can find them.

This setup is not ideal... if anyone knows how to compile the driver libraries directly into YASDI, please chime in!

Getting yasdi libraries

The libyassdi-linux-i386.tgz archive included in the net.solarnetwork.external.jasdi4j/example directory contains the compiled shared libraries and the yasdishell program. Expand this into solar's home directory like

cd ~solar
tar xzf libyasdi-linux-i386.tgz

You can run yasdishell if you create a YASDI configuration file. For example create the file ~/conf/yasdi.ini with the following details:

[DriverModules]
Driver0=yasdi_drv_serial

[COM1]
Device=/dev/ttyS0
Media=RS485
Baudrate=1200
Protocol=SMANet

You can then run yasdishell like

yasdishell ~/conf/yasdi.ini

Local user install

To get YASDI loading using just the solar user's permissions, you can leave the YASDI shared libraries in ~solar/lib and modify the startup script to include

-Djava.library.path=${SOLARNODE_HOME}/lib

in the JVM_ARGS section. Then modify ~solar/.profile to include

export LD_LIBRARY_PATH=/home/solar/lib

Debian 7 system

You can install the yasdi libraries into /usr/lib/jni to make them accessible to SolarNode, and then you don't have to modify the startup scripts or shell profile.