Using your Raspberry Pi with the Edge Microserver and Modbus

    If you plan on using your Raspberry Pi with the Edge Microserver to connect to a PLC with the Modbus protocol, then you need to follow the instructions here: https://community.thingworx.com/community/developers/blog/2015/12/13/modbus-plc-simulator

     

    But in addition to that also consider that:

     

    1. The modbusExample.lua tries to load file transfer functionality.

    2. There is something wrong with the supplied core.so file (maybe it was not compiled for ARM architecture) - you get No such file or directory

    [ERROR] when running the luaResource.

     

    To fix the 1st issue is easy... just remove the require "thingworx.shapes.filetransfer" line from modbusExample.lua.

     

    To fix the second issue you need to find a core.so file which is compatible with the ARM Architecture of your Raspberry Pi.  In theory, the core.os file supplied as part of the TWEMS MODBUS Package_Linux_ARM.zip file located at microserver/etc/community/clibs/socket/core.so should work, but it does not.

     

    Download the lua-socket resource:

    $ sudo apt-get install lua-socket

     

    Copy the new core.so to your microserver installation:

    $ cp /usr/lib/arm-linux-gnueabihf/lua/5.1/socket/core.so /home/pi/microserver/etc/community/clibs/socket/

     

    This should yield success.