I am trying to add the pymodbus pacakge to the meta-python layer. I am not a Yocto expert but I am stumped on this error although I added the $ {PYTHON_PN}-six package. I would appreciate any help.

Pymodbus can be used without any third party dependencies (aside from pyserial) and is a very lightweight project. Pymodbus also provides a lot of ready to use examples as well as a server/client ...